WO2007138921A1 - 基板エッチング液 - Google Patents
基板エッチング液 Download PDFInfo
- Publication number
- WO2007138921A1 WO2007138921A1 PCT/JP2007/060415 JP2007060415W WO2007138921A1 WO 2007138921 A1 WO2007138921 A1 WO 2007138921A1 JP 2007060415 W JP2007060415 W JP 2007060415W WO 2007138921 A1 WO2007138921 A1 WO 2007138921A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- acid
- etching
- group
- substrate
- etching solution
- Prior art date
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- 238000005530 etching Methods 0.000 title claims abstract description 90
- 239000000758 substrate Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 claims abstract description 46
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims abstract description 41
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 33
- 150000003839 salts Chemical class 0.000 claims abstract description 31
- 239000004065 semiconductor Substances 0.000 claims abstract description 28
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 27
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 27
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 27
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims abstract description 17
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 17
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 claims description 16
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 13
- 239000001530 fumaric acid Substances 0.000 claims description 8
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 8
- 239000011976 maleic acid Substances 0.000 claims description 8
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical compound OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 claims description 7
- HNEGQIOMVPPMNR-IHWYPQMZSA-N citraconic acid Chemical compound OC(=O)C(/C)=C\C(O)=O HNEGQIOMVPPMNR-IHWYPQMZSA-N 0.000 claims description 7
- 229940018557 citraconic acid Drugs 0.000 claims description 7
- HNEGQIOMVPPMNR-NSCUHMNNSA-N mesaconic acid Chemical compound OC(=O)C(/C)=C/C(O)=O HNEGQIOMVPPMNR-NSCUHMNNSA-N 0.000 claims description 7
- HNEGQIOMVPPMNR-UHFFFAOYSA-N methylfumaric acid Natural products OC(=O)C(C)=CC(O)=O HNEGQIOMVPPMNR-UHFFFAOYSA-N 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 239000002210 silicon-based material Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 26
- 239000002184 metal Substances 0.000 abstract description 26
- 239000012535 impurity Substances 0.000 abstract description 16
- 238000011109 contamination Methods 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 49
- -1 for example Chemical group 0.000 description 47
- 239000002253 acid Substances 0.000 description 46
- 235000012431 wafers Nutrition 0.000 description 31
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 12
- 239000002738 chelating agent Substances 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 150000007513 acids Chemical class 0.000 description 10
- 239000012670 alkaline solution Substances 0.000 description 10
- 238000001179 sorption measurement Methods 0.000 description 10
- 239000000654 additive Substances 0.000 description 9
- 150000003863 ammonium salts Chemical class 0.000 description 9
- 239000003945 anionic surfactant Substances 0.000 description 9
- 150000001991 dicarboxylic acids Chemical class 0.000 description 9
- 239000002736 nonionic surfactant Substances 0.000 description 9
- 239000003513 alkali Substances 0.000 description 8
- 229910021645 metal ion Inorganic materials 0.000 description 8
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 8
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 229910052783 alkali metal Inorganic materials 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 229920000768 polyamine Polymers 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 6
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 239000001630 malic acid Substances 0.000 description 6
- 235000011090 malic acid Nutrition 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- 239000004094 surface-active agent Substances 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 5
- 150000005215 alkyl ethers Chemical class 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- 125000001424 substituent group Chemical group 0.000 description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 4
- 125000001559 cyclopropyl group Chemical group [H]C1([H])C([H])([H])C1([H])* 0.000 description 4
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 229920001281 polyalkylene Polymers 0.000 description 4
- 229910052700 potassium Inorganic materials 0.000 description 4
- 239000011591 potassium Substances 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- 125000000542 sulfonic acid group Chemical group 0.000 description 4
- 125000004962 sulfoxyl group Chemical group 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 150000008065 acid anhydrides Chemical class 0.000 description 3
- 150000004996 alkyl benzenes Chemical class 0.000 description 3
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 229910017053 inorganic salt Inorganic materials 0.000 description 3
- 229910000000 metal hydroxide Inorganic materials 0.000 description 3
- 235000011007 phosphoric acid Nutrition 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- WYMDDFRYORANCC-UHFFFAOYSA-N 2-[[3-[bis(carboxymethyl)amino]-2-hydroxypropyl]-(carboxymethyl)amino]acetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)CN(CC(O)=O)CC(O)=O WYMDDFRYORANCC-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- YDONNITUKPKTIG-UHFFFAOYSA-N [Nitrilotris(methylene)]trisphosphonic acid Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CP(O)(O)=O YDONNITUKPKTIG-UHFFFAOYSA-N 0.000 description 2
- 239000006061 abrasive grain Substances 0.000 description 2
