WO2019167971A1 - アルミナの保護液、保護方法及びこれを用いたアルミナ層を有する半導体基板の製造方法 - Google Patents
アルミナの保護液、保護方法及びこれを用いたアルミナ層を有する半導体基板の製造方法 Download PDFInfo
- Publication number
- WO2019167971A1 WO2019167971A1 PCT/JP2019/007409 JP2019007409W WO2019167971A1 WO 2019167971 A1 WO2019167971 A1 WO 2019167971A1 JP 2019007409 W JP2019007409 W JP 2019007409W WO 2019167971 A1 WO2019167971 A1 WO 2019167971A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- barium
- alumina
- beryllium
- strontium
- magnesium
- Prior art date
Links
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 165
- 230000001681 protective effect Effects 0.000 title claims abstract description 61
- 239000004065 semiconductor Substances 0.000 title claims abstract description 53
- 239000000758 substrate Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 239000012530 fluid Substances 0.000 title abstract 3
- 229910052790 beryllium Inorganic materials 0.000 claims abstract description 25
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052788 barium Inorganic materials 0.000 claims abstract description 10
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims abstract description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 4
- 239000011777 magnesium Substances 0.000 claims abstract description 4
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 4
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 36
- -1 beryllium peroxide Chemical class 0.000 claims description 20
- 150000001341 alkaline earth metal compounds Chemical class 0.000 claims description 16
- 239000002253 acid Substances 0.000 claims description 14
- IWOUKMZUPDVPGQ-UHFFFAOYSA-N barium nitrate Chemical compound [Ba+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O IWOUKMZUPDVPGQ-UHFFFAOYSA-N 0.000 claims description 14
- 150000003839 salts Chemical class 0.000 claims description 13
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 claims description 11
- 229910001863 barium hydroxide Inorganic materials 0.000 claims description 11
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 8
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 claims description 8
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 8
- ITHZDDVSAWDQPZ-UHFFFAOYSA-L barium acetate Chemical compound [Ba+2].CC([O-])=O.CC([O-])=O ITHZDDVSAWDQPZ-UHFFFAOYSA-L 0.000 claims description 7
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 claims description 7
- 229910001626 barium chloride Inorganic materials 0.000 claims description 7
- XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical compound [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 claims description 6
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 6
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 6
- LWBPNIJBHRISSS-UHFFFAOYSA-L beryllium dichloride Chemical compound Cl[Be]Cl LWBPNIJBHRISSS-UHFFFAOYSA-L 0.000 claims description 6
- WPJWIROQQFWMMK-UHFFFAOYSA-L beryllium dihydroxide Chemical compound [Be+2].[OH-].[OH-] WPJWIROQQFWMMK-UHFFFAOYSA-L 0.000 claims description 6
- 229910001865 beryllium hydroxide Inorganic materials 0.000 claims description 6
- RFVVBBUVWAIIBT-UHFFFAOYSA-N beryllium nitrate Chemical compound [Be+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O RFVVBBUVWAIIBT-UHFFFAOYSA-N 0.000 claims description 6
- KQHXBDOEECKORE-UHFFFAOYSA-L beryllium sulfate Chemical compound [Be+2].[O-]S([O-])(=O)=O KQHXBDOEECKORE-UHFFFAOYSA-L 0.000 claims description 6
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 6
- 239000000347 magnesium hydroxide Substances 0.000 claims description 6
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 6
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 claims description 6
- UUCCCPNEFXQJEL-UHFFFAOYSA-L strontium dihydroxide Chemical compound [OH-].[OH-].[Sr+2] UUCCCPNEFXQJEL-UHFFFAOYSA-L 0.000 claims description 6
- 229910001866 strontium hydroxide Inorganic materials 0.000 claims description 6
- DHEQXMRUPNDRPG-UHFFFAOYSA-N strontium nitrate Chemical compound [Sr+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O DHEQXMRUPNDRPG-UHFFFAOYSA-N 0.000 claims description 6
- IATRAKWUXMZMIY-UHFFFAOYSA-N strontium oxide Chemical compound [O-2].[Sr+2] IATRAKWUXMZMIY-UHFFFAOYSA-N 0.000 claims description 6
