WO2013058189A1 - レジスト下層膜形成組成物用添加剤及びそれを含むレジスト下層膜形成組成物 - Google Patents
レジスト下層膜形成組成物用添加剤及びそれを含むレジスト下層膜形成組成物 Download PDFInfo
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- WO2013058189A1 WO2013058189A1 PCT/JP2012/076458 JP2012076458W WO2013058189A1 WO 2013058189 A1 WO2013058189 A1 WO 2013058189A1 JP 2012076458 W JP2012076458 W JP 2012076458W WO 2013058189 A1 WO2013058189 A1 WO 2013058189A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
- C08F20/10—Esters
- C08F20/34—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate
- C08F20/36—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate containing oxygen in addition to the carboxy oxygen, e.g. 2-N-morpholinoethyl (meth)acrylate or 2-isocyanatoethyl (meth)acrylate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/32—Esters containing oxygen in addition to the carboxy oxygen containing epoxy radicals
- C08F220/325—Esters containing oxygen in addition to the carboxy oxygen containing epoxy radicals containing glycidyl radical, e.g. glycidyl (meth)acrylate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/34—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate
- C08F220/343—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate in the form of urethane links
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/34—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate
- C08F220/36—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate containing oxygen in addition to the carboxy oxygen, e.g. 2-N-morpholinoethyl (meth)acrylate or 2-isocyanatoethyl (meth)acrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/14—Esterification
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- 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
- G03F7/11—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having cover layers or intermediate layers, e.g. subbing layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- 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
Definitions
- the present invention relates to an additive added to a resist underlayer film forming composition.
- an additive (modifier) that modifies the surface layer of the resist underlayer film to be formed, improves adhesion with the resist, and forms a pattern with a desired shape on the resist underlayer film.
- the resist underlayer film forming composition containing the said additive (modifier).
- Patent Document 1 That is, by using a structure including a polar site such as a lactone structure as a constituent component of the resist underlayer film forming composition, adhesion to the resist pattern is improved, and the resist pattern is prevented from collapsing even in a fine resist pattern. It is expected.
- a method for controlling the chemical state at the interface between the resist and the resist underlayer film is a method for expressing high adhesion to the resist. That is, in a positive resist, when the chemical state of the interface between the resist and the resist underlayer film is an acidic state, the resulting resist pattern shape is an undercut shape, and the contact area of the resist pattern is extremely reduced, thereby reducing the resist pattern. Prone to collapse.
- the undercut shape of the resist pattern shape can be suppressed, and a resist obtained by introducing a polar site such as a lactone structure It is expected to exhibit stronger adhesion than the adhesion to the.
- the resist underlayer film surface state is changed to a base. It is an object of the present invention to provide an additive for a resist underlayer film forming composition that is modified into a neutral state.
- the first aspect of the present invention is an additive for a resist underlayer film forming composition
- a polymer having a structural unit represented by the following formula (1) wherein R 1 represents a hydrogen atom or a methyl group, L represents a divalent linking group, X represents an amino group protected with a tert-butoxycarbonyl group or a nitrogen-containing group protected with a tert-butoxycarbonyl group) Represents an acyloxy group having a heterocyclic ring.
- the second aspect of the present invention is an additive for a resist underlayer film forming composition
- a copolymer having a structural unit represented by the following formula (1 ′) and a structural unit represented by the following formula (2). is there.
- R 1 and R 3 each independently represent a hydrogen atom or a methyl group
- R 2 represents an alkylene group having 2 to 4 carbon atoms, and a part of the hydrogen atoms of the alkylene group is substituted with a hydroxy group
- X represents an amino group protected with a tert-butoxycarbonyl group or an acyloxy group having a nitrogen-containing heterocyclic ring protected with a tert-butoxycarbonyl group
- Y represents the number of carbon atoms in which at least one hydrogen atom is substituted with a fluorine atom
- a third aspect of the present invention is a resist underlayer film forming composition for lithography comprising a resin binder, an organic solvent, and the additive for a resist underlayer film forming composition of the first aspect or the second aspect.
- the resist underlayer film forming composition may further contain a crosslinking agent and a crosslinking catalyst.
- the resist underlayer film forming composition of the third aspect is applied to a substrate having a film to be processed for forming a transfer pattern, and baked to form a resist underlayer film.
- a resist is coated on the lower layer film, and the substrate coated with the resist is irradiated with radiation selected from the group consisting of a KrF excimer laser, an ArF excimer laser, extreme ultraviolet rays, and an electron beam, and then developed to form a resist pattern.
- the semiconductor device is manufactured by transferring the pattern onto the substrate by dry etching using the resist pattern as a mask.
- the resist underlayer film forming composition to which the additive according to the present invention is added to a lithography process, it is effective in suppressing the collapse of the formed resist pattern even in the formation of a resist pattern with a fine line width. is there.
- the additive which concerns on 1st aspect of this invention consists of a polymer which has a structural unit represented by the said Formula (1).
- the polymer may be either a homopolymer or a copolymer.
- the divalent linking group represented by L in the formula (1) is not particularly limited, and examples thereof include a —C ( ⁇ O) OR 2 — group, a phenylene group, and the —C ( ⁇ O) OR.
- R 2 of the 2 -group is synonymous with R 2 of the structural unit represented by the formula (1 ′).
