WO2013161372A1 - 添加剤を含むケイ素含有euvレジスト下層膜形成組成物 - Google Patents
添加剤を含むケイ素含有euvレジスト下層膜形成組成物 Download PDFInfo
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- WO2013161372A1 WO2013161372A1 PCT/JP2013/054535 JP2013054535W WO2013161372A1 WO 2013161372 A1 WO2013161372 A1 WO 2013161372A1 JP 2013054535 W JP2013054535 W JP 2013054535W WO 2013161372 A1 WO2013161372 A1 WO 2013161372A1
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- Prior art keywords
- resist
- underlayer film
- propylene glycol
- resist underlayer
- group
- Prior art date
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- NBNZEBUNZGWIRJ-UHFFFAOYSA-N triphenylsulfanium;nitrate Chemical compound [O-][N+]([O-])=O.C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 NBNZEBUNZGWIRJ-UHFFFAOYSA-N 0.000 description 1
- WLOQLWBIJZDHET-UHFFFAOYSA-N triphenylsulfonium Chemical compound C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 WLOQLWBIJZDHET-UHFFFAOYSA-N 0.000 description 1
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- FAYMLNNRGCYLSR-UHFFFAOYSA-M triphenylsulfonium triflate Chemical compound [O-]S(=O)(=O)C(F)(F)F.C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 FAYMLNNRGCYLSR-UHFFFAOYSA-M 0.000 description 1
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Classifications
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
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- C08K5/544—Silicon-containing compounds containing nitrogen
- C08K5/5455—Silicon-containing compounds containing nitrogen containing at least one group
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K5/548—Silicon-containing compounds containing sulfur
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
- C09D183/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
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- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
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- G03F7/0751—Silicon-containing compounds used as adhesion-promoting additives or as means to improve adhesion
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- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
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- G03F7/0752—Silicon-containing compounds in non photosensitive layers or as additives, e.g. for dry lithography
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- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/091—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers characterised by antireflection means or light filtering or absorbing means, e.g. anti-halation, contrast enhancement
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- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
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- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/094—Multilayer resist systems, e.g. planarising layers
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
- H01L21/3081—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their composition, e.g. multilayer masks, materials
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
- H01L21/3083—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/3086—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane characterised by the process involved to create the mask, e.g. lift-off masks, sidewalls, or to modify the mask, e.g. pre-treatment, post-treatment
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
- C08G77/26—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen nitrogen-containing groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G77/04—Polysiloxanes
- C08G77/38—Polysiloxanes modified by chemical after-treatment
- C08G77/382—Polysiloxanes modified by chemical after-treatment containing atoms other than carbon, hydrogen, oxygen or silicon
- C08G77/388—Polysiloxanes modified by chemical after-treatment containing atoms other than carbon, hydrogen, oxygen or silicon containing nitrogen
Definitions
- the present invention relates to a composition for forming a lower layer film between a substrate used for manufacturing a semiconductor device and a resist (for example, EUV resist). More specifically, the present invention relates to a resist underlayer film forming composition for lithography for forming an underlayer film used as a lower layer of a resist in a lithography process of manufacturing a semiconductor device. The present invention also relates to a method for forming a resist pattern using the underlayer film forming composition.
- microfabrication is obtained by forming a thin film of photoresist on a semiconductor substrate such as a silicon wafer, irradiating it with an actinic ray such as ultraviolet rays through a mask pattern on which a semiconductor device pattern is drawn, and developing it.
- actinic ray such as ultraviolet rays
- fine irregularities corresponding to the pattern are formed on the substrate surface by etching the substrate using the photoresist pattern as a protective film.
- a film known as a hard mask containing a metal element such as silicon is used as a lower layer film between the semiconductor substrate and the photoresist.
- the rate of removal by dry etching largely depends on the type of gas used for dry etching.
- the gas type it is possible to remove the hard mask by dry etching without a significant decrease in the thickness of the photoresist.
- a resist underlayer film has been arranged between a semiconductor substrate and a photoresist (see Patent Documents 1 and 2). ).
- An object of the present invention is to provide a resist underlayer film forming composition for EUV lithography which can be used for manufacturing a semiconductor device, which enables fine substrate processing using a rectangular resist pattern. Specifically, it is to provide a resist underlayer film forming composition for lithography for forming a resist underlayer film that can be used as a hard mask. Further, a resist underlayer film for lithography and an underlayer film for lithography, which has a higher dry etching rate than that of a resist without causing an improvement in exposure sensitivity of the EUV resist and intermixing with the resist, and generates less outgas when exposed to EUV light. It is providing the resist underlayer film forming composition for forming.
- the present invention provides a hydrolyzable polysiloxane (A) containing a hydrolyzable condensate of hydrolyzable silane (a) and a sulfonamide structure, a carboxylic acid amide structure, a urea structure, or an isocyanuric acid structure.
- a resist underlayer film forming composition for EUV lithography comprising a silane compound (b),
- a polysiloxane containing a hydrolysis condensate of a hydrolyzable silane (a) and a hydrolyzable silane compound (b) having a sulfonamide structure, a carboxylic acid amide structure, a urea structure, or an isocyanuric acid structure B
- the hydrolyzable silane (a) is at least one hydrolyzable silane selected from the group consisting of tetraalkoxysilane, alkyltrialkoxysilane, and aryltrialkoxysilane.
- the hydrolyzable silane compound (b) is represented by the following general formula (b-1): (In the above formula (b-1), R 4 represents an alkoxy group having 1 to 10 carbon atoms, R 1 represents an alkylene group having 1 to 10 carbon atoms, R 2 represents the following sulfonamide structure, carboxylic acid amide Structure, urea structure, or isocyanuric acid structure Represents R 3 represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a fluoroalkyl group having 1 to 10 carbon atoms,
- composition for forming a resist underlayer film which is a silane compound represented by:
- the polysiloxane (A) is obtained by co-hydrolyzing and condensing alkyltrialkoxysilane 10 to 35 mol and aryltrialkoxysilane 2 to 25 mol with respect to 70 mol of tetraalkoxysilane.
- the resist underlayer film forming composition according to any one of the first aspect and the third to sixth aspects As an eighth aspect, the resist underlayer film forming composition according to any one of the first aspect to the seventh aspect, further including an acid compound, As a ninth aspect, the resist underlayer film forming composition according to any one of the first to eighth aspects, further containing water, As a tenth aspect, the resist underlayer film forming composition according to any one of the first aspect to the ninth aspect, further including an ammonium compound, a cyclic ammonium compound, a cyclic amine compound, or a sulfonium compound, As an eleventh aspect, a resist underlayer film obtained by applying and baking the resist underlayer film forming composition according to any one of the first to tenth aspects on a semiconductor substrate, As a twelfth aspect, a step of applying the resist underlayer film forming composition according to any one of the first aspect to the tenth aspect on a semiconductor substrate and baking to form a resist underlayer film, A step of applying a resist
- the resist underlayer film forming composition of the present invention contains a hydrolyzable silane hydrolysis condensate, that is, a polyorganosiloxane structure
- the resist underlayer film formed from the composition comprises a substrate and a substrate thereon. It has sufficient etching resistance against the oxygen-based dry etching gas used for etching the organic underlayer film to be formed, and thus can function as a hard mask and an antireflection film in the manufacture of semiconductor devices.
- the resist underlayer film forming composition of the present invention is a balance of the amount of acid generated by the hydrolyzable silane compound having the above specific structure from the photoacid generator present at the interface between the EUV resist film and the underlayer film.
- the resist underlayer film forming composition of the present invention can improve the adhesion between the resist underlayer film formed from the composition and the resist film by including the hydrolyzable silane compound, and the hydrolyzable Since the silane compound has a hydrolyzable group and can be incorporated into the polyorganosiloxane structure, it has an effect of suppressing outgas generation.
- a resist underlayer film is formed on a substrate by a coating method, or a resist underlayer film is formed thereon by an organic underlayer film on a substrate, and a resist film (for example, , EUV resist). Then, a resist pattern is formed by exposure and development, and the resist underlayer film is dry-etched using the resist pattern to transfer the pattern, and the substrate is processed by the pattern, or the organic underlayer film is etched by pattern transfer. Then, the substrate is processed with the organic underlayer film. In forming a fine pattern, the resist film thickness tends to be thin in order to prevent pattern collapse.
- a resist film for example, EUV resist
- the resist underlayer film (containing an inorganic silicon compound) is coated on the substrate with or without an organic underlayer film on the substrate, and a resist film (organic resist film) is formed thereon. It is coated in the order of.
- the organic component film and the inorganic component film differ greatly in the dry etching rate depending on the selection of the etching gas.
- the organic component film has an oxygen-based gas and the dry etching rate increases.
- the inorganic component film has a halogen-containing gas. This increases the dry etching rate.
- a resist pattern is formed, and the resist underlayer film of the present application existing under the resist pattern is dry-etched with a halogen-containing gas to transfer the pattern to the resist underlayer film, and the halogen-containing gas is transferred with the pattern transferred to the resist underlayer film.
- the organic underlayer film under the layer is dry-etched with an oxygen-based gas to transfer the pattern to the organic underlayer film, and the pattern-transferred organic underlayer film is halogen-containing.
- Substrate processing is performed using gas.
- the resist underlayer film functions as a hard mask.
- Hydrolyzable groups such as alkoxy groups, acyloxy groups, and halogen groups in the structure are hydrolyzed or partially hydrolyzed, and then a silanol group condensation reaction is performed.
- a polymer having a polysiloxane structure This polyorganosiloxane structure has a sufficient function as a hard mask.
- the polyorganosiloxane structure (intermediate film) is effective as a hard mask for etching the underlying organic underlayer film and processing (etching) the substrate. That is, it has sufficient dry etching resistance against oxygen dry etching gas of the organic underlayer film during substrate processing.
- the silane compound used together with the polysiloxane in the present invention can make the resist shape rectangular in the lithography of EUV resist. This is because when the acid generated from the photoacid generator contained in the EUV resist is present at the interface between the EUV resist and the lower layer film, the bottom of the resist pattern tends to be undercut, and further, the interface between the EUV resist and the lower layer film.
- the addition of the above silane compound is intended to improve by neutralizing (quenching) or supplying the acid present at the interface. Therefore, the silane compound to be added is preferably a compound that can be converted into a base by decomposition by light, or a compound that can trap an acid by basicity or hydrogen bonding of the silane compound itself.
- the silane compound to be added is preferably a compound capable of generating secondary electrons and acid by light. In this way, it is possible to adjust the acid balance at the interface by adding the silane compound. These silane compounds are also effective in improving the adhesion to the resist. And since a silane compound has a hydrolysable group, since the silanol group couple
- the present invention relates to a polysiloxane (A) containing a hydrolyzable condensate of hydrolyzable silane (a) and a hydrolyzable silane compound (b) having a sulfonamide structure, a carboxylic acid amide structure, a urea structure, or an isocyanuric acid structure. And a resist underlayer film forming composition for EUV lithography.
- the present invention also provides a polysiloxane comprising a hydrolyzable condensate of a hydrolyzable silane (a) and a hydrolyzable silane compound (b) having a sulfonamide structure, a carboxylic acid amide structure, a urea structure, or an isocyanuric acid structure. It is a resist underlayer film forming composition for EUV lithography containing (B).
- the hydrolyzed condensate is polysiloxane, but when the hydrolyzed condensate is obtained, the hydrolyzed product, the partially hydrolyzed product or the silane compound that is not completely hydrolyzed is mixed with the hydrolyzed condensate. Mixtures can also be used.
- the resist underlayer film forming composition of this invention contains the said polysiloxane (A) or polysiloxane (B), and also contains a solvent.
- a solvent As optional components, acid, water, alcohol, curing catalyst, acid generator, other organic polymer, light-absorbing compound, surfactant and the like can be included.
- the solid content in the resist underlayer film forming composition of the present invention is, for example, 0.1 to 50% by mass, or 0.1 to 30% by mass, and 0.1 to 25% by mass. Here, the solid content is obtained by removing the solvent component from all the components of the resist underlayer film forming composition.
- the proportion of polysiloxane (A) or polysiloxane (B) in the solid content is 20% by mass or more, for example, 50 to 99.999% by mass, or 60 to 99.99% by mass, or 70 to 99.%. 5% by mass.
- the hydrolyzable silane compound (b) is 0.001 to 15% by mass, or 0.01 to 15% by mass, or 1 to 15% by mass, or 5 to 10% by mass with respect to the polysiloxane (A). % Can be added.