- UBXAKNTVXQMEAG-UHFFFAOYSA-L strontium sulfate Chemical compound [Sr+2].[O-]S([O-])(=O)=O UBXAKNTVXQMEAG-UHFFFAOYSA-L 0.000 claims description 6
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 4
- ISFLYIRWQDJPDR-UHFFFAOYSA-L barium chlorate Chemical compound [Ba+2].[O-]Cl(=O)=O.[O-]Cl(=O)=O ISFLYIRWQDJPDR-UHFFFAOYSA-L 0.000 claims description 4
- QFFVPLLCYGOFPU-UHFFFAOYSA-N barium chromate Chemical compound [Ba+2].[O-][Cr]([O-])(=O)=O QFFVPLLCYGOFPU-UHFFFAOYSA-N 0.000 claims description 4
- 229940083898 barium chromate Drugs 0.000 claims description 4
- UNLSXXHOHZUADN-UHFFFAOYSA-N barium cyanide Chemical compound [Ba+2].N#[C-].N#[C-] UNLSXXHOHZUADN-UHFFFAOYSA-N 0.000 claims description 4
- SGUXGJPBTNFBAD-UHFFFAOYSA-L barium iodide Chemical compound [I-].[I-].[Ba+2] SGUXGJPBTNFBAD-UHFFFAOYSA-L 0.000 claims description 4
- 229910001638 barium iodide Inorganic materials 0.000 claims description 4
- 229940075444 barium iodide Drugs 0.000 claims description 4
- OOULUYZFLXDWDQ-UHFFFAOYSA-L barium perchlorate Chemical compound [Ba+2].[O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O OOULUYZFLXDWDQ-UHFFFAOYSA-L 0.000 claims description 4
- ZJRXSAYFZMGQFP-UHFFFAOYSA-N barium peroxide Chemical compound [Ba+2].[O-][O-] ZJRXSAYFZMGQFP-UHFFFAOYSA-N 0.000 claims description 4
- CJDPJFRMHVXWPT-UHFFFAOYSA-N barium sulfide Chemical compound [S-2].[Ba+2] CJDPJFRMHVXWPT-UHFFFAOYSA-N 0.000 claims description 4
- ARSLNKYOPNUFFY-UHFFFAOYSA-L barium sulfite Chemical compound [Ba+2].[O-]S([O-])=O ARSLNKYOPNUFFY-UHFFFAOYSA-L 0.000 claims description 4
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 claims description 4
- FRWYFWZENXDZMU-UHFFFAOYSA-N 2-iodoquinoline Chemical compound C1=CC=CC2=NC(I)=CC=C21 FRWYFWZENXDZMU-UHFFFAOYSA-N 0.000 claims description 3
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims description 3
- MPCRDALPQLDDFX-UHFFFAOYSA-L Magnesium perchlorate Chemical compound [Mg+2].[O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O MPCRDALPQLDDFX-UHFFFAOYSA-L 0.000 claims description 3
- SPAGIJMPHSUYSE-UHFFFAOYSA-N Magnesium peroxide Chemical compound [Mg+2].[O-][O-] SPAGIJMPHSUYSE-UHFFFAOYSA-N 0.000 claims description 3
- NKQIMNKPSDEDMO-UHFFFAOYSA-L barium bromide Chemical compound [Br-].[Br-].[Ba+2] NKQIMNKPSDEDMO-UHFFFAOYSA-L 0.000 claims description 3
- 229910001620 barium bromide Inorganic materials 0.000 claims description 3
- PBKYCFJFZMEFRS-UHFFFAOYSA-L beryllium bromide Chemical compound [Be+2].[Br-].[Br-] PBKYCFJFZMEFRS-UHFFFAOYSA-L 0.000 claims description 3
- 229910001621 beryllium bromide Inorganic materials 0.000 claims description 3
- ZBUQRSWEONVBES-UHFFFAOYSA-L beryllium carbonate Chemical compound [Be+2].[O-]C([O-])=O ZBUQRSWEONVBES-UHFFFAOYSA-L 0.000 claims description 3
- 229910000023 beryllium carbonate Inorganic materials 0.000 claims description 3
- 229910001627 beryllium chloride Inorganic materials 0.000 claims description 3
- 229910001639 beryllium iodide Inorganic materials 0.000 claims description 3
- JUCWKFHIHJQTFR-UHFFFAOYSA-L beryllium iodide Chemical compound [Be+2].[I-].[I-] JUCWKFHIHJQTFR-UHFFFAOYSA-L 0.000 claims description 3
- LTPBRCUWZOMYOC-UHFFFAOYSA-N beryllium oxide Inorganic materials O=[Be] LTPBRCUWZOMYOC-UHFFFAOYSA-N 0.000 claims description 3
- FQDSYGKTHDFFCM-UHFFFAOYSA-N beryllium sulfide Chemical compound S=[Be] FQDSYGKTHDFFCM-UHFFFAOYSA-N 0.000 claims description 3
- SJTGEWBHZOQEKZ-UHFFFAOYSA-L beryllium sulfite Chemical compound [Be+2].[O-]S([O-])=O SJTGEWBHZOQEKZ-UHFFFAOYSA-L 0.000 claims description 3
- YUOUKRIPFJKDJY-UHFFFAOYSA-L beryllium;diacetate Chemical compound [Be+2].CC([O-])=O.CC([O-])=O YUOUKRIPFJKDJY-UHFFFAOYSA-L 0.000 claims description 3
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims description 3
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 claims description 3
- UEGPKNKPLBYCNK-UHFFFAOYSA-L magnesium acetate Chemical compound [Mg+2].CC([O-])=O.CC([O-])=O UEGPKNKPLBYCNK-UHFFFAOYSA-L 0.000 claims description 3
- 239000011654 magnesium acetate Substances 0.000 claims description 3
- 235000011285 magnesium acetate Nutrition 0.000 claims description 3
- 229940069446 magnesium acetate Drugs 0.000 claims description 3
