WO2002067309A1 - Pate a polir et procede de polissage d'un substrat - Google Patents
Pate a polir et procede de polissage d'un substratInfo
- Publication number
- WO2002067309A1 WO2002067309A1 PCT/JP2002/001483 JP0201483W WO02067309A1 WO 2002067309 A1 WO2002067309 A1 WO 2002067309A1 JP 0201483 W JP0201483 W JP 0201483W WO 02067309 A1 WO02067309 A1 WO 02067309A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polishing
- acid
- particles
- abrasive
- substrate
- Prior art date
Links
- 238000005498 polishing Methods 0.000 title claims abstract description 322
- 238000000034 method Methods 0.000 title claims abstract description 83
- 239000000758 substrate Substances 0.000 title claims abstract description 70
- 150000001875 compounds Chemical class 0.000 title claims abstract description 16
- 239000002245 particle Substances 0.000 claims abstract description 158
- -1 cerium halide Chemical class 0.000 claims abstract description 46
- 239000011163 secondary particle Substances 0.000 claims abstract description 32
- 239000004065 semiconductor Substances 0.000 claims abstract description 32
- 229910000420 cerium oxide Inorganic materials 0.000 claims abstract description 20
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 150000001785 cerium compounds Chemical class 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 9
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 5
- MMXSKTNPRXHINM-UHFFFAOYSA-N cerium(3+);trisulfide Chemical compound [S-2].[S-2].[S-2].[Ce+3].[Ce+3] MMXSKTNPRXHINM-UHFFFAOYSA-N 0.000 claims abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 99
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 90
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 47
- 239000003795 chemical substances by application Substances 0.000 claims description 46
- UNJPQTDTZAKTFK-UHFFFAOYSA-K cerium(iii) hydroxide Chemical group [OH-].[OH-].[OH-].[Ce+3] UNJPQTDTZAKTFK-UHFFFAOYSA-K 0.000 claims description 37
- 239000002270 dispersing agent Substances 0.000 claims description 33
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 28
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 28
- 238000002834 transmittance Methods 0.000 claims description 20
- 229910000000 metal hydroxide Inorganic materials 0.000 claims description 18
- 150000004692 metal hydroxides Chemical class 0.000 claims description 18
- 238000002360 preparation method Methods 0.000 claims description 18
- 150000003839 salts Chemical class 0.000 claims description 14
- 239000011164 primary particle Substances 0.000 claims description 13
- 239000012756 surface treatment agent Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 125000000129 anionic group Chemical group 0.000 claims description 7
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 7
- 239000003381 stabilizer Substances 0.000 claims description 7
- 150000002910 rare earth metals Chemical class 0.000 claims description 6
- 125000004429 atom Chemical group 0.000 claims description 5
- 239000012670 alkaline solution Substances 0.000 claims description 4
- 125000002091 cationic group Chemical group 0.000 claims description 4
- IVORCBKUUYGUOL-UHFFFAOYSA-N 1-ethynyl-2,4-dimethoxybenzene Chemical compound COC1=CC=C(C#C)C(OC)=C1 IVORCBKUUYGUOL-UHFFFAOYSA-N 0.000 claims description 3
- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 3
- 125000004430 oxygen atom Chemical group O* 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 239000002253 acid Substances 0.000 description 58
- 239000000725 suspension Substances 0.000 description 34
- 239000010410 layer Substances 0.000 description 30
- 239000007788 liquid Substances 0.000 description 26
- 230000003287 optical effect Effects 0.000 description 23
- 238000005406 washing Methods 0.000 description 23
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 21
- 235000011114 ammonium hydroxide Nutrition 0.000 description 21
- 239000006185 dispersion Substances 0.000 description 20
- 239000007864 aqueous solution Substances 0.000 description 16
- 238000005119 centrifugation Methods 0.000 description 15
- 230000008859 change Effects 0.000 description 14
- 239000000243 solution Substances 0.000 description 14
- 238000000926 separation method Methods 0.000 description 13
- 238000001132 ultrasonic dispersion Methods 0.000 description 13
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 12
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 12
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 12
- 229920002554 vinyl polymer Polymers 0.000 description 12
- 238000004438 BET method Methods 0.000 description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 11
- 230000007423 decrease Effects 0.000 description 11
- 239000002609 medium Substances 0.000 description 11
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 11
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 10
- 239000012528 membrane Substances 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- 239000010703 silicon Substances 0.000 description 10
- 229910052710 silicon Inorganic materials 0.000 description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 9
- 239000002002 slurry Substances 0.000 description 9
- 239000004372 Polyvinyl alcohol Substances 0.000 description 8
- 239000003082 abrasive agent Substances 0.000 description 8
- 229920002451 polyvinyl alcohol Polymers 0.000 description 8
- 239000000919 ceramic Substances 0.000 description 7
- 238000002955 isolation Methods 0.000 description 7
- 238000004062 sedimentation Methods 0.000 description 7
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000004518 low pressure chemical vapour deposition Methods 0.000 description 6
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 6
- 229910019142 PO4 Inorganic materials 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 239000010452 phosphate Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 4
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 4
- 239000002202 Polyethylene glycol Substances 0.000 description 4
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 4
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
- 235000011054 acetic acid Nutrition 0.000 description 4
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- KWIUHFFTVRNATP-UHFFFAOYSA-N glycine betaine Chemical compound C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 description 4
- WWZKQHOCKIZLMA-UHFFFAOYSA-N octanoic acid Chemical compound CCCCCCCC(O)=O WWZKQHOCKIZLMA-UHFFFAOYSA-N 0.000 description 4
- SIOXPEMLGUPBBT-UHFFFAOYSA-N picolinic acid Chemical compound OC(=O)C1=CC=CC=N1 SIOXPEMLGUPBBT-UHFFFAOYSA-N 0.000 description 4
- 238000007517 polishing process Methods 0.000 description 4
- 229920001223 polyethylene glycol Polymers 0.000 description 4
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 4
- WLJVXDMOQOGPHL-PPJXEINESA-N 2-phenylacetic acid Chemical compound O[14C](=O)CC1=CC=CC=C1 WLJVXDMOQOGPHL-PPJXEINESA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 229920002845 Poly(methacrylic acid) Chemical class 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 229910021485 fumed silica Inorganic materials 0.000 description 3
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 3
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 3
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 3
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000011550 stock solution Substances 0.000 description 3
- PUPZLCDOIYMWBV-UHFFFAOYSA-N (+/-)-1,3-Butanediol Chemical compound CC(O)CCO PUPZLCDOIYMWBV-UHFFFAOYSA-N 0.000 description 2
- KVGOXGQSTGQXDD-UHFFFAOYSA-N 1-decane-sulfonic-acid Chemical compound CCCCCCCCCCS(O)(=O)=O KVGOXGQSTGQXDD-UHFFFAOYSA-N 0.000 description 2
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 description 2
- LNETULKMXZVUST-UHFFFAOYSA-N 1-naphthoic acid Chemical compound C1=CC=C2C(C(=O)O)=CC=CC2=C1 LNETULKMXZVUST-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- GGHUPYLTAYIGHK-UHFFFAOYSA-N 2-benzoyloxypropanoic acid Chemical compound OC(=O)C(C)OC(=O)C1=CC=CC=C1 GGHUPYLTAYIGHK-UHFFFAOYSA-N 0.000 description 2
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 2
- SMNDYUVBFMFKNZ-UHFFFAOYSA-N 2-furoic acid Chemical compound OC(=O)C1=CC=CO1 SMNDYUVBFMFKNZ-UHFFFAOYSA-N 0.000 description 2
- SVTBMSDMJJWYQN-UHFFFAOYSA-N 2-methylpentane-2,4-diol Chemical compound CC(O)CC(C)(C)O SVTBMSDMJJWYQN-UHFFFAOYSA-N 0.000 description 2