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 2
- 229940024606 amino acid Drugs 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 159000000007 calcium salts Chemical class 0.000 description 2
- 238000003486 chemical etching Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229960001484 edetic acid Drugs 0.000 description 2
- DEFVIWRASFVYLL-UHFFFAOYSA-N ethylene glycol bis(2-aminoethyl)tetraacetic acid Chemical compound OC(=O)CN(CC(O)=O)CCOCCOCCN(CC(O)=O)CC(O)=O DEFVIWRASFVYLL-UHFFFAOYSA-N 0.000 description 2
- IFQUWYZCAGRUJN-UHFFFAOYSA-N ethylenediaminediacetic acid Chemical compound OC(=O)CNCCNCC(O)=O IFQUWYZCAGRUJN-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- NBZBKCUXIYYUSX-UHFFFAOYSA-N iminodiacetic acid Chemical compound OC(=O)CNCC(O)=O NBZBKCUXIYYUSX-UHFFFAOYSA-N 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 229910001410 inorganic ion Inorganic materials 0.000 description 2
- 229910003002 lithium salt Inorganic materials 0.000 description 2
- 159000000002 lithium salts Chemical class 0.000 description 2
- 159000000003 magnesium salts Chemical class 0.000 description 2
- 150000004692 metal hydroxides Chemical class 0.000 description 2
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920002503 polyoxyethylene-polyoxypropylene Polymers 0.000 description 2
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 2
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- UQDJGEHQDNVPGU-UHFFFAOYSA-N serine phosphoethanolamine Chemical compound [NH3+]CCOP([O-])(=O)OCC([NH3+])C([O-])=O UQDJGEHQDNVPGU-UHFFFAOYSA-N 0.000 description 2
- 150000003377 silicon compounds Chemical class 0.000 description 2
- 159000000000 sodium salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052714 tellurium Inorganic materials 0.000 description 2
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 2
- SSJXIUAHEKJCMH-PHDIDXHHSA-N (1r,2r)-cyclohexane-1,2-diamine Chemical compound N[C@@H]1CCCC[C@H]1N SSJXIUAHEKJCMH-PHDIDXHHSA-N 0.000 description 1
- PSBDWGZCVUAZQS-UHFFFAOYSA-N (dimethylsulfonio)acetate Chemical class C[S+](C)CC([O-])=O PSBDWGZCVUAZQS-UHFFFAOYSA-N 0.000 description 1
- CGBYBGVMDAPUIH-ONEGZZNKSA-N (e)-2,3-dimethylbut-2-enedioic acid Chemical compound OC(=O)C(/C)=C(\C)C(O)=O CGBYBGVMDAPUIH-ONEGZZNKSA-N 0.000 description 1
- SASYHUDIOGGZCN-ONEGZZNKSA-N (e)-2-ethylbut-2-enedioic acid Chemical compound CC\C(C(O)=O)=C/C(O)=O SASYHUDIOGGZCN-ONEGZZNKSA-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
- MXYOPVWZZKEAGX-UHFFFAOYSA-N 1-phosphonoethylphosphonic acid Chemical compound OP(=O)(O)C(C)P(O)(O)=O MXYOPVWZZKEAGX-UHFFFAOYSA-N 0.000 description 1
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- URDCARMUOSMFFI-UHFFFAOYSA-N 2-[2-[bis(carboxymethyl)amino]ethyl-(2-hydroxyethyl)amino]acetic acid Chemical compound OCCN(CC(O)=O)CCN(CC(O)=O)CC(O)=O URDCARMUOSMFFI-UHFFFAOYSA-N 0.000 description 1
- RAEOEMDZDMCHJA-UHFFFAOYSA-N 2-[2-[bis(carboxymethyl)amino]ethyl-[2-[2-[bis(carboxymethyl)amino]ethyl-(carboxymethyl)amino]ethyl]amino]acetic acid Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CCN(CC(O)=O)CC(O)=O)CC(O)=O RAEOEMDZDMCHJA-UHFFFAOYSA-N 0.000 description 1
- GRUVVLWKPGIYEG-UHFFFAOYSA-N 2-[2-[carboxymethyl-[(2-hydroxyphenyl)methyl]amino]ethyl-[(2-hydroxyphenyl)methyl]amino]acetic acid Chemical compound C=1C=CC=C(O)C=1CN(CC(=O)O)CCN(CC(O)=O)CC1=CC=CC=C1O GRUVVLWKPGIYEG-UHFFFAOYSA-N 0.000 description 1
- YGDVXSDNEFDTGV-UHFFFAOYSA-N 2-[6-[bis(carboxymethyl)amino]hexyl-(carboxymethyl)amino]acetic acid Chemical compound OC(=O)CN(CC(O)=O)CCCCCCN(CC(O)=O)CC(O)=O YGDVXSDNEFDTGV-UHFFFAOYSA-N 0.000 description 1
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- KSAIICDEQGEQBK-UHFFFAOYSA-N 3-hydroxy-2,2-dimethylbutanedioic acid Chemical compound OC(=O)C(C)(C)C(O)C(O)=O KSAIICDEQGEQBK-UHFFFAOYSA-N 0.000 description 1
- AYKYXWQEBUNJCN-UHFFFAOYSA-N 3-methylfuran-2,5-dione Chemical compound CC1=CC(=O)OC1=O AYKYXWQEBUNJCN-UHFFFAOYSA-N 0.000 description 1
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- BDDLHHRCDSJVKV-UHFFFAOYSA-N 7028-40-2 Chemical compound CC(O)=O.CC(O)=O.CC(O)=O.CC(O)=O BDDLHHRCDSJVKV-UHFFFAOYSA-N 0.000 description 1
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- HMNDRWDQGZZYIC-UHFFFAOYSA-N [2-(phosphonomethylamino)ethylamino]methylphosphonic acid Chemical compound OP(O)(=O)CNCCNCP(O)(O)=O HMNDRWDQGZZYIC-UHFFFAOYSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- MKBUQYWFFBCMFG-UHFFFAOYSA-N acetic acid propane-1,1-diamine Chemical compound CC(O)=O.CC(O)=O.CC(O)=O.CC(O)=O.CCC(N)N MKBUQYWFFBCMFG-UHFFFAOYSA-N 0.000 description 1
- CGBYBGVMDAPUIH-UHFFFAOYSA-N acide dimethylmaleique Natural products OC(=O)C(C)=C(C)C(O)=O CGBYBGVMDAPUIH-UHFFFAOYSA-N 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 150000003973 alkyl amines Chemical class 0.000 description 1
- 150000008051 alkyl sulfates Chemical class 0.000 description 1
- 125000005211 alkyl trimethyl ammonium group Chemical group 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 239000002280 amphoteric surfactant Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229960005261 aspartic acid Drugs 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 229940092714 benzenesulfonic acid Drugs 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
- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical class [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- XFTRTWQBIOMVPK-UHFFFAOYSA-N citramalic acid Chemical compound OC(=O)C(O)(C)CC(O)=O XFTRTWQBIOMVPK-UHFFFAOYSA-N 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000002242 deionisation method Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- CGBYBGVMDAPUIH-ARJAWSKDSA-N dimethylmaleic acid Chemical compound OC(=O)C(/C)=C(/C)C(O)=O CGBYBGVMDAPUIH-ARJAWSKDSA-N 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- NFDRPXJGHKJRLJ-UHFFFAOYSA-N edtmp Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CCN(CP(O)(O)=O)CP(O)(O)=O NFDRPXJGHKJRLJ-UHFFFAOYSA-N 0.000 description 1