- OTCKOJUMXQWKQG-UHFFFAOYSA-L magnesium bromide Chemical compound [Mg+2].[Br-].[Br-] OTCKOJUMXQWKQG-UHFFFAOYSA-L 0.000 claims description 3
- 229910001623 magnesium bromide Inorganic materials 0.000 claims description 3
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 3
- 239000001095 magnesium carbonate Substances 0.000 claims description 3
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 3
- FKWSMBAMOQCVPV-UHFFFAOYSA-N magnesium dicyanide Chemical compound [Mg+2].N#[C-].N#[C-] FKWSMBAMOQCVPV-UHFFFAOYSA-N 0.000 claims description 3
- BLQJIBCZHWBKSL-UHFFFAOYSA-L magnesium iodide Chemical compound [Mg+2].[I-].[I-] BLQJIBCZHWBKSL-UHFFFAOYSA-L 0.000 claims description 3
- 229910001641 magnesium iodide Inorganic materials 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- 229960004995 magnesium peroxide Drugs 0.000 claims description 3
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 3
- QENHCSSJTJWZAL-UHFFFAOYSA-N magnesium sulfide Chemical compound [Mg+2].[S-2] QENHCSSJTJWZAL-UHFFFAOYSA-N 0.000 claims description 3
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 3
- NNNSKJSUQWKSAM-UHFFFAOYSA-L magnesium;dichlorate Chemical compound [Mg+2].[O-]Cl(=O)=O.[O-]Cl(=O)=O NNNSKJSUQWKSAM-UHFFFAOYSA-L 0.000 claims description 3
- CRGGPIWCSGOBDN-UHFFFAOYSA-N magnesium;dioxido(dioxo)chromium Chemical compound [Mg+2].[O-][Cr]([O-])(=O)=O CRGGPIWCSGOBDN-UHFFFAOYSA-N 0.000 claims description 3
- LOCZQLKNTOXJDV-UHFFFAOYSA-N magnesium;oxido(oxo)borane Chemical compound [Mg+2].[O-]B=O.[O-]B=O LOCZQLKNTOXJDV-UHFFFAOYSA-N 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- JESHZQPNPCJVNG-UHFFFAOYSA-L magnesium;sulfite Chemical compound [Mg+2].[O-]S([O-])=O JESHZQPNPCJVNG-UHFFFAOYSA-L 0.000 claims description 3
- YJPVTCSBVRMESK-UHFFFAOYSA-L strontium bromide Chemical compound [Br-].[Br-].[Sr+2] YJPVTCSBVRMESK-UHFFFAOYSA-L 0.000 claims description 3
- 229910001625 strontium bromide Inorganic materials 0.000 claims description 3
- 229940074155 strontium bromide Drugs 0.000 claims description 3
- 229910000018 strontium carbonate Inorganic materials 0.000 claims description 3
- FRTABACCYANHFP-UHFFFAOYSA-L strontium chlorate Chemical compound [Sr+2].[O-]Cl(=O)=O.[O-]Cl(=O)=O FRTABACCYANHFP-UHFFFAOYSA-L 0.000 claims description 3
- 229910001631 strontium chloride Inorganic materials 0.000 claims description 3
- NVKTUNLPFJHLCG-UHFFFAOYSA-N strontium chromate Chemical compound [Sr+2].[O-][Cr]([O-])(=O)=O NVKTUNLPFJHLCG-UHFFFAOYSA-N 0.000 claims description 3
- AHBGXTDRMVNFER-UHFFFAOYSA-L strontium dichloride Chemical compound [Cl-].[Cl-].[Sr+2] AHBGXTDRMVNFER-UHFFFAOYSA-L 0.000 claims description 3
- KRIJWFBRWPCESA-UHFFFAOYSA-L strontium iodide Chemical compound [Sr+2].[I-].[I-] KRIJWFBRWPCESA-UHFFFAOYSA-L 0.000 claims description 3
- 229910001643 strontium iodide Inorganic materials 0.000 claims description 3
- UHCGLDSRFKGERO-UHFFFAOYSA-N strontium peroxide Chemical compound [Sr+2].[O-][O-] UHCGLDSRFKGERO-UHFFFAOYSA-N 0.000 claims description 3
- RXSHXLOMRZJCLB-UHFFFAOYSA-L strontium;diacetate Chemical compound [Sr+2].CC([O-])=O.CC([O-])=O RXSHXLOMRZJCLB-UHFFFAOYSA-L 0.000 claims description 3
- WTNNIXSCSYFNFP-UHFFFAOYSA-N strontium;dicyanide Chemical compound [Sr+2].N#[C-].N#[C-] WTNNIXSCSYFNFP-UHFFFAOYSA-N 0.000 claims description 3
- MXRFIUHRIOLIIV-UHFFFAOYSA-L strontium;diperchlorate Chemical compound [Sr+2].[O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O MXRFIUHRIOLIIV-UHFFFAOYSA-L 0.000 claims description 3
- UIPNVCZMXRSSMM-UHFFFAOYSA-N strontium;oxido(oxo)borane Chemical compound [Sr+2].[O-]B=O.[O-]B=O UIPNVCZMXRSSMM-UHFFFAOYSA-N 0.000 claims description 3
- ZEGFMFQPWDMMEP-UHFFFAOYSA-N strontium;sulfide Chemical compound [S-2].[Sr+2] ZEGFMFQPWDMMEP-UHFFFAOYSA-N 0.000 claims description 3
- VTBSJEPGLHXIIS-UHFFFAOYSA-L strontium;sulfite Chemical compound [Sr+2].[O-]S([O-])=O VTBSJEPGLHXIIS-UHFFFAOYSA-L 0.000 claims description 3
- VGTPKLINSHNZRD-UHFFFAOYSA-N oxoborinic acid Chemical compound OB=O VGTPKLINSHNZRD-UHFFFAOYSA-N 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 18
- 238000005260 corrosion Methods 0.000 abstract description 18
- 150000002736 metal compounds Chemical class 0.000 abstract 2