- the polysiloxane (A) used in the present invention is a hydrolysis condensate of a hydrolyzable silane (a), and the hydrolyzable silane (a) is formed from tetraalkoxysilane, alkyltrialkoxysilane, and aryltrialkoxysilane. It is a cohydrolyzed condensate of the hydrolyzable silane selected.
- the polysiloxane (A) is preferably a cohydrolysis condensate of tetraalkoxysilane, alkyltrialkoxysilane, and aryltrialkoxysilane.
- Tetraalkoxysilane is a silane compound such as tetramethoxysilane, tetraethoxysilane, tetraisopropoxysilane, or tetrabutoxysilane.
- the alkyl group of the alkyltrialkoxysilane is a linear or branched alkyl group having 1 to 10 carbon atoms, such as a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, i-butyl, s-butyl, t-butyl, n-pentyl, 1-methyl-n-butyl, 2-methyl-n-butyl, 3-methyl-n-butyl, 1,1 -Dimethyl-n-propyl group, 1,2-dimethyl-n-propyl group, 2,2-dimethyl-n-propyl group, 1-ethyl-n-propyl group, n-hexyl group, 1-methyl-n- Pentyl group, 2-methyl-n-pentyl group, 3-methyl-n-pentyl group, 4-methyl-n-pentyl group, 1,1-dimethyl-n-but
- a cyclic alkyl group can also be used.
- a cyclic alkyl group having 1 to 10 carbon atoms a cyclopropyl group, a cyclobutyl group, a 1-methyl-cyclopropyl group, a 2-methyl-cyclopropyl group, a cyclopentyl group, 1-methyl-cyclobutyl group, 2-methyl-cyclobutyl group, 3-methyl-cyclobutyl group, 1,2-dimethyl-cyclopropyl group, 2,3-dimethyl-cyclopropyl group, 1-ethyl-cyclopropyl group, 2 -Ethyl-cyclopropyl group, cyclohexyl group, 1-methyl-cyclopentyl group, 2-methyl-cyclopentyl group, 3-methyl-cyclopentyl group, 1-ethyl-cyclobutyl group, 2-ethyl-cyclobutyl group, 3-ethyl-cyclobutyl Group, 1,2-d
- Examples of the aryl group of the aryltrialkoxysilane include a substituted or unsubstituted phenyl group and a naphthyl group.
- a phenyl group is particularly preferable.
- the substituent include halogen atoms such as fluorine atom, chlorine atom, bromine atom and iodine atom, alkoxy groups such as methoxy group, ethoxy group, n-propoxy group and i-propoxy group, methoxymethoxy group, ethoxyethoxy group, Examples thereof include alkoxyalkoxy groups such as methoxyethoxy group and ethoxymethoxy group.
- the hydrolyzable group include a methoxy group, an ethoxy group, an isopropoxy group, and a butoxy group.
- X represents a hydrolyzable group such as a methoxy group, an ethoxy group, an isopropoxy group, or a butoxy group.
- the polysiloxane (A) is a product obtained by cohydrolyzing and condensing alkyltrialkoxysilane 10 to 35 mol and aryltrialkoxysilane in an amount of 0 to 25 mol with respect to 70 mol of tetraalkoxysilane.
- the polysiloxane (A) is a product obtained by co-hydrolyzing and condensing 10 to 35 mol of alkyltrialkoxysilane and 2 to 25 mol of aryltrialkoxysilane with respect to 70 mol of tetraalkoxysilane. preferable. Specific examples of the polysiloxane (A) can be exemplified below.
- hydrolyzable condensate of the hydrolyzable silane (a) (polysiloxane (A))
- a condensate having a weight average molecular weight of 1,000 to 1,000,000 or 1,000 to 100,000 can be obtained. These molecular weights are molecular weights obtained in terms of polystyrene by GPC analysis.
- GPC measurement conditions include, for example, a GPC apparatus (trade name HLC-8220GPC, manufactured by Tosoh Corporation), a GPC column (trade names Shodex KF803L, KF802, KF801, Showa Denko), column temperature of 40 ° C., eluent (elution solvent) Is tetrahydrofuran, the flow rate (flow rate) is 1.0 ml / min, and the standard sample is polystyrene (made by Showa Denko KK).
- a GPC apparatus trade name HLC-8220GPC, manufactured by Tosoh Corporation
- GPC column trade names Shodex KF803L, KF802, KF801, Showa Denko
- column temperature 40 ° C.
- eluent elution solvent
- Is tetrahydrofuran the flow rate (flow rate) is 1.0 ml / min
- the standard sample is polystyrene (made by Showa Denko KK
- hydrolysis catalyst can be used per mol of hydrolyzable group.
- the reaction temperature at the time of hydrolysis and condensation is usually 20 to 90 ° C.
- Hydrolysis may be performed completely or partially. That is, a hydrolyzate or a monomer may remain in the hydrolysis condensate.
- a catalyst can be used in the hydrolysis and condensation.
- hydrolysis catalyst examples include metal chelate compounds, organic acids, inorganic acids, organic bases, and inorganic bases.
- Metal chelate compounds as hydrolysis catalysts include, for example, triethoxy mono (acetylacetonato) titanium, tri-n-propoxy mono (acetylacetonato) titanium, tri-i-propoxy mono (acetylacetonato) titanium, tri -N-Butoxy mono (acetylacetonato) titanium, tri-sec-butoxy mono (acetylacetonato) titanium, tri-t-butoxy mono (acetylacetonato) titanium, diethoxy bis (acetylacetonato) titanium , Di-n-propoxy bis (acetylacetonato) titanium, di-i-propoxy bis (acetylacetonato) titanium, di-n-butoxy bis (acetylacetonato) titanium, di-sec-butoxy bis (Acetylacetonate) Titanium, Di-t
- Organic acids as hydrolysis catalysts are, for example, acetic acid, propionic acid, butanoic acid, pentanoic acid, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, oxalic acid, maleic acid, methylmalonic acid, adipic acid, sebacin Acid, gallic acid, butyric acid, meritic acid, arachidonic acid, mikimic acid, 2-ethylhexanoic acid, oleic acid, stearic acid, linoleic acid, linolenic acid, salicylic acid, benzoic acid, p-aminobenzoic acid, p-toluenesulfonic acid Benzenesulfonic acid, monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, trifluoroacetic acid, formic acid, malonic acid, sulfonic acid
- Examples of the inorganic acid as the hydrolysis catalyst include hydrochloric acid, nitric acid, sulfuric acid, hydrofluoric acid, and phosphoric acid.
- Organic bases as hydrolysis catalysts are, for example, pyridine, pyrrole, piperazine, pyrrolidine, piperidine, picoline, trimethylamine, triethylamine, monoethanolamine, diethanolamine, dimethylmonoethanolamine, monomethyldiethanolamine, triethanolamine, diazabicyclooctane, dia Examples include zabicyclononane, diazabicycloundecene, and tetramethylammonium hydroxide.
- inorganic base examples include ammonia, sodium hydroxide, potassium hydroxide, barium hydroxide, calcium hydroxide and the like.
- metal chelate compounds, organic acids, and inorganic acids are preferred, and these may be used alone or in combination of two or more.
- organic solvent used in the hydrolysis examples include n-pentane, i-pentane, n-hexane, i-hexane, n-heptane, i-heptane, 2,2,4-trimethylpentane, n-octane, i- Aliphatic hydrocarbon solvents such as octane, cyclohexane and methylcyclohexane; benzene, toluene, xylene, ethylbenzene, trimethylbenzene, methylethylbenzene, n-propyl benzene, i-propyl benzene, diethylbenzene, i-butylbenzene, triethylbenzene, di -Aromatic hydrocarbon solvents such as i-propyl benzene, n-amyl naphthalene, trimethylbenzene; methanol, ethanol, ethanol
- acetone methyl ethyl ketone, methyl-n-propyl ketone, methyl-n-butyl ketone, diethyl ketone, methyl-i-butyl ketone, methyl-n-pentyl ketone, ethyl-n-butyl ketone, methyl-n-hexyl ketone, di- Ketone solvents such as i-butyl ketone, trimethylnonanone, cyclohexanone, methylcyclohexanone, 2,4-pentanedione, acetonylacetone, diacetone alcohol, acetophenone, fenchon (1,1,3-trimethyl-2-norbornene) Is preferable from the viewpoint of storage stability of the solution.
- Hydrolyzable organosilane is hydrolyzed and condensed in a solvent using a catalyst, and the resulting hydrolyzed condensate (polymer) simultaneously removes by-product alcohol, used hydrolysis catalyst, and water by distillation under reduced pressure. can do.
- the acid and base catalyst used for hydrolysis can be removed by neutralization or ion exchange.
- the resist underlayer film forming composition for lithography of the present invention the resist underlayer film forming composition containing the hydrolysis condensate is added with an acid (for example, an organic acid), water, alcohol, or a combination thereof for stabilization. can do.
- organic acid examples include oxalic acid, malonic acid, methylmalonic acid, succinic acid, maleic acid, malic acid, tartaric acid, phthalic acid, citric acid, glutaric acid, citric acid, lactic acid, and salicylic acid. Of these, oxalic acid and maleic acid are preferred.
- the organic acid to be added is 0.5 to 5.0 parts by mass with respect to 100 parts by mass of the condensate (polyorganosiloxane). Further, pure water, ultrapure water, ion exchange water, or the like can be used as the water to be added, and the amount added can be 1 to 20 parts by mass with respect to 100 parts by mass of the resist underlayer film forming composition.
- alcohol to add what is easy to be scattered by the heating after application
- coating is preferable, for example, methanol, ethanol, propanol, isopropanol, a butanol etc. are mentioned.
- the added alcohol can be 1 to 20 parts by mass with respect to 100 parts by mass of the resist underlayer film forming composition.
- a hydrolyzable silane compound (b) having a sulfonamide structure, a carboxylic acid amide structure, a urea structure, or an isocyanuric acid structure can be added.
- the hydrolyzable silane (b) can be represented by the general formula (b-1).
- R 4 represents an alkoxy group having 1 to 10 carbon atoms such as a methoxy group, an ethoxy group, an isopropoxy group, or a butoxy group.
- R 1 represents an alkylene group having 1 to 10 carbon atoms, and examples thereof include a methylene group, an ethylene group, a propylene group, and a butylene group.
- R 2 represents the sulfonamide structure, carboxylic acid amide structure, urea structure, or isocyanuric acid structure shown above.
- R 3 represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a fluoroalkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an aryl group having 6 to 20 carbon atoms. Examples of the alkyl group having 1 to 10 carbon atoms include a methyl group, an ethyl group, a propyl group, and an isopropyl group.
- the alkenyl group having 2 to 10 carbon atoms includes ethenyl group, 1-propenyl group, 2-propenyl group, 1-methyl-1-ethenyl group, 1-butenyl group, 2-butenyl group, 3-butenyl group, 2- Examples thereof include a methyl-1-propenyl group, a 2-methyl-2-propenyl group, a 1-ethylethenyl group, and a 1-methyl-1-propenyl group.
- a 2-propenyl group that is, an allyl group
- fluoroalkyl group having 1 to 10 carbon atoms examples include a perfluoromethyl group, a perfluoroethyl group, a perfluoropropyl group, and a perfluorobutyl group.
- aryl group having 6 to 20 carbon atoms examples include an optionally substituted phenyl group and naphthyl group.
- hydrolyzable silane (b) can be exemplified below.
- the present invention also provides a polysiloxane comprising a hydrolyzable condensate of a hydrolyzable silane (a) and a hydrolyzable silane compound (b) having a sulfonamide structure, a carboxylic acid amide structure, a urea structure, or an isocyanuric acid structure.
- a hydrolyzable condensate (polysiloxane (B)) of hydrolyzable silane (a) and hydrolyzable silane (b) can give a condensate having a weight average molecular weight of 1,000 to 1,000,000, or 1,000 to 100,000.
- GPC measurement conditions include, for example, a GPC apparatus (trade name HLC-8220GPC, manufactured by Tosoh Corporation), a GPC column (trade names Shodex KF803L, KF802, KF801, Showa Denko), column temperature of 40 ° C., eluent (elution solvent) Is tetrahydrofuran, the flow rate (flow rate) is 1.0 ml / min, and the standard sample is polystyrene (made by Showa Denko KK).
- the method for producing the hydrolysis-condensation product can be performed as described above.
- a crosslinkable compound can be contained.
- cross-linkable compounds having at least two cross-linking substituents are preferably used.
- examples thereof include melamine compounds and substituted urea compounds having a cross-linking substituent such as a methylol group or a methoxymethyl group.
