WO2013133198A1 - 研磨用組成物、及び当該研磨用組成物を用いた化合物半導体基板の製造方法 - Google Patents
研磨用組成物、及び当該研磨用組成物を用いた化合物半導体基板の製造方法 Download PDFInfo
- Publication number
- WO2013133198A1 WO2013133198A1 PCT/JP2013/055801 JP2013055801W WO2013133198A1 WO 2013133198 A1 WO2013133198 A1 WO 2013133198A1 JP 2013055801 W JP2013055801 W JP 2013055801W WO 2013133198 A1 WO2013133198 A1 WO 2013133198A1
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- WO
- WIPO (PCT)
- Prior art keywords
- polishing
- polishing composition
- acid
- abrasive grains
- compound semiconductor
- Prior art date
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- 238000005498 polishing Methods 0.000 title claims abstract description 191
- 239000000203 mixture Substances 0.000 title claims abstract description 95
- 239000000758 substrate Substances 0.000 title claims abstract description 77
- 239000004065 semiconductor Substances 0.000 title claims abstract description 43
- 150000001875 compounds Chemical class 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 238000000034 method Methods 0.000 title description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims description 68
- 239000006061 abrasive grain Substances 0.000 claims description 57
- 239000007800 oxidant agent Substances 0.000 claims description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 17
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000003002 pH adjusting agent Substances 0.000 claims description 10
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 8
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 8
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 6
- 229910003460 diamond Inorganic materials 0.000 claims description 5
- 239000010432 diamond Substances 0.000 claims description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 4
- 229910000423 chromium oxide Inorganic materials 0.000 claims description 4
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 4
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 4
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 22
- 229910010271 silicon carbide Inorganic materials 0.000 description 22
- 238000009826 distribution Methods 0.000 description 11
- 239000002253 acid Substances 0.000 description 9
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- 229910002601 GaN Inorganic materials 0.000 description 6
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 6
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 6
- 239000003795 chemical substances by application Substances 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
- 230000000052 comparative effect Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 239000002585 base Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 230000001590 oxidative effect Effects 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
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- 230000003993 interaction Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- -1 transition metal salt Chemical class 0.000 description 4
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- 150000007513 acids Chemical class 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- KHIWWQKSHDUIBK-UHFFFAOYSA-N periodic acid Chemical compound OI(=O)(=O)=O KHIWWQKSHDUIBK-UHFFFAOYSA-N 0.000 description 3
- 229910052594 sapphire Inorganic materials 0.000 description 3
- 239000010980 sapphire Substances 0.000 description 3
- 239000011550 stock solution Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910052723 transition metal Inorganic materials 0.000 description 3
- SMNDYUVBFMFKNZ-UHFFFAOYSA-N 2-furoic acid Chemical compound OC(=O)C1=CC=CO1 SMNDYUVBFMFKNZ-UHFFFAOYSA-N 0.000 description 2
- IHCCAYCGZOLTEU-UHFFFAOYSA-N 3-furoic acid Chemical compound OC(=O)C=1C=COC=1 IHCCAYCGZOLTEU-UHFFFAOYSA-N 0.000 description 2
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 2
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 2
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 2
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 2
- 235000011054 acetic acid Nutrition 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 2
- 235000015165 citric acid Nutrition 0.000 description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000002296 dynamic light scattering Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- CHTHALBTIRVDBM-UHFFFAOYSA-N furan-2,5-dicarboxylic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)O1 CHTHALBTIRVDBM-UHFFFAOYSA-N 0.000 description 2
- MNWFXJYAOYHMED-UHFFFAOYSA-N heptanoic acid Chemical compound CCCCCCC(O)=O MNWFXJYAOYHMED-UHFFFAOYSA-N 0.000 description 2
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 2
- FGKJLKRYENPLQH-UHFFFAOYSA-N isocaproic acid Chemical compound CC(C)CCC(O)=O FGKJLKRYENPLQH-UHFFFAOYSA-N 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 150000007522 mineralic acids Chemical class 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- WWZKQHOCKIZLMA-UHFFFAOYSA-N octanoic acid Chemical compound CCCCCCCC(O)=O WWZKQHOCKIZLMA-UHFFFAOYSA-N 0.000 description 2
- 235000005985 organic acids Nutrition 0.000 description 2
- 235000006408 oxalic acid Nutrition 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- WLJVNTCWHIRURA-UHFFFAOYSA-N pimelic acid Chemical compound OC(=O)CCCCCC(O)=O WLJVNTCWHIRURA-UHFFFAOYSA-N 0.000 description 2
- 238000007517 polishing process Methods 0.000 description 2