- WHBMMWSBFZVSSR-UHFFFAOYSA-N 3-hydroxybutyric acid Chemical compound CC(O)CC(O)=O WHBMMWSBFZVSSR-UHFFFAOYSA-N 0.000 description 2
- REKYPYSUBKSCAT-UHFFFAOYSA-N 3-hydroxypentanoic acid Chemical compound CCC(O)CC(O)=O REKYPYSUBKSCAT-UHFFFAOYSA-N 0.000 description 2
- ALRHLSYJTWAHJZ-UHFFFAOYSA-N 3-hydroxypropionic acid Chemical compound OCCC(O)=O ALRHLSYJTWAHJZ-UHFFFAOYSA-N 0.000 description 2
- XHQZJYCNDZAGLW-UHFFFAOYSA-N 3-methoxybenzoic acid Chemical compound COC1=CC=CC(C(O)=O)=C1 XHQZJYCNDZAGLW-UHFFFAOYSA-N 0.000 description 2
- SJZRECIVHVDYJC-UHFFFAOYSA-N 4-hydroxybutyric acid Chemical compound OCCCC(O)=O SJZRECIVHVDYJC-UHFFFAOYSA-N 0.000 description 2
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- XXEYTIVCAPBAAY-UHFFFAOYSA-N CC1CCC2CC1(C2(C)C)N3C=CN=C3 Chemical compound CC1CCC2CC1(C2(C)C)N3C=CN=C3 XXEYTIVCAPBAAY-UHFFFAOYSA-N 0.000 description 2
- 239000005635 Caprylic acid (CAS 124-07-2) Substances 0.000 description 2
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 description 2
- YZGQDNOIGFBYKF-UHFFFAOYSA-N Ethoxyacetic acid Chemical compound CCOCC(O)=O YZGQDNOIGFBYKF-UHFFFAOYSA-N 0.000 description 2
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- 150000001298 alcohols Chemical class 0.000 description 2
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- 125000005037 alkyl phenyl group Chemical group 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
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- 239000011324 bead Substances 0.000 description 2
- UJMDYLWCYJJYMO-UHFFFAOYSA-N benzene-1,2,3-tricarboxylic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1C(O)=O UJMDYLWCYJJYMO-UHFFFAOYSA-N 0.000 description 2
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- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 2
- KHSBAWXKALEJFR-UHFFFAOYSA-H cerium(3+);tricarbonate;hydrate Chemical compound O.[Ce+3].[Ce+3].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O KHSBAWXKALEJFR-UHFFFAOYSA-H 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- PGRHXDWITVMQBC-UHFFFAOYSA-N dehydroacetic acid Chemical compound CC(=O)C1C(=O)OC(C)=CC1=O PGRHXDWITVMQBC-UHFFFAOYSA-N 0.000 description 2
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Chemical compound CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- TVIDDXQYHWJXFK-UHFFFAOYSA-N dodecanedioic acid Chemical compound OC(=O)CCCCCCCCCCC(O)=O TVIDDXQYHWJXFK-UHFFFAOYSA-N 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 239000001530 fumaric acid Substances 0.000 description 2
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Classifications
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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
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/20—Compounds containing only rare earth metals as the metal element
- C01F17/206—Compounds containing only rare earth metals as the metal element oxide or hydroxide being the only anion
- C01F17/224—Oxides or hydroxides of lanthanides
- C01F17/235—Cerium oxides or hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G25/00—Compounds of zirconium
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09G—POLISHING COMPOSITIONS; SKI WAXES
- C09G1/00—Polishing compositions
- C09G1/02—Polishing compositions containing abrasives or grinding agents
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1436—Composite particles, e.g. coated particles
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
- C09K3/1463—Aqueous liquid suspensions
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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
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/31051—Planarisation of the insulating layers
- H01L21/31053—Planarisation of the insulating layers involving a dielectric removal step
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
Definitions
- the present invention relates to a polishing slurry suitably used for a semiconductor element manufacturing technique and a method for polishing a substrate using the polishing slurry. Background art.
- CMP chemical mechanical polishing
- silica is used as abrasives of a chemical mechanical polishing agent for flattening an inorganic insulating film layer such as a silicon oxide insulating film formed by a method such as plasma CVD or low pressure CVD.
- system S i ⁇ 2
- particles of Se Li a system C e O 2
- a typical example of silica-based particles is fumed silica. Fumed silica is produced by dispersing particles grown by a method such as thermal decomposition of tetrachlorosilicic acid in a medium and then adjusting the pH.
- the polishing of an insulating film layer using a fumed silica abrasive has a disadvantage that the polishing rate is low.
- cerium-based particles A typical example of the cerium-based particles is cerium oxide. acid
- the most significant feature of ceramic fluoride abrasives is the high polishing rate that cannot be obtained with silica-based abrasives.
- Ceria-based compounds having a metal valency such as cerium oxide have chemically active properties, which are known as strong oxidizing agents. Therefore, the interaction of the chemical action as an oxidant and the mechanical removal action of the particles occurs. It is said that this produces a high polishing rate.
- Cerium oxide particles have a lower hardness than silicon particles and alumina particles, and are therefore less likely to scratch the polished surface, and thus are useful for finishing mirror polishing.
- Cerium oxide abrasives are used, for example, for polishing glass surfaces.
- the primary particles have a large particle size, and therefore, if the polishing is performed so that a sufficiently high polishing rate can be obtained.
- the surface of the insulating film has polishing scratches that can be visually observed. If the primary particle size is reduced, polishing scratches are less likely to form, but the polishing rate decreases.
- cerium oxide it is said that the processing proceeds by its chemical action and mechanical removal action by particles, and polishing damage is caused by the mechanical removal action by particles.
- a desired polishing rate and a concentration or density reduction of the abrasive grains that bring the surface state such as polishing flaws to a lower level are considered.
- the polishing rate is reduced, and it has been difficult to achieve both further improvement of the polishing rate and reduction of polishing scratches.
- a polishing agent that is free of polishing scratches and that can be polished at high speed is indispensable for improving the yield of semiconductor devices.
- a polishing agent having a large ratio between the polishing rate of the silicon oxide insulating film and the polishing rate of the silicon nitride insulating film is required.
- the pH of the abrasive changes over time, and there is a problem that the polishing rate is reduced due to the fluctuated pH.
- the present invention relates to a polishing agent which forms a chemical reaction layer with particles to be polished such as a silicon oxide insulating film and the like in a polishing agent, and can polish the layer while improving polishing speed and reducing polishing scratches. It is intended to provide a method for polishing a substrate using the same.
- polishing can be performed at high speed and with good reproducibility.
- polishing speed for silicon oxide film and silicon nitride film can be improved. It is characterized by a large ratio of degrees of dispersion, better dispersion of particles to reduce sedimentation and agglomeration, and easy detection and control of dispersibility by various optics.
- the present invention provides an abrasive to be used and a method for polishing a substrate using the abrasive. Disclosure of the invention
- a first invention of the present invention is an abrasive comprising particles and a medium in which at least a part of the particles are dispersed,
- the particles are selected from cerium oxide, cerium octalogenide, and cerium sulfide, have a density of 3 to 6 g / cm 3 , and have an average secondary particle size of 1 to 30.
- the present invention relates to an abrasive which is at least one of a cerium compound having a thickness of 0 nm and a metal hydroxide of tetravalent.
- the specific surface area of the particles is preferably 50 m 2 Zg or more, and the average particle size of the primary particles is preferably 50 nm or less.