- an acyloxy group having an amino group protected with a tert-butoxycarbonyl group or a nitrogen-containing heterocyclic ring protected with a tert-butoxycarbonyl group, represented by X in the formula (1), is represented by the following formula ( a) to (j).
- the acyloxy group is “—OC ( ⁇ O) —R” (where R is an organic group having an amino group protected with a tert-butoxycarbonyl group or a nitrogen-containing complex protected with a tert-butoxycarbonyl group.
- the tert-butoxycarbonyl group may be abbreviated as “t-Boc” or “Boc”.
- the polymer having the structural unit represented by the formula (1) is obtained, for example, by reacting a polymer having an epoxy group at a terminal with a monomer that reacts with the epoxy group.
- monomers include N- (tert-butoxycarbonyl) glycine, N- (tert-butoxycarbonyl) alanine, N- (tert-butoxycarbonyl) valine, N- (tert-butoxycarbonyl) leucine, N— (Tert-butoxycarbonyl) isoleucine, N- (tert-butoxycarbonyl) methionine, N- (tert-butoxycarbonyl) serine, N- (tert-butoxycarbonyl) threonine, N- (tert-butoxycarbonyl) proline, N- (Tert-butoxycarbonyl) -histidine, N- (tert-butoxycarbonyl) phenylalanine, N- (tert-butoxycarbonyl) tyros
- the additive according to the second aspect of the present invention comprises a copolymer having a structural unit represented by the formula (1 ′) and a structural unit represented by the formula (2).
- examples of the alkylene group having 2 to 4 carbon atoms represented by R 2 include ethylene. Group, —CH 2 —CH (OH) —CH 2 — group.
- an acyloxy group having an amino group protected with a tert-butoxycarbonyl group represented by X or a nitrogen-containing heterocyclic ring protected with a tert-butoxycarbonyl group is represented by the formula (1). It is synonymous with X in the structural unit represented by
- the linking group containing at least one selected from the group consisting of “—C ( ⁇ O) —”, “—CH 2 —” and “—O—” represented by M 1 is Examples thereof include a —C ( ⁇ O) O— group and a —C ( ⁇ O) O—CH 2 — group.
- M 1 represents a direct bond
- the alkyl group having 2 to 6 carbon atoms in which at least one hydrogen atom represented by Y is substituted with a fluorine atom is directly bonded to the main chain.
- Examples of the monomer that forms the structural unit represented by the formula (2) include monofluoroethyl acrylate, monofluoroethyl methacrylate, trifluoroethyl acrylate, trifluoroethyl methacrylate, tetrafluoropropyl acrylate, Tetrafluoropropyl methacrylate, pentafluoropropyl acrylate, pentafluoropropyl methacrylate, hexafluoropropyl acrylate, hexafluoropropyl methacrylate, hexafluoroisopropyl acrylate, hexafluoroisopropyl methacrylate, hexafluorobutyl acrylate, methacrylic acid Hexafluorobutyl, heptafluorobutyl acrylate, heptafluorobutyl methacrylate, octafluoropentyl acrylate,
- the copolymer having the structural unit represented by the formula (1 ′) and the structural unit represented by the formula (2) reacts with, for example, an acrylic copolymer having an epoxy group at the terminal and the epoxy group. It is obtained by reacting with the aforementioned monomer.
- p is usually 0 in the formula (1). 0.05 to 0.95, and q is usually 0.05 to 0.95.
- p is 0.2 to 0.8 and q is 0.2 to 0.8.
- the additive copolymer according to the second aspect of the present invention may further have a structural unit represented by the following formula (3).
- R 4 represents a hydrogen atom or a methyl group
- M 2 represents a direct bond or at least selected from the group consisting of “—C ( ⁇ O) —”, “—CH 2 —” and “—O—”
- 1 represents a linking group including one
- Z represents an alkyl group having 1 to 6 carbon atoms, an aryl group or an arylalkyl group having at least one hydroxy group, alkoxy group or carboxyl group, or the above M 2 is directly
- Z represents a carboxyl group
- the linking group containing at least one selected from the group consisting of “—C ( ⁇ O) —”, “—CH 2 —” and “—O—” represented by M 2 examples thereof include a —C ( ⁇ O) O— group and a —C ( ⁇ O) O—CH 2 — group.
- M 2 represents a direct bond
- the alkyl group, aryl group, arylalkyl group, or carboxyl group having 1 to 6 carbon atoms having at least one hydroxy group, alkoxy group, or carboxyl group represented by Z Binds directly to the main chain.
- examples of the alkoxy group include a methoxy group, an ethoxy group, and a tert-butoxy group.
- Examples of the aryl group include a phenyl group and a naphthyl group.
- Examples of the arylalkyl group include a benzyl group and a phenethyl group. Is mentioned.
- Examples of the monomer that forms the structural unit represented by the formula (3) include, for example, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, dihydroxypropyl acrylate, dihydroxypropyl methacrylate, Hydroxybutyl acrylate, hydroxybutyl methacrylate, hydroxypentyl acrylate, hydroxypentyl methacrylate, hydroxystyrene, 4-tert-butoxystyrene, hydroxyphenyl acrylate, hydroxyphenyl methacrylate, acrylic acid, methacrylic acid, carboxystyrene It is done.
- p is usually 0.05 to 0.95.
- q is usually 0.05 to 0.95
- r is usually 0.05 to 0.95.