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000011975 tartaric acid Substances 0.000 description 2
- 235000002906 tartaric acid Nutrition 0.000 description 2
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 2
- LSGOVYNHVSXFFJ-UHFFFAOYSA-N vanadate(3-) Chemical compound [O-][V]([O-])([O-])=O LSGOVYNHVSXFFJ-UHFFFAOYSA-N 0.000 description 2
- OBETXYAYXDNJHR-SSDOTTSWSA-M (2r)-2-ethylhexanoate Chemical compound CCCC[C@@H](CC)C([O-])=O OBETXYAYXDNJHR-SSDOTTSWSA-M 0.000 description 1
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
- RBNPOMFGQQGHHO-UHFFFAOYSA-N -2,3-Dihydroxypropanoic acid Natural products OCC(O)C(O)=O RBNPOMFGQQGHHO-UHFFFAOYSA-N 0.000 description 1
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 description 1
- OXQGTIUCKGYOAA-UHFFFAOYSA-N 2-Ethylbutanoic acid Chemical compound CCC(CC)C(O)=O OXQGTIUCKGYOAA-UHFFFAOYSA-N 0.000 description 1
- WLAMNBDJUVNPJU-UHFFFAOYSA-N 2-methylbutyric acid Chemical compound CCC(C)C(O)=O WLAMNBDJUVNPJU-UHFFFAOYSA-N 0.000 description 1
- CVKMFSAVYPAZTQ-UHFFFAOYSA-N 2-methylhexanoic acid Chemical compound CCCCC(C)C(O)=O CVKMFSAVYPAZTQ-UHFFFAOYSA-N 0.000 description 1
- MLMQPDHYNJCQAO-UHFFFAOYSA-N 3,3-dimethylbutyric acid Chemical compound CC(C)(C)CC(O)=O MLMQPDHYNJCQAO-UHFFFAOYSA-N 0.000 description 1
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- 239000005711 Benzoic acid Substances 0.000 description 1
- RBNPOMFGQQGHHO-UWTATZPHSA-N D-glyceric acid Chemical compound OC[C@@H](O)C(O)=O RBNPOMFGQQGHHO-UWTATZPHSA-N 0.000 description 1
- QEVGZEDELICMKH-UHFFFAOYSA-N Diglycolic acid Chemical compound OC(=O)COCC(O)=O QEVGZEDELICMKH-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 229910001860 alkaline earth metal hydroxide Inorganic materials 0.000 description 1
- OBETXYAYXDNJHR-UHFFFAOYSA-N alpha-ethylcaproic acid Natural products CCCCC(CC)C(O)=O OBETXYAYXDNJHR-UHFFFAOYSA-N 0.000 description 1
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 description 1
- 229940121375 antifungal agent Drugs 0.000 description 1
- 239000003429 antifungal agent Substances 0.000 description 1
- 235000010233 benzoic acid Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
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- 239000008139 complexing agent Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
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- 238000001879 gelation Methods 0.000 description 1
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- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
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- 239000001630 malic acid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- RMIODHQZRUFFFF-UHFFFAOYSA-N methoxyacetic acid Chemical compound COCC(O)=O RMIODHQZRUFFFF-UHFFFAOYSA-N 0.000 description 1
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- 150000007530 organic bases Chemical class 0.000 description 1
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- 230000003647 oxidation Effects 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 description 1
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- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 1
- 229960004889 salicylic acid Drugs 0.000 description 1
- 239000011163 secondary particle Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- CMZUMMUJMWNLFH-UHFFFAOYSA-N sodium metavanadate Chemical compound [Na+].[O-][V](=O)=O CMZUMMUJMWNLFH-UHFFFAOYSA-N 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 description 1
- UJJLJRQIPMGXEZ-UHFFFAOYSA-N tetrahydro-2-furoic acid Chemical compound OC(=O)C1CCCO1 UJJLJRQIPMGXEZ-UHFFFAOYSA-N 0.000 description 1
- UAXOELSVPTZZQG-UHFFFAOYSA-N tiglic acid Natural products CC(C)=C(C)C(O)=O UAXOELSVPTZZQG-UHFFFAOYSA-N 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 229910001428 transition metal ion Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 229940005605 valeric acid Drugs 0.000 description 1
- 239000000052 vinegar Substances 0.000 description 1
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- 229910000166 zirconium phosphate Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
- B24B37/042—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor
- B24B37/044—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor characterised by the composition of the lapping agent
-
- 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
- H01L21/02002—Preparing wafers
- H01L21/02005—Preparing bulk and homogeneous wafers
- H01L21/02008—Multistep processes
- H01L21/0201—Specific process step
- H01L21/02024—Mirror polishing
-
- 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
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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
- H01L21/30625—With simultaneous mechanical treatment, e.g. mechanico-chemical polishing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/16—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic Table
- H01L29/1608—Silicon carbide
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/20—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only AIIIBV compounds
- H01L29/2003—Nitride compounds
Definitions
- the present invention relates to a polishing composition used for polishing a polishing object made of a compound semiconductor, and a method for producing a compound semiconductor substrate using the polishing composition.