- it is a compound such as methoxymethylated glycoluril or methoxymethylated melamine, for example, tetramethoxymethylglycoluril, tetrabutoxymethylglycoluril, or hexamethoxymethylmelamine.
- compounds such as tetramethoxymethylurea and tetrabutoxymethylurea are also included.
- the solid content is, for example, 50% by mass or less, 0.01 to 50% by mass, or 10 to 40% by mass.
- the resist underlayer film forming composition of the present invention can contain an acid compound.
- the acid compound include sulfonic acid compounds such as p-toluenesulfonic acid, trifluoromethanesulfonic acid, and pyridinium-p-toluenesulfonate, and carboxylic acids such as salicylic acid, sulfosalicylic acid, citric acid, benzoic acid, and hydroxybenzoic acid.
- sulfonic acid compounds such as p-toluenesulfonic acid, trifluoromethanesulfonic acid, and pyridinium-p-toluenesulfonate
- carboxylic acids such as salicylic acid, sulfosalicylic acid, citric acid, benzoic acid, and hydroxybenzoic acid.
- a compound can be mentioned.
- Examples of the acid compound include 2,4,4,6-tetrabromocyclohexadienone, benzoin tosylate, 2-nitrobenzyl tosylate, p-trifluoromethylbenzenesulfonic acid-2,4-dinitrobenzyl,
- Examples include acid generators that generate an acid by heat or light, such as phenyl-bis (trichloromethyl) -s-triazine and N-hydroxysuccinimide trifluoromethanesulfonate.
- the acid compound examples include iodonium salt acid generators such as diphenyliodonium hexafluorophosphate, diphenyliodonium trifluoromethanesulfonate, and bis (4-tert-butylphenyl) iodonium trifluoromethanesulfonate, and triphenylsulfonium hexafluoroantimony And sulfonium salt acid generators such as triphenylsulfonium trifluoromethanesulfonate.
- a sulfonic acid compound, an iodonium salt acid generator, and a sulfonium salt acid generator are preferably used.
- An acid compound may use only 1 type and can be used in combination of 2 or more type.
- the content of the acid compound is, for example, 0.1 to 10% by mass or 0.1 to 5% by mass in the solid content.
- the resist underlayer film forming composition of the present invention can contain a curing catalyst.
- the curing catalyst functions as a curing catalyst when a coating film containing polyorganosiloxane composed of a hydrolysis condensate is heated and cured.
- an ammonium salt, a cyclic ammonium compound, a cyclic amine compound, or a sulfonium compound can be used as the curing catalyst.
- the curing catalyst is 0.01 to 10 parts by mass, or 0.01 to 5 parts by mass, or 0.01 to 3 parts by mass with respect to 100 parts by mass of the polyorganosiloxane.
- rheology modifier examples include phthalic acid compounds such as dimethyl phthalate, diethyl phthalate, diisobutyl phthalate, dihexyl phthalate, butyl isodecyl phthalate, adipic acid such as dinormal butyl adipate, diisobutyl adipate, diisooctyl adipate, octyl decyl adipate Compounds, maleic acid compounds such as dinormal butyl maleate, diethyl maleate, dinonyl maleate, oleic acid compounds such as methyl oleate, butyl oleate, tetrahydrofurfuryl oleate, and stearic acid compounds such as normal butyl stearate, glyceryl stearate Can be mentioned.
- the amount used is, for example, 0.001 to 10% by mass in the solid content.
- surfactant examples include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether, polyoxyethylene alkyl ethers such as polyoxyethylene oleyl ether, polyoxyethylene octyl phenol ether, polyoxyethylene, and the like.
- Polyoxyethylene alkyl allyl ethers such as nonylphenol ether, polyoxyethylene / polyoxypropylene block copolymers, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate, sorbitan trioleate Sorbitan fatty acid esters such as stearate, polyoxyethylene sorbitan monolaurate, polyoxyethylene Nonionic surfactants such as polyoxyethylene sorbitan fatty acid esters such as rubitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan trioleate, polyoxyethylene sorbitan tristearate, trade name EFTOP EF301 , EF303, EF352 (manufactured by Tochem Products Co., Ltd.), trade names MegaFuck F171, F173, R-08, R-30 (manufactured by Dainippon Ink & Chemicals, Inc.
- any solvent can be used as long as it can dissolve the solid content.
- solvents include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, methyl cellosolve acetate, ethyl cellosolve acetate, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol, propylene glycol monomethyl ether, propylene glycol monoethyl ether.
- the resist underlayer film forming composition of the present invention is coated on a semiconductor substrate (for example, a silicon / silicon dioxide coated substrate, a silicon nitride substrate, a glass substrate, an ITO substrate, etc.) by an appropriate coating method such as a spinner or a coater. Then, a resist underlayer film is formed by baking.
- the conditions for firing are appropriately selected from firing temperatures of 80 ° C. to 250 ° C. and firing times of 0.3 to 60 minutes.
- the firing temperature is 130 ° C. to 250 ° C.
- the firing time is 0.5 to 5 minutes.
- the thickness of the resist underlayer film to be formed is, for example, 0.01 to 3.0 ⁇ m, preferably 0.01 to 1.0 ⁇ m, or 0.01 to 0.5 ⁇ m, for example. Or 0.01 to 0.05 ⁇ m.
- a layer of a high energy ray resist such as an EUV resist is formed on the resist underlayer film. Formation of the layer of the high energy beam resist can be performed by a well-known method, that is, coating and baking of the high energy beam resist composition solution on the lower layer film.
- the EUV resist for example, a resist composition using a resin such as PMMA (polymethyl methacrylate), polyhydroxystyrene, or phenol resin can be used.
- exposure is performed through a predetermined mask.
- EUV light (13.5 nm), electron beam, X-ray or the like can be used.
- post-exposure heating PEB: Post Exposure Bake
- the post-exposure heating is appropriately selected from a heating temperature of 70 ° C. to 150 ° C. and a heating time of 0.3 to 10 minutes.
- Developers include aqueous solutions of alkali metal hydroxides such as potassium hydroxide and sodium hydroxide, aqueous solutions of quaternary ammonium hydroxides such as tetramethylammonium hydroxide, tetraethylammonium hydroxide and choline, ethanolamine, propylamine, An alkaline aqueous solution such as an aqueous amine solution such as ethylenediamine can be mentioned as an example. Further, a surfactant or the like can be added to these developers.
- the development conditions are appropriately selected from a temperature of 5 to 50 ° C. and a time of 10 to 300 seconds.
- the resist can be developed using an organic solvent as a developer.
- an organic solvent as a developer.
- the developer for example, methyl acetate, butyl acetate, ethyl acetate, isopropyl acetate, amyl acetate, isoamyl acetate, ethyl methoxyacetate, ethyl ethoxy acetate, propylene glycol monomethyl ether, ethylene glycol monoethyl ether acetate, ethylene glycol monopropyl ether Acetate, ethylene glycol monobutyl ether acetate, ethylene glycol monophenyl ether acetate, diethylene glycol monomethyl ether acetate, diethylene glycol monopropyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monopheny
- the resist underlayer film is removed and the semiconductor substrate is processed.
- Removal of the resist underlayer film includes tetrafluoromethane, perfluorocyclobutane (C 4 F 8 ), perfluoropropane (C 3 F 8 ), trifluoromethane, carbon monoxide, argon, oxygen, nitrogen, sulfur hexafluoride, difluoro It is carried out using a gas such as methane, nitrogen trifluoride and chlorine trifluoride.
- a planarizing film, a gap fill material layer, or an organic underlayer film can be formed. When a semiconductor substrate having a large step or a hole is used, it is preferable that a planarizing film or a gap fill material layer is formed.
- reaction solution is cooled to room temperature, 42.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and ethanol, methanol, acetone, water and hydrochloric acid as reaction byproducts are distilled off under reduced pressure, and concentrated to hydrolytic condensation.
- a product (polymer) propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponded to Formula (1-1), and the weight average molecular weight by GPC was Mw 1100 in terms of polystyrene.
- Synthesis example 2 Tetraethoxysilane 15.21 g (70 mol%), methyltriethoxysilane 4.65 g (25 mol%), phenyltrimethoxysilane 1.03 g (5 mol%), and acetone 31.33 g were placed in a 300 ml flask, and the mixed solution was dissolved in magnet. While stirring with a tic stirrer, 6.95 g of 0.01 mol / l hydrochloric acid was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, 42.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and ethanol, methanol, acetone, water and hydrochloric acid as reaction byproducts are distilled off under reduced pressure, and concentrated to hydrolytic condensation.
- a product (polymer) propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponded to Formula (1-1), and the weight average molecular weight by GPC was Mw 1300 in terms of polystyrene.
- Synthesis example 3 11.11 g (70 mol%) of tetramethoxysilane, 3.55 g (25 mol%) of methyltrimethoxysilane, 1.03 g (5 mol%) of phenyltrimethoxysilane, and 23.55 g of acetone were placed in a 300 ml flask, and the mixed solution was added to a magnetic flask. While stirring with a tic stirrer, 6.95 g of 0.01 mol / l hydrochloric acid was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, 32.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure and concentrated to obtain a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponded to Formula (1-1), and the weight average molecular weight by GPC was Mw 1300 in terms of polystyrene.
- Synthesis example 4 11.11 g (70 mol%) of tetramethoxysilane, 2.84 g (20 mol%) of methyltrimethoxysilane, 2.38 g (10 mol%) of 4-methoxyphenyltrimethoxysilane, and 24.50 g of acetone were placed in a 300 ml flask and mixed. While stirring the solution with a magnetic stirrer, 6.95 g of 0.01 mol / l hydrochloric acid was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, 32.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure and concentrated to obtain a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponded to Formula (1-2), and the weight average molecular weight by GPC was Mw 1200 in terms of polystyrene.
- Synthesis example 5 11.11 g (70 mol%) of tetramethoxysilane, 4.26 g (30 mol%) of methyltrimethoxysilane and 23.06 g of acetone were put into a 300 ml flask, and the mixed solution was stirred at 0.01 mol / l with a magnetic stirrer. Of hydrochloric acid was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, 30.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure and concentrated to obtain a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponded to Formula (1-9), and the weight average molecular weight by GPC was Mw 1300 in terms of polystyrene.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product ( Polymer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponded to Formula (B-1), and the weight average molecular weight by GPC was Mw2000 in terms of polystyrene.
- Synthesis example 7 300 ml of 23.34 g (70 mol%) of tetraethoxysilane, 5.71 g (20 mol%) of triethoxymethylsilane, 6.68 g of heptafluoro-N- (3- (triethoxysilyl) propyl) butanamide and 53.60 g of acetone
- the flask was put into a flask, and 10.67 g of 0.01 mol / l hydrochloric acid was added dropwise to the mixed solution while stirring the mixed solution with a magnetic stirrer. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponded to Formula (B-2), and the weight average molecular weight by GPC was Mw2000 in terms of polystyrene.
- Synthesis example 8 A flask containing 24.81 g (70 mol%) of tetraethoxysilane, 7.58 g (25 mol%) of triethoxymethylsilane, 3.08 g of N- (3- (triethoxysilyl) propyl) benzenesulfonamide and 53.20 g of acetone in a 300 ml flask Then, 11.34 g of 0.01 mol / l hydrochloric acid was added dropwise to the mixed solution while stirring the mixed solution with a magnetic stirrer. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product ( Polymer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponded to Formula (B-3), and the weight average molecular weight by GPC was Mw2000 in terms of polystyrene.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product ( Polymer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponded to Formula (B-4), and the weight average molecular weight by GPC was Mw2000 in terms of polystyrene.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (B-5), and the weight average molecular weight by GPC was Mw 2000 in terms of polystyrene.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (B-6), and the weight average molecular weight by GPC was Mw 2000 in terms of polystyrene.
- Synthesis Example 12 23.95 g (70 mol%) of tetraethoxysilane, 5.86 g (20 mol%) of triethoxymethylsilane, 5.82 g of the monomer of the formula (b-1-8) and 53.43 g of acetone were put into a 300 ml flask, and the mixed solution was added. While stirring with a magnetic stirrer, 10.94 g of 0.01 mol / l hydrochloric acid was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (B-7), and the weight average molecular weight by GPC was Mw 2000 in terms of polystyrene.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponded to a formula (B-8), and the weight average molecular weight by GPC was Mw2000 in polystyrene conversion.