- p is 0.2 to 0.8
- q is 0.2 to 0.8
- r is 0.2 to 0.8.
- the resist underlayer film forming composition according to the third aspect of the present invention is constituted by including the additive for the resist underlayer film forming composition of the present invention in the organic solvent together with the resin binder.
- Examples of the organic solvent contained in the resist underlayer film forming composition of the present invention include propylene glycol monomethyl ether (PGME), propylene glycol monomethyl ether acetate (PGMEA), propylene glycol monoethyl ether, propylene glycol monopropyl ether, methyl ethyl ketone, Examples thereof include ethyl lactate, cyclohexanone, ⁇ -butyrolactone, N-methylpyrrolidone, and a mixture of two or more selected from these organic solvents.
- the ratio of the said organic solvent with respect to the resist underlayer film forming composition of this invention is 50 mass% thru
- the resin binder contained in the resist underlayer film forming composition of the present invention for example, a polymer obtained by Synthesis Example 1 described later can be applied. Further, as the resin binder, a base polymer contained in a known antireflection film forming composition or a known resist underlayer film forming composition can be applied as a resin binder.
- the ratio of the resin binder to the solid content excluding the organic solvent from the resist underlayer film forming composition of the present invention is, for example, 50% by mass to 99.5% by mass, preferably 60% by mass to 90% by mass.
- the resist underlayer film forming composition of the present invention contains the aforementioned polymer or copolymer as an additive, and the ratio thereof is, for example, 0.1 mass relative to the solid content of the resist underlayer film forming composition of the present invention. % To 30% by mass, preferably 1% to 15% by mass.
- the resist underlayer film forming composition of the present invention can contain a crosslinking agent as an optional component.
- a crosslinking agent examples include hexamethoxymethyl melamine, tetramethoxymethyl benzoguanamine, 1,3,4,6-tetrakis (methoxymethyl) glycoluril (POWDERLINK (registered trademark) 1174), 1,3,4, 6-tetrakis (butoxymethyl) glycoluril, 1,3,4,6-tetrakis (hydroxymethyl) glycoluril, 1,3-bis (hydroxymethyl) urea, 1,1,3,3-tetrakis (butoxymethyl) And urea and 1,1,3,3-tetrakis (methoxymethyl) urea.
- the content rate of the said crosslinking agent is 1 mass% thru
- the resist underlayer film forming composition of the present invention can contain a crosslinking catalyst that promotes a crosslinking reaction as an optional component.
- crosslinking catalysts include p-toluenesulfonic acid, trifluoromethanesulfonic acid, pyridinium-p-toluenesulfonate, salicylic acid, camphorsulfonic acid, 5-sulfosalicylic acid, 4-chlorobenzenesulfonic acid, 4-hydroxybenzenesulfonic acid.
- Sulfonic acid compounds such as benzenedisulfonic acid, 1-naphthalenesulfonic acid, citric acid, benzoic acid and hydroxybenzoic acid, and carboxylic acid compounds.
- the content of the crosslinking catalyst is, for example, 0.1% by mass to 10% by mass with respect to the crosslinking agent.
- the crosslinking agent and the crosslinking catalyst are components that are not necessary for the resist underlayer film forming composition of the present invention.
- the substrate used in the method for manufacturing a semiconductor device according to the fourth aspect of the present invention is typically a silicon wafer, but is an SOI (Silicon on Insulator) substrate, or gallium arsenide (GaAs), indium phosphide (A compound semiconductor wafer such as InP) or gallium phosphide (GaP) may be used.
- An insulating film such as a silicon oxide film, a nitrogen-containing silicon oxide film (SiON film), a carbon-containing silicon oxide film (SiOC film), or a fluorine-containing silicon oxide film (SiOF film) is formed on the substrate as a film to be processed. Is formed. In this case, the resist underlayer film is formed on the film to be processed.
- the resist solution used for coating the resist may be either a positive type or a negative type, and may be a radiation selected from the group consisting of a KrF excimer laser, an ArF excimer laser, extreme ultraviolet rays, and an electron beam.
- a photosensitive chemically amplified resist can be used.
- an alkaline developer such as an aqueous solution of tetramethylammonium hydroxide (TMAH) can be used as the developer used for the development performed after the radiation irradiation.
- TMAH tetramethylammonium hydroxide
- the weight average molecular weights of the polymers shown in Synthesis Examples 1 to 12 of the present specification are measurement results by gel permeation chromatography (hereinafter abbreviated as GPC).
- the measurement conditions etc. are as follows using the Tosoh Co., Ltd. product GPC apparatus for a measurement.
- the polymer obtained in this synthesis example corresponds to an intermediate for synthesizing the additive copolymer according to the present invention.
- the polymer obtained in this synthesis example corresponds to an intermediate for synthesizing the additive copolymer according to the present invention.
- Cation exchange resin product name: Dowex [registered trademark] 550A, Muromachi Technos Co., Ltd.
- anion exchange resin product name: Amberlite [registered trademark] 15 JWET, Organo Corporation
- the polymer obtained in this synthesis example corresponds to the copolymer of the additive according to the present invention, and has an amino group protected with a tert-butoxycarbonyl group.
- the polymer obtained in this synthesis example corresponds to the copolymer of the additive according to the present invention, and has an amino group protected with a tert-butoxycarbonyl group.