- a compound semiconductor is a semiconductor composed of a plurality of elements.
- a compound semiconductor containing silicon carbide, gallium nitride, gallium arsenide, or the like is known.
- a compound semiconductor substrate containing silicon carbide or gallium nitride is used as a material for manufacturing an LED or a power device.
- various polishing compositions are used (see, for example, Patent Documents 1 and 2).
- silicon carbide and gallium nitride have excellent corrosion resistance against acids and alkalis, that is, high chemical stability, and the second highest hardness after diamond. Therefore, much time is required for polishing the compound semiconductor substrate containing silicon carbide or gallium nitride. Therefore, an important point in the polishing composition used for polishing the compound semiconductor substrate is to realize a high polishing rate.
- the polishing rate is improved by incorporating an oxidizing agent such as orthoperiodic acid or metaperiodic acid and colloidal silica abrasive grains into the polishing composition for a silicon carbide substrate.
- the polishing rate is improved by incorporating an oxidizing agent such as tungstate or molybdate, an oxygen donor, abrasive grains, and a pH adjuster in the polishing composition.
- the oxidant is a transition metal salt
- the transition metal element can take a plurality of oxidation numbers, so that the valence of the oxidant changes in the oxidation reaction.
- the oxygen donor can maintain the high oxidizing power of the oxidizing agent by returning the changed valence of the oxidizing agent to the original value.
- an increase in polishing rate is provided.
- the present inventor is a polishing composition containing abrasive grains and water, wherein 50% by mass or more of the abrasive grains is composed of particles A having a particle diameter of 40 nm to 80 nm, and the abrasive grains. It has been found that a polishing rate for a compound semiconductor substrate can be increased by a polishing composition comprising 10% by mass or more of particles B having a particle diameter of 150 nm to 300 nm.
- An object of the present invention is to provide a polishing composition capable of polishing a compound semiconductor substrate, particularly a compound semiconductor substrate having a high hardness (for example, a Vickers hardness of 1,500 Hv or more) at a high polishing rate.
- a further object of the present invention is to provide a method for producing a compound semiconductor substrate using the polishing composition.
- a polishing composition containing abrasive grains and water, wherein 50% by mass or more of the abrasive grains is composed of particles A having a particle diameter of 40 nm or more and 80 nm or less, and 10% by mass of the abrasive grains. %, A polishing composition comprising particles B having a particle diameter of 150 nm or more and 300 nm or less is provided.
- the abrasive grains are preferably at least one selected from silicon oxide, aluminum oxide, zirconium oxide, titanium oxide, manganese oxide, iron oxide, chromium oxide and diamond.
- the polishing composition preferably further contains an oxidizing agent, and preferably further contains a pH adjuster.
- a method for producing a compound semiconductor substrate comprising a polishing step of polishing the compound semiconductor substrate using the polishing composition.
- a compound semiconductor substrate particularly a high-hardness compound semiconductor substrate having a Vickers hardness of 1,500 Hv or more can be polished at a high polishing rate.