- 239000010408 film Substances 0.000 description 39
- 239000000243 solution Substances 0.000 description 37
- 239000010410 layer Substances 0.000 description 34
- 238000004140 cleaning Methods 0.000 description 29
- 239000011229 interlayer Substances 0.000 description 19
- 238000001312 dry etching Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 238000011282 treatment Methods 0.000 description 10
- 239000000126 substance Substances 0.000 description 9
- 235000012431 wafers Nutrition 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 238000007654 immersion Methods 0.000 description 5
- 229910021642 ultra pure water Inorganic materials 0.000 description 4
- 239000012498 ultrapure water Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- QBLDFAIABQKINO-UHFFFAOYSA-N barium borate Chemical compound [Ba+2].[O-]B=O.[O-]B=O QBLDFAIABQKINO-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- GPXJNWSHGFTCBW-UHFFFAOYSA-N Indium phosphide Chemical compound [In]#P GPXJNWSHGFTCBW-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
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- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 150000001553 barium compounds Chemical class 0.000 description 1
- OYLGJCQECKOTOL-UHFFFAOYSA-L barium fluoride Chemical compound [F-].[F-].[Ba+2] OYLGJCQECKOTOL-UHFFFAOYSA-L 0.000 description 1
- 229910001632 barium fluoride Inorganic materials 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 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
- 238000005520 cutting process Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
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- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical class O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 229910052705 radium Inorganic materials 0.000 description 1
- HCWPIIXVSYCSAN-UHFFFAOYSA-N radium atom Chemical compound [Ra] HCWPIIXVSYCSAN-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 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
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- MAKDTFFYCIMFQP-UHFFFAOYSA-N titanium tungsten Chemical compound [Ti].[W] MAKDTFFYCIMFQP-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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- H01L21/0206—Cleaning during device manufacture during, before or after processing of insulating layers
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- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
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- 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
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- H01L21/76829—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers
Definitions
- the present invention relates to a protective solution for suppressing corrosion of alumina in a manufacturing process of a semiconductor integrated circuit, an alumina protection method, and a method of manufacturing a semiconductor substrate having an alumina layer using the same.
- Non-Patent Document 1 In the cleaning process of the semiconductor integrated circuit with the cleaning liquid, dry etching residues, resists, hard masks, and the like are removed. Generally, in this cleaning process, it is required not to corrode materials other than the removal target. In recent years, with the miniaturization of design rules, the structure of the gate of a transistor has been changed from a combination of silicon oxide and polycrystalline silicon to a combination of a high dielectric constant material and a metal. In some cases, alumina is used as the high dielectric constant material. Further, when forming a via by dry etching, a fluorine-based gas is selected, but alumina may be selected as an etch stop layer because of its high resistance to the fluorine-based gas (Non-Patent Document 1). .
- alumina may be used as a material for the hard mask (Patent Document 1).
- alumina is sometimes used in the semiconductor integrated circuit and the manufacturing process thereof, but a cleaning solution containing a fluorine compound, an oxidizing agent, an alkali, or the like generally used in the cleaning step comes into contact with the alumina.