- the particles are tetravalent metal hydroxide, and this average particle diameter of the secondary particles is 3 0 0 nm or less, the particle density is 3 ⁇ 6 g / cm 3 der
- the secondary particles have an average particle size of 1 to 300 nm, the particles are at least one of rare earth metal hydroxide and zirconium hydroxide, and the rare earth metal hydroxide is cerium hydroxide. It is preferable that the particles be a tetravalent metal hydroxide obtained by mixing a tetravalent metal salt and an alkali solution.
- the pH of the abrasive is 3 to 9 and the abrasive medium Is preferably water, the abrasive contains a pH stabilizer, the dispersant is included, and the surface treatment agent is preferably included.
- the pH stabilizer is composed of one or more components, and the pKa value of at least one component is within 1.0 unit from the abrasive pH. Is preferred.
- the dispersant is preferably selected from a water-soluble anionic dispersant, a water-soluble cationic dispersant, a water-soluble nonionic dispersant, and a water-soluble amphoteric dispersant.
- the polishing surface treating agent is preferably a compound containing at least one atom having an unpaired electron in its molecular structure, or a compound containing at least one of a nitrogen atom and an oxygen atom in its molecular structure.
- the ratio of the polishing rate of the silicon oxide insulating film to the polishing rate of the silicon nitride insulating film by the polishing agent is preferably 5 or more.
- the light transmittance of light having a wavelength of 500 nm is 10% or more. It is preferable that the difference in the light transmittance at the subsequent wavelength of 500 to 700 nm is 20% or less.
- the electric conductivity of the abrasive is 30 mS / cm or less, and that the particles have a positive zero potential.
- a second invention of the present invention relates to a substrate polishing method for polishing a substrate with the polishing slurry according to any one of the first inventions.
- polishing the substrate with a polishing pad having a Shore D hardness of 50 or more polishing the substrate during the semiconductor element manufacturing process, and polishing the silicon oxide film formed on the substrate. are each preferred.
- the polishing agent contains particles of tetravalent metal hydroxide so that the silicon oxide insulating film has a polishing speed of 200 to 200 nm / min. It is preferable to polish with.
- the polishing agent and the substrate polishing method of the present invention as described above, it is possible to polish a surface to be polished such as a silicon oxide insulating film at high speed without any damage.
- the polishing rate of the silicon oxide insulating film is set sufficiently higher than the polishing rate of the silicon nitride insulating film, so that the silicon oxide insulating film can be selectively polished. Process management becomes easier.
- an abrasive with good particle dispersibility can be obtained, the dispersion stability of the abrasive can be evaluated numerically, and the polishing end point, particle concentration in the abrasive, particle diameter, etc. can be detected by various optical methods. Control becomes possible. BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is a schematic diagram showing an example of an embodiment of the present invention using a CMP device.
- FIG. 2 is a schematic cross-sectional view showing an example of a polishing process of a semiconductor substrate to which the present invention can be applied.
- FIG. 2 (a) shows a step in which a trench is formed in a silicon substrate
- FIG. The step (c) of embedding the silicon oxide film in the trench groove of ()) is the step of element isolation by polishing the silicon oxide film of (b).
- the particles contained in the abrasive of the present invention are: (1) selected from cerium oxide, cerium halide and cerium sulfide, having a density of 3 g / cm 3 or more and 6 g / cm 3 or less; And the average size of the secondary particles is Particles of a cerium compound having a diameter of 1 nm or more and 300 nm or less, (2) particles of a tetravalent metal hydroxide are used, and the particles (1) and (2) are either May be used, or both may be used in combination.
- the (1) cerium compound in the present invention is selected from one or more of cerium oxide, cerium oxide, cerium oxide, and cerium sulfide, and is selected from cerium oxide in that a practical polishing rate can be obtained. Umm is preferred.
- the content of alkaline metal and halogens in the cerium compound is preferably 10 ppm or less.
- a method of mixing a tetravalent metal salt with an alkaline solution can be used.
- This method is described, for example, in the science of rare earths (edited by Ginya Adachi, Kagaku Doujin) at pages 304 to 305.
- a tetravalent metal salts for example M (S 0 4) 2, M (NH 4) 2 (N0 3) have M (NH 4) 4 (S 0 4) 4 (although, M represents a rare earth element .), arbitrary preferred is Z r (S 0 4) 2 ⁇ 4 H 2 0.
- chemically active salts of Ce are more preferred.
- ammonia water, potassium hydroxide, and sodium hydroxide can be used, and ammonia water is preferably used.
- the particulate tetravalent metal hydroxide synthesized by the above method can be washed to remove metal impurities.
- a method of repeating solid-liquid separation several times by centrifugation or the like can be used.
- the tetravalent metal hydroxide it is preferable to use at least one of a rare earth metal hydroxide and zirconium hydroxide.
- a rare earth metal hydroxide cerium hydroxide is more preferable.
- At least a part, and preferably all, of the tetravalent metal hydroxide particles and the cerium compound particles obtained by washing as described above are placed in a liquid medium. By dispersing the slurry, a slurry can be produced.
- a homogenizer, an ultrasonic disperser, a pole mill, or the like is used in addition to the dispersion treatment using a normal stirrer. be able to.
- the abrasive of the present invention the slurry of particles and a medium at least partially dispersed therein may be used as it is, but a dispersant, a polished surface treatment agent, a PH stabilizer, An abrasive or the like may be added as appropriate to form an abrasive. These may be added to the medium before the dispersion or after the dispersion.
- the average value of the specific surface area of the primary particles of the abrasive (hereinafter referred to as the specific surface area of the particles) is 50 m 2 Zg or more. It is preferable to have one. Further, it is preferably at most 500 m 2 / g.
- Yo Ri preferably 8 0 ⁇ 5 0 0 m 2 Z g, further rather then favored Ri 1 0 0-3 5 0 11 2 Roh Dea, is rather particular preferred 1 5 0 to 2 5 0 m 2 Z g It is.
- the specific surface area can be measured by the BET method using nitrogen adsorption (for example, product name “Auto Soap” or “Product name Auto Scrub-1” manufactured by Kontaku Ichim Co.). Here, the measurement sample is pretreated at 150 ° C.
- the average value of the particle size of the secondary particles of the particles dispersed in the abrasive (hereinafter, referred to as the average particle size of the secondary particles) is preferably 300 nm or less. It is more preferably from 2 to 200 nm, more preferably from 10 to 200 nm, and most preferably from 50 to 150 nm. In particular, in the case of (1) cerium compound particles, the average particle size of the secondary particles needs to be 1 to 300 nm. If it is smaller than 1 nm, the polishing rate tends to be low.
- the particles in the abrasive must have a chemical effect on the film to be polished, if the specific surface area is less than 50 m 2 / g, the contact area with the film to be polished will be small, and the polishing rate will be low. descend. In addition, the flatness of the secondary particles If the average particle size is larger than 300 nm, the contact area with the film to be polished also becomes small, and the polishing rate decreases.
- the primary particles refer to, for example, particles of the smallest unit corresponding to crystallites surrounded by grain boundaries observed when observed in a powder state by a transmission electron microscope (TEM) or the like.
- secondary particles refer to a lump in which the primary particles are aggregated.
- the particle size of the secondary particles is measured by a photon correlation method. For example, it can be measured with a Malpan equipment name: Zetasizer 3000HS or a Coulter equipment name: Cole Yuichi N4SD.
- the average particle size of the primary particles of the particles is preferably 50 nm or less, more preferably 0.1 to 50 nm, further preferably 1 to 30 nm, and particularly preferably 1 to 30 nm. 3 to: L 0 nm is preferred.