- ZZGUZQXLSHSYMH-UHFFFAOYSA-N ethane-1,2-diamine;propanoic acid Chemical compound NCCN.CCC(O)=O.CCC(O)=O ZZGUZQXLSHSYMH-UHFFFAOYSA-N 0.000 description 1
- BEFDCLMNVWHSGT-UHFFFAOYSA-N ethenylcyclopentane Chemical compound C=CC1CCCC1 BEFDCLMNVWHSGT-UHFFFAOYSA-N 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- XLYMOEINVGRTEX-UHFFFAOYSA-N fumaric acid monoethyl ester Natural products CCOC(=O)C=CC(O)=O XLYMOEINVGRTEX-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- QAMFBRUWYYMMGJ-UHFFFAOYSA-N hexafluoroacetylacetone Chemical compound FC(F)(F)C(=O)CC(=O)C(F)(F)F QAMFBRUWYYMMGJ-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- ZMZDMBWJUHKJPS-UHFFFAOYSA-N hydrogen thiocyanate Natural products SC#N ZMZDMBWJUHKJPS-UHFFFAOYSA-N 0.000 description 1
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 description 1
- 150000002462 imidazolines Chemical class 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- DJQJFMSHHYAZJD-UHFFFAOYSA-N lidofenin Chemical compound CC1=CC=CC(C)=C1NC(=O)CN(CC(O)=O)CC(O)=O DJQJFMSHHYAZJD-UHFFFAOYSA-N 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000002762 monocarboxylic acid derivatives Chemical class 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 150000002815 nickel Chemical class 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229940083254 peripheral vasodilators imidazoline derivative Drugs 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000005368 silicate glass Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000004334 sorbic acid Substances 0.000 description 1
- 229940075582 sorbic acid Drugs 0.000 description 1
- 235000010199 sorbic acid Nutrition 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- CBXCPBUEXACCNR-UHFFFAOYSA-N tetraethylammonium Chemical class CC[N+](CC)(CC)CC CBXCPBUEXACCNR-UHFFFAOYSA-N 0.000 description 1
- QEMXHQIAXOOASZ-UHFFFAOYSA-N tetramethylammonium Chemical class C[N+](C)(C)C QEMXHQIAXOOASZ-UHFFFAOYSA-N 0.000 description 1
- AGGKEGLBGGJEBZ-UHFFFAOYSA-N tetramethylenedisulfotetramine Chemical compound C1N(S2(=O)=O)CN3S(=O)(=O)N1CN2C3 AGGKEGLBGGJEBZ-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- ILJSQTXMGCGYMG-UHFFFAOYSA-N triacetic acid Chemical compound CC(=O)CC(=O)CC(O)=O ILJSQTXMGCGYMG-UHFFFAOYSA-N 0.000 description 1
- UNXRWKVEANCORM-UHFFFAOYSA-N triphosphoric acid Chemical compound OP(O)(=O)OP(O)(=O)OP(O)(O)=O UNXRWKVEANCORM-UHFFFAOYSA-N 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
Classifications
-
- 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
- H01L21/30604—Chemical etching
-
- 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
- C09K13/00—Etching, surface-brightening or pickling compositions
- C09K13/02—Etching, surface-brightening or pickling compositions containing an alkali metal hydroxide
-
- 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
- H01L21/02019—Chemical etching
-
- 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
Definitions
- the present invention relates to an etching solution and an etching method for a substrate, particularly a semiconductor substrate.
- a semiconductor wafer is generally manufactured by the following steps.
- Slicing step A step of slicing a single crystal ingot produced by FZ method, CZ method or the like to obtain a thin disk-like woofer (azu cut 'woofer).
- Beveling process A process of chamfering the outer periphery of the AZCAT® wafer.
- Etching process The processing strain layer remaining on the wrapped wafer is removed by a chemical method (chemical etching), and at the same time, the abrasive, metal impurities, particles, etc. adhering to the wafer surface are removed and cleaned. The process of obtaining naughty eighteen (etched woofer).
- Heat treatment step A step of stabilizing resistance by eliminating the oxidized donor doped in the crystal by low-temperature heat treatment.
- Polishing process A process of polishing the surface of etched wafer 8 with extremely fine abrasive grains to obtain a mirrored wafer having a highly flat mirror surface.
- Cleaning step A step of cleaning the polished wafer and removing abrasives, metal impurities, particles, etc. adhering to the surface of the wafer to obtain a cleaner wafer.
- acid etching has a problem of deteriorating the flatness of the wafer, which is difficult to uniformly etch the wafer due to a high etching rate, and a problem that harmful by-products such as N0x are generated. Recently, uniform etching is possible. Alkaline etching, which does not deteriorate the flatness of woofers and has few problems of generating harmful byproducts, is often used.
- alkali etching of semiconductor wafers commercially available alkaline solutions for industrial or electronic industries (for example, sodium hydroxide solution, potassium hydroxide solution, etc.) are used. Contains a high concentration of metal impurities (eg, nickel, chromium, iron, copper, etc.) of several ppm to several tens of ppm, and even an alkaline solution for the electronics industry is in the order of tens of ppb to several ppm. Contains metal impurities.
- metal impurities eg, nickel, chromium, iron, copper, etc.
- Patent Document 1 a method of dissolving metal silicon and / or silicon compound in an alkaline solution in advance, and deionizing metal ions in the alkaline solution by dissolving hydrogen gas
- Patent Document 1 a method of removing metal ions in an alkaline solution using an ion exchange resin (Patent Document 1), and having a base oxidation potential compared to the reversible potential of the metal ion such as nitrite.