- a cleaning solution containing a fluorine compound, an oxidizing agent, an alkali, or the like generally used in the cleaning step comes into contact with the alumina.
- a cleaning solution containing a fluorine compound, an oxidizing agent, an alkali, or the like generally used in the cleaning step comes into contact with the alumina.
- the alumina is severely corroded. Therefore, there is a strong demand for a method for suppressing corrosion on alumina in a cleaning process in which these cleaning liquids are used.
- An object of the present invention is to provide a protective solution for alumina, a protective method, and a method for manufacturing a semiconductor substrate having an alumina layer using the same.
- the present invention is as follows.
- An alumina protective liquid (protective film forming liquid) containing 0.0001 to 20% by mass of an alkaline earth metal compound, wherein the alkaline earth metal is selected from the group consisting of beryllium, magnesium, strontium and barium 1 or more of an alumina protective solution.
- the alkaline earth metal compound is Beryllium nitrate, beryllium acetate, beryllium chloride, beryllium hydroxide, beryllium sulfite, beryllium chlorate, beryllium peroxide, beryllium peroxide, beryllium chromate, beryllium oxide, beryllium cyanide, beryllium bromide, beryllium carbonate, beryllium metaborate , Beryllium iodide, beryllium tetrafluoroborate, beryllium sulfate, beryllium sulfide, and salts obtained by reacting beryllium hydroxide with an acid;
- the method for protecting alumina according to the present invention includes a step of treating at least a part of the surface of the alumina layer containing alumina using the alumina protective liquid according to any one of [1] to [6].
- substrate of this invention is a manufacturing method of the semiconductor substrate which has an alumina layer, Comprising: The process of protecting the alumina contained in an alumina layer using the protection method of an alumina as described in [7] is included.
- a protective film is formed on at least a part of the surface of the alumina layer by treating at least a part of the surface of the alumina layer with an alumina protective liquid, and the alumina contained in the alumina layer is It can be protected from corrosion by chemicals such as cleaning liquid.
- an alumina protective solution containing an alkaline earth metal compound is used.
- an alumina protective solution, a protection method, and a method for producing a semiconductor substrate having an alumina layer using the same will be described in detail.
- the alkaline earth metal compound used in the present invention is an inorganic substance containing one or more metals selected from the group consisting of beryllium, magnesium, strontium, and barium. These have the effect of forming a protective film on at least a part of the surface of the alumina layer. For example, corrosion of the alumina by the cleaning liquid in the cleaning process after the protective film is formed can be suppressed. Calcium of the same genus has insufficient anticorrosion performance against alkalis, and radium is expensive and often unstable as a compound and is not suitable for use.
- alkaline earth metal compounds include Beryllium nitrate, beryllium acetate, beryllium chloride, beryllium hydroxide, beryllium sulfite, beryllium chlorate, beryllium peroxide, beryllium peroxide, beryllium chromate, beryllium oxide, beryllium cyanide, beryllium bromide, beryllium carbonate, beryllium metaborate , Beryllium iodide, beryllium tetrafluoroborate, beryllium sulfate, beryllium sulfide, and salts obtained by reacting beryllium hydroxide with an acid;
- barium compounds namely barium nitrate, barium acetate, barium chloride, barium hydroxide, barium sulfite, barium chlorate, barium perchlorate, barium peroxide, barium chromate, barium oxide, barium cyanide, odor
- barium fluoride, barium carbonate, barium metaborate, barium iodide, barium tetrafluoroborate, barium sulfate, barium sulfide, and a salt obtained by reacting barium hydroxide with an acid are preferable because they have a high corrosion inhibitory effect on alumina.
- the concentration (content) of the alkaline earth metal compound in the alumina protective solution of the present invention is 0.0001 to 20% by mass, preferably 0.00025 to 17.5% by mass, more preferably 0.0005 to 15% by mass. Particularly preferably, the content is 0.001 to 10% by mass, more preferably more than 1% by mass, and still more preferably 1.5 to 10% by mass. By being in this range, a protective film can be formed on at least a part of the alumina surface, and damage to the alumina can be effectively suppressed.
- the alumina protective solution of the present invention may be blended with components conventionally used in semiconductor compositions as long as it does not impair the purpose of the present invention.
- components conventionally used in semiconductor compositions for example, alkalis, acids, chelating agents, surfactants, antifoaming agents, oxidizing agents, reducing agents, metal anticorrosives, water-soluble organic solvents, and the like can be added as additives.
- the balance of the alumina protective solution of the present invention is water.
- the water that can be used in the present invention is not particularly limited, but water from which metal ions, organic impurities, particles, and the like have been removed by distillation, ion exchange treatment, filter treatment, various adsorption treatments, and the like is preferable, and pure water is more preferable. Ultrapure water is particularly preferable.
- the concentration (content) of water in the alumina protective solution is preferably 70 to 100% by mass, more preferably 90 to 100% by mass, still more preferably 95 to 100% by mass, and particularly preferably 98 to 100% by mass. .