- Cation exchange resin product name: Dowex [registered trademark] 550A, Muromachi Technos Co., Ltd.
- anion exchange resin product name: Amberlite [registered trademark] 15 JWET, Organo Corporation
- the polymer obtained in this synthesis example corresponds to the copolymer of the additive according to the present invention, and has an amino group protected with a tert-butoxycarbonyl group.
- Cation exchange resin product name: Dowex [registered trademark] 550A, Muromachi Technos Co., Ltd.
- anion exchange resin product name: Amberlite [registered trademark] 15 JWET, Organo Corporation
- the polymer obtained in this synthesis example corresponds to the copolymer of the additive according to the present invention, and has an amino group protected with a tert-butoxycarbonyl group.
- Cation exchange resin product name: Dowex [registered trademark] 550A, Muromachi Technos Co., Ltd.
- anion exchange resin product name: Amberlite [registered trademark] 15 JWET, Organo Corporation
- the polymer obtained in this synthesis example corresponds to the copolymer of the additive according to the present invention, and has an amino group protected with a tert-butoxycarbonyl group.
- Cation exchange resin product name: Dowex [registered trademark] 550A, Muromachi Technos Co., Ltd.
- anion exchange resin product name: Amberlite [registered trademark] 15 JWET, Organo Corporation
- the polymer obtained in this synthesis example corresponds to a copolymer of the additive according to the present invention, and has a nitrogen-containing heterocyclic ring protected with a tert-butoxycarbonyl group.
- Cation exchange resin product name: Dowex [registered trademark] 550A, Muromachi Technos Co., Ltd.
- anion exchange resin product name: Amberlite [registered trademark] 15 JWET, Organo Corporation 6 g was added and ion exchange treatment was performed at room temperature for 4 hours.
- the polymer obtained in this synthesis example corresponds to a copolymer of the additive according to the present invention, and has a nitrogen-containing heterocyclic ring protected with a tert-butoxycarbonyl group.
- the polymer obtained in this synthesis example is a copolymer having a nitrogen-containing heterocycle protected with a benzyloxycarbonyl group.
- Cation exchange resin product name: Dowex [registered trademark] 550A, Muromachi Technos Co., Ltd.
- anion exchange resin product name: Amberlite [registered trademark] 15 JWET, Organo Corporation
- the polymer obtained in this synthesis example is a copolymer and has a nitrogen-containing heterocycle not protected by a protecting group.
- Example 1 1.50 g of the polymer solution (resin binder) obtained in Synthesis Example 1 above, 0.17 g of the polymer solution (additive) obtained in Synthesis Example 4 above, tetramethoxymethylglycoluril (product name: POWDERLINK (registered trademark)) 1174, manufactured by Nippon Cytec Industries Co., Ltd.), 0.06 g, 5-sulfosalicylic acid 0.01 g, 29.85 g of propylene glycol monomethyl ether and 3.47 g of propylene glycol monoethyl ether were mixed and dissolved. A resist underlayer film forming composition was prepared.
- Example 2 1.50 g of the polymer solution (resin binder) obtained in Synthesis Example 1 above, 0.14 g of the polymer solution (additive) obtained in Synthesis Example 5 above, tetramethoxymethylglycoluril (product name: POWDERLINK [registered trademark]) 1174, manufactured by Nippon Cytec Industries, Ltd.), 0.06 g, 0.01 g of 5-sulfosalicylic acid, 29.88 g of propylene glycol monomethyl ether and 3.47 g of propylene glycol monoethyl ether were mixed and dissolved.
- a resist underlayer film forming composition was prepared.
- Example 3 1.50 g of the polymer solution (resin binder) obtained in Synthesis Example 1 above, 0.17 g of the polymer solution (additive) obtained in Synthesis Example 6 above, tetramethoxymethylglycoluril (product name: POWDERLINK [registered trademark]) 1174, manufactured by Nippon Cytec Industries Co., Ltd.), 0.06 g, 5-sulfosalicylic acid 0.01 g, 29.85 g of propylene glycol monomethyl ether and 3.47 g of propylene glycol monoethyl ether were mixed and dissolved. A resist underlayer film forming composition was prepared.
- Example 4 1.50 g of the polymer solution (resin binder) obtained in Synthesis Example 1 above, 0.19 g of the polymer solution (additive) obtained in Synthesis Example 7 above, tetramethoxymethylglycoluril (product name: POWDERLINK [registered trademark]) 1174, manufactured by Nippon Cytec Industries, Inc.), 0.06 g, 0.01 g of 5-sulfosalicylic acid, 29.83 g of propylene glycol monomethyl ether and 3.47 g of propylene glycol monoethyl ether were mixed and dissolved. A resist underlayer film forming composition was prepared.
- Example 5 1.50 g of the polymer solution (resin binder) obtained in Synthesis Example 1 above, 0.18 g of the polymer solution (additive) obtained in Synthesis Example 8 above, tetramethoxymethylglycoluril (product name: POWDERLINK [registered trademark]) 1174, manufactured by Nippon Cytec Industries Co., Ltd.), 0.06 g, 5-sulfosalicylic acid 0.01 g, propylene glycol monomethyl ether 29.84 g and propylene glycol monoethyl ether 3.47 g were mixed and dissolved. A resist underlayer film forming composition was prepared.