- TEM transmission electron microscope
- the particles of the cerium compound need to be 3 g / cm 3 or more and 6 g / cm 3 or less.
- Particle density is gas It is measured by a replacement method (for example, Kantachrome Measuring Equipment: Product name Ultra-Pycnometer 100,000).
- the pH of the abrasive is preferably 3 or more and 9 or less, more preferably 5 or more and 8 or less, and particularly preferably 5.5 or more and 7 or less. If the pH is less than 3, the chemical acting force is reduced, and the polishing rate is reduced. If the pH is greater than 9, the secondary particle diameter will increase, and the polishing rate will decrease.
- a medium used as a dispersion medium of particles in addition to water, a medium selected from the following group is preferable.
- the pH stabilizer contained in the abrasive of the present invention includes, for example, a mixture of a carboxylic acid and a salt thereof, a mixture of a phosphoric acid and a salt thereof, a mixture of a boric acid and a salt thereof, and a mixture of an amine and a salt thereof.
- the pH buffer may be appropriately selected from those conventionally used as a pH buffer.
- the pH stabilizer consists of one or more constituents, at least one of which has a pKa value within 1.0 unit of the abrasive pH. It is in.
- the polishing agent pH when adjusting the polishing agent pH from 5.0 to 6.0, phosphoric acid, acetic acid, propionic acid, malonic acid, succinic acid, daltaric acid, adipic acid, maleic acid, fumaric acid, Phthalic acid, cunic acid, ethylenediamine, pyridine, 2—Amino bilidine, 3—Amino viridine, xanthosine, toluidine, picolinic acid, histidine, piperazine, N—methylpyrazine, 2—bis (2—hydroxyxethyl) amino 2 — (Hydroxymethyl) — 1, 3 — Mixtures of propanediol, uric acid, etc., and their respective salts are preferably used.
- the pH tends to increase over a long period of storage, and the polishing rate decreases.
- This pKa value is more preferably within 0.5 units of the abrasive pH, more preferably within 0.2 units.
- the abrasive of the present invention preferably contains a dispersant.
- the dispersant may be any compound that acts on particles in the abrasive to reduce sedimentation and maintain dispersibility. By including a dispersant in the abrasive, the polishing speed and the flatness of the surface to be polished can be controlled, and the occurrence of polishing scratches can be suppressed.
- the dispersant is preferably selected from a water-soluble anionic dispersant, a water-soluble non-ionic dispersant, a water-soluble cationic dispersant, and a water-soluble amphoteric dispersant. Two or more dispersants, including at least one, may be used.
- water-soluble anionic dispersant examples include triethanolamine lauryl sulfate, ammonium lauryl sulfate, and polyoxyethylene alkyl ether sulfate triethanolamine. Further, an anion-based water-soluble polymer described later may be used.
- water-soluble nonionic dispersant examples include polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene higher alcohol ether, Polyoxyethylene octyl phenyl ether, Polyethylene Nonylphenyl ether, polyoxyalkylene alkyl ether, polyoxyethylene derivative, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene zolebitan Tristearate, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan trioleate, polyoxyethylene sorbite tetraolate, polyethylene glycol monolaurate, poly Ethylene glycol monostearate, polyethylene glycol distearate, poly (ethylene glycol) monooleate, polyoxyethylene alkylamine, polyoxyethylene cured castor Oil, alkyl alkanol amide
- water-soluble cationic dispersant examples include coconut amine acetate, stearyl amine acetate and the like.
- water-soluble amphoteric dispersing agent examples include lauryl betaine, stearyl betaine, lauryl dimethyl amine oxide, 2-alkyl-1-N-potoxymethyl N-hydroxyl-imidazonium Betaine and the like.
- One or more dispersants are selected and added.
- the amount of these dispersants added is 0.01 to 100 parts by weight per 100 parts by weight of the particles, because of the dispersibility and prevention of sedimentation and the relationship with abrasive flaws. Is preferred. It is more preferably 0.1 to 100 parts by weight, and even more preferably 1 to 100 parts by weight.
- the molecular weight of the dispersant is preferably from 100 to 5, 000, 0000, and More preferably, it is 1, 000 to 500, 000, and even more preferably, it is 10, 000 to 100, 0000. If the molecular weight of the dispersant is less than 100, a sufficient polishing rate cannot be obtained when polishing a silicon oxide film or a silicon nitride film, and the molecular weight of the dispersant exceeds 5,000, 000 In such a case, the viscosity increases, and the storage stability of the abrasive may decrease.
- the abrasive of the present invention preferably contains an agent for treating a surface to be polished.
- the polished surface treatment agent may be a compound having an atom or a structure capable of forming a hydrogen bond with a hydroxyl group present on the surface of the polished surface.
- the surface treatment agent to be polished is preferably a compound containing at least one atom having an unpaired electron in the molecular structure, or a compound containing at least one of a nitrogen atom and an oxygen atom in the molecular structure.
- the ratio between the polishing rate of the silicon oxide insulating film and the polishing rate of the silicon nitride insulating film can be increased, which is suitable for isolation between shear-wrench elements.
- polypinyl acetal polyvinyl formal, polyvinyl butyral, polyvinyl pyrrolidone, polyvinyl pyridone-iodine complex, poly pinyl (5-methyl-2-pyrrolidinone), poly vinyl (2—piveridinone), polyvinyl (3,3,5-trimethyl-2-pyrrolidinone), poly (N—pinylcarbazole), poly (N—alkyl-12—biercarbazolyl), Poly (N-alkyl_3—pinylcarbazol), Poly (N—alkyl-4-vinylcarbazole), Poly (N—pinyl-3,6-dicarbose), Polyvinylphenol , Polyvinyl acetate phenone, poly (4-vinyl pyridin), poly (4-1 / 3-hydroxyshethyl pyridine), poly ( 2-vinyl pyridine), poly (2-/ 3-vinyl pyridine), poly (4-vinyl pyridine), poly
- N-vinylimidazole poly (N-vinylimidazole), poly (N-vinylimidazole), poly (N-pinylimidazole), poly (41-vinylimidazole), poly (5-vinylimidazole), poly (1 1-vinyl—4—methyloxazolidinone), polypynylacetamide, polyvinylmethylacetamide, polyvinylethylacetamide, polyvinylphenylacetamide, polyphenylmethylpropionamide polyvinylethylpropionamide, polypinylmethylisobutyramide Methylbenzylamide, poly (meth) acrylic acid, poly (meth) acrylic acid derivative, poly (meth) acrylic acid ammonium salt, polyvinyl alcohol, polyvinyl alcohol derivative, polyacryl Ray , Poly accession Li Roni Application Benefits Le, polyvinyl acetate, Po Li (vinyl acetate - c 0 - main Tak Li Le methyl), polyvin
- a compound containing a soluble organic compound (where M is H, NH 4 , or an alkali metal atom) (hereinafter referred to as an anionic additive) can also be used.