- the alumina protective solution of the present invention is prepared by adding water (preferably ultrapure water) to the alkaline earth metal compound and other components as necessary and stirring until uniform.
- the alumina protective solution of the present invention is preferably substantially free of hydrogen peroxide, and the concentration (content) of hydrogen peroxide in the alumina protective solution is more preferably less than 0.002% by mass. .
- the temperature at which the alumina protective solution of the present invention is used is usually 20 to 70 ° C., preferably 30 to 60 ° C., particularly preferably 40 to 55 ° C. What is necessary is just to select suitably the use conditions of an alumina protective liquid with the semiconductor substrate used.
- the time for using the alumina protective solution of the present invention is usually 0.2 to 60 minutes. What is necessary is just to select suitably the use conditions of an alumina protective liquid with the semiconductor substrate used.
- a protective film can be suitably formed on at least a part of the surface of the alumina layer of the semiconductor substrate, and the alumina contained in the alumina layer can be protected.
- the thickness of the protective film is not particularly limited. According to a preferred embodiment of the present invention, by treating at least a part of the surface of the alumina layer with the alumina protective liquid of the present invention, the alumina contained in the alumina layer can be protected from corrosion due to a chemical liquid such as a cleaning liquid. .
- the alumina protective liquid used in the present invention can be added to the cleaning liquid used in the semiconductor substrate cleaning process, and the alumina can be cleaned while protecting the alumina.
- an inorganic substance containing barium is contained as the alkaline earth metal compound, the semiconductor substrate can be suitably cleaned, and corrosion of alumina by the cleaning liquid can be suppressed.
- semiconductor substrate As a semiconductor substrate that can be suitably used in the present invention, Substrate materials such as silicon, amorphous silicon, polysilicon, glass; Insulating materials such as silicon oxide, silicon nitride, silicon carbide and their derivatives; Materials such as cobalt, cobalt alloy, tungsten, titanium-tungsten; Substrates using compound semiconductors such as gallium-arsenide, gallium-phosphorus, indium-phosphorus, indium-gallium-arsenic, indium-aluminum-arsenic, and oxide semiconductors such as chromium oxide, particularly low dielectric constant interlayer insulating films
- the semiconductor substrate having any material has an alumina layer containing alumina.
- an alumina layer is provided as an etch stop layer and a hard mask.
- the content of alumina in the alumina layer is preferably 30% by mass or more, more preferably 50% by mass or more, further preferably 70% by mass or more, still more preferably 90% by mass or more, and particularly preferably 100% by mass.
- the method for protecting alumina of the present invention includes a step of treating at least a part of the surface of the alumina layer with the alumina protective solution of the present invention.
- the treatment is performed by bringing the alumina protective solution of the present invention into contact with at least a part of the surface of the alumina layer.
- the operating temperature and operating time of the alumina protective liquid of the present invention are as described in the above “Usage method of alumina protective liquid”.
- the method for bringing the alumina protective solution of the present invention into contact with the surface of the alumina layer is not particularly limited.
- a method of immersing the surface of the alumina layer in the alumina protective liquid of the present invention can be employed. Any method may be employed in the present invention.
- the alumina contained in the alumina layer can be protected from corrosion by a chemical solution such as a cleaning solution, and the corrosion of alumina can be suppressed.
- the manufacturing method of the semiconductor substrate of this invention includes the process of protecting the alumina contained in the alumina layer which a semiconductor substrate has using the protection method of the alumina of this invention.
- the alumina contained in the alumina layer can be protected from corrosion by chemicals such as a cleaning solution, and the semiconductor substrate can be manufactured without inhibiting the corrosion of alumina and affecting the electrical characteristics.
- the use temperature and use time of the composition of the present invention are as described in the above “Method for using alumina protective solution”.
- the method of bringing the composition of the present invention into contact with the surface of the alumina layer of the semiconductor substrate is also as described in the above “Alumina protection method”.
- 1 to 5 show an example of a cross-sectional structure of a semiconductor substrate having an alumina layer.
- FIG. 1 is a schematic diagram of a cross-sectional view of an embodiment of a semiconductor substrate having a low dielectric constant interlayer insulating film in a semiconductor substrate before dry etching residue removal when the bottom of the via is alumina.
- a via is formed in the low dielectric constant interlayer insulating film 6 by dry etching, and the bottom of the via is alumina 1.
- the dry etching residue 2 is attached to the surface of the via and the low dielectric constant interlayer insulating film 6.
- FIG. 2 is a schematic diagram of a cross-sectional view of one embodiment of a semiconductor substrate having a low dielectric constant interlayer insulating film in a semiconductor substrate before removal of dry etching residues when the hard mask is alumina.