- Example 6 2.00 g of the polymer solution (resin binder) obtained in Synthesis Example 1 above, 0.24 g of the polymer solution (additive) obtained in Synthesis Example 9 above, tetramethoxymethylglycoluril (product name: POWDERLINK [registered trademark]) 1174, manufactured by Nippon Cytec Industries, Ltd.) 0.09 g, 5-sulfosalicylic acid 0.01 g, propylene glycol monomethyl ether 39.79 g and propylene glycol monoethyl ether 4.63 g were mixed and dissolved, A resist underlayer film forming composition was prepared.
- Example 7 1.50 g of the polymer solution (resin binder) obtained in Synthesis Example 1 above, 0.17 g of the polymer solution (additive) obtained in Synthesis Example 10 above, tetramethoxymethylglycoluril (product name: POWDERLINK [registered trademark]) 1174, manufactured by Nippon Cytec Industries Co., Ltd.), 0.06 g, 5-sulfosalicylic acid 0.01 g, 29.85 g of propylene glycol monomethyl ether and 3.47 g of propylene glycol monoethyl ether were mixed and dissolved. A resist underlayer film forming composition was prepared.
- a resist underlayer film forming composition was prepared by mixing and dissolving 0.01 g, propylene glycol monomethyl ether 36.96 g and propylene glycol monoethyl ether 4.29 g.
- This comparative example is an example not including the additive according to the present invention.
- This comparative example is an example including an additive not corresponding to the present invention.
- This comparative example is an example including an additive not corresponding to the present invention.
- a resist underlayer film was formed by spin-coating the underlayer film forming composition so as to have a film thickness of 10 nm and baking at 205 ° C. for 60 seconds.
- the resist underlayer film is spin-coated with a resist solution for ArF excimer laser (manufactured by JSR Corporation, product name: AR2772JN), baked at 110 ° C. for 90 seconds, and exposure apparatus for ArF excimer laser (Nikon Corporation) And NSR-S307E), which was exposed under predetermined conditions. After exposure, baking (PEB) was performed at 110 ° C. for 90 seconds, cooled to room temperature on a cooling plate, developed and rinsed, and a resist pattern was formed.
- ArF excimer laser manufactured by JSR Corporation, product name: AR2772JN
- the resist pattern dimensions (pattern collapse) at the maximum exposure dose (limit exposure dose) at which the resist pattern does not collapse
- the critical dimension was confirmed from the length measurement SEM.
- the additive according to the present invention it is possible to confirm whether or not a resist pattern can be prevented from collapsing in a high exposure region and a fine resist pattern can be formed.
- the cross-sectional shape of the resist pattern at the target line width of 80 nm line and space was confirmed by cross-sectional SEM.
- Table 1 below shows the pattern collapse critical dimension of the obtained resist pattern, the exposure amount at that time (limit exposure amount), and the results of the cross-sectional shape of the resist pattern. The smaller the pattern collapse limit dimension, the better.