- Synthesis Example 14 24.46 g (70 mol%) of tetraethoxysilane, 5.98 g (20 mol%) of triethoxymethylsilane, 5.09 g of the monomer of the formula (b-1-10) and 53.29 g of acetone were put into a 300 ml flask, and the mixed solution was added. While stirring with a magnetic stirrer, 11.18 g of 0.01 mol / l hydrochloric acid was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (B-9), and the weight average molecular weight by GPC was Mw 2000 in terms of polystyrene.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (B-10), and the weight average molecular weight by GPC was Mw 2000 in terms of polystyrene.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponded to a formula (B-11), and the weight average molecular weight by GPC was Mw2000 in polystyrene conversion.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product ( Polymer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponded to Formula (B-1), and the weight average molecular weight by GPC was Mw2000 in terms of polystyrene.
- Synthesis Example 18 Tetraethoxysilane (21.37 g, 70 mol%), triethoxymethylsilane (2.61 g, 10 mol%), 3- (triethoxysilyl) propyldiallyl isocyanurate (12.12 g), and acetone (54.14 g) were placed in a 300 ml flask and mixed. While stirring the solution with a magnetic stirrer, 9.76 g of 0.01 mol / l hydrochloric acid was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (B-6), and the weight average molecular weight by GPC was Mw 2000 in terms of polystyrene.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (B-7), and the weight average molecular weight by GPC was Mw 2000 in terms of polystyrene.
- Synthesis Example 20 23.24 g (70 mol%) of tetraethoxysilane, 2.84 g (10 mol%) of triethoxymethylsilane, 9.67 g of the monomer of the formula (b-1-10) and 53.63 g of acetone were placed in a 300 ml flask, and the mixed solution was added. While stirring with a magnetic stirrer, 10.62 g of 0.01 mol / l hydrochloric acid was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (B-9), and the weight average molecular weight by GPC was Mw 2000 in terms of polystyrene.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (B-12), and the weight average molecular weight by GPC was Mw 2000 in terms of polystyrene.
- Synthesis Example 23 19.67 g (70 mol%) of tetraethoxysilane, 16.73 g of 3- (triethoxysilyl) propyldiallyl isocyanurate, and 54.61 g of acetone were placed in a 300 ml flask, and the mixed solution was stirred with a magnetic stirrer while stirring with a magnetic stirrer. 8.99 g of 01 mol / l hydrochloric acid was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (B-13), and the weight average molecular weight by GPC was Mw 2000 in terms of polystyrene.
- Synthesis Example 24 Tetraethoxysilane (20.92 g, 70 mol%), formula (b-1-8) monomer (15.26 g) and acetone (54.26 g) were placed in a 300 ml flask, and the mixed solution was stirred with a magnetic stirrer to 0.01 mol / 9.56 g of 1 hydrochloric acid was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (B-14), and the weight average molecular weight by GPC was Mw 2000 in terms of polystyrene.
- Synthesis Example 25 Tetraethoxysilane (22.14 g, 70 mol%), formula (b-1-10) monomer (13.82 g), and acetone (53.93 g) were placed in a 300 ml flask, and the mixed solution was stirred with a magnetic stirrer while being 0.01 mol / l of hydrochloric acid (10.12 g) was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (B-14-2), and the weight average molecular weight by GPC was Mw 2000 in terms of polystyrene.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponded to a formula (B-15), and the weight average molecular weight by GPC was Mw2000 in polystyrene conversion.
- Synthesis Example 27 25.59 g (70 mol%) of tetraethoxysilane, 6.26 g of triethoxymethylsilane, 3.48 g of phenyltrimethoxysilane, and 52.98 g of acetone were placed in a 300 ml flask, and the mixed solution was stirred with a magnetic stirrer while stirring. .01 mol / l hydrochloric acid 11.69 g was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product ( Polymer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponded to Formula (1-1), and the weight average molecular weight by GPC was Mw 2000 in terms of polystyrene.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product ( Polymer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the weight average molecular weight by GPC of the obtained polymer was Mw2000 in terms of polystyrene.
- MA for maleic acid
- BTEAC for benzyltriethylammonium chloride
- IMIDTEOS for N- (3-triethoxysilylpropyl) -4,5-dihydroimidazole
- TPSCl triphenylsulfonium chloride
- monotriphenylsulfonium maleate Is abbreviated as TPSMA
- PGMEA propylene glycol monomethyl ether acetate
- PGEE propylene glycol monoethyl ether
- PGME propylene glycol monomethyl ether
- N- (3- (triethoxysilyl) propyl) butyramide is AmideTEOS
- heptafluoro-N- (3- (triethoxysilyl) propyl) butanamide is FamideTEOS
- Propyl) benzenesulfonamide is BSA
- N- (3- (triethoxysilyl) propyl) propanesulfonamide is PrSA
- 1- (3- (trimethoxysilyl) propyl) urea is UreaTMOS
- 1-propyl-3- ( 3- (trimethoxysilyl) propyl) urea was abbreviated as Prurea TMOS
- 3- (triethoxysilyl) propyl diallyl isocyanurate was abbreviated as DAICATEOS. Water used was ultrapure water. Each addition amount was shown in parts by mass.
- the resist underlayer is obtained by mixing the silicon-containing polymer, acid, curing catalyst, other additives, solvent, and water obtained in the above synthesis example in the proportions shown in Table 1 and filtering through a 0.1 ⁇ m fluororesin filter. Each solution of the film forming composition was prepared.
- the addition ratio of the polymer in Table 1 indicates not the addition amount of the polymer solution but the addition amount of the polymer itself.
- Organic underlayer film (A1 layer) (Organic underlayer film (A1 layer)) CNp-PM manufactured by Maruzen Petrochemical Co., Ltd. (in terms of molar ratio of vinyl naphthalene 60%: hydroxystyrene 40%, weight average molecular weight: 6000) was used as the organic underlayer film (A1 layer).
- the evaluation result at the time of using the thin film by the thin film formation composition of this invention as a resist underlayer film is shown below. (Optical constant measurement)
- the resist underlayer film forming compositions prepared in Example 1-14 and Comparative Example 1-5 were applied onto a silicon wafer using a spinner. Heating was performed at 240 ° C.
- resist underlayer film thickness 0.05 ⁇ m
- resist underlayer films were then analyzed using a spectroscopic ellipsometer (JA Woollam, VUV-VASE VU-302), with a refractive index (n value) and an optical extinction coefficient (k value, 193 nm, 248 nm). Also called attenuation coefficient).
- the organic underlayer film (A1 layer) forming composition was applied on a silicon wafer and baked on a hot plate at 240 ° C. for 60 seconds to obtain an organic underlayer film (A1 layer) having a thickness of 90 nm. Further, the resist underlayer film forming composition solution prepared in Example 1-14 and Comparative Example 1-5 of the present invention was spin-coated and heated at 240 ° C. for 1 minute, whereby the resist underlayer film (B) A layer (20 nm) is formed. On the hard mask, an EUV resist solution (methacrylate resin resist) is spin-coated and heated to form an EUV resist layer (C) layer.
- EUV resist solution methacrylate resin resist
- PEB was performed, cooled to room temperature on a cooling plate, developed with an alkaline aqueous solution (2.38 mass% aqueous solution of tetramethylammonium hydroxide) and rinsed to form a resist pattern.
- the evaluation evaluated whether or not a 26 nm line and space could be formed and the pattern shape by pattern cross-sectional observation.
- Carbazole (6.69 g, 0.040 mol, manufactured by Tokyo Chemical Industry Co., Ltd.), 9-fluorenone (7.28 g, 0.040 mol, manufactured by Tokyo Chemical Industry Co., Ltd.), paratoluene in a 100 mL four-necked flask under nitrogen.
- Sulfonic acid monohydrate (0.76 g, 0.0040 mol, manufactured by Tokyo Chemical Industry Co., Ltd.) was added, and 1,4-dioxane (6.69 g, manufactured by Kanto Chemical Co., Inc.) was added and stirred, and 100 ° C. The temperature was raised to dissolution and polymerization was started.
- the organic underlayer film (A2 layer) forming composition was formed on a silicon wafer using a spinner (film thickness 0.20 ⁇ m), and the dry etching rate was measured using O 2 gas as an etching gas. Then, the dry etching rates of the Si-containing resist underlayer films of Examples 15 to 40 and Comparative Example 6 were compared.
- Table 5 shows the etching rate (etching rate: nm / min) and oxygen-based gas (O 2 gas) resistance with fluorine-based gas (CF 4 gas), (resist underlayer film of the present application) / (organic underlayer film A2 layer). It is shown as an etch rate ratio.
- the organic underlayer film (A2 layer) forming composition was applied onto a silicon wafer and baked on a hot plate at 240 ° C. for 60 seconds to obtain an organic underlayer film (A2 layer) having a thickness of 90 nm.
- the resist underlayer film forming composition solution prepared in Examples 15 to 40 of the present invention and Comparative Example 6 was spin-coated, and heated at 240 ° C. for 1 minute, whereby the resist underlayer film (B) layer ( 20 nm) is formed.
- An EUV resist solution (methacrylate resin resist) is spin-coated on the hard mask and heated to form an EUV resist layer (C) layer.
- Tetramethoxysilane 21.62 g (70 mol%), methyltrimethoxysilane 4.15 g (15 mol%), triethoxysilylpropyldiallyl isocyanurate 4.20 g (5 mol%), [4- (methoxymethoxy) phenyl] trimethoxysilane 4.63 g (10 mol%) and 51.89 g of acetone were placed in a 300 ml flask, and 13.52 g of 0.01 mol / l hydrochloric acid was added dropwise to the mixed solution while stirring the mixed solution with a magnetic stirrer. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C. and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure and concentrated to obtain a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (B-16), and the weight average molecular weight by GPC was Mw 2000 in terms of polystyrene.
- Synthesis Example 30 Tetramethoxysilane (21.12 g, 70 mol%), methyltrimethoxysilane (5.40 g, 20 mol%), triethoxysilylpropyl diallyl isocyanurate (8.20 g), and acetone (52.08 g) were placed in a 300 ml flask, and the mixed solution was magnetic. While stirring with a stirrer, 13.21 g of 0.01 mol / l hydrochloric acid was added dropwise to the mixed solution. After the addition, the flask was transferred to an oil bath adjusted to 85 ° C., and reacted for 240 minutes under heating and reflux.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product (Polmer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the obtained polymer corresponds to the formula (B-6), and the weight average molecular weight by GPC was Mw 2000 in terms of polystyrene.
- reaction solution is cooled to room temperature, and 68.00 g of propylene glycol monomethyl ether acetate is added to the reaction solution, and methanol, acetone, water and hydrochloric acid as reaction by-products are distilled off under reduced pressure, and concentrated to a hydrolysis-condensation product ( Polymer)
- a propylene glycol monomethyl ether acetate solution was obtained.
- Propylene glycol monoethyl ether was added, and the solvent ratio of propylene glycol monomethyl ether acetate / propylene glycol monoethyl ether 20/80 was adjusted to 20 weight percent in terms of solid residue at 140 ° C.
- the weight average molecular weight by GPC of the obtained polymer was Mw2000 in terms of polystyrene.
- the organic underlayer film (A3 layer) formation composition was formed on a silicon wafer using a spinner (film thickness 0.20 ⁇ m), and the dry etching rate was measured using O 2 gas as the etching gas.
- the dry etching rates of the Si-containing resist underlayer films of Examples 41 to 49 and Comparative Example 7 were compared.
- Table 8 shows the etching rate (etching rate: nm / min) and oxygen-based gas (O 2 gas) resistance with fluorine-based gas (CF 4 gas), (resist underlayer film of this application) / (organic underlayer film A3 layer). It is shown as an etch rate ratio.
- the organic underlayer film (A3 layer) forming composition was applied onto a silicon wafer and baked on a hot plate at 240 ° C. for 60 seconds to obtain an organic underlayer film (A3 layer) having a thickness of 90 nm.
- a resist underlayer film forming composition solution prepared in Examples 41 to 49 and Comparative Example 7 of the present invention was spin-coated thereon, and heated at 240 ° C. for 1 minute, whereby a resist underlayer film (B) layer ( 20 nm) is formed.
- an EUV resist solution NTD resist manufactured by FFEM
- C EUV resist layer
- the thin film forming composition of the present invention can be used for a resist underlayer film forming composition such as a photoresist, a resist underlayer film forming composition such as an EUV resist, an EUV resist upper layer film forming composition, a reverse material forming composition, and the like. .