- the polishing composition is used for polishing a compound semiconductor substrate in a manufacturing process of the compound semiconductor substrate.
- the compound semiconductor substrate to be polished is a substrate made of a semiconductor composed of a plurality of elements. Examples of the material constituting the compound semiconductor include silicon carbide, gallium nitride, and gallium arsenide.
- the polishing composition of the present embodiment is particularly suitable for use in polishing a compound semiconductor substrate having a high hardness (for example, a Vickers hardness of 1,500 Hv or more), specifically, a compound semiconductor substrate made of silicon carbide or gallium nitride. Can be used.
- the polishing composition contains abrasive grains and water, and preferably further contains components such as an oxidizing agent and a pH adjuster.
- the polishing composition is prepared by mixing each component such as abrasive grains with water.
- the abrasive grains function to physically polish the surface of the compound semiconductor substrate.
- the abrasive grains include particles made of silicon oxide, aluminum oxide, zirconium oxide, cerium oxide, titanium oxide, manganese oxide, iron oxide, chromium oxide, diamond, and the like.
- particles made of silicon oxide or aluminum oxide are preferable, and particles made of silicon oxide are particularly preferable.
- the particles made of silicon oxide include silica particles selected from colloidal silica, fumed silica, and sol-gel silica. Of these particles, colloidal silica is particularly preferable.
- these abrasive grains one kind may be used alone, or two or more kinds may be used in combination.
- the particle shape of the abrasive grains is preferably a shape close to a true sphere.
- the average value of the major axis / minor axis ratio of the particles is preferably 1.2 or less, and more preferably 1.1 or less.
- the major axis / minor axis ratio can be determined using, for example, an electron microscope image of abrasive grains. Specifically, in a scanning electron microscope image of a predetermined number (eg, 200) of particles, a minimum circumscribed rectangle is drawn for each particle. Next, for each minimum circumscribed rectangle, the length of the long side (the value of the major axis) is divided by the length of the short side (the value of the minor axis), and the average value thereof is calculated to obtain the major axis / minor axis The average value of the ratio can be determined. Calculation of the average value of the major axis / minor axis ratio based on such image analysis processing can be performed using general image analysis software.
- the abrasive grains are contained so as to have a specific particle size distribution. Specifically, among all the abrasive grains contained in the polishing composition, the ratio of particles A (small particles) having a particle diameter of 40 nm or more and 80 nm or less on a mass basis is 50% or more. The ratio of particles B (large particles) having a diameter of 150 nm to 300 nm is 10% or more. Furthermore, among all the abrasive grains contained in the polishing composition, the total of the particles A and the particles B is 60% or more, preferably 80% or more, based on mass. By using abrasive grains having the above particle size distribution, a high polishing rate can be obtained when polishing a compound semiconductor substrate.
- the above particle diameter is the aggregate particle diameter (secondary particle diameter) of the abrasive grains.
- the particle size distribution can be measured, for example, by a dynamic light scattering method using UPA-EX250 manufactured by Nikkiso Co., Ltd.
- the particle size distribution may be measured in a state where each particle is mixed. You may obtain
- the total content of abrasive grains in the polishing composition is preferably 2% by mass or more, more preferably 10% by mass or more. As the total content of abrasive grains increases, a higher polishing rate is obtained.
- the total content of abrasive grains in the polishing composition is preferably 50% by mass or less, and more preferably 40% by mass or less. As the total content of the abrasive grains decreases, the dispersion stability of the polishing composition improves and handling becomes easy.
- Water becomes a dispersion medium or solvent for other components. It is preferable that water does not inhibit the function of other components contained in the polishing composition. Examples of such water include water having a total content of transition metal ions of 100 ppb or less.
- the purity of water can be increased, for example, by removing impurity ions using an ion exchange resin, removing foreign matters using a filter, distillation, or the like. Specifically, for example, ion exchange water, pure water, ultrapure water, distilled water or the like is preferably used.
- the polishing composition may contain an oxidizing agent.
- the oxidizing agent serves to chemically polish the surface of the compound semiconductor substrate.
- the oxidizing agent include permanganate, periodic acid, periodate, persulfate, vanadate, hydrogen peroxide, hypochlorite, iron oxide, peracetic acid, ozone, and the like. It is done.
- permanganate and vanadate are preferable from the viewpoint of improving the polishing rate.