- the tapered shape that increases the contact area between the resist pattern and the resist underlayer film can prevent the resist pattern from collapsing. That is, it was confirmed that the additive according to the present invention contained in the resist underlayer film forming compositions of Examples 1 to 7 has a useful effect for preventing the resist pattern from collapsing.
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Abstract
Description
GPCカラム:Shodex〔登録商標〕・Asahipak〔登録商標〕(昭和電工(株))
カラム温度:40℃
溶媒:N,N-ジメチルホルムアミド(DMF)
流量:0.6ml/分
標準試料:ポリスチレン(東ソー(株))
また、下記合成例2及び合成例3に示すエポキシ価は、三菱化学(株)製の自動滴定装置(製品名:GT-100)による測定結果であり、滴定液には0.1M過塩素酸-酢酸溶液を用いた。
1,4-テレフタル酸ジグリシジル(製品名:EX-711〔登録商標〕、ナガセケムテックス(株))14.00g、イソフタル酸8.08g、エチルトリフェニルホスホニウムブロマイド0.90g及びプロピレングリコールモノメチルエーテル91.94gを混合し、撹拌しながら4時間加熱還流することで、ポリマー溶液を得た。この溶液に陽イオン交換樹脂(製品名:ダウエックス〔登録商標〕550A、ムロマチテクノス(株))23g、陰イオン交換樹脂(製品名:アンバーライト〔登録商標〕15JWET、オルガノ(株))23gを加えて、室温で4時間イオン交換処理した。得られたポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量25000であった。本合成例で得られたポリマーは、本発明のレジスト下層膜形成組成物に含まれる樹脂バインダーに相当する。
アゾビスイソブチロニトリル2.67gにプロピレングリコールモノメチルエーテル152.44gを加え、80℃に昇温した。この加熱溶液中に、メタクリル酸グリシジル37.00g、メタクリル酸トリフルオロエチル10.94g及びプロピレングリコールモノメチルエーテル50.00gの混合溶液を少しずつ滴下し、80℃で17時間反応させることで、ポリマー溶液を得た。得られたポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量6200であり、このポリマー溶液のエポキシ価は1.04eq/kgであった。本合成例で得られたポリマーは、本発明に係る添加剤の共重合体を合成するための中間体に相当する。
アゾビスイソブチロニトリル2.89gにプロピレングリコールモノメチルエーテル168.86gを加え、80℃に昇温した。この加熱溶液中に、メタクリル酸グリシジル40.00g、メタクリル酸トリフルオロエチル11.83g及びプロピレングリコールモノメチルエーテル50.00gの混合溶液を少しずつ滴下し、80℃で14時間反応させることで、ポリマー溶液を得た。得られたポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量7000であり、このポリマー溶液のエポキシ価は0.88eq/kgであった。本合成例で得られたポリマーは、本発明に係る添加剤の共重合体を合成するための中間体に相当する。
上記合成例3で得られたポリマー溶液17.00g、N-(tert-ブトキシカルボニル)-L-グリシン2.63g、ベンジルトリエチルアンモニウムクロライド0.09g及びプロピレングリコールモノメチルエーテル7.36gを混合し、撹拌しながら14時間加熱還流することで、ポリマー溶液を得た。このポリマー溶液に陽イオン交換樹脂(製品名:ダウエックス〔登録商標〕550A、ムロマチテクノス(株))6g、陰イオン交換樹脂(製品名:アンバーライト〔登録商標〕15JWET、オルガノ(株))6gを加えて、室温で4時間イオン交換処理した。得られたポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量13600であった。本合成例で得られたポリマーは、本発明に係る添加剤の共重合体に相当し、tert-ブトキシカルボニル基で保護されたアミノ基を有する。
上記合成例3で得られたポリマー溶液16.50g、N-(tert-ブトキシカルボニル)-L-アラニン2.76g、ベンジルトリエチルアンモニウムクロライド0.08g及びプロピレングリコールモノメチルエーテル7.97gを混合し、撹拌しながら14時間加熱還流することで、ポリマー溶液を得た。このポリマー溶液に陽イオン交換樹脂(製品名:ダウエックス〔登録商標〕550A、ムロマチテクノス(株))6g、陰イオン交換樹脂(製品名:アンバーライト〔登録商標〕15JWET、オルガノ(株))6gを加えて、室温で4時間イオン交換処理した。得られたポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量13200であった。本合成例で得られたポリマーは、本発明に係る添加剤の共重合体に相当し、tert-ブトキシカルボニル基で保護されたアミノ基を有する。
上記合成例3で得られたポリマー溶液15.00g、N-(tert-ブトキシカルボニル)-L-ロイシン3.07g、ベンジルトリエチルアンモニウムクロライド0.08g及びプロピレングリコールモノメチルエーテル9.48gを混合し、撹拌しながら14時間加熱還流することで、ポリマー溶液を得た。このポリマー溶液に陽イオン交換樹脂(製品名:ダウエックス〔登録商標〕550A、ムロマチテクノス(株))6g、陰イオン交換樹脂(製品名:アンバーライト〔登録商標〕15JWET、オルガノ(株))6gを加えて、室温で4時間イオン交換処理した。得られたポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量13900であった。本合成例で得られたポリマーは、本発明に係る添加剤の共重合体に相当し、tert-ブトキシカルボニル基で保護されたアミノ基を有する。