- anionic additive examples include formic acid, acetic acid, propionic acid, butyric acid, valeric acid, cabronic acid, enanthic acid, caprylic acid, pelargonic acid, caprylic acid, pendecanoic acid, lauric acid, tridecanoic acid, mystilin Acid, pendecanoic acid, palmitic acid, heptadecanoic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, cyclohexanecarboxylic acid, phenylacetic acid, benzoic acid, o — Toluic acid, m—Toluic acid, ⁇ —Toluic acid, o—Methoxy benzoic acid, m—Methoxy benzoic acid, p—Methoxy benzoic acid, Acrylic acid, Methacrylic acid, Crotonic acid, Pentenoic acid, hexenoic acid, heptenoic acid
- methanesulfonic acid ethanesulfonic acid, propanesulfonic acid, butanesulfonic acid, pentanesulfonic acid, hexanesulfonic acid, heptanesulfonic acid, octanesulfonic acid, nonanesulfonic acid, decanesulfonic acid, and decanesulfonic acid Acids, dodecanesulfonic acid, tridecanesulfonic acid, tetradecanesulfonic acid, pentadecanesulfonic acid, hexadecansulfonic acid, heptanedecanesulfonic acid, octadecansulfonic acid, benzenesulfonic acid, naphtha Sulfonic acids such as tarensulfonic acid, toluenesulfonic acid, hydroxyethanesulfonic acid, hydroxyphenolsulfonic acid, and anthras
- N-acylamino acid such as N-acyl-N-methylglycine, N-acyl-N-methyl-jS-alanine, N-acylglutamic acid, polyoxyethylene alkyl ether carboxylic acid, acylation Peptide, alkylbenzene sulfonic acid, linear alkyl benzene sulfonic acid, alkyl naphthalene sulfonic acid, naphthalene sulfonic acid formalin polycondensate, melamin sulfonic acid formalin polycondensate, dialkyl sulfocono, succinate, sulfosuccinic acid Alkyl, boroxyethylenealkylsulfosuccinic acid, alkylsulfoacetic acid, ⁇ -olefin sulfonic acid, polymethyltaurine, dimethyl-5-sulfoysophthalate, sulfated oil, higher alcohol sulfate
- polymaleic acid such as polymaleic acid, polyaspartic acid, carboxymethylcellulose, or alginic acid, or a derivative thereof.
- anionic additives may be used as they are, but may also be used as salts of alkaline metals such as Na and K, and salts such as ammonia.
- polyvinyl alcohol and its derivatives it is preferable to be selected from polyvinyl alcohol and its derivatives, polyvinyl alcohol-based copolymers and its derivatives.
- derivatives of polyvinyl alcohol and polypinyl alcohol are preferably used.
- a polyvinyl alcohol copolymer containing vinyl alcohol (A) and any one of vinyl acetate, vinyl formal, vinyl acetal, vinyl amine, vinyl isoptyl ether and vinyl pyrrolidone (B) as a constituent component are also preferably used. More preferred are polyvinyl alcohol and polyvinyl pyrrolidone.
- the surface treatment agent to be polished is selected from one or more kinds and added.
- the amount of the surface treating agent to be polished is not particularly limited. However, from the viewpoint of the dispersibility of the particles in the abrasive and the prevention of sedimentation, 0.01 to 1 part by weight of the particles is used. , 000 parts by weight are preferred. More preferably, it is from 1 to 300 parts by weight, and even more preferably from 10 to 100 parts by weight.
- the molecular weight thereof is preferably 100 to 5,000, 000, 0000 in average molecular weight, and 1, 000 to 500, 000 in average. 0 is more preferred, and 100,000 to 100,000 is more preferred. If the polishing agent has a molecular weight of less than 100, a sufficient polishing rate cannot be obtained when polishing a silicon oxide film or a silicon nitride film, and the polishing agent has a molecular weight of 5.0 or less. If it exceeds 0,000, the viscosity may increase, and the storage stability of the abrasive may decrease. Further, the abrasive of the present invention preferably satisfies at least one of the following two conditions with respect to the light transmittance at a wavelength of 500 to 70 Onm and the difference of the light transmittance with time.
- the first condition is that when the above particles are contained in the abrasive at 0.2% by weight, the light transmittance of the abrasive at a wavelength of 50 Onm is 10% or more. Here, 20% or more is more preferable, and 30% or more is even more preferable.
- the second condition is that the difference between the light transmittance of the abrasive at a wavelength of 500 to 700 nm and the value immediately after preparation of the abrasive after 24 hours of standing is 20% or less. is there. Here, 10% or less is more preferable, and 5% or less is even more preferable. If the difference between the values after standing for 24 hours exceeds 20%, the dispersion stability may be reduced. For example, if the light transmittance of a certain abrasive at a wavelength of 500 nm is 22.3% immediately after preparation and 24.7% after 24 hours of standing, the difference is 2.4%.
- the light transmittance of the abrasive can be measured using light having a wavelength of 500 to 700 nm, for example, with a spectrophotometer U-3410 manufactured by Hitachi, Ltd. If the abrasive contains more than 0.2% by weight of particles and the above light transmittance is 10% or more, it will be 10% or more even if it is 0.2% by weight.
- a dispersing agent is added to the polishing agent, and the polishing agent is subjected to ultrasonic dispersion treatment, preferably twice or more. For example, filtering through a membrane filter of about / zm can be mentioned.
- Abrasives having a low light transmittance of less than 10% and abrasives having a large difference in the light transmittance described above tend to sediment the particles and are difficult to handle. Also, the probability of occurrence of polishing scratches increases. Furthermore, if the light transmittance is low, detection and controllability by various optics (polishing end point detection and control, particle concentration in abrasives) Is bad.
- the particle concentration in the abrasive is not particularly limited, but is preferably 0.01 to 5% by weight from the viewpoint of easy handling of the abrasive.
- the electrical conductivity of the abrasive is preferably 30 mS / cm or less. In general, it is difficult to set the electric conductivity to 0, more preferably 0.01 to 10 mS / cm, and still more preferably 0.01 to 3 mS / cm. Preferred.
- the electric conductivity can be measured using, for example, a model number CM-20 measuring device manufactured by Toa Electronics Co., Ltd. When the electric conductivity exceeds 30 mS / cm, the particles tend to aggregate and the ratio of settling particles increases.
- an abrasive having an electric conductivity of 30 mS / cm or less for example, in the step of mixing a tetravalent metal salt for producing metal hydroxide particles and an alkaline solution, the concentration of the tetravalent metal salt, the pH of the mixed solution is not too high, and the like.
- the zeta potential of the particles dispersed in the abrasive is preferably positive.
- the zeta potential is not particularly limited, if it is about 80 mV or less, it is sufficient for ordinary polishing. Further, it is more preferably at least 10 mV, more preferably at least 20 mV.
- the zeta potential can be measured, for example, by the laser Doppler method (for example, Malvern's device name: ZERO ONE SIZER 3000HS). If the zeta potential is 0 mV or less, the polishing rate decreases. This is probably because the chemical action of the particles in the abrasive becomes smaller.
- the polishing method of the present invention comprises polishing the substrate with the polishing agent of the present invention. And features.
- the substrate a substrate in the process of manufacturing a semiconductor element is preferably used. Further, it is preferable to polish the silicon oxide film formed on the substrate.
- a silicon oxide film or a silicon oxide film and a silicon nitride film on a semiconductor substrate such as a semiconductor substrate in which circuit elements and wiring patterns are formed, and a semiconductor substrate in which circuit elements are formed
- a substrate on which a film is formed can be used.
- a holder for holding the semiconductor substrate and a polishing pad (polishing cloth) are attached, and a motor whose rotation speed can be changed is mounted.
- a general polishing apparatus having a polishing platen can be used.
- FIG. 1 shows a schematic diagram of an example of an embodiment of the present invention using a CMP apparatus.
- the structure of the apparatus shown in FIG. 1 is based on the polishing pad of the present invention containing particles and a medium from a polishing agent supply mechanism 15 on a polishing pad 17 stuck on a polishing table 18.
- Supply 1 6 6.
- the semiconductor substrate 13 on which the silicon oxide insulating film 14 is formed is attached to the wafer holder 11 and fixed by the retainer 12.