- Patent Document 2 A method of deionizing metal ions in an alkali solution by dissolving a reducing agent in the alkali solution (Patent Document 2) has been proposed, but the metal present in the alkali solution is also proposed by these methods. Deionization and removal of metal ions derived from impurities was insufficient.
- Patent Document 3 a method has been proposed in which metal ions in an alkaline solution are reduced by immersing stainless steel in the alkaline solution for 10 hours or more.
- Patent Document 1 Japanese Patent Laid-Open No. 9-129624
- Patent Document 2 Japanese Patent Laid-Open No. 10-310883
- Patent Document 3 Japanese Patent Laid-Open No. 2001-250807 Disclosure of the invention
- the present invention provides an etching solution and an etching method for a substrate, particularly a semiconductor substrate, which can reduce contamination by metal ions, which is effective in solving the above-described problems.
- the present invention has been made for the purpose of solving the above-described problems, and has the following configuration.
- An etching solution for a substrate comprising a dicarboxylic acid represented by the following general formula (1) or a salt thereof and 20% (W / W) or more of an alkali metal hydroxide.
- ⁇ 1 and ⁇ 2 each independently represent a hydrogen atom, a hydroxyl group, a carboxyl group, an alkyl group having 1 to 3 carbon atoms, or ⁇ 1 and ⁇ 2 form a bond
- ⁇ ⁇ R 4 each independently represents a hydrogen atom, a hydroxyl group, a carboxyl group or an alkyl group having 1 to 3 carbon atoms, provided that when T 1 and T 2 do not form a bond, Any two of I 4 , T 2 and ⁇ to R 4 are carboxyl groups, and any one of the remaining is a hydroxyl group, and the others are independently hydrogen atoms or carbon atoms of 1 to 3 If it is an alkyl group and T 1 and T 2 form a bond, any one of ⁇ to R 4 is a carboxyl group, and the rest are each independently a hydrogen atom or carbon number 1 ⁇ 3 alkyl groups.
- the present inventors have found that the specific dicarboxylic acid represented by the general formula (1) or a salt thereof and an alkali of 20% (W / W) or more. If a substrate, particularly a semiconductor substrate, is etched using a solution containing a metal hydroxide, contamination of the semiconductor substrate, which is an etching target, due to metal impurities can be reduced, and the desired etching can be achieved effectively. Furthermore, the present inventors have found that the solution can be easily prepared in a short time, and have completed the present invention. The invention's effect
- the contamination of the semiconductor substrate by the metal impurity (adsorption of the metal impurity to the surface of the semiconductor substrate) can be effectively suppressed. .
- the etching solution according to the present invention includes at least a dicarboxylic acid represented by the following general formula (1) or a salt thereof (hereinafter abbreviated as a dicarboxylic acid or a salt thereof according to the present invention) and an alkaline metal hydroxide It includes things.
- ⁇ 1 and ⁇ 2 each independently represent a hydrogen atom, a hydroxyl group, a carboxyl group, an alkyl group having 1 to 3 carbon atoms, or ⁇ 1 and ⁇ 2 form a bond
- ⁇ ⁇ R 4 each independently represents a hydrogen atom, a hydroxyl group, a carboxyl group or an alkyl group having 1 to 3 carbon atoms, provided that when T 1 and T 2 do not form a bond, Any one of T 1 T 2 and ⁇ to R 4 is a carboxyl group and the remaining one is a hydroxyl group, and the others are independently a hydrogen atom or an alkyl having 1 to 3 carbon atoms.
- any two of Ri to R 4 are carboxyl groups, and the rest are each independently a hydrogen atom or a carbon number of 1 to 3 is an alkyl group.
- the alkyl group having 1 to 3 carbon atoms represented by T 1 and T 2 may be linear, branched or cyclic, for example, a methyl group, an ethyl group, n- A propyl group, an isopropyl group, and a cyclopropyl group are mentioned. Of these, a methyl group is preferable.
- the alkyl group having 1 to 3 carbon atoms represented by ⁇ to R 4 may be linear, branched or cyclic, for example, a methyl group, an ethyl group, an n-propyl group , An isopropyl group, and a cyclopropyl group. Of these, a methyl group is preferable.
- T 1 and T 2 form a bond, because a double bond is formed between two carbon atoms (C) in general formula (1). That means that.
- the dicarboxylic acid according to the present invention is doubled between the two carbon atoms (C) of the general formula (1). There are two cases: when a bond is formed and when a single bond is formed. c RR —————
- Examples of the above include dicarboxylic acids represented by the following general formula (2).
- R to R 4 ′ each independently represents a hydrogen atom, a carboxyl group or an alkyl group having 1 to 3 carbon atoms, provided that any two of I ⁇ to R ′ are carboxyl groups;
- the rest are each independently a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.
- the alkyl group having 1 to 3 carbon atoms represented by R 1 to R 4 ′ may be linear, branched or cyclic, for example, methyl group, ethyl group, n ⁇ Examples thereof include a propyl group, an isopropyl group, and a cyclopropyl group. Of these, a methyl group is preferable.
- any one of R 1 ′ and R 2 is a carboxyl group
- one of R 3 ′ and R 4 ′ is a force S carboxyl group
- the rest are each independently a hydrogen atom or carbon number Those having 1 to 3 alkyl groups are preferred.
- At least one substituent is a hydrogen atom, and the other substituent is a hydrogen atom.
- an alkyl group having 1 to 3 carbon atoms is preferred.
- the remaining two substituents are all hydrogen atoms.
- dicarboxylic acid according to the present invention represented by the general formula (2) as described above include fumaric acid, maleic acid, dimethyl fumaric acid, dimethyl maleic acid, citraconic acid, mesaconic acid, ethyl fumaric acid, and ethyl malein.