上記合成例3で得られたポリマー溶液14.50g、N-(tert-ブトキシカルボニル)-L-メチオニン3.20g、ベンジルトリエチルアンモニウムクロライド0.07g及びプロピレングリコールモノメチルエーテル10.09gを混合し、撹拌しながら14時間加熱還流することで、ポリマー溶液を得た。このポリマー溶液に陽イオン交換樹脂(製品名:ダウエックス〔登録商標〕550A、ムロマチテクノス(株))6g、陰イオン交換樹脂(製品名:アンバーライト〔登録商標〕15JWET、オルガノ(株))6gを加えて、室温で4時間イオン交換処理した。得られたポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量20600であった。本合成例で得られたポリマーは、本発明に係る添加剤の共重合体に相当し、tert-ブトキシカルボニル基で保護されたアミノ基を有する。
上記合成例3で得られたポリマー溶液16.00g、N-(tert-ブトキシカルボニル)-L-セリン2.91g、ベンジルトリエチルアンモニウムクロライド0.08g及びプロピレングリコールモノメチルエーテル8.63gを混合し、撹拌しながら14時間加熱還流することで、ポリマー溶液を得た。このポリマー溶液に陽イオン交換樹脂(製品名:ダウエックス〔登録商標〕550A、ムロマチテクノス(株))6g、陰イオン交換樹脂(製品名:アンバーライト〔登録商標〕15JWET、オルガノ(株))6gを加えて、室温で4時間イオン交換処理した。得られたポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量15400であった。本合成例で得られたポリマーは、本発明に係る添加剤の共重合体に相当し、tert-ブトキシカルボニル基で保護されたアミノ基を有する。
上記合成例2で得られたポリマー溶液15.00g、N-(tert-ブトキシカルボニル)-L-プロリン3.37g、ベンジルトリエチルアンモニウムクロライド0.09g及びプロピレングリコールモノメチルエーテル12.70gを混合し、撹拌しながら15時間加熱還流することで、ポリマー溶液を得た。このポリマー溶液に陽イオン交換樹脂(製品名:ダウエックス〔登録商標〕550A、ムロマチテクノス(株))6g、陰イオン交換樹脂(製品名:アンバーライト〔登録商標〕15JWET、オルガノ(株))6gを加えて、室温で4時間イオン交換処理した。得られたポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量12300であった。本合成例で得られたポリマーは、本発明に係る添加剤の共重合体に相当し、tert-ブトキシカルボニル基で保護された含窒素複素環を有する。
上記合成例3で得られたポリマー溶液15.00g、trans-N-(tert-ブトキシカルボニル)-4-ヒドロキシ-L-プロリン3.07g、ベンジルトリエチルアンモニウムクロライド0.08g及びプロピレングリコールモノメチルエーテル9.47gを混合し、撹拌しながら14時間加熱還流することで、ポリマー溶液を得た。このポリマー溶液に陽イオン交換樹脂(製品名:ダウエックス〔登録商標〕550A、ムロマチテクノス(株))6g、陰イオン交換樹脂(製品名:アンバーライト〔登録商標〕15JWET、オルガノ(株))6gを加えて、室温で4時間イオン交換処理した。得られたポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量15200であった。本合成例で得られたポリマーは、本発明に係る添加剤の共重合体に相当し、tert-ブトキシカルボニル基で保護された含窒素複素環を有する。
上記合成例3で得られたポリマー溶液14.50g、N-カルボベンゾキシ-L-プロリン3.20g、ベンジルトリエチルアンモニウムクロライド0.07g及びプロピレングリコールモノメチルエーテル10.08gを混合し、撹拌しながら14時間加熱還流することで、ポリマー溶液を得た。このポリマー溶液に陽イオン交換樹脂(製品名:ダウエックス〔登録商標〕550A、ムロマチテクノス(株))6g、陰イオン交換樹脂(製品名:アンバーライト〔登録商標〕15JWET、オルガノ(株))6gを加えて、室温で4時間イオン交換処理した。得られたポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量12700であった。本合成例で得られたポリマーは、共重合体であって、ベンジルオキシカルボニル基で保護された含窒素複素環を有する。
上記合成例3で得られたポリマー溶液19.50g、L-ピログルタミン酸2.23g、ベンジルトリエチルアンモニウムクロライド0.10g及びプロピレングリコールモノメチルエーテル5.27gを混合し、撹拌しながら14時間加熱還流することで、ポリマー溶液を得た。このポリマー溶液に陽イオン交換樹脂(製品名:ダウエックス〔登録商標〕550A、ムロマチテクノス(株))6g、陰イオン交換樹脂(製品名:アンバーライト〔登録商標〕15JWET、オルガノ(株))6gを加えて、室温で4時間イオン交換処理した。得られたポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量13600であった。本合成例で得られたポリマーは、共重合体であって、保護基で保護されていない含窒素複素環を有する。
上記合成例1で得られたポリマー溶液(樹脂バインダー)1.50g、上記合成例4で得られたポリマー溶液(添加剤)0.17g、テトラメトキシメチルグリコールウリル(製品名:POWDERLINK〔登録商標〕1174、日本サイテックインダストリーズ(株)製)0.06g、5-スルホサリチル酸0.01g、プロピレングリコールモノメチルエーテル29.85g及びプロピレングリコールモノエチルエーテル3.47gを混合して溶解させることで、本発明のレジスト下層膜形成組成物を調製した。
上記合成例1で得られたポリマー溶液(樹脂バインダー)1.50g、上記合成例5で得られたポリマー溶液(添加剤)0.14g、テトラメトキシメチルグリコールウリル(製品名:POWDERLINK〔登録商標〕1174、日本サイテックインダストリーズ(株)製)0.06g、5-スルホサリチル酸0.01g、プロピレングリコールモノメチルエーテル29.88g及びプロピレングリコールモノエチルエーテル3.47gを混合して溶解させることで、本発明のレジスト下層膜形成組成物を調製した。
上記合成例1で得られたポリマー溶液(樹脂バインダー)1.50g、上記合成例6で得られたポリマー溶液(添加剤)0.17g、テトラメトキシメチルグリコールウリル(製品名:POWDERLINK〔登録商標〕1174、日本サイテックインダストリーズ(株)製)0.06g、5-スルホサリチル酸0.01g、プロピレングリコールモノメチルエーテル29.85g及びプロピレングリコールモノエチルエーテル3.47gを混合して溶解させることで、本発明のレジスト下層膜形成組成物を調製した。
上記合成例1で得られたポリマー溶液(樹脂バインダー)1.50g、上記合成例7で得られたポリマー溶液(添加剤)0.19g、テトラメトキシメチルグリコールウリル(製品名:POWDERLINK〔登録商標〕1174、日本サイテックインダストリーズ(株)製)0.06g、5-スルホサリチル酸0.01g、プロピレングリコールモノメチルエーテル29.83g及びプロピレングリコールモノエチルエーテル3.47gを混合して溶解させることで、本発明のレジスト下層膜形成組成物を調製した。