- the polished surface of the silicon oxide insulating film 14 is brought into contact with the polishing pad 17, and the polished surface and the polishing pad are moved relative to each other. It is designed to rotate and perform CMP polishing.
- polishing pad 17 on the polishing table 18 general nonwoven fabric, foamed polyurethane, porous fluororesin, or the like can be used, and there is no particular limitation. Further, it is preferable that the polishing pad be subjected to groove processing so that the polishing agent 16 is stored.
- the polishing conditions are not limited, but the rotation speed of the polishing platen is preferably as low as 100 rpm or less so that the semiconductor substrate 13 does not pop out.
- the pressing pressure (working load) of the semiconductor substrate 13 having the silicon oxide insulating film 14 to be polished on the polishing pad 17 is 10 kPa to 100 kPa (1 kPa).
- the polishing pad 17 is continuously supplied with the polishing agent 16 of the present invention by a polishing agent supply mechanism 15 such as a pump.
- the supply mechanism and supply amount are not particularly limited, but it is preferable that the surface of the polishing pad is always covered with the abrasive.
- the polishing pad for polishing the substrate preferably has a Shore D hardness of 50 or more.
- the polishing pad preferably has a Shore D hardness of 55 to 99, more preferably 60 to 95. If the pad hardness is less than 50, the mechanical action of the pad is reduced, and the polishing rate is reduced. In addition, the Sho-D hardness does not become a value of 100 or more from the definition, and if it is too hard, a polished surface may be damaged.
- the pad's Shore D hardness can be measured with a Shore D hardness tester (for example, ASKAR Rubber Hardness Tester, High Polymer Instruments Co., Ltd.).
- the polishing pad having a Shore D hardness of 50 or more may be either a foamed body or a non-foamed body such as cloth or non-woven fabric, and the polishing pad may be made of polyurethane or acrylic.
- Ril, polyester, and acrylyl monoester Coalescence, Polytetrafluoroethylene, Polypropylene, Polyethylene, Polymethylpentene, Cellulose, Cellulose Ester, Polyamides such as Nylon and Alamide, Polyimide, Polyimide Resins such as midamide, polysiloxane copolymer, oxylan compound, phenolic resin, polystyrene, polyacrylonitrile and epoxy resin can be used.
- unevenness due to minute projections is formed on the polishing pad surface. Further, various types of groove processing may be performed.
- the area of the upper surface of the convex portion is preferably 0.25 mm 2 or less, more preferably 100 m 2 or more and 0.25 mm 2 or less. . If it is larger than 0.25 mm 2 , the polishing rate is reduced, and if it is smaller than 100 m 2 , it is difficult to form minute unevenness.
- the height of the microscopic protrusions is small.
- the variation in height (1 ⁇ / average height) is preferably less than 10%. If the variation in height (1 ⁇ / average height) exceeds 10%, small protrusions that do not contact the film to be polished on the substrate will occur during polishing, and the stability of polishing characteristics will be poor.
- the average height of the fine projections is preferably 1 zm or more and 200 m or less. If it is larger than 200 m, the polishing liquid will flow too much and the polishing speed will decrease. On the other hand, if it is smaller than 1 m, the polished surface and the upper surface of the fine projections are attracted to each other, preventing smooth polishing. Examples of the shape of the minute projection include a pyramid, a cone, a prism, a cylinder, and a hemisphere, and are not particularly limited. Further, it is preferable that the average pitch of the fine projections is not less than 30 m and not more than 100 jm. If it is smaller than 30 m, the gap between the projections is too narrow, causing clogging due to polishing debris. Also, 1 0 0 0 If it is larger than im, the number of minute projections in contact with the polished surface is small, and the polishing rate is reduced.
- Examples of a method for manufacturing a pad having minute projections include an embossing roll method, a metal molding method, and a transfer method. Among these, a transfer method in which a mold having minute unevenness is transferred with a photocurable resin is used. Is preferred.
- the photocurable resin composition used for the photocurable resin layer is not particularly limited.
- the polishing pad When the polishing pad is formed in a belt shape, the pad having a web-like shape is preferable.
- the polishing pad in this form is, for example, a photo-curable resin formed on the surface by transferring microscopic projections from a mold by photo-curing on a support layer of biaxially stretched polyethylene terephthalate.
- a photo-curable resin formed on the surface by transferring microscopic projections from a mold by photo-curing on a support layer of biaxially stretched polyethylene terephthalate.
- One having a layer is exemplified.
- the polishing method of polishing with a polishing pad having a Shore D hardness of 50 or more is applicable not only to polishing of a silicon oxide film or the like but also to polishing of a metal film such as copper or aluminum formed on a semiconductor substrate. Is also good.
- a silicon oxide insulating film for example, a silicon oxide film or a silicon oxide film and a silicon nitride film is formed while supplying the polishing agent to the polishing pad on the polishing platen.
- the surface to be polished of the semiconductor substrate and the polishing pad be moved relative to each other for polishing.
- the polishing may be performed by rotating or swinging the holder 1 in addition to rotating the polishing platen.
- a polishing method in which a polishing platen is rotated in a planetary manner a polishing method in which a belt-shaped polishing pad is linearly moved in one direction in a longitudinal direction, and the like are exemplified.
- the holder may be fixed, rotating, or swinging.
- the polishing rate of the silicon oxide insulating film is 20%. It is preferable that the polishing is performed so as to be not less than 0 nm Z min and not more than 2000 nm / min. In particular, it is preferable to perform such polishing using an abrasive containing particles of tetravalent metal hydroxide.
- polishing pad conditioning step before polishing the substrate by CMP.
- polishing is performed with a liquid containing at least water using a dresser with diamond particles. Subsequently, the polishing step according to the present invention is performed, and
- FIG. 2 are schematic cross-sectional views showing an example of a polishing step of a semiconductor substrate to which the present invention can be applied.
- (a) is a stage where a trench is formed in a silicon substrate
- (b) is a stage where a silicon oxide film is buried in the trench of (a)
- (c) is a silicon oxide of (b).
- the film is polished to separate the elements.
- a silicon oxide film 3 and a silicon nitride film 2 are formed as shown in FIG. 2 (b) in which a silicon oxide film 3 is buried in a trench of a silicon substrate 1 in FIG. 2 (a).
- the silicon oxide film 3 is polished to the underlying silicon nitride film 2 while eliminating the unevenness of the silicon oxide film 3. Only the silicon oxide film 3 buried in the element isolation part is left (see Fig. 2 (c)). At this time, if the polishing rate ratio between the silicon oxide and the silicon nitride serving as the stopper is large, the polishing process margin becomes large.
- the silicon oxide insulating film and the silicon nitride insulating film are formed by the method of the present invention.
- the ratio of the polishing rate of the silicon oxide film to the polishing rate of the silicon nitride film is preferably 5 or more.
- the polishing rate ratio is more preferably 15 or more and 300 or less, and even more preferably 30 or more and 100 or less.
- the polishing agent contains the above-mentioned polishing agent
- the silicon oxide film is negatively charged in the neutral pH range
- the silicon nitride film has a potential of 0. Is selectively adsorbed on the silicon nitride film, thereby more effectively functioning as a stopper film, obtaining the preferable polishing rate ratio as described above, and facilitating the polishing process management.
- the abrasive when the abrasive contains a dispersant, it is adsorbed by the particles in the abrasive, and the steric stabilizing action can improve the dispersion stability.
- a silicon wrench isolation was formed on the silicon substrate, an aluminum oxide wiring layer was formed thereon, and an aluminum wiring was formed thereon.
- the film is flattened again by the above polishing method.