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Abstract
Description
これまで以上にプロファイル(レジスト形状)の制御や基板との密着性の向上が必要とされる。
そして、これまでもレジスト下層膜用の組成物の検討が行なわれてきているが、その要求される特性の多様性などから、レジスト下層膜用の新たな材料の開発が望まれている。
第2観点として、加水分解性シラン(a)と、スルホンアミド構造、カルボン酸アミド構造、ウレア構造、又はイソシアヌル酸構造を有する加水分解性シラン化合物(b)との加水分解縮合物を含むポリシロキサン(B)とを含むEUVリソグラフィー用レジスト下層膜形成組成物、
第3観点として、加水分解性シラン(a)が、テトラアルコキシシラン、アルキルトリアルコキシシラン及びアリールトリアルコキシシランからなる群から選ばれる少なくとも1種の加水分解性シランである第1観点又は第2観点に記載のレジスト下層膜形成組成物、
第4観点として、上記アルキルトリアルコキシシランがメチルトリアルコキシシランである第3観点に記載のレジスト下層膜形成組成物、
第5観点として、上記アリールトリアルコキシシランがフェニルトリアルコキシシランである第3観点又は第4観点に記載のレジスト下層膜形成組成物、
第6観点として、上記加水分解性シラン化合物(b)が下記一般式(b-1):
R3は水素原子、炭素原子数1~10のアルキル基、炭素原子数1~10のフルオロアルキル基、炭素原子数2~10のアルケニル基、又は炭素原子数6~20のアリール基を表す。)で表されるシラン化合物である第1観点乃至第5観点いずれか一つに記載のレジスト下層膜形成組成物、
第7観点として、上記ポリシロキサン(A)は、テトラアルコキシシラン70モルに対して、アルキルトリアルコキシシラン10~35モル、アリールトリアルコキシシランが2~25モルの割合で共加水分解し縮合したものである第1観点及び第3観点乃至第6観点のいずれか一つに記載のレジスト下層膜形成組成物、
第8観点として、更に酸化合物を含む第1観点乃至第7観点のいずれか一つに記載のレジスト下層膜形成組成物、
第9観点として、更に水を含む第1観点乃至第8観点のいずれか一つに記載のレジスト下層膜形成組成物、
第10観点として、更にアンモニウム化合物、環状アンモニウム化合物、環状アミン化合物、又はスルホニウム化合物を含む第1観点乃至第9観点のいずれか一つに記載のレジスト下層膜形成組成物、
第11観点として、第1観点乃至第10観点のいずれか一つに記載のレジスト下層膜形成組成物を半導体基板上に塗布し焼成することによって得られるレジスト下層膜、
第12観点として、第1観点乃至第10観点のいずれか一つに記載のレジスト下層膜形成組成物を半導体基板上に塗布し、焼成してレジスト下層膜を形成する工程、前記レジスト下層膜の上にレジスト用組成物を塗布し、レジスト膜を形成する工程、前記レジスト膜を露光する工程、露光後にレジスト膜を現像しパターン化されたレジスト膜を得る工程、パターン化されたレジスト膜によりレジスト下層膜をエッチングする工程、及びパターン化されたレジスト膜及びレジスト下層膜により半導体基板を加工する工程を含む半導体装置の製造方法、
第13観点として、半導体基板上に有機下層膜を形成する工程、その上に第1観点乃至第10観点のいずれか一つに記載のレジスト下層膜形成組成物を塗布し、焼成してレジスト下層膜を形成する工程、前記レジスト下層膜の上にレジスト用組成物を塗布し、レジスト膜を形成する工程、前記レジスト膜を露光する工程、露光後にレジストを現像し、パターン化されたレジスト膜を得る工程、パターン化されたレジスト膜によりレジスト下層膜をエッチングする工程、パターン化されたレジスト下層膜により有機下層膜をエッチングする工程、及びパターン化された有機下層膜により半導体基板を加工する工程を含む半導体装置の製造方法、及び
第14観点として、現像がアルカリ水溶液又は有機溶剤によって行われる第12観点又は第13観点に記載の製造方法である。
また、本発明のレジスト下層膜形成組成物は、上記特定の構造を有する加水分解性シラン化合物が、EUVレジスト膜と下層膜との界面に存在する光酸発生剤から発生する酸の量のバランスを調整し得るものであることから、該酸によるレジストパターンの形状不良を抑制し得る。
また、本発明のレジスト下層膜形成組成物は、該加水分解性シラン化合物を含むことにより該組成物から形成されたレジスト下層膜とレジスト膜との密着性が向上でき、そして、該加水分解性シラン化合物は加水分解性の基を有することによりポリオルガノシロキサン構造に組み込まれ得ることから、アウトガス発生を抑制する効果を奏する。
微細なパターンを形成する上で、パターン倒れを防ぐためにレジスト膜厚が薄くなる傾向がある。レジストの薄膜化によりその下層に存在する膜にパターンを転写するためのドライエッチングは、上層の膜よりもエッチング速度が高くなければパターン転写ができない。本発明では基板上に有機下層膜を介するか、又は有機下層膜を介さず、その上に本願レジスト下層膜(無機系シリコン系化合物含有)を被覆し、その上にレジスト膜(有機レジスト膜)の順で被覆される。有機系成分の膜と無機系成分の膜はエッチングガスの選択によりドライエッチング速度が大きく異なり、有機系成分の膜は酸素系ガスでドライエッチング速度が高くなり、無機系成分の膜はハロゲン含有ガスでドライエッチング速度が高くなる。
例えばレジストパターンが形成され、その下層に存在している本願レジスト下層膜をハロゲン含有ガスでドライエッチングしてレジスト下層膜にパターンを転写し、そのレジスト下層膜に転写されたパターンでハロゲン含有ガスを用いて基板加工を行う。あるいは、パターン転写されたレジスト下層膜を用いて、その下層の有機下層膜を酸素系ガスでドライエッチングして有機下層膜にパターン転写を行って、そのパターン転写された有機下層膜で、ハロゲン含有ガスを用いて基板加工を行う。
本発明では当該レジスト下層膜がハードマスクとして機能するものであり、構造中のアルコキシ基やアシロキシ基、ハロゲン基等の加水分解性基は加水分解乃至部分加水分解し、その後にシラノール基の縮合反応によりポリシロキサン構造のポリマーを形成する。このポリオルガノシロキサン構造はハードマスクとしての十分な機能を有している。
そして、ポリオルガノシロキサン構造(中間膜)は、その下に存在する有機下層膜のエッチングや、基板の加工(エッチング)にハードマスクとして有効である。即ち、基板加工時や有機下層膜の酸素系ドライエッチングガスに対して十分な耐ドライエッチング性を有するものである。
本発明にポリシロキサンと共に用いられるシラン化合物はEUVレジストのリソグラフィーにおいて、レジスト形状を矩形にすることができる。これはEUVレジストに含まれる光酸発生剤から発生する酸が、EUVレジストと下層膜との界面に存在するとレジストパターンの底部がアンダーカットになる傾向があり、更にEUVレジストと下層膜との界面に酸が不足するとフッティングになる、本発明では上記シラン化合物の添加により、界面に存在する酸を中和(クエンチング)、又は供給することで改善しようとするものである。従って、上記の添加されるシラン化合物は光による分解で塩基になるものや、シラン化合物自身の塩基性や水素結合による酸のトラップが可能な化合物が好ましい。また、添加されるシラン化合物は光による二次電子の発生や酸の発生が可能な化合物が好ましい。この様にシラン化合物の添加により界面での酸のバランスを調製することが可能である。
また、これらシラン化合物はレジストとの密着性改善にも効果がある。
そして、シラン化合物は加水分解性基を有しているので、そのシラノール基はポリシロキサンと結合し、ポリシロキサンに組み込まれることが可能であるため、露光時のアウトガス発生を抑制する効果もある。
また、本発明は加水分解性シラン(a)と、スルホンアミド構造、カルボン酸アミド構造、ウレア構造、又はイソシアヌル酸構造を有する加水分解性シラン化合物(b)との加水分解縮合物を含むポリシロキサン(B)とを含むEUVリソグラフィー用レジスト下層膜形成組成物である。
上記加水分解縮合物はポリシロキサンであるが、加水分解縮合物を得る際に加水分解が完全に完了しない加水分解物や部分加水分解物やシラン化合物が加水分解縮合物に混合されているような混合物を用いることもできる。
本発明のレジスト下層膜形成組成物は、上記ポリシロキサン(A)又はポリシロキサン(B)を含み、更に溶剤を含む。そして任意成分として酸、水、アルコール、硬化触媒、酸発生剤、他の有機ポリマー、吸光性化合物、及び界面活性剤等を含むことができる。
本発明のレジスト下層膜形成組成物における固形分は、例えば0.1~50質量%、又は0.1~30質量%、0.1~25質量%である。ここで固形分とはレジスト下層膜形成組成物の全成分から溶剤成分を除いたものである。
固形分中に占めるポリシロキサン(A)又はポリシロキサン(B)の割合は、20質量%以上であり、例えば50~99.999質量%、又は60~99.99質量%、又は70~99.5質量%である。
また、加水分解性シラン化合物(b)は、ポリシロキサン(A)に対して、0.001~15質量%、又は0.01~15質量%、又は1~15質量%、又は5~10質量%の範囲で添加することができる。
テトラアルコキシシランは、テトラメトキシシラン、テトラエトキシシラン、テトライソプロポキシシラン、テトラブトキシシラン等のシラン化合物である。
特にメチル基が好ましく用いられる。また、加水分解基はメトキシ基、エトキシ基、イソプロポキシ基、ブトキシ基等が挙げられる。
また、加水分解基はメトキシ基、エトキシ基、イソプロポキシ基、ブトキシ基等が挙げられる。
また、ポリシロキサン(A)は、テトラアルコキシシラン70モルに対して、アルキルトリアルコキシシラン10~35モル、アリールトリアルコキシシランが2~25モルの割合で共加水分解し縮合したものであることが好ましい。
ポリシロキサン(A)の具体例は以下に例示することができる。
GPCの測定条件は、例えばGPC装置(商品名HLC-8220GPC、東ソー株式会社製)、GPCカラム(商品名ShodexKF803L、KF802、KF801、昭和電工製)、カラム温度は40℃、溶離液(溶出溶媒)はテトラヒドロフラン、流量(流速)は1.0ml/min、標準試料はポリスチレン(昭和電工株式会社製)を用いて行うことができる。
加水分解性基の加水分解には、加水分解性基の1モル当たり、0.5~100モル、好ましくは1~10モルの水を用いる。
また、加水分解性基の1モル当たり0.001~10モル、好ましくは0.001~1モルの加水分解触媒を用いることができる。
加水分解と縮合を行う際の反応温度は、通常20~90℃である。
加水分解は完全に加水分解を行うことも、部分加水分解することでも良い。即ち、加水分解縮合物中に加水分解物やモノマーが残存していても良い。
加水分解し縮合させる際に触媒を用いることができる。
加水分解触媒としての金属キレート化合物は、例えばトリエトキシ・モノ(アセチルアセトナート)チタン、トリ-n-プロポキシ・モノ(アセチルアセトナート)チタン、トリ-i-プロポキシ・モノ(アセチルアセトナート)チタン、トリ-n-ブトキシ・モノ(アセチルアセトナート)チタン、トリ-sec-ブトキシ・モノ(アセチルアセトナート)チタン、トリ-t-ブトキシ・モノ(アセチルアセトナート)チタン、ジエトキシ・ビス(アセチルアセトナート)チタン、ジ-n-プロポキシ・ビス(アセチルアセトナート)チタン、ジ-i-プロポキシ・ビス(アセチルアセトナート)チタン、ジ-n-ブトキシ・ビス(アセチルアセトナート)チタン、ジ-sec-ブトキシ・ビス(アセチルアセトナート)チタン、ジ-t-ブトキシ・ビス(アセチルアセトナート)チタン、モノエトキシ・トリス(アセチルアセトナート)チタン、モノ-n-プロポキシ・トリス(アセチルアセトナート)チタン、モノ-i-プロポキシ・トリス(アセチルアセトナート)チタン、モノ-n-ブトキシ・トリス(アセチルアセトナート)チタン、モノ-sec-ブトキシ・トリス(アセチルアセトナート)チタン、モノ-t-ブトキシ・トリス(アセチルアセトナート)チタン、テトラキス(アセチルアセトナート)チタン、トリエトキシ・モノ(エチルアセトアセテート)チタン、トリ-n-プロポキシ・モノ(エチルアセトアセテート)チタン、トリ-i-プロポキシ・モノ(エチルアセトアセテート)チタン、トリ-n-ブトキシ・モノ(エチルアセトアセテート)チタン、トリ-sec-ブトキシ・モノ(エチルアセトアセテート)チタン、トリ-t-ブトキシ・モノ(エチルアセトアセテート)チタン、ジエトキシ・ビス(エチルアセトアセテート)チタン、ジ-n-プロポキシ・ビス(エチルアセトアセテート)チタン、ジ-i-プロポキシ・ビス(エチルアセトアセテート)チタン、ジ-n-ブトキシ・ビス(エチルアセトアセテート)チタン、ジ-sec-ブトキシ・ビス(エチルアセトアセテート)チタン、ジ-t-ブトキシ・ビス(エチルアセトアセテート)チタン、モノエトキシ・トリス(エチルアセトアセテート)チタン、モノ-n-プロポキシ・トリス(エチルアセトアセテート)チタン、モノ-i-プロポキシ・トリス(エチルアセトアセテート)チタン、モノ-n-ブトキシ・トリス(エチルアセトアセテート)チタン、モノ-sec-ブトキシ・トリス(エチルアセトアセテート)チタン、モノ-t-ブトキシ・トリス(エチルアセトアセテート)チタン、テトラキス(エチルアセトアセテート)チタン、モノ(アセチルアセトナート)トリス(エチルアセトアセテート)チタン、ビス(アセチルアセトナート)ビス(エチルアセトアセテート)チタン、トリス(アセチルアセトナート)モノ(エチルアセトアセテート)チタン、等のチタンキレート化合物;トリエトキシ・モノ(アセチルアセトナート)ジルコニウム、トリ-n-プロポキシ・モノ(アセチルアセトナート)ジルコニウム、トリ-i-プロポキシ・モノ(アセチルアセトナート)ジルコニウム、トリ-n-ブトキシ・モノ(アセチルアセトナート)ジルコニウム、トリ-sec-ブトキシ・モノ(アセチルアセトナート)ジルコニウム、トリ-t-ブトキシ・モノ(アセチルアセトナート)ジルコニウム、ジエトキシ・ビス(アセチルアセトナート)ジルコニウム、ジ-n-プロポキシ・ビス(アセチルアセトナート)ジルコニウム、ジ-i-プロポキシ・ビス(アセチルアセトナート)ジルコニウム、ジ-n-ブトキシ・ビス(アセチルアセトナート)ジルコニウム、ジ-sec-ブトキシ・ビス(アセチルアセトナート)ジルコニウム、ジ-t-ブトキシ・ビス(アセチルアセトナート)ジルコニウム、モノエトキシ・トリス(アセチルアセトナート)ジルコニウム、モノ-n-プロポキシ・トリス(アセチルアセトナート)ジルコニウム、モノ-i-プロポキシ・トリス(アセチルアセトナート)ジルコニウム、モノ-n-ブトキシ・トリス(アセチルアセトナート)ジルコニウム、モノ-sec-ブトキシ・トリス(アセチルアセトナート)ジルコニウム、モノ-t-ブトキシ・トリス(アセチルアセトナート)ジルコニウム、テトラキス(アセチルアセトナート)ジルコニウム、トリエトキシ・モノ(エチルアセトアセテート)ジルコニウム、トリ-n-プロポキシ・モノ(エチルアセトアセテート)ジルコニウム、トリ-i-プロポキシ・モノ(エチルアセトアセテート)ジルコニウム、トリ-n-ブトキシ・モノ(エチルアセトアセテート)ジルコニウム、トリ-sec-ブトキシ・モノ(エチルアセトアセテート)ジルコニウム、トリ-t-ブトキシ・モノ(エチルアセトアセテート)ジルコニウム、ジエトキシ・ビス(エチルアセトアセテート)ジルコニウム、ジ-n-プロポキシ・ビス(エチルアセトアセテート)ジルコニウム、ジ-i-プロポキシ・ビス(エチルアセトアセテート)ジルコニウム、ジ-n-ブトキシ・ビス(エチルアセトアセテート)ジルコニウム、ジ-sec-ブトキシ・ビス(エチルアセトアセテート)ジルコニウム、ジ-t-ブトキシ・ビス(エチルアセトアセテート)ジルコニウム、モノエトキシ・トリス(エチルアセトアセテート)ジルコニウム、モノ-n-プロポキシ・トリス(エチルアセトアセテート)ジルコニウム、モノ-i-プロポキシ・トリス(エチルアセトアセテート)ジルコニウム、モノ-n-ブトキシ・トリス(エチルアセトアセテート)ジルコニウム、モノ-sec-ブトキシ・トリス(エチルアセトアセテート)ジルコニウム、モノ-t-ブトキシ・トリス(エチルアセトアセテート)ジルコニウム、テトラキス(エチルアセトアセテート)ジルコニウム、モノ(アセチルアセトナート)トリス(エチルアセトアセテート)ジルコニウム、ビス(アセチルアセトナート)ビス(エチルアセトアセテート)ジルコニウム、トリス(アセチルアセトナート)モノ(エチルアセトアセテート)ジルコニウム、等のジルコニウムキレート化合物;トリス(アセチルアセトナート)アルミニウム、トリス(エチルアセトアセテート)アルミニウム等のアルミニウムキレート化合物;などを挙げることができる。