- One of these oxidizing agents may be used alone, or two or more may be used in combination.
- the oxidizing agent can be used by mixing with an oxygen donor such as peroxide or oxo acid.
- the content of the oxidizing agent in the polishing composition is preferably 0.2% by mass or more, and more preferably 0.5% by mass or more. As the oxidant content increases, a higher polishing rate is obtained.
- the content of the oxidizing agent in the polishing composition is preferably 10% by mass or less, more preferably 5% by mass or less. As the content of the oxidizing agent is decreased, the stability of the polishing composition is improved.
- the pH range of the polishing composition is preferably 1.0 or more and less than 11.0, more preferably 2.0 or more and less than 8.0. When the pH of the polishing composition is within the above range, the polishing rate is improved.
- the pH of the polishing composition can be adjusted, for example, by adding a pH adjuster.
- a pH adjuster known acids, bases, or salts thereof can be used.
- acids that can be used as a pH adjuster include inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid, boric acid, carbonic acid, hypophosphorous acid, phosphorous acid and phosphoric acid, formic acid, acetic acid, propionic acid, Butyric acid, valeric acid, 2-methylbutyric acid, n-hexanoic acid, 3,3-dimethylbutyric acid, 2-ethylbutyric acid, 4-methylpentanoic acid, n-heptanoic acid, 2-methylhexanoic acid, n-octanoic acid, 2 -Ethylhexanoic acid, benzoic acid, glycolic acid, salicylic acid, glyceric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, maleic acid, phthalic acid, malic acid, tartaric acid, citric acid,
- bases that can be used as a pH adjuster include organic bases such as amines and quaternary ammonium hydroxides, alkali metal hydroxides, alkaline earth metal hydroxides, and ammonia.
- a salt such as an ammonium salt or an alkali metal salt of the above acid can be used in place of the above acid or in combination with the above acid.
- a salt of a weak acid and a strong base, a strong acid and a weak base, or a combination of a weak acid and a weak base is preferable.
- Such salts are expected to exert a pH buffering effect.
- polishing composition other components such as known additives generally contained in the polishing composition can be contained as necessary.
- Other components include, for example, preservatives, antifungal agents, rust inhibitors, additives having an action of further increasing the polishing rate such as complexing agents and etching agents, dispersants that improve the dispersibility of abrasive grains, Examples thereof include a dispersion aid that facilitates redispersion of the aggregate.
- polishing process for polishing a compound semiconductor substrate using the polishing composition will be described.
- a polishing process for polishing a silicon carbide substrate which is a high-hardness compound semiconductor substrate will be described as an example.
- the polishing of the silicon carbide substrate using the polishing composition can be performed using a general polishing apparatus.
- the polishing apparatus include a single-side polishing apparatus and a double-side polishing apparatus.
- a single-side polishing apparatus holds a substrate using a holder called a carrier, and while supplying a polishing composition, presses a surface plate (polishing pad) to which a polishing cloth is applied against one surface of the substrate and rotates the surface plate. Thus, one side of the substrate is polished.
- the double-side polishing apparatus holds the substrate using a carrier and supplies a polishing composition from above while pressing a surface plate (polishing pad) to which a polishing cloth is attached against both sides of the substrate in a direction opposite to each other. By rotating, both sides of the substrate are polished. At this time, the substrate is polished by a physical action caused by friction between the polishing pad and the polishing composition and the substrate and a chemical action that the polishing composition brings to the substrate.
- the polishing conditions in the above polishing step are not particularly limited, but it is preferable to set the polishing pressure and linear velocity for the substrate within a specific range from the viewpoint of improving the polishing rate.
- the polishing pressure is preferably more than 400 g per 1 cm 2 processed area, more preferably 600 g or more per 1 cm 2 processed area.
- the polishing pressure is preferably 1000 g or less per 1 cm 2 of processing area.
- a polishing pressure of 400 g or less per 1 cm 2 of the processing area is usually applied. In the present embodiment, it is preferable to apply a pressure higher than the normal polishing pressure.
- the linear velocity is generally a value that changes due to the influence of the number of revolutions of the polishing pad, the number of revolutions of the carrier, the size of the substrate, the number of substrates, and the like.