- an alumina-based hard mask 3 is laminated on a low dielectric constant interlayer insulating film 6, and vias are formed thereon by dry etching.
- the dry etching residue 2 is attached to the surface of the via and the alumina hard mask 3.
- FIG. 3 is a schematic diagram of a cross-sectional view of one embodiment of a semiconductor substrate having a low dielectric constant interlayer insulating film in a semiconductor substrate before removal of a hard mask (excluding an alumina-based hard mask) when the via bottom is alumina. is there.
- a hard mask (excluding an alumina hard mask) 4 is laminated on a low dielectric constant interlayer insulating film 6, and a via is formed in the hard mask.
- the bottom of the via is alumina 1.
- FIG. 4 is a schematic diagram of a cross-sectional view of one embodiment of a semiconductor substrate having a low dielectric constant interlayer insulating film in a semiconductor substrate before resist removal when the bottom of the via is alumina.
- a resist 5 is laminated on a low dielectric constant interlayer insulating film 6, and a via is formed in this.
- the bottom of the via is alumina 1.
- FIG. 5 is a schematic diagram of a cross-sectional view of one embodiment of a semiconductor substrate having a low dielectric constant interlayer insulating film in a semiconductor substrate before resist removal when the hard mask is alumina.
- an alumina-based hard mask 3 and a resist 5 are laminated in this order on a low dielectric constant interlayer insulating film 6, and a via is formed in this layer. The bottom of the via is a low dielectric constant interlayer insulating film 6.
- the alumina protective liquid of the present invention In the method for producing a semiconductor substrate of the present invention, at various stages where the alumina layer of such a semiconductor substrate is exposed on the surface, the surface of the alumina layer is protected by using the alumina protective liquid of the present invention, and thereafter In this step, the alumina contained in the alumina layer can be protected from corrosion by a chemical solution such as a cleaning solution, and the corrosion of alumina can be suppressed. According to a preferred aspect of the present invention, a high-precision and high-quality semiconductor substrate can be manufactured with high yield without affecting electrical characteristics.
- ⁇ Wafer with Film for Evaluation> For Evaluation of Damage to Alumina A chip piece obtained by cutting a 12-inch film-coated wafer (alumina film thickness of 300 mm) formed with alumina into 1 cm ⁇ 1 cm was used.
- Examples 1 to 13 and Comparative Examples 1 to 7 In Examples 1 to 13 and Comparative Example 1, the wafer with the alumina film was immersed in the protective liquid described in Table 1 at 50 ° C. for 1 minute, and then immersed in the cleaning liquid at 50 ° C. for 0.5 minute. Water rinsing and dry nitrogen gas jetting were performed. By dividing the difference in film thickness between the wafers with the alumina film before and after the treatment by the immersion time of the cleaning liquid, R. was calculated. In Comparative Examples 2 to 7, the immersion treatment with the protective solution was omitted, and the substrate was immersed in the cleaning solution at 50 ° C. for 0.5 minutes, and then rinsed with ultrapure water and dried by dry nitrogen gas injection. E. R.
- Reference Examples 1 to 6 the wafer with an alumina film was immersed in a cleaning solution containing the alkaline earth metal compound shown in Table 2 at 50 ° C. for 5 minutes, and then rinsed with ultrapure water and dried by dry nitrogen gas injection. It was. By dividing the film thickness difference between the wafers with the alumina film before and after the treatment by the immersion time of the cleaning solution, R. was calculated. Compared to Reference Examples 3 to 6, in Reference Examples 1 and 2, it was found that corrosion of alumina by the cleaning liquid could be suppressed by adding an inorganic substance containing barium to the cleaning liquid.