上記合成例1で得られたポリマー溶液(樹脂バインダー)1.50g、上記合成例8で得られたポリマー溶液(添加剤)0.18g、テトラメトキシメチルグリコールウリル(製品名:POWDERLINK〔登録商標〕1174、日本サイテックインダストリーズ(株)製)0.06g、5-スルホサリチル酸0.01g、プロピレングリコールモノメチルエーテル29.84g及びプロピレングリコールモノエチルエーテル3.47gを混合して溶解させることで、本発明のレジスト下層膜形成組成物を調製した。
上記合成例1で得られたポリマー溶液(樹脂バインダー)2.00g、上記合成例9で得られたポリマー溶液(添加剤)0.24g、テトラメトキシメチルグリコールウリル(製品名:POWDERLINK〔登録商標〕1174、日本サイテックインダストリーズ(株)製)0.09g、5-スルホサリチル酸0.01g、プロピレングリコールモノメチルエーテル39.79g及びプロピレングリコールモノエチルエーテル4.63gを混合して溶解させることで、本発明のレジスト下層膜形成組成物を調製した。
上記合成例1で得られたポリマー溶液(樹脂バインダー)1.50g、上記合成例10で得られたポリマー溶液(添加剤)0.17g、テトラメトキシメチルグリコールウリル(製品名:POWDERLINK〔登録商標〕1174、日本サイテックインダストリーズ(株)製)0.06g、5-スルホサリチル酸0.01g、プロピレングリコールモノメチルエーテル29.85g及びプロピレングリコールモノエチルエーテル3.47gを混合して溶解させることで、本発明のレジスト下層膜形成組成物を調製した。
上記合成例1で得られたポリマー溶液(樹脂バインダー)2.00g、テトラメトキシメチルグリコールウリル(製品名:POWDERLINK〔登録商標〕1174、日本サイテックインダストリーズ(株)製)0.09g、5-スルホサリチル酸0.01g、プロピレングリコールモノメチルエーテル36.96g及びプロピレングリコールモノエチルエーテル4.29gを混合して溶解させることで、レジスト下層膜形成組成物を調製した。本比較例は、本発明に係る添加剤を含まない例である。
上記合成例1で得られたポリマー溶液(樹脂バインダー)1.50g、上記合成例11で得られたポリマー溶液(添加剤)0.16g、テトラメトキシメチルグリコールウリル(製品名:POWDERLINK〔登録商標〕1174、日本サイテックインダストリーズ(株)製)0.06g、5-スルホサリチル酸0.01g、プロピレングリコールモノメチルエーテル29.86g及びプロピレングリコールモノエチルエーテル3.47gを混合して溶解させることで、レジスト下層膜形成組成物を調製した。本比較例は、本発明に該当しない添加剤を含む例である。
上記合成例1で得られたポリマー溶液(樹脂バインダー)1.50g、上記合成例12で得られたポリマー溶液(添加剤)0.18g、テトラメトキシメチルグリコールウリル(製品名:POWDERLINK〔登録商標〕1174、日本サイテックインダストリーズ(株)製)0.06g、5-スルホサリチル酸0.01g、プロピレングリコールモノメチルエーテル29.84g及びプロピレングリコールモノエチルエーテル3.47gを混合して溶解させることで、レジスト下層膜形成組成物を調製した。本比較例は、本発明に該当しない添加剤を含む例である。
窒素含有酸化珪素膜(SiON)が蒸着された(膜厚31.5nm)シリコンウエハー上に、本明細書の実施例1乃至実施例7、及び比較例1乃至比較例3で調製された各レジスト下層膜形成組成物を、膜厚10nmとなるようにスピンコートし、205℃で60秒間ベークすることにより、レジスト下層膜を形成した。そのレジスト下層膜上に、ArFエキシマレーザー用レジスト溶液(JSR(株)製、製品名:AR2772JN)をスピンコートし、110℃で90秒間ベークを行い、ArFエキシマレーザー用露光装置((株)ニコン製、NSR-S307E)を用い、所定の条件で露光した。露光後、110℃で90秒間ベーク(PEB)を行い、クーリングプレート上で室温まで冷却し、現像及びリンス処理をし、レジストパターンを形成した。
Claims (6)
- 下記式(1´)で表される構造単位と下記式(2)で表される構造単位を有する共重合体から成るレジスト下層膜形成組成物用添加剤。
- 請求項2に記載の前記共重合体は下記式(3)で表される構造単位をさらに有するレジスト下層膜形成組成物用添加剤。
- 樹脂バインダー、有機溶剤及び請求項1乃至請求項3のいずれか一項に記載のレジスト下層膜形成組成物用添加剤を含むリソグラフィー用レジスト下層膜形成組成物。
- さらに架橋剤及び架橋触媒を含む、請求項4に記載のリソグラフィー用レジスト下層膜形成組成物。
- 転写パターンを形成する加工対象膜を有する基板上に、請求項4又は請求項5に記載のレジスト下層膜形成組成物を塗布しベークしてレジスト下層膜を形成し、前記レジスト下層膜上にレジストを被覆し、前記レジストを被覆した基板にKrFエキシマレーザー、ArFエキシマレーザー、極端紫外線及び電子線からなる群から選択される放射線を照射し、その後現像してレジストパターンを形成し、前記レジストパターンをマスクとしてドライエッチングにより前記基板上にパターンを転写して半導体素子を作製する方法。
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US14/352,821 US9165782B2 (en) | 2011-10-20 | 2012-10-12 | Additive for resist underlayer film-forming composition and resist underlayer film-forming composition containing the same |
CN201280051419.9A CN103907060B (zh) | 2011-10-20 | 2012-10-12 | 形成抗蚀剂下层膜的组合物所用的添加剂及包含该添加剂的形成抗蚀剂下层膜的组合物 |
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TW201327058A (zh) | 2013-07-01 |
CN103907060B (zh) | 2018-05-01 |
US20140287589A1 (en) | 2014-09-25 |
KR20140092355A (ko) | 2014-07-23 |
US9165782B2 (en) | 2015-10-20 |
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CN103907060A (zh) | 2014-07-02 |
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