- a second layer of aluminum wiring is formed on the flattened silicon oxide insulating film layer, and a silicon oxide insulating film is formed again between the wirings and on the wiring, and then the insulating film is formed by the above-described polishing method.
- the unevenness of the film surface can be eliminated, and a smooth surface can be obtained over the entire surface of the semiconductor substrate.
- Examples of a method for manufacturing an inorganic insulating film to which the present invention can be applied include a low-pressure CVD method and a plasma CVD method.
- a low-pressure CVD method By silicon oxide insulation film forming the low pressure CVD method, S i source and to monosilane:. S i H 4, oxygen Source and to oxygen: 0 2 is used. Resulting Ri by the and this to perform S 1 1 ⁇ 4 - ⁇ 2 based oxidation reaction this with 4 0 0 ° C about the following low temperature.
- Plasma CVD has the advantage that chemical reactions that require high temperatures can be performed at low temperatures under normal thermal equilibrium.
- the substrate temperature is preferably in the range of 250 ° C. to 400 ° C.
- the reaction pressure is preferably in the range of 67 to 400 Pa.
- the element such as phosphorus or boron may be doped in the silicon oxide insulating film.
- the plasma CVD method includes SiH 4 —NH 3 gas using SiH 4 as a Si source and NH 3 as a nitrogen source.
- the substrate temperature is preferably from 300 to 400 ° C.
- the polishing agent and the polishing method according to the present invention are not limited to a silicon oxide film formed on a semiconductor substrate, a silicon nitride film formed on a wiring board having predetermined wiring, glass, silicon nitride, or the like.
- Optical glass such as insulating films, photomasks, lenses and prisms, inorganic conductive films such as IT, optical integrated circuits composed of glass and crystalline materials, optical switching elements, optical waveguides, and optical fibers.
- Single crystal for optics such as end face, Shinchile, solid-state laser single crystal, LED surfer for blue laser
- the present invention is applied to polishing a semiconductor substrate such as a magnetic substrate, a semiconductor single crystal such as SiC, GaP, and GaAs, a glass substrate for a magnetic disk, a magnetic head, and the like. Polishing agent and polishing method may be applied to metal film
- the specific surface area of the obtained particles measured by the BET method was 200 m 2 Z g.
- the particles (160 g) and pure water (15840 g) were mixed, subjected to ultrasonic dispersion, and further filtered through a 1 m membrane filter to obtain an abrasive having a solid content of 1% by weight. .
- the average particle size of the secondary particles was 170 nm, and the abrasive pH was 5.4.
- a silicon oxide insulating film is formed by TEOS-plasma CVD method on the holder of the polishing device to which the suction pad for attaching the substrate is attached.
- a 200 mm silicon wafer was set. Place the holder with the insulating film surface down on a surface plate of a ⁇ 600 mm polishing machine to which a pad made of porous urethane resin is attached, and further apply a processing load of 30 kP. a (306 gf / cm 2 ). While the above-mentioned abrasive (solid content: 1% by weight) was dropped at a rate of 200 cc / min on the surface plate, the surface plate and the wafer were rotated at 50 rpm for 2 minutes to polish the insulating film. .
- the polished wafer was thoroughly washed with pure water and then dried.
- the silicon oxide insulating film was 800 nm (polishing rate: 400 nm / min) by this polishing.
- the surface of the insulating film was observed using an optical microscope, no clear polishing scratch was observed.
- silicon oxide was produced in the same manner as in Example 1.
- the silicon oxide insulating film was polished, dried, and washed, and the change in film thickness before and after polishing was measured.
- the silicon oxide insulating film was polished to 144 nm (polishing speed: il Sn mZm in).
- polishing speed: il Sn mZm in was measured.
- the silicon oxide insulating film was polished, dried, and washed in the same manner as in Example 2 using the polishing agent prepared by the above method, and as a result, the silicon oxide insulating film was 800 nm (polishing rate: 401 nm / min) Polished. Further, no clear polishing flaw was observed on the surface of the silicon oxide insulating film.
- polishing, washing, and drying of the silicon oxide insulating film were performed in the same manner as in Example 2 using the abrasive prepared by the above method.
- the silicon oxide insulating film was polished at 560 nm (polishing rate: 280 nm Zmin). In addition, no clear polishing flaw was observed on the surface of the silicon oxide insulating film.
- the silicon oxide insulating film was polished, washed and dried in the same manner as in Example 1.
- the silicon oxide film was reduced by 800 nm (polishing speed: 400 nm mZmin) by this polishing.
- polishing speed 400 nm mZmin
- cerium hydroxide particles The concentration of cerium hydroxide particles was adjusted to 0.2% with water, the pH was adjusted to 6 by adding ammonia water (25% aqueous solution), and the mixture was subjected to ultrasonic dispersion treatment. An abrasive was obtained by filtration through a 1 m membrane filter. The average particle size of the secondary particles of this abrasive was measured by a photon correlation method and found to be 100 nm.
- the platen and wafer are each rotated at 75 rpm
- the silicon oxide insulating film was polished, washed and dried in the same manner as in Example 1 except that the film was rotated for 2 minutes.
- the silicon oxide film decreased by 104 nm (polishing rate: 520 nm / min) by this polishing. did.
- the surface of the insulating film was observed using an optical microscope, no clear polishing scratch was observed.
- the pH was adjusted to 5.4 by adding commercially available nitric acid. Thereafter, the resultant was subjected to ultrasonic dispersion and further filtered through a membrane filter (1) to obtain an abrasive.
- the average particle size of the secondary particles of the abrasive was measured by photon correlation method and found to be 170 nm.
- the abrasive pH after storage at room temperature for 4 months was 5.3.
- the silicon oxide insulating film was polished, washed and dried in the same manner as in Example 1 using the above-mentioned abrasive (solid content: 1% by weight).
- the change in film thickness of the film insulation was 800 nm (polishing rate: 400 nm / min).
- Example 7 After mixing 16 g of the particles obtained in Example 7 and 144 g of pure water, the pH was adjusted to 5.4 with commercially available aqueous ammonia. Thereafter, the resultant was subjected to ultrasonic dispersion, and further filtered through a 1; m filter to obtain an abrasive.
- the specific surface area of the particles measured in the same manner as in Example 8 was 200 m 2 / g, and the average particle size of the secondary particles was 200 nm. After storing this abrasive at room temperature for 4 months, the pH of the abrasive dropped to 4.5.
- the specific surface area of the particles in the suspension of ceramic hydroxide obtained after washing was measured by the BET method, and was found to be 200 m2 ng.
- 16 g of particles in a suspension of cerium hydroxide, 1.5 g of polyoxyethylene octylamine (number-average molecular weight: 10,000, 000) and 144 g of pure water were mixed, Dispersion was applied. Thereafter, 3 g of linoleic acid was added, and the pH was adjusted to 5.4 with commercially available aqueous ammonia. After further ultrasonic dispersion, the resultant was filtered through a 1 / xm membrane filter to obtain an abrasive.
- the average particle size of the secondary particles of the obtained abrasive was measured by a photon correlation method and found to be 11'5 nm.
- the silicon oxide insulating film was polished, washed, and dried in the same manner as in Example 1 using the abrasive (solid content: 1% by weight) prepared above.
- the silicon oxide film was found to have a thickness of 760 nm (polishing rate: 380 nm / min) by this polishing. Showed a decrease.
- the surface of the polished silicon oxide insulating film was observed using an optical microscope, no clear polishing flaw was observed.
- the silicon oxide insulating film was polished, washed and dried in the same manner as in Example 1 using the polishing agent (solid content: 1% by weight) prepared above.
- a ⁇ 200 mm silicon wafer on which a silicon nitride insulating film was formed by low-pressure CVD was prepared and polished similarly.