- Alumina 2 Dry etching residue 3: Alumina hard mask 4: Hard mask (other than alumina) 5: Resist 6: Low dielectric constant interlayer insulating film
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Abstract
Description
近年、デザインルールの微細化に伴い、トランジスタのゲートの構成が酸化シリコンと多結晶シリコンの組み合わせから高誘電率材料と金属の組み合わせに変更されるようになってきた。この高誘電率材料として、アルミナが用いられる場合がある。
また、ドライエッチングでビアを形成する際、フッ素系のガスが選択されるが、フッ素系のガスへの耐性が高い点からエッチストップ層としてアルミナが選択される場合がある(非特許文献1)。
さらに、ハードマスクの材質としてアルミナが用いられる場合もある(特許文献1)。
以上のように、半導体集積回路及びその製造工程では、アルミナが使用されることがあるが、洗浄工程において一般的に使用されるフッ素化合物や酸化剤、アルカリなどを含む洗浄液がアルミナと接液する場合、アルミナを激しく腐食してしまう問題がある。そのため、これらの洗浄液が使用される洗浄工程において、アルミナへの腐食を抑制する方法が強く求められている。
[2] 前記アルカリ土類金属化合物が、
硝酸ベリリウム、酢酸ベリリウム、塩化ベリリウム、水酸化ベリリウム、亜硫酸ベリリウム、塩素酸ベリリウム、過塩素酸ベリリウム、過酸化ベリリウム、クロム酸ベリリウム、酸化ベリリウム、シアン化ベリリウム、臭化ベリリウム、炭酸ベリリウム、メタホウ酸ベリリウム、ヨウ化ベリリウム、テトラフルオロホウ酸ベリリウム、硫酸ベリリウム、硫化ベリリウム、及び水酸化ベリリウムと酸を反応させた塩;
硝酸マグネシウム、酢酸マグネシウム、塩化マグネシウム、水酸化マグネシウム、亜硫酸マグネシウム、塩素酸マグネシウム、過塩素酸マグネシウム、過酸化マグネシウム、クロム酸マグネシウム、酸化マグネシウム、シアン化マグネシウム、臭化マグネシウム、炭酸マグネシウム、メタホウ酸マグネシウム、ヨウ化マグネシウム、テトラフルオロホウ酸マグネシウム、硫酸マグネシウム、硫化マグネシウム、及び水酸化マグネシウムと酸を反応させた塩;
硝酸ストロンチウム、酢酸ストロンチウム、塩化ストロンチウム、水酸化ストロンチウム、亜硫酸ストロンチウム、塩素酸ストロンチウム、過塩素酸ストロンチウム、過酸化ストロンチウム、クロム酸ストロンチウム、酸化ストロンチウム、シアン化ストロンチウム、臭化ストロンチウム、炭酸ストロンチウム、メタホウ酸ストロンチウム、ヨウ化ストロンチウム、テトラフルオロホウ酸ストロンチウム、硫酸ストロンチウム、硫化ストロンチウム、及び水酸化ストロンチウムと酸を反応させた塩;並びに
硝酸バリウム、酢酸バリウム、塩化バリウム、水酸化バリウム、亜硫酸バリウム、塩素酸バリウム、過塩素酸バリウム、過酸化バリウム、クロム酸バリウム、酸化バリウム、シアン化バリウム、臭化バリウム、炭酸バリウム、メタホウ酸バリウム、ヨウ化バリウム、テトラフルオロホウ酸バリウム、硫酸バリウム、硫化バリウム、及び水酸化バリウムと酸を反応させた塩
からなる群より選択される1以上である、[1]に記載のアルミナ保護液。
[3] 前記アルカリ土類金属がバリウムである、[1]又は[2]に記載のアルミナ保護液。
[4] 前記アルカリ土類金属化合物が硝酸バリウム、酢酸バリウム、塩化バリウム及び水酸化バリウムからなる群より選択される1以上である、[1]~[3]のいずれか一項に記載のアルミナ保護液。
[5] 前記アルカリ土類金属化合物を1質量%超含有する、[1]~[4]のいずれか一項に記載のアルミナ保護液。
[6] 過酸化水素の含有量が0.002質量%未満である、[1]~[5]のいずれか一項に記載のアルミナ保護液。
[7] [1]~[6]のいずれか一項に記載のアルミナ保護液を用いたアルミナの保護方法。本発明のアルミナの保護方法は、[1]~[6]のいずれか一項に記載のアルミナ保護液を用いてアルミナを含有するアルミナ層の表面の少なくとも一部を処理する工程を含む。
[8] [7]に記載のアルミナの保護方法を用いた基板の製造方法。本発明の基板の製造方法は、アルミナ層を有する半導体基板の製造方法であって、[7]に記載のアルミナの保護方法を用いてアルミナ層に含有されるアルミナを保護する工程を含む。
本発明の好ましい態様によれば、アルミナ保護液でアルミナ層の表面の少なくとも一部を処理することで、アルミナ層の表面の少なくとも一部に保護膜が形成され、アルミナ層に含有されるアルミナを洗浄液などの薬液等による腐食から保護することができる。
(アルカリ土類金属化合物)
本発明で使用されるアルカリ土類金属化合物は、ベリリウム、マグネシウム、ストロンチウム、及びバリウムからなる群より選択される1以上の金属を含有する無機物である。これらはアルミナ層の表面の少なくとも一部に保護膜を形成する効果があり、例えば保護膜形成後の洗浄工程における洗浄液によるアルミナへの腐食を抑制できる。同属のカルシウムは、アルカリへの防食性能が十分ではなく、またラジウムは高価であり、かつ化合物として不安定な場合が多く使用に適さない。
アルカリ土類金属化合物の具体例としては、
硝酸ベリリウム、酢酸ベリリウム、塩化ベリリウム、水酸化ベリリウム、亜硫酸ベリリウム、塩素酸ベリリウム、過塩素酸ベリリウム、過酸化ベリリウム、クロム酸ベリリウム、酸化ベリリウム、シアン化ベリリウム、臭化ベリリウム、炭