- An acid etc. are mentioned. Of these, fumaric acid, maleic acid, citraconic acid and mesaconic acid are preferred, and fumaric acid and maleic acid are particularly preferred.
- examples in which a single bond is formed between two carbon atoms (C) include dicarboxylic acids represented by the following general formula (3).
- T 1 ′′, T 2 ′′ and R 1 ′ to R 4 ′′ each independently represent a hydrogen atom, a hydroxyl group, a carboxyl group, or an alkyl group having 1 to 3 carbon atoms.
- T 1 ′′, T Any two of “ 2 ” and R to R 4 ” are carboxyl groups, and the remaining one is a hydroxyl group, and the others are independently a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.
- the alkyl group having 1 to 3 carbon atoms represented by D 1 ", T 2 " and R 1 'to R 4 " may be linear, branched or cyclic. Examples thereof include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, and a cyclopropyl group, and a methyl group is preferable.
- any one of T 1 ′, R 1 ′′ and R 2 is a carboxyl group, and any one of T 2 , R 3 ′′ and R, is a carboxyl group, and any one of the remaining ones Is a hydroxyl group, and those other than these are preferably independently a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.
- T 1 ", T 2" and nor hydroxyl group at Karubokishinore group of ' ⁇ length 4' The remaining three substituents, the remaining three substituents are all hydrogen atoms Is preferred.
- dicarboxylic acid according to the present invention represented by the general formula (3) as described above include malic acid, 2,3,3-trimethylmalic acid, 2,3-dimethylmalic acid, 3,3- Examples include dimethylmalic acid, 2-methylmalic acid, and 3-methylmalic acid. Of these, malic acid and the like are preferable. As malic acid, D-form, L-form, DL-form, and mixtures of D-form and L-form with different mixing ratios are acceptable.
- Examples of the salt of the dicarboxylic acid according to the present invention as described above include, for example, alkali metal salts (such as sodium salt, potassium salt, lithium salt, and cesium salt), alkaline earth metal salts (such as calcium salt and magnesium salt). And ammonium salts such as tetramethylammonium salt, tetraethylammonium salt, tetraptylammonium salt, etc. Alkali metal salts are preferred. Transition metal salts (iron, copper, cobalt, nickel Salt etc.) is not preferred.
- dicarboxylic acids or salts thereof those selected from fumaric acid, maleic acid, citraconic acid, mesaconic acid, malic acid and salts thereof are particularly preferred.
- dicarboxylic acids or salts thereof according to the present invention as described above may be used alone or in appropriate combination of two or more.
- the amount of the dicarboxylic acid or salt thereof according to the present invention varies depending on the type of the dicarboxylic acid or salt thereof according to the present invention to be used, the amount of alkali metal hydroxide to be used together, and the like. Although it cannot be said, for example, the lower limit is usually 50 ppm or more, preferably 10 ppm or more, more preferably 10 00 ppm or more, and the upper limit is usually less than the saturation amount, preferably 1000 Oppm or less, more preferably 5000 ppm or less.
- alkali metal hydroxide used in the present invention examples include sodium hydroxide and potassium hydroxide.
- alkali metal hydroxides may be used alone or in appropriate combination of two or more.
- the amount of alkali metal hydroxide used varies depending on the type of alkali metal hydroxide and the like, and thus cannot be generally stated.
- the lower limit is usually 20% (W / W) or more, preferably 40% (W / W W) or more, more preferably 45% (W / W) or more
- the upper limit is usually 60% (W / W) or less, preferably 55% (W / W) or less, more preferably 52% (W / W).
- the etching solution of the present invention comprises the dicarboxylic acid or a salt thereof according to the present invention as described above and an alkali metal hydroxide having a high concentration of 20% (W / W) or more.
- the etching solution of the present invention is usually in the form of an aqueous solution, and the dicarboxylic acid or a salt thereof according to the present invention and a high concentration alkali metal hydroxide are mixed with water so as to be in the concentration range as described above. It is prepared by dissolving.
- any method can be used as long as these components can be finally mixed and dissolved in water.
- a method of adding dissolved dicarboxylic acid or salt thereof or Z and alkali metal hydroxide according to the present invention, or dicarboxylic acid or salt thereof and Examples thereof include a method in which a potassium metal hydroxide is directly added to water, dissolved and stirred. That is, each component may be sequentially added and mixed in water in an appropriate order, or all components may be added and then dissolved in water.
- the thus prepared etching solution according to the present invention is preferably subjected to a filtration treatment or the like before use.
- the water used here may be water purified by distillation, ion exchange treatment, or the like, but so-called ultrapure water used in this field is more preferable.
- the dicarboxylic acid or the salt itself according to the present invention as described above may be used, or the two carboxyl groups of the dicarboxylic acid according to the present invention (A An acid anhydride obtained by dehydration condensation of (-COOH) (eg, maleic anhydride, citraconic anhydride, etc.) may be used. That is, when the etching solution of the present invention is prepared using an acid anhydride, the acid anhydride easily reacts with water in the solution (etching solution) to form a dicarboxylic acid. In the (etching solution), the dicarboxylic acid according to the present invention is present. Similarly, it goes without saying that the ester of the dicarboxylic acid according to the present invention may be used.
- An acid anhydride obtained by dehydration condensation of (-COOH) eg, maleic anhydride, citraconic anhydride, etc.
- the etching solution of the present invention is strongly alkaline and usually has a pH of 13 or more.
- additives usually used in this field include chelating agents (aminopolycarboxylic acid-based chelating agents or inorganic salts thereof), surfactants, oxidizing agents (hydrogen peroxide, ozone, oxygen, etc.), silicon, dissolved gases [argon , Nitrogen, etc.].
- chelating agents aminopolycarboxylic acid-based chelating agents or inorganic salts thereof
- surfactants oxidizing agents (hydrogen peroxide, ozone, oxygen, etc.), silicon, dissolved gases [argon , Nitrogen, etc.].