- the linear velocity is high, the frictional force applied to the substrate becomes large, so that the mechanical polishing action on the substrate becomes large. Also, the heat generated by friction may enhance the chemical polishing action by the polishing composition.
- the linear velocity is preferably 10 m / min or more, and more preferably 30 m / min or more.
- the linear velocity is preferably 300 m / min or less, more preferably 200 m / min or less. As the linear velocity increases, a higher polishing rate is obtained. When the linear velocity is within the above range, a sufficiently high polishing rate can be achieved, and an appropriate frictional force can be applied to the substrate.
- the supply rate of the polishing composition at the time of polishing depends on the type of substrate to be polished, the type of polishing apparatus, and other polishing conditions, but is sufficient to uniformly supply the entire surface of the substrate and polishing pad. Preferably it is speed.
- the ratio of particles A (small particles) having a particle size of 40 nm or more and 80 nm or less is 50% by mass or more of the whole abrasive grains, and particles B (large particles) having a particle size of 150 nm or more and 300 nm or less ) Is contained so that it has a specific particle size distribution of 10 mass% or more of the whole abrasive grains.
- the silicon carbide substrate can be polished at a high polishing rate under a particularly high polishing pressure. This is an effect that cannot be obtained with a conventional polishing composition used for a silicon carbide substrate or the like. In this respect, the polishing composition is clearly different from the prior art.
- the detailed mechanism for obtaining the above effect is not clear, but is considered to be based on an increase in interaction energy generated between the abrasive grains and the object to be polished.
- mechanical processing of an object to be polished with abrasive grains is caused by frictional force between the abrasive grains and the object to be polished.
- the magnitude of this frictional force depends on the magnitude of interaction energy generated between the abrasive grains and the object to be polished.
- the larger the particle diameter of the abrasive grains the larger the number of molecules in the abrasive grains that come into contact with the object to be polished, and the greater the interaction energy per abrasive grain.
- the abrasive particles that come into contact with the object to be polished by entering the particles A that are small particles into the gap between the particles B that are large particles and the object to be polished. And the number of contact points between the abrasive grains and the object to be polished increases. As the contact point between the abrasive grains and the object to be polished increases, the frictional force between the abrasive grains and the object to be polished increases, and the polishing rate is improved.
- the polishing pad is deformed under stress so as to reduce the gap between the polishing object. Then, the particles A (small particles) trapped in the gap between the polishing pad and the object to be polished before deformation under stress move to the gap between the particles B (large particles) and the object to be polished. As a result, the number of abrasive grains in contact with the object to be polished further increases. A higher frictional force can be generated by increasing the number of abrasive grains in contact with the object to be polished. That is, pressure energy can be converted to a high polishing rate.
- a compound semiconductor substrate such as a silicon carbide substrate can be polished at a high polishing rate.
- the abrasive is at least one selected from silicon oxide, aluminum oxide, zirconium oxide, titanium oxide, manganese oxide, iron oxide, chromium oxide and diamond. In this case, the polishing rate is further improved.
- the polishing composition contains an oxidizing agent. In this case, a higher polishing rate can be obtained.
- the polishing composition contains a pH adjuster, and the polishing composition has a pH of 1.0 or more and less than 11.0. In this case, a higher polishing rate can be obtained.
- the compound semiconductor substrate can be polished at a high polishing rate, the manufacturing time of the compound semiconductor substrate can be shortened. Thereby, the productivity of the compound semiconductor substrate is improved and the manufacturing cost is reduced.
- the polishing composition may be a one-part type or a multi-part type including a two-part type.
- the polishing composition contains an oxidizing agent and a component capable of causing alteration of the oxidizing agent
- the polishing composition is prepared as a multi-dose type, and each component contains the component and the oxidizing agent separately. It is preferable. Thereby, it becomes easy to ensure the storage stability at the time of storage or transportation.
- the polishing composition is a multi-drug type, in the polishing apparatus having a plurality of polishing composition supply paths, each agent constituting the polishing composition is supplied from separate supply paths. You may make it mix within.
- the polishing composition is manufactured and sold in the form of a stock solution, and may be diluted at the time of use. That is, the polishing composition may be prepared by diluting a stock solution of the polishing composition with water.