加水分解触媒としての無機酸は、例えば塩酸、硝酸、硫酸、フッ酸、リン酸等を挙げることができる。
加水分解触媒としての有機塩基は、例えばピリジン、ピロール、ピペラジン、ピロリジン、ピペリジン、ピコリン、トリメチルアミン、トリエチルアミン、モノエタノールアミン、ジエタノールアミン、ジメチルモノエタノールアミン、モノメチルジエタノールアミン、トリエタノールアミン、ジアザビシクロオクタン、ジアザビシクロノナン、ジアザビシクロウンデセン、テトラメチルアンモニウムハイドロオキサイド等を挙げることができる。無機塩基としては、例えばアンモニア、水酸化ナトリウム、水酸化カリウム、水酸化バリウム、水酸化カルシウム等を挙げることができる。これら触媒の内、金属キレート化合物、有機酸、無機酸が好ましく、これらは1種あるいは2種以上を同時に使用しても良い。
上記有機酸としては、例えばシュウ酸、マロン酸、メチルマロン酸、コハク酸、マレイン酸、リンゴ酸、酒石酸、フタル酸、クエン酸、グルタル酸、クエン酸、乳酸、サリチル酸等が挙げられる。中でも、シュウ酸、マレイン酸等が好ましい。加える有機酸は縮合物(ポリオルガノシロキサン)100質量部に対して0.5~5.0質量部である。また加える水は純水、超純水、イオン交換水等を用いることができ、その添加量はレジスト下層膜形成組成物100質量部に対して1~20質量部とすることができる。
また加えるアルコールとしては塗布後の加熱により飛散しやすいものが好ましく、例えばメタノール、エタノール、プロパノール、イソプロパノール、ブタノール等が挙げられる。加えるアルコールはレジスト下層膜形成組成物100質量部に対して1~20質量部とすることができる。
上記加水分解性シラン(b)は、一般式(b-1)で表すことができる。
上記式(b-1)において、R4はメトキシ基、エトキシ基、イソプロポキシ基、ブトキシ基等の炭素原子数1~10のアルコキシ基を表す。R1は炭素原子数1~10のアルキレン基を表し、例えばメチレン基、エチレン基、プロピレン基、ブチレン基等が挙げられる。R2は上述に示すスルホンアミド構造、カルボン酸アミド構造、ウレア構造、又はイソシアヌル酸構造を表す。
R3は水素原子、炭素原子数1~10のアルキル基、炭素原子数1~10のフルオロアルキル基、炭素原子数2~10のアルケニル基、又は炭素原子数6~20のアリール基を表す。炭素原子数1~10のアルキル基としては例えば、メチル基、エチル基、プロピル基、イソプロピル基等が挙げられる。炭素原子数2~10のアルケニル基は、エテニル基、1-プロペニル基、2-プロペニル基、1-メチル-1-エテニル基、1-ブテニル基、2-ブテニル基、3-ブテニル基、2-メチル-1-プロペニル基、2-メチル-2-プロペニル基、1-エチルエテニル基、1-メチル-1-プロペニル基等が挙げられる。特に2-プロペニル基(即ち、アリル基)が好ましく用いることができる。炭素原子数1~10のフルオロアルキル基としてはパーフルオロメチル基、パーフルオロエチル基、パーフルオロプロピル基、パーフルオロブチル基等が挙げられる。炭素原子数6~20のアリール基としては置換されていても良いフェニル基、ナフチル基等が挙げられる。
加水分解性シラン(a)と加水分解性シラン(b)の加水分解縮合物(ポリシロキサン(B))は重量平均分子量1000~1000000、又は1000~100000の縮合物を得ることができる。これらの分子量はGPC分析によるポリスチレン換算で得られる分子量である。
GPCの測定条件は、例えばGPC装置(商品名HLC-8220GPC、東ソー株式会社製)、GPCカラム(商品名ShodexKF803L、KF802、KF801、昭和電工製)、カラム温度は40℃、溶離液(溶出溶媒)はテトラヒドロフラン、流量(流速)は1.0ml/min、標準試料はポリスチレン(昭和電工株式会社製)を用いて行うことができる。
加水分解縮合物の製造方法は上述の通りに行うことができる。
硬化触媒としては、アンモニウム塩、環状アンモニウム化合物、環状アミン化合物、又はスルホニウム化合物を用いることができる。
硬化触媒はポリオルガノシロキサン100質量部に対して、0.01~10質量部、または0.01~5質量部、または0.01~3質量部である。
レオロジー調整剤としては、例えば、ジメチルフタレート、ジエチルフタレート、ジイソブチルフタレート、ジヘキシルフタレート、ブチルイソデシルフタレート等のフタル酸化合物、ジノルマルブチルアジペート、ジイソブチルアジペート、ジイソオクチルアジペート、オクチルデシルアジペート等のアジピン酸化合物、ジノルマルブチルマレート、ジエチルマレート、ジノニルマレート等のマレイン酸化合物、メチルオレート、ブチルオレート、テトラヒドロフルフリルオレート等のオレイン酸化合物、及びノルマルブチルステアレート、グリセリルステアレート等のステアリン酸化合物を挙げることができる。レオロジー調整剤が使用される場合、その使用量としては、固形分中で、例えば0.001~10質量%である。
焼成する条件としては、焼成温度80℃~250℃、焼成時間0.3~60分間の中から適宜、選択される。好ましくは、焼成温度130℃~250℃、焼成時間0.5~5分間である。ここで、形成されるレジスト下層膜の膜厚としては、例えば0.01~3.0μmであり、好ましくは、例えば0.01~1.0μmであり、または0.01~0.5μmであり、または0.01~0.05μmである。
次いで、レジスト下層膜の上に、EUVレジスト等の高エネルギー線レジストの層が形成される。高エネルギー線レジストの層の形成は、周知の方法、すなわち、高エネルギー線レジスト組成物溶液の下層膜上への塗布及び焼成によって行なうことができる。
EUVレジストとしては例えば、PMMA(ポリメチルメタクリレート)、ポリヒドロキシスチレン、フェノール樹脂等の樹脂を用いたレジスト組成物を用いることができる。
次に、所定のマスクを通して露光が行なわれる。露光には、EUV光(13.5nm)、電子線、X線等を使用することができる。露光後、必要に応じて露光後加熱(PEB:Post Exposure Bake)を行なうこともできる。露光後加熱は、加熱温度70℃~150℃、加熱時間0.3~10分間から適宜、選択される。
また、本発明では現像液に有機溶剤を用いてレジストの現像を行うことができる。これにより、例えばポジ型フォトレジストが使用された場合は、露光されない部分のフォトレジストが除去され、フォトレジストのパターンが形成される。
現像液としては、例えば、酢酸メチル、酢酸ブチル、酢酸エチル、酢酸イソプロピル、酢酸アミル、酢酸イソアミル、メトキシ酢酸エチル、エトキシ酢酸エチル、プロピレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテルアセテート、エチレングリコールモノプロピルエーテルアセテート、エチレングリコールモノブチルエーテルアセテート、エチレングリコールモノフェニルエーテルアセテート、ジエチレングリコールモノメチルエーテルアセテート、ジエチレングリコールモノプロピルエーテルアセテート、ジエチレングリコールモノエチルエーテルアセテート、ジエチレングリコールモノフェニルエーテルアセテート、ジエチレングリコールモノブチルエーテルアセテート、ジエチレングリコールモノエチルエーテルアセテート、2-メトキシブチルアセテート、3-メトキシブチルアセテート、4-メトキシブチルアセテート、3-メチル-3-メトキシブチルアセテート、3-エチル-3-メトキシブチルアセテート、プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールモノエチルエーテルアセテート、プロピレングリコールモノプロピルエーテルアセテート、2-エトキシブチルアセテート、4-エトキシブチルアセテート、4-プロポキシブチルアセテート、2-メトキシペンチルアセテート、3-メトキシペンチルアセテート、4-メトキシペンチルアセテート、2-メチル-3-メトキシペンチルアセテート、3-メチル-3-メトキシペンチルアセテート、3-メチル-4-メトキシペンチルアセテート、4-メチル-4-メトキシペンチルアセテート、プロピレングリコールジアセテート、蟻酸メチル、蟻酸エチル、蟻酸ブチル、蟻酸プロピル、乳酸エチル、乳酸ブチル、乳酸プロピル、炭酸エチル、炭酸プロピル、炭酸ブチル、ピルビン酸メチル、ピルビン酸エチル、ピルビン酸プロピル、ピルビン酸ブチル、アセト酢酸メチル、アセト酢酸エチル、プロピオン酸メチル、プロピオン酸エチル、プロピオン酸プロピル、プロピオン酸イソプロピル、2-ヒドロキシプロピオン酸メチル、2-ヒドロキシプロピオン酸エチル、メチル-3-メトキシプロピオネート、エチル-3-メトキシプロピオネート、エチル-3-エトキシプロピオネート、プロピル-3-メトキシプロピオネート等を例として挙げることができる。さらに、これらの現像液に界面活性剤などを加えることもできる。現像の条件としては、温度5~50℃、時間10~600秒から適宜選択される。
半導体基板上に本発明のレジスト下層膜が形成される前に、平坦化膜やギャップフィル材層や有機下層膜が形成されることもできる。大きな段差や、ホールを有する半導体基板が使用される場合には、平坦化膜やギャップフィル材層が形成されていることが好ましい。
合成例1
テトラエトキシシラン15.21g(70mol%)、メチルトリエトキシシラン3.72g(20mol%)、フェニルトリメトキシシラン2.07g(10mol%)、アセトン31.49gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸6.95gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート42.00gを加え、反応副生物であるエタノール、メタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(1-1)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw1100であった。
テトラエトキシシラン15.21g(70mol%)、メチルトリエトキシシラン4.65g(25mol%)、フェニルトリメトキシシラン1.03g(5mol%)、アセトン31.33gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸6.95gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート42.00gを加え、反応副生物であるエタノール、メタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(1-1)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw1300であった。
テトラメトキシシラン11.11g(70mol%)、メチルトリメトキシシラン3.55g(25mol%)、フェニルトリメトキシシラン1.03g(5mol%)、アセトン23.55gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸6.95gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート32.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(1-1)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw1300であった。
テトラメトキシシラン11.11g(70mol%)、メチルトリメトキシシラン2.84g(20mol%)、4-メトキシフェニルトリメトキシシラン2.38g(10mol%)、アセトン24.50gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸6.95gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート32.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(1-2)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw1200であった。
テトラメトキシシラン11.11g(70mol%)、メチルトリメトキシシラン4.26g(30mol%)、アセトン23.06gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸6.95gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート30.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(1-9)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw1300であった。