- the etching solution according to the present invention includes one containing one kind of additive selected from a chelating agent, a surfactant, an oxidant, silicon, and a dissolved gas.
- a reducing substance for example, a reducing agent, hydrogen, etc.
- the chelating agent used in the present invention is not particularly limited as long as it is usually used in this field.
- aminopolycarboxylic acid chelating agents, phosphonic acid chelating agents, N-substituted amino acids, amides examples thereof include condensed phosphoric acids, alkanol ketones, and inorganic ions.
- aminopolycarboxylic acid chelating agents are particularly preferred.
- the aminopolycarboxylic acid-based chelating agent as described above include alkyliminopolycarboxylic acids (hydroxyethyliminodiacetic acid (HIDA), iminodiacetic acid (IDA), etc.), which may have a hydroxy group, Tri-neck polycarboxylic acid [Nitri-neck tri-acetic acid (NTA), Ni-tri-n-tripropionic acid (NTP), etc.], Monoalkylene polyamine polycarboxylic acid [Ethylene diamine tetraacetic acid (EDTA), Ethylene diamine diacetic acid (EDDA), Ethylene diamine Dipropionic acid dihydrochloride (EDDP), hydroxyethyl ethylenediamine triacetic acid (EDTA-OH), 1,6-hexamethylenediamine-, -tetraacetic acid (HDTA), N, N_bis (2-hydroxy Benzyl
- polyaminoalkane polycarboxylic acid [diaminopropanetetraacetic acid (Methy ⁇ EDTA), trans-1,2-diaminocyclohexane-, _tetraacetic acid (0 below 8), etc.], polyamino 1 to 4 in a molecule such as alkanol polycarboxylic acid (such as diaminopropanol tetraacetic acid (DPTA-OH)), hydroxyalkynole ether polyamine polycarboxylic acid (such as glycol ether diamine tetraacetic acid (GEDTA)) And nitrogen-containing polyrubonic acids having 2 to 6 carboxyl groups.
- alkanol polycarboxylic acid such as diaminopropanol tetraacetic acid (DPTA-OH)
- hydroxyalkynole ether polyamine polycarboxylic acid such as glycol ether diamine tetraacetic acid (GEDTA)
- inorganic salts examples include alkali metal salts (sodium salt, potassium salt, lithium salt, cesium salt, etc.), alkaline earth metal salts (calcium salt, magnesium salt), and the like. preferable.
- monoalkylene polyamine carboxylic acid, polyalkylene polyamine carboxylic acid or polyalkylene polyamine carboxylic acid or an inorganic salt thereof is particularly preferable.
- EDTA, DTPA or an inorganic salt thereof is preferred.
- DTPA or an inorganic salt thereof is particularly preferred.
- aminopolycarboxylic acid chelating agents or their inorganic salts may be used alone or in appropriate combination of two or more.
- Examples of phosphonic acid-based chelating agents include aminopoly (alkylphosphonic acid) [aminotris (methylenephosphonic acid), etc.], bitripoly (alkylphosphonic acid) [nitrilotris (methylenephosphonic acid) (NTPO), etc.], mono Or polyalkylene polyamine poly (alkylphosphonic acid) [ethylenediaminetetrakis (methylenephosphonic acid) (EDTPO), ethylenediamine - ⁇ , ⁇ '- Bis (methylenephosphonic acid) (EDDPO), isopropylenediaminetetrakis (methylenephosphonic acid), diethylenetriamine- ⁇ , ⁇ , ⁇ ', ⁇ ", ⁇ '-penta (methylenephosphonic acid), ethylenediaminebis (methylenephosphonic acid) ), Hexenediaminetetrakis (methylenephosphonic acid), etc.], alkylaminopoly (alkylphosphonic acid) [ethylaminobis (methylenephosphonic
- N-substituted amino acids examples include dihydroxyethyl daricine (DHEG) and N-acetylenoglycine.
- amides examples include benzenoreamide.
- Examples of the condensed phosphoric acid include tripolyphosphoric acid and hexamethalic acid.
- alkanoyl ketones examples include acetylacetone and hexafluoroacetylacetone.
- inorganic ions examples include halide ions (F—, CI, Br ′′, ⁇ ), cyanide ions such as thiocyanate ions, thiosulfate ions, ammonium ions, etc.
- the lower limit is usually 50 ⁇ pm or more, preferably lOO ppm or more, more preferably lOOO ppm or more. Is usually below saturation, preferably below lOOOOppm, more preferably below 5000ppm.
- Examples of the origin (materials used) of silicon include metal silicon (polycrystalline or single crystal silicon) and silicon compounds (for example, silica, silicate glass, etc.). 2g / L or more.
- Examples of the surfactant include nonionic surfactants having a polyoxyalkylene group in the molecule, for example, sulfonic acid group, carboxyl group, phosphonic acid group, sulfoxyl group and phosphonoxyl group strength in the molecule.
- Anionic surfactants having a selected group such as alkylamines such as alkyltrimethylammonium, alkyldimethyl Quaternary ammonium such as tilbenzyl ammonium, for example, alkyl pyridinium, cationic surfactants such as salts thereof (for example, hydrochloride, sulfate, etc.), such as alkyl betaine derivatives, imidazolinium, etc.
- amphoteric surfactants such as betaine derivatives, sulfobetaine derivatives, aminocarboxylic acid derivatives, imidazoline derivatives, and amine amine derivatives, but are not limited thereto.
- nonionic surfactant having a polyoxyalkylene group in the molecule include polyoxyalkylene alkyl ethers, polyoxyalkylene polyalkylaryl ethers, etc.
- Nonionic surfactants having a polyoxyethylene group in the molecule for example, nonionic surfactants having a polyoxypropylene group in the molecule such as tellurium, such as polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene polyol Examples thereof include nonionic surfactants having a polyoxyethylene group and a polyoxypropylene group in the molecule such as xypropylene alkylphenyl ether.