- the order of mixing and dilution of each agent is arbitrary. For example, a specific agent may be diluted with water and then mixed with the remaining agent. After mixing each agent, the mixture may be diluted with water.
- the polishing pad used in the polishing step using the polishing composition is not particularly limited by the material, physical properties such as hardness and thickness.
- any polishing pad of polyurethane type, non-woven fabric type, suede type, including abrasive grains, or not including abrasive grains may be used.
- abrasive grains various colloidal silicas containing silica particles having a major axis / minor axis ratio of 1.1 or less in various particle size distributions were used.
- the colloidal silica, sodium vanadate as an oxidizing agent and hydrogen peroxide water, and ion-exchanged water were mixed, and ammonia as a pH adjusting agent was added to the mixture to adjust the pH to 6.5.
- polishing compositions of Examples 1 and 2 and Comparative Examples 1 to 8 having different abrasive particle size distributions were prepared.
- Table 1 shows the common composition of each polishing composition.
- Tables 3 and 4 show the particle size distribution of the abrasive grains in each polishing composition.
- the particle size distribution of the abrasive grains was measured by a dynamic light scattering method using UPA-EX250 manufactured by Nikkiso Co., Ltd.
- Test 1 Using the polishing compositions of Examples 1 and 2 and Comparative Examples 1 to 8, the surface of the silicon carbide substrate was polished under the conditions shown in Table 2.
- the silicon carbide substrate used has a Si surface with an off angle of 0 °, a circular shape with a diameter of 50 mm (2 inches), and a Vickers hardness of 2200 Hv.
- polishing rate was evaluated about each polishing composition.
- the polishing rate was calculated by measuring the mass difference between the silicon carbide substrates before and after polishing, and dividing the obtained mass difference by the density, area, and polishing time of the silicon carbide substrate. The results are shown in the “Polishing rate” column of Table 3. Further, each polishing composition was determined based on the calculated polishing rate. The result is shown in the “determination” column of Table 3.
- the criteria for determination are as follows.
- polishing rate is 300 nm / hour or more.
- polishing rate is 200 nm / hour or more and less than 300 nm / hour.
- Test 2 Using the polishing composition of Example 1 and Comparative Example 4, the surface of a sapphire substrate, which is a semiconductor substrate other than the compound semiconductor substrate, was polished under the conditions shown in Table 2.
- the used sapphire substrate is a circular C-plane substrate having a diameter of 50 mm (2 inches).
- the polishing rate was calculated in the same manner as in Test 1 above. The results are shown in the “Polishing rate” column of Table 4.
- the polishing examples of Comparative Examples 1 to 8 were used. An excellent polishing rate was obtained as compared with the case where the silicon carbide substrate was polished using the composition.
- the polishing rate was higher than that of the polishing composition of Comparative Example 4.
- the high polishing rate obtained by the polishing composition of the present invention is an effect particularly exhibited when a compound semiconductor substrate, particularly a silicon carbide substrate is used as a polishing object.
- the compound semiconductor substrate is an object to be polished, this effect is obtained by applying a local pressure to the silicon carbide substrate from the large particles B under a high polishing pressure. This is presumably because the formation of strain is promoted and polishing is enhanced.