テトラエトキシシラン24.58g(70mol%)、トリエトキシメチルシラン6.01g(20mol%)、N-(3-(トリエトキシシリル)プロピル)ブチルアミド4.91g、アセトン53.26gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸11.23gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-1)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン23.34g(70mol%)、トリエトキシメチルシラン5.71g(20mol%)、ヘプタフルオロ-N-(3-(トリエトキシシリル)プロピル)ブタンアミド6.68g、アセトン53.60gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸10.67gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-2)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン24.81g(70mol%)、トリエトキシメチルシラン7.58g(25mol%)、N-(3-(トリエトキシシリル)プロピル)ベンゼンスルホンアミド3.08g、アセトン53.20gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸11.34gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-3)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン24.21g(70mol%)、トリエトキシメチルシラン5.92g(20mol%)、N-(3-(トリエトキシシリル)プロピル)プロパンスルホンアミド5.44g、アセトン53.36gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸11.06gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-4)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン24.87g(70mol%)、トリエトキシメチルシラン6.08g(20mol%)、1-プロピル-3-(3-(トリメトキシシリル)プロピル)ウレア4.51g、アセトン53.18gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸11.36gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-5)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン23.38g(70mol%)、トリエトキシメチルシラン5.72g(20mol%)、3-(トリエトキシシリル)プロピルジアリルイソシアヌレート6.63g、アセトン53.59gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸10.68gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-6)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン23.95g(70mol%)、トリエトキシメチルシラン5.86g(20mol%)、式(b-1-8)モノマー5.82g、アセトン53.43gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸10.94gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-7)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン23.90g(70mol%)、トリエトキシメチルシラン5.84g(20mol%)、式(b-1-9)モノマー5.89g、アセトン53.45gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸10.92gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-8)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン24.46g(70mol%)、トリエトキシメチルシラン5.98g(20mol%)、式(b-1-10)モノマー5.09g、アセトン53.29gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸11.18gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-9)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン24.31g(70mol%)、トリエトキシメチルシラン5.94g(20mol%)、N-(5-(トリメトキシシリル)-2-アザ-1-オキソペンチル)-カプロラクタム(式(b-1-11))5.31g、アセトン53.37gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸11.11gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-10)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン23.81g(70mol%)、トリエトキシメチルシラン5.82g(20mol%)、(S)-N-1-フェニルエチル-N-トリエトキシシリルプロピルウレア(式(b-1-12))6.02g、アセトン53.47gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸10.88gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-11)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン23.46g(70mol%)、トリエトキシメチルシラン2.87g(20mol%)、N-(3-(トリエトキシシリル)プロピル)ブチルアミド9.38g、アセトン53.57gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸10.72gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-1)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン21.37g(70mol%)、トリエトキシメチルシラン2.61g(10mol%)、3-(トリエトキシシリル)プロピルジアリルイソシアヌレート12.12g、アセトン54.14gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸9.76gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-6)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン22.33g(70mol%)、トリエトキシメチルシラン2.73g(10mol%)、式(b-1-8)モノマー10.86g、アセトン53.88gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸10.20gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-7)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン23.24g(70mol%)、トリエトキシメチルシラン2.84g(10mol%)、式(b-1-10)モノマー9.67g、アセトン53.63gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸10.62gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-9)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン22.97g(70mol%)、トリエトキシメチルシラン2.81g(10mol%)、N-(5-(トリメトキシシリル)-2-アザ-1-オキソペンチル)-カプロラクタム(式(b-1-11)10.03g、アセトン53.70gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸10.49gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-10)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン22.44g(70mol%)、N-(3-(トリエトキシシリル)プロピル)ブチルアミド13.46g、アセトン53.85gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸10.25gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-12)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン19.67g(70mol%)、3-(トリエトキシシリル)プロピルジアリルイソシアヌレート16.73g、アセトン54.61gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸8.99gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-13)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン20.92g(70mol%)、式(b-1-8)モノマー15.26g、アセトン54.26gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸9.56gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-14)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン22.14g(70mol%)、式(b-1-10)モノマー13.82g、アセトン53.93gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸10.12gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-14-2)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン21.76g(70mol%)、N-(5-(トリメトキシシリル)-2-アザ-1-オキソペンチル)-カプロラクタム(式(b-1-11))14.26g、アセトン54.03gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸9.95gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-15)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン25.59g(70mol%)、トリエトキシメチルシラン6.26g、フェニルトリメトキシシラン3.48g、アセトン52.98gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸11.69gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(1-1)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラエトキシシラン25.25g(70mol%)、トリエトキシメチルシラン6.18g(20mol%)、[4-(メトキシメトキシ)フェニル]トリメトキシシラン3.95g(10mol%)、アセトン53.08gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸11.54gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーはGPCによる重量平均分子量はポリスチレン換算でMw2000であった。
上記合成例1~5で得られたケイ素含有ポリマー、酸、硬化触媒、溶媒、水を表1に示す割合で混合し、レジスト下層膜形成組成物をそれぞれ調製した。表1中のポリマーの添加割合はポリマー溶液の添加量ではなく、ポリマー自体の添加量を示した。
表1中でマレイン酸はMA、ベンジルトリエチルアンモニウムクロリドはBTEAC、N-(3-トリエトキシシリプロピル)-4,5-ジヒドロイミダゾールはIMIDTEOS、トリフェニルスルホニウムクロリドはTPSCl、マレイン酸モノトリフェニルスルフォニウムはTPSMA、プロピレングリコールモノメチルエーテルアセテートはPGMEA、プロピレングリコールモノエチルエーテルはPGEE、プロピレングリコールモノメチルエーテルはPGMEと略した。
また、表1中でN-(3-(トリエトキシシリル)プロピル)ブチルアミドはAmideTEOS、ヘプタフルオロ-N-(3-(トリエトキシシリル)プロピル)ブタンアミドはFamideTEOS、N-(3-(トリエトキシシリル)プロピル)ベンゼンスルホンアミドはBSA、N-(3-(トリエトキシシリル)プロピル)プロパンスルホンアミドはPrSA、1-(3-(トリメトキシシリル)プロピル)ウレアはUreaTMOS、1-プロピル-3-(3-(トリメトキシシリル)プロピル)ウレアはPrureaTMOS、3-(トリエトキシシリル)プロピルジアリルイソシアヌレートはDAICATEOSと略した。水は超純水を用いた。各添加量は質量部で示した。
表1中でマレイン酸はMA、ベンジルトリエチルアンモニウムクロリドはBTEAC、N-(3-トリエトキシシリプロピル)-4,5-ジヒドロイミダゾールはIMIDTEOS、トリフェニルスルホニウム硝酸塩はTPSNO3、トリフェニルスルホニウムカンファースルホン酸塩はTPSCS、ビスフェノールスルホンはBPS、6-(3-(トリメトキシシリル)プロピル)-5H-ジベンゾ[c,e]アゼピン-5,7(6H)-ジオンはDPImTMOS、2-(3-(トリエトキシシリル)プロピル)-1H-ベンゾ[f]イソインドール-1,3(2H)-ジオンはNAImTEOS、1-(3―(トリエトキシシリル)プロピル)ピロリジン-2,5-ジオンはSucImTEOS、N-(5-(トリメトキシシリル)-2-アザ-1-オキソペンチル)-カプロラクタムはCapUreaTMOS、(S)-N-1-フェニルエチル-N-トリエトキシシリルプロピルウレアはPhEtUreaTEOS、プロピレングリコールモノメチルエーテルアセテートはPGMEA、プロピレングリコールモノエチルエーテルはPGEE、プロピレングリコールモノメチルエーテルはPGMEと略した。水は超純水を用いた。各添加量は質量部で示した。