- anionic surfactant having a group selected from a sulfonic acid group, a carboxyl group, a phosphonic acid group, a sulfoxyl group, and a phosphonoxyl group in the molecule include alkylsulfonic acid, alkylbenzenesulfonic acid, alkylnaphthalenesulfonic acid, Anionic surfactants having a sulfonic acid group in the molecule, such as alkali metal salts such as sodium and potassium, such as ammonium salts, and particularly preferred are ammonium salts, such as alkylcarboxylic acids and alkylbenzenecarboxylic acids.
- Anionic surfactants having a carboxyl group in the molecule such as acids, alkylnaphthalene carboxylic acids, and salts thereof (for example, alkali metal salts such as sodium and potassium, such as ammonium salts, among which ammonium salts are preferred).
- 'Sai Qi ij In molecules such as norequinolephosphonic acid, anolequinolebenzenephosphonic acid, anolequinaphthalenephosphonic acid, and salts thereof (for example, alkali metal salts such as sodium and potassium, such as ammonium salts, among which ammonium salts are preferred)
- Anionic surfactants having a phosphonic acid group such as alkyl sulfate ester, alkyl benzene sulfate ester, polyoxyethylene alkyl sulfate ester, polyoxyethylene alkyl benzene sulfate ester, polyoxyethylene alkyl naphthalene sulfate ester
- anionic surfactants having a sulfoxyl group in the molecule such as tellurium and salts thereof (for example, alkali metal salts such as sodium and potassium, such as ammonium salts, among which ammonium salts are preferred).
- nonionic surfactants and anionic surfactants are preferred.
- nonionic surfactants polyoxyalkylene alkyl ethers are particularly preferred.
- anionic surfactants those having a sulfonic acid group in the molecule and those having a sulfoxyl group in the molecule are particularly preferred. Les. More specifically, nonionic surfactants having a polyoxyethylene group in the molecule such as polyoxyethylene alkyl ether, and polyoxyethylene groups and polyoxypropylene groups in the molecule such as polyoxyethylene polyoxypropylene alkyl ether.
- nonionic surfactants having a carboxyl group in the molecule such as alkyl benzene sulfonic acid, and anionic surfactants having a sulfoxinole group in the molecule such as polyoxyethylene alkyl sulfate are particularly suitable.
- These surfactants may be used alone or in combination of two or more.
- the amount of the surfactant used varies depending on the type of the surfactant and cannot be generally stated. For example, it is usually 0.0001 to:!% By weight, preferably 0.0001 to 0.1% by weight, more preferably 0 ⁇ 0001 to 0 ⁇ 0
- the etching method of the present invention comprises contacting the substrate with the etching solution of the present invention as described above and treating the substrate with the etching solution of the present invention.
- the etching method of the present invention is known per se except that the substrate is etched using the etching solution according to the present invention containing the dicarboxylic acid or salt thereof according to the present invention and an alkali metal hydroxide as described above. This may be performed in accordance with an etching method such as a dip method or a spray etch method.
- the substrate when performing etching as described above, the substrate may be swung as necessary.
- the etching method is not particularly limited, and for example, a batch method, a single wafer method, or the like can be used.
- the lower limit is usually room temperature or higher, preferably 60 degrees or higher, more preferably 65 degrees or higher, and the upper limit is usually 100 ° C or lower, preferably 90 ° C or lower. More preferably, it is 85 ° C or lower.
- the temperature of the etching solution of the present invention is set to the temperature range as described above, and this is brought into contact with the substrate.
- the substrate to which the etching solution and the etching method of the present invention are applied is not particularly limited as long as it is usually used in this field, and also depends on the purpose of use of the etching solution (etching method).
- Semiconductor substrates made of silicon-based materials such as silicon, amorphous silicon, polysilicon, silicon oxide film, silicon nitride film, compound semiconductors such as gallium-arsenic, gallium-phosphorus, indium-phosphorus, etc., for example, glass substrates such as LCD Etc.
- the processing agent and the processing method of this invention are used suitably for a semiconductor substrate, especially a semiconductor substrate made of a silicon-based material.
- a predetermined amount of the predetermined additives shown in Table 1 was added to a 48% NaOH (manufactured by Shinyo Chemical Co., Ltd.) solution containing trace amounts of Fe, Ni and Cu as impurities.
- etching solutions obtained in the above (1) was heated to 85 ° C, and then 6 inch wafers were immersed in these for 5 minutes for etching (85 ° C). The wafer was taken out, washed with running water, washed with pure water, and spin-dried.
- the amount of metal on the etched wafer surface obtained in (2) above was measured with a total reflection fluorescent X-ray apparatus (“TREX610” manufactured by Technos).
- the dicarboxylic acid according to the present invention that is, a dicarboxylic acid having a specific structure represented by the general formula (1) (fumaric acid, maleic acid, citraconic acid, mesaconic acid and DL- Malic acid) has a high effect of suppressing the adsorption of metal to the semiconductor substrate surface (No. 2 to 6), whereas it is contained in monocarboxylic acid (sorbic acid, crotonic acid) and general formula (1) of the present invention.
- dicarboxylic acids L-aspartic acid, succinic acid, L (+)-tartaric acid and itaconic acid
- have a low adsorption inhibiting effect No. 7 to 13).
- DL-malic acid has a good effect of suppressing the adsorption to metals when the concentration in the etching solution is 50 ppm or more, and it is particularly high when the concentration is more than lOOOppm. .
- DL-malic acid was added in an amount of 1000 ⁇ m to a NaOH solution (manufactured by Shinyo Chemical Co., Ltd.) having a predetermined concentration shown in Table 3 (containing trace amounts of Fe, Ni and Cu as impurities).
- the etching solution obtained in the above (1) was heated to various temperatures of 85 ° C., and then a wafer piece (2 cm ⁇ 2 cm) was immersed therein for 5 minutes for etching (85 ° C.).