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Abstract
Description
砥粒は化合物半導体基板の表面を物理的に研磨する働きをする。砥粒としては、例えば、酸化ケイ素、酸化アルミニウム、酸化ジルコニウム、酸化セリウム、酸化チタン、酸化マンガン、酸化鉄、酸化クロム、ダイヤモンド等からなる粒子が挙げられる。これらの粒子のなかでも、研磨速度の向上の観点から、酸化ケイ素や酸化アルミニウムからなる粒子が好ましく、酸化ケイ素からなる粒子が特に好ましい。酸化ケイ素からなる粒子としては、例えば、コロイダルシリカ、フュームドシリカ、ゾルゲル法シリカから選ばれるシリカ粒子が挙げられる。これらの粒子のなかでも、コロイダルシリカが特に好ましい。これら砥粒のうち一種を単独で用いてもよく、二種以上を組み合わせて用いてもよい。
水は他の成分の分散媒又は溶媒となる。水は、研磨用組成物に含有される他の成分の働きを阻害しないことが好ましい。このような水の例として、例えば遷移金属イオンの合計含有量が100ppb以下の水が挙げられる。水の純度は、例えば、イオン交換樹脂を用いる不純物イオンの除去、フィルターによる異物の除去、蒸留等によって高めることができる。具体的には、例えば、イオン交換水、純水、超純水、蒸留水等を用いることが好ましい。
研磨用組成物は酸化剤を含有してもよい。酸化剤は化合物半導体基板の表面を化学的に研磨する働きをする。酸化剤としては、例えば、過マンガン酸塩、過ヨウ素酸、過ヨウ素酸塩、過硫酸塩、バナジン酸塩、過酸化水素水、次亜塩素酸塩、酸化鉄、過酢酸、オゾン等が挙げられる。これらの酸化剤のなかでも、研磨速度の向上の観点から、過マンガン酸塩やバナジン酸塩が好ましい。これらの酸化剤のうち一種を単独で用いてもよく、二種以上を組み合わせて用いてもよい。更に、酸化剤は、例えば過酸化物やオキソ酸等の酸素供与剤と混合して用いることもできる。
研磨用組成物のpHの範囲は、1.0以上11.0未満であることが好ましく、より好ましくは2.0以上8.0未満である。研磨用組成物のpHが上記の範囲内にある場合、研磨速度が向上する。
研磨用組成物中には、必要に応じて研磨用組成物に一般に含有されている公知の添加剤等のその他成分を含有させることができる。その他成分としては、例えば、防腐剤、防黴剤、防錆剤のほか、錯化剤やエッチング剤等の研磨速度をさらに高める作用を有する添加剤、砥粒の分散性を向上させる分散剤、凝集体の再分散を容易にする分散助剤が挙げられる。
実施例1~2及び比較例1~8の研磨用組成物を用いて、炭化ケイ素基板の表面を表2に示す条件で研磨した。使用した炭化ケイ素基板は、Si面のオフ角0°、直径50mm(2インチ)の円形状、ビッカース硬度2200Hvのものである。そして、各研磨用組成物について研磨速度を評価した。研磨速度は、研磨前後における炭化ケイ素基板の質量差を測定し、得られた質量差を炭化ケイ素基板の密度、面積、及び研磨時間で除することにより算出した。その結果を表3の“研磨速度”欄に示す。また、算出した研磨速度に基づいて、各研磨用組成物の判定を行った。その結果を表3の“判定”欄に示す。なお、判定基準は以下のとおりである。
実施例1及び比較例4の研磨用組成物を用いて、化合物半導体基板以外の半導体基板であるサファイア基板の表面を表2に示す条件で研磨した。使用したサファイア基板は、直径50mm(2インチ)の円形状のC面基板である。そして、各研磨用組成物について、上記試験1と同様にして研磨速度を算出した。その結果を表4の“研磨速度”欄に示す。
Claims (5)
- 化合物半導体基板の研磨に用いられる研磨用組成物であって、
砥粒と水とを含有し、砥粒のうち50質量%以上が粒子径40nm以上80nm以下の粒子Aからなり、且つ砥粒のうち10質量%以上が粒子径150nm以上300nm以下の粒子Bからなることを特徴とする研磨用組成物。 - 前記砥粒は、酸化ケイ素、酸化アルミニウム、酸化ジルコニウム、酸化チタン、酸化マンガン、酸化鉄、酸化クロム及びダイヤモンドから選ばれる少なくとも1種であることを特徴とする請求項1に記載の研磨用組成物。
- 酸化剤を更に含有することを特徴とする請求項1又は2に記載の研磨用組成物。
- pH調整剤を更に含有することを特徴とする請求項1~3のいずれか1項に記載の研磨用組成物。
- 請求項1~4のいずれか1項に記載の研磨用組成物を用いて化合物半導体基板を研磨する研磨工程を含む化合物半導体基板の製造方法。
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US14/381,373 US9796881B2 (en) | 2012-03-05 | 2013-03-04 | Polishing composition and method using said polishing composition to manufacture compound semiconductor substrate |
JP2014503829A JP6042407B2 (ja) | 2012-03-05 | 2013-03-04 | 研磨用組成物、及び当該研磨用組成物を用いた化合物半導体基板の製造方法 |
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TWI546371B (zh) * | 2014-11-10 | 2016-08-21 | 盟智科技股份有限公司 | 研磨組成物 |
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