- the silicon nitride insulating film was 20 nm (polishing speed: 10 nm) / min).
- the polishing speed ratio between the silicon oxide insulating film and the silicon nitride insulating film was 40.
- the surfaces of the polished silicon oxide insulating film and the silicon nitride insulating film were observed using an optical microscope, no clear polishing scratches were observed.
- polyvinyl alcohol instead of polyvinyl alcohol, polyvinylpyrrolidone (number-average molecular weight of about 20,000) was used, and polyoxyethylene octylamine (number-average molecular weight of about 100,000) was added.
- An abrasive was prepared in the same manner as in Example 10 except that 5 g was added. The specific surface area of the particles in this abrasive is 220 m 2 Zg, and the average of the secondary particles is The particle size was 125 nm.
- a silicon oxide film formed by the TE ⁇ S—CVD method and a silicon nitride insulating film formed by the low-pressure CVD method were polished on the surface of the silicon wafer in the same manner as in Example 10. went.
- the silicon oxide insulating film was polished at 760 nm (polishing rate: 380 nm / min), and the silicon nitride insulating film was polished at 22 nm (polishing rate: lln mZmin).
- the concentration of cerium hydroxide particles was adjusted to 1.3% with water, subjected to ultrasonic dispersion treatment, and further filtered through a membrane filter to obtain an abrasive.
- the average particle size of the secondary particles of this abrasive was measured by a photon correlation method and found to be 105 nm.
- the light transmittance of this abrasive was 22.3%, 49.5%, 68, and 5% for wavelengths of 500 nm, 600 nm, and 700 nm, respectively. Furthermore, the light transmittance after 24 hours of standing was 24.7%, 53.9%, and 73.7% for wavelengths of 500 nm, 600 nm, and 700 nm, respectively (difference in difference). Minutes are 2.4%, 4.4%, and 5.2%).
- the silicon oxide insulating film was polished, washed, and dried in the same manner as in Example 1 except that the platen and the wafer were each rotated at 75 rpm for 2 minutes using the above-mentioned abrasive.
- the silicon oxide film was reduced by 840 nm (polishing speed: 420 nm / min) by this polishing.
- polishing speed 420 nm / min
- the specific surface area of the cerium hydroxide particles in the suspension obtained after washing was measured by the BET method, it was 18 Om Vg.
- the concentration of the ceramic hydroxide particles was adjusted to 0.2% with water, subjected to ultrasonic dispersion treatment, and further filtered through a 1 ⁇ m membrane filter to obtain an abrasive.
- the average particle size of the secondary particles of this abrasive was measured by a photon correlation method and found to be 210 nm. '
- the light transmittance of this polishing agent was 14.4%, 32.7%, and 48. 1% at wavelengths of 500 nm and 600 nm, respectively. After 24 hours of standing, the light transmittance was 500 nm, 600 nm, and 700 nm. They were 24.1%, 47.9%, and 65.2%, respectively (the differences were 9.7%, 15.2%, and 17.1%, respectively).
- the silicon oxide insulating film was polished, washed, and dried in the same manner as in Example 12 except that the above-mentioned abrasive was used.
- the silicon oxide film was reduced by 800 nm (polishing rate: 400 nm / min) by this polishing.
- polishing rate 400 nm / min
- the concentration of cerium hydroxide particles was adjusted to 0.2% with water, the pH was adjusted to 5.5 with ammonia water (25% aqueous solution), and ultrasonic dispersion treatment was performed.
- the mixture was filtered through a 1 ⁇ methylene filter to obtain an abrasive.
- the average particle size of the secondary particles of this abrasive was measured by a photon correlation method and found to be 130 nm.
- the electrical conductivity of this abrasive was measured using a model number CM-20 measuring device manufactured by Toa Electronics. The conductivity was 0.5 mS / cm, and the laser potential of the cerium hydroxide particles measured using a laser Doppler method manufactured by Malvern using a Zetasizer-13000HS was measured. 35 mV. No aggregation or sedimentation was observed.
- the silicon oxide insulating film was polished, washed, and dried in the same manner as in Example 1 except that the platen and the wafer were each rotated at 75 rpm for 2 minutes using the above-mentioned abrasive.
- the silicon oxide film was reduced by 880 nm (polishing speed: 44 nm / min) by this polishing.
- the surface of the insulating film was observed using an optical microscope, no clear polishing scratch was observed.
- cerium carbonate hydrate 2 kg was calcined at 800 ° C to obtain cerium oxide.
- Cerium oxide and pure water were mixed and ground and dispersed by a bead mill. Thereafter, the mixture was filtered with a 1 m membrane filter to obtain a dispersion.
- the particle density was 7.0 g / cm 3 , and the specific surface area was 280 m 2 Z g.
- the particle concentration in the dispersion was adjusted to 1.0 wt% pH to 9.1 to obtain an abrasive.
- the average particle size of the secondary particles measured by the photon correlation method using this stock solution of the abrasive was 200 nm.
- cerium carbonate hydrate 2 kg was calcined at 350 ° C to obtain cerium oxide.
- Cerium oxide and pure water were mixed and ground and dispersed by a bead mill. After that, the mixture was filtered with a 1 m filter, and an abrasive was obtained.
- the particle density was 7.0 g / cm 3 and the specific surface area was 200 m 2 Z g.
- the abrasive was obtained by adjusting the particle concentration in the dispersion to 1.0 wt% pH to 7.9.
- the average particle size of the secondary particles measured by the photon correlation method was 320 nm.
- Silicon oxide insulating film is 10
- the polishing agent and the substrate polishing method according to the present invention can be used in the step of flattening the substrate surface by CMP, in particular, the step of flattening the interlayer insulating film, the step of forming a shear wrench element isolation, and the like. Suitable for
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JP2002566539A JPWO2002067309A1 (ja) | 2001-02-20 | 2002-02-20 | 研磨剤及び基板の研磨方法 |
US10/467,864 US6786945B2 (en) | 2001-02-20 | 2002-02-20 | Polishing compound and method for polishing substrate |
EP02700629A EP1369906B1 (en) | 2001-02-20 | 2002-02-20 | Polishing compound and method for polishing substrate |
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JP2001-350598 | 2001-11-15 | ||
JP2001350598 | 2001-11-15 | ||
JP2001-378838 | 2001-12-12 | ||
JP2001378838 | 2001-12-12 | ||
JP2001-400866 | 2001-12-28 | ||
JP2001400882 | 2001-12-28 | ||
JP2001400872 | 2001-12-28 | ||
JP2001-400876 | 2001-12-28 | ||
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JP2001400876 | 2001-12-28 | ||
JP2001400888 | 2001-12-28 | ||
JP2001-400891 | 2001-12-28 | ||
JP2001400866 | 2001-12-28 | ||
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KR20020086953A (ko) | 2002-11-20 |
EP1369906A1 (en) | 2003-12-10 |
EP1369906B1 (en) | 2012-06-27 |
KR100512134B1 (ko) | 2005-09-02 |
JP4941430B2 (ja) | 2012-05-30 |
JPWO2002067309A1 (ja) | 2004-06-24 |
CN1746255A (zh) | 2006-03-15 |
US20040065022A1 (en) | 2004-04-08 |
CN1290162C (zh) | 2006-12-13 |
EP2418258A1 (en) | 2012-02-15 |
US6786945B2 (en) | 2004-09-07 |
JP2009010402A (ja) | 2009-01-15 |
CN1457506A (zh) | 2003-11-19 |
CN1746255B (zh) | 2010-11-10 |
EP1369906A4 (en) | 2009-07-15 |
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