- the roughness of the wafer piece surface obtained in (2) above was measured with an atomic force microscope (“Na n0P i CS 2 100” manufactured by SII).
- the surface of the semiconductor substrate is rough at low concentrations, and the amount used is preferably 20% (W / W) or more as the concentration in the etching solution. I understand.
- malic acid has the effect of suppressing the adsorption of metal to the surface of a semiconductor substrate in either DL or optical isomers (L or D).
- L or D optical isomers
- DL and D bodies are highly effective in suppressing adsorption (No. 2 and 4).
- EDTA ethylenediamine tetraacetic acid '0?
- aminopolycarboxylic acids such as EDTA and DTPA have an effect of suppressing the adsorption of metal to the surface of a semiconductor substrate (Nos. 7 to 8), but the dicarbohydrate according to the present invention.
- Acids that is, dicarboxylic acids (fumaric acid, maleic acid, citraconic acid, mesaconic acid and DL-malic acid) having a specific structure represented by the general formula (1) are more expensive than aminopolycarboxylic acids. It can be seen that the effect of suppressing adsorption to the semiconductor substrate surface is high (No. 2 to 6).
- a predetermined amount of the predetermined additives shown in Table 6 was added to a 48% KOH (manufactured by Wako Pure Chemical Industries, Ltd.) solution containing trace amounts of Fe, Ni and Cu as impurities.
- the dicarboxylic acid according to the present invention that is, the dicarboxylic acid having the specific structure represented by the general formula (1) (Fumaric acid, maleic acid, citraconic acid, mesaconic acid and DL-malic acid) exhibit a high metal adsorption inhibitory effect (No. 2-6).
- a substrate particularly a semiconductor substrate
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- ing And Chemical Polishing (AREA)
- Cleaning Or Drying Semiconductors (AREA)
- Weting (AREA)
Abstract
Description
Claims
Priority Applications (2)
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JP2008517857A JPWO2007138921A1 (ja) | 2006-05-26 | 2007-05-22 | 基板エッチング液 |
US12/301,549 US20090227115A1 (en) | 2006-05-26 | 2007-05-22 | Etching solution for substrate |
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JP2006146423 | 2006-05-26 | ||
JP2006-146423 | 2006-05-26 |
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PCT/JP2007/060415 WO2007138921A1 (ja) | 2006-05-26 | 2007-05-22 | 基板エッチング液 |
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US (1) | US20090227115A1 (ja) |
JP (1) | JPWO2007138921A1 (ja) |
KR (1) | KR20090023351A (ja) |
CN (1) | CN101454879A (ja) |
TW (1) | TW200745313A (ja) |
WO (1) | WO2007138921A1 (ja) |
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JP2010093126A (ja) * | 2008-10-09 | 2010-04-22 | Kanto Chem Co Inc | 基板処理用アルカリ性水溶液組成物 |
JP2010135591A (ja) * | 2008-12-05 | 2010-06-17 | Asahi Kasei Chemicals Corp | シリコンウェハーエッチング剤及びそれを用いたエッチング方法 |
JP2010135593A (ja) * | 2008-12-05 | 2010-06-17 | Asahi Kasei Chemicals Corp | シリコンウェハーエッチング剤及びそれを用いたエッチング方法 |
KR101033060B1 (ko) * | 2009-01-28 | 2011-05-06 | 주식회사 엘지실트론 | 알칼리 에칭방법 및 이를 이용한 웨이퍼 가공방법 |
WO2014024414A1 (ja) * | 2012-08-10 | 2014-02-13 | 第一工業製薬株式会社 | テクスチャー形成用エッチング液およびそれを用いたテクスチャー形成方法 |
JP2014507815A (ja) * | 2011-03-11 | 2014-03-27 | フジフィルム・エレクトロニック・マテリアルズ・ユーエスエイ・インコーポレイテッド | 新規なエッチング組成物 |
JP2015191946A (ja) * | 2014-03-27 | 2015-11-02 | 第一工業製薬株式会社 | テクスチャー形成用エッチング液およびそれを用いたテクスチャー形成方法 |
WO2016152513A1 (ja) * | 2015-03-23 | 2016-09-29 | ソニー株式会社 | 半導体装置、および半導体装置の製造方法、固体撮像素子、撮像装置、並びに電子機器 |
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KR101477360B1 (ko) * | 2009-06-22 | 2015-01-02 | 캐보트 마이크로일렉트로닉스 코포레이션 | 폴리규소 제거 속도를 억제하기 위한 cmp 조성물 및 방법 |
JP6101421B2 (ja) | 2010-08-16 | 2017-03-22 | インテグリス・インコーポレーテッド | 銅または銅合金用エッチング液 |
KR102397087B1 (ko) * | 2015-06-29 | 2022-05-12 | 동우 화인켐 주식회사 | 폴리실리콘 식각액 조성물 |
JP6761166B2 (ja) * | 2015-07-23 | 2020-09-23 | セントラル硝子株式会社 | ウェットエッチング方法及びエッチング液 |
CN110799466B (zh) * | 2017-08-31 | 2022-09-06 | 日本电气硝子株式会社 | 玻璃的蚀刻方法和蚀刻处理装置以及玻璃板 |
KR102678071B1 (ko) * | 2019-01-08 | 2024-06-24 | 동우 화인켐 주식회사 | 실리콘 막 식각액 조성물 및 이를 사용한 패턴 형성 방법 |
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WO2016152513A1 (ja) * | 2015-03-23 | 2016-09-29 | ソニー株式会社 | 半導体装置、および半導体装置の製造方法、固体撮像素子、撮像装置、並びに電子機器 |
Also Published As
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KR20090023351A (ko) | 2009-03-04 |
JPWO2007138921A1 (ja) | 2009-10-01 |
TW200745313A (en) | 2007-12-16 |
CN101454879A (zh) | 2009-06-10 |
US20090227115A1 (en) | 2009-09-10 |
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