丸善石油化学株式会社製のCNp-PM(成分はモル比としてビニルナフタレン60%:ヒドロキシスチレン40%、重量平均分子量:6000)を有機下層膜(A1層)として使用した。
以下に本発明の薄膜形成組成物による薄膜を、レジスト下層膜として使用した場合の評価結果を以下に示す。
(光学定数測定)
実施例1-14、比較例1-5で調製した本願レジスト下層膜形成組成物を、スピナーを用いてシリコンウェハー上にそれぞれ塗布した。ホットプレート上で240℃で1分間加熱し、本願レジスト下層膜(膜厚0.05μm)を形成した。そして、これらのレジスト下層膜を分光エリプソメーター(J.A. Woollam社製、VUV-VASE VU-302)を用い、波長193、248nmでの屈折率(n値)及び光学吸光係数(k値、減衰係数とも呼ぶ)を測定した。
上記有機下層膜(A1層)形成組成物をシリコンウエハー上に塗布し、ホットプレート上で240℃で60秒間ベークし、膜厚90nmの有機下層膜(A1層)を得た。その上に、本発明の実施例1-14、比較例1-5で調製されたレジスト下層膜形成組成物溶液をスピンコートし、240℃で1分間加熱することにより、レジスト下層膜(B)層(20nm)が形成される。そのハードマスク上に、EUV用レジスト溶液(メタクリレート樹脂系レジスト)をスピンコートし加熱を行い、EUVレジスト層(C)層を形成し、EUV露光装置(Micro Exposure Tool 略称MET)を用い、NA=0.30、σ=0.36/0.68 Quadropoleの条件で露光する。露光後、PEBを行い、クーリングプレート上で室温まで冷却し、アルカリ水溶液(テトラメチルアンモニウム水酸化物の2.38質量%水溶液)による現像及びリンス処理をし、レジストパターンを形成した。評価は、26nmのラインアンドスペースの形成可否、パターン断面観察によるパターン形状を評価した。
窒素下、100mL四口フラスコにカルバゾール(6.69g、0.040mol、東京化成工業(株)製)、9-フルオレノン(7.28g、0.040mol、東京化成工業(株)製)、パラトルエンスルホン酸一水和物(0.76g、0.0040mol、東京化成工業(株)製)を加え、1,4-ジオキサン(6.69g、関東化学(株)製)を仕込み撹拌し、100℃まで昇温し溶解させ重合を開始した。24時間後60℃まで放冷後、クロロホルム(34g、関東化学(株)製)を加え希釈し、メタノール(168g、関東化学(株)製)へ再沈殿させた。得られた沈殿物をろ過し、減圧乾燥機で80℃、24時間乾燥し、目的とするポリマー(式(C-1)、以下PCzFLと略す)9.37gを得た。
1H-NMR(400MHz,DMSO-d6):δ7.03-7.55(br,12H),δ7.61-8.10(br,4H),δ11.18(br,1H)
PCzFLのGPCによるポリスチレン換算で測定される重量平均分子量Mwは2800、多分散度Mw/Mnは1.77であった。
得られた樹脂20gに、架橋剤としてテトラメトキシメチルグリコールウリル(三井サイテック(株)製、商品名パウダーリンク1174)3.0g、触媒としてピリジニウムパラトルエンスルホネート0.30g、界面活性剤としてメガファックR-30(大日本インキ化学(株)製、商品名)0.06gを混合し、プロピレングリコールモノメチルエーテルアセテート88gに溶解させ溶液とした。その後、孔径0.10μmのポリエチレン製ミクロフィルターを用いて濾過し、更に、孔径0.05μmのポリエチレン製ミクロフィルターを用いて濾過して、多層膜によるリソグラフィープロセスに用いる有機下層膜(A2層)形成組成物の溶液を調製した。
ドライエッチング速度の測定に用いたエッチャー及びエッチングガスは以下のものを用いた。
ES401(日本サイエンティフィック製):CF4
RIE-10NR(サムコ製):O2
実施例15~40、比較例6で調製したSi含有レジスト下層膜形成組成物の溶液をスピナーを用い、シリコンウェハー上に塗布した。ホットプレート上で240℃1分間加熱し、Si含有レジスト下層膜(膜厚50nm(CF4ガスでのエッチング速度測定用)、50nm(O2ガスでのエッチング速度測定用)をそれぞれ形成した。また、同様に有機下層膜(A2層)形成組成物をスピナーを用い、シリコンウェハー上に塗膜を形成(膜厚0.20μm)した。エッチングガスとしてO2ガスを使用してドライエッチング速度を測定し、実施例15~40、比較例6のSi含有レジスト下層膜のドライエッチング速度との比較を行った。
表5にフッ素系ガス(CF4ガス)でのエッチレート(エッチング速度:nm/分)、酸素系ガス(O2ガス)耐性は、(本願レジスト下層膜)/(有機下層膜A2層)のエッチレート比で示した。
上記有機下層膜(A2層)形成組成物をシリコンウエハー上に塗布し、ホットプレート上で240℃で60秒間ベークし、膜厚90nmの有機下層膜(A2層)を得た。その上に、本発明の実施例15~40、比較例6で調製されたレジスト下層膜形成組成物溶液をスピンコートし、240℃で1分間加熱することにより、レジスト下層膜(B)層(20nm)が形成される。そのハードマスク上に、EUV用レジスト溶液(メタクリレート樹脂系レジスト)をスピンコートし加熱を行い、EUVレジスト層(C)層を形成し、EUV露光装置を用い、NA=0.30、σ=0.3/0.7 Annularの条件で露光する。露光後、PEBを行い、クーリングプレート上で室温まで冷却し、アルカリ水溶液(テトラメチルアンモニウム水酸化物の2.38質量%水溶液)による現像及びリンス処理をし、レジストパターンを形成した。評価は、26nmのラインアンドスペースの形成可否、パターン断面観察によるパターン形状を評価した。
表6で良好とはフッティングからアンダーカットの間の形状であり、かつスペース部に著しい残渣がないという状態を示し、倒れとはレジストパターンが剥がれ倒壊しているという好ましくない状態を示し、ブリッジとはレジストパターンの上部もしくは下部同士が接触しているという好ましくない状態を示す。
合成例28
テトラメトキシシラン22.68g(70mol%)、メチルトリメトキシシラン7.25g(25mol%)、トリエトキシシリルプロピルジアリルイソシアヌレート4.40g、アセトン51.49gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸14.18gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-6)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
合成例29
テトラメトキシシラン21.12g(70mol%)、メチルトリメトキシシラン5.40g(20mol%)、トリエトキシシリルプロピルジアリルイソシアヌレート8.20g、アセトン52.08gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸13.21gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーは式(B-6)に相当し、GPCによる重量平均分子量はポリスチレン換算でMw2000であった。
テトラメトキシシラン23.25g(70mol%)、メチルトリメトキシシラン5.95g(20mol%)、[4-(メトキシメトキシ)フェニル]トリメトキシシラン4.98g(10mol%)、アセトン51.27gを300mlのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら0.01mol/lの塩酸14.54gを混合溶液に滴下した。添加後、85℃に調整されたオイルバスにフラスコを移し、加温還流下で240分反応させた。その後、反応溶液を室温まで冷却し、反応溶液にプロピレングリコールモノメチルエーテルアセテート68.00gを加え、反応副生物であるメタノール、アセトン、水、塩酸を減圧留去し、濃縮して加水分解縮合物(ポリマー)プロピレングリコールモノメチルエーテルアセテート溶液を得た。プロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノエチルエーテル20/80の溶媒比率として140℃における固形残物換算で20重量パーセントとなるように調整した。得られたポリマーはGPCによる重量平均分子量はポリスチレン換算でMw2000であった。
4-ヒドロキシフェニルメタクリルアミド30.0g、1-アダマンチルメタクリレート37.3g、ベンジルメタクリレート14.9g、2,2’-アゾビスイソブチロニトリル4.11g、プロピレングリコールモノメチルエーテル345.4gを溶解させた後、この溶液を加熱し、85℃で約20時間撹拌した。得られた樹脂は下記式(C-2)に相当した。GPCによりポリスチレン換算で測定される重量平均分子量Mwは、6,100であった。
ドライエッチング速度の測定に用いたエッチャー及びエッチングガスは以下のものを用いた。
ES401(日本サイエンティフィック製):CF4
RIE-10NR(サムコ製):O2
実施例41~49、比較例7で調製したSi含有レジスト下層膜形成組成物の溶液をスピナーを用い、シリコンウェハー上に塗布した。ホットプレート上で240℃1分間加熱し、Si含有レジスト下層膜(膜厚50nm(CF4ガスでのエッチング速度測定用)、50nm(O2ガスでのエッチング速度測定用)をそれぞれ形成した。また、同様に有機下層膜(A3層)形成組成物をスピナーを用い、シリコンウェハー上に塗膜を形成(膜厚0.20μm)した。エッチングガスとしてO2ガスを使用してドライエッチング速度を測定し、実施例41~49、比較例7のSi含有レジスト下層膜のドライエッチング速度との比較を行った。
表8にフッ素系ガス(CF4ガス)でのエッチレート(エッチング速度:nm/分)、酸素系ガス(O2ガス)耐性は、(本願レジスト下層膜)/(有機下層膜A3層)のエッチレート比で示した。
上記有機下層膜(A3層)形成組成物をシリコンウエハー上に塗布し、ホットプレート上で240℃で60秒間ベークし、膜厚90nmの有機下層膜(A3層)を得た。その上に、本発明の実施例41~49、比較例7で調製されたレジスト下層膜形成組成物溶液をスピンコートし、240℃で1分間加熱することにより、レジスト下層膜(B)層(20nm)が形成される。そのハードマスク上に、EUV用レジスト溶液(FFEM社製NTDレジスト)をスピンコートし加熱を行い、EUVレジスト層(C)層を形成し、EUV露光装置を用い、NA=0.30、σ=0.3/0.7 Annularの条件で露光する。露光後、PEBを行い、クーリングプレート上で室温まで冷却し、FFEM社製FN-DP001(有機溶剤/酢酸ブチル)を用い現像及びリンス処理をし、レジストパターンを形成した。評価は、26nmのラインアンドスペースの形成可否、パターン断面観察によるパターン形状を評価した。
表2で良好とはフッティングからアンダーカットの間の形状であり、かつスペース部に著しい残渣がないという状態を示し、倒れとはレジストパターンが剥がれ倒壊しているという好ましくない状態を示し、ブリッジとはレジストパターンの上部もしくは下部同士が接触しているという好ましくない状態を示す。
Claims (14)
- 加水分解性シラン(a)の加水分解縮合物を含むポリシロキサン(A)と、スルホンアミド構造、カルボン酸アミド構造、ウレア構造、又はイソシアヌル酸構造を有する加水分解性シラン化合物(b)とを含むEUVリソグラフィー用レジスト下層膜形成組成物。
- 加水分解性シラン(a)と、スルホンアミド構造、カルボン酸アミド構造、ウレア構造、又はイソシアヌル酸構造を有する加水分解性シラン化合物(b)との加水分解縮合物を含むポリシロキサン(B)とを含むEUVリソグラフィー用レジスト下層膜形成組成物。
- 加水分解性シラン(a)が、テトラアルコキシシラン、アルキルトリアルコキシシラン及びアリールトリアルコキシシランからなる群から選ばれる少なくとも1種の加水分解性シランである請求項1又は請求項2に記載のレジスト下層膜形成組成物。
- 上記アルキルトリアルコキシシランがメチルトリアルコキシシランである請求項3に記載のレジスト下層膜形成組成物。
- 上記アリールトリアルコキシシランがフェニルトリアルコキシシランである請求項3又は請求項4に記載のレジスト下層膜形成組成物。
- 上記ポリシロキサン(A)は、テトラアルコキシシラン70モルに対して、アルキルトリアルコキシシラン10~35モル、アリールトリアルコキシシランが2~25モルの割合で共加水分解し縮合したものである請求項1及び請求項3乃至請求項6のいずれか1項に記載のレジスト下層膜形成組成物。
- 更に酸化合物を含む請求項1乃至請求項7のいずれか1項に記載のレジスト下層膜形成組成物。
- 更に水を含む請求項1乃至請求項8のいずれか1項に記載のレジスト下層膜形成組成物。
- 更にアンモニウム化合物、環状アンモニウム化合物、環状アミン化合物、又はスルホニウム化合物を含む請求項1乃至請求項9のいずれか1項に記載のレジスト下層膜形成組成物。
- 請求項1乃至請求項10のいずれか1項に記載のレジスト下層膜形成組成物を半導体基板上に塗布し焼成することによって得られるレジスト下層膜。
- 請求項1乃至請求項10のいずれか1項に記載のレジスト下層膜形成組成物を半導体基板上に塗布し、焼成してレジスト下層膜を形成する工程、前記レジスト下層膜の上にレジスト用組成物を塗布し、レジスト膜を形成する工程、前記レジスト膜を露光する工程、露光後にレジスト膜を現像し、パターン化されたレジスト膜を得る工程、パターン化されたレジスト膜によりレジスト下層膜をエッチングする工程、及びパターン化されたレジスト膜及びレジスト下層膜により半導体基板を加工する工程を含む半導体装置の製造方法。
- 半導体基板上に有機下層膜を形成する工程、その上に請求項1乃至請求項10のいずれか1項に記載のレジスト下層膜形成組成物を塗布し、焼成してレジスト下層膜を形成する工程、前記レジスト下層膜の上にレジスト用組成物を塗布し、レジスト膜を形成する工程、前記レジスト膜を露光する工程、露光後にレジスト膜を現像し、パターン化されたレジスト膜を得る工程、パターン化されたレジスト膜によりレジスト下層膜をエッチングする工程、パターン化されたレジスト下層膜により有機下層膜をエッチングする工程、及びパターン化された有機下層膜により半導体基板を加工する工程を含む半導体装置の製造方法。
- 現像がアルカリ水溶液又は有機溶剤によって行われる請求項12又は請求項13に記載の製造方法。
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US9627217B2 (en) | 2017-04-18 |
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CN104246614B (zh) | 2020-09-08 |
CN104246614A (zh) | 2014-12-24 |
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US20150079792A1 (en) | 2015-03-19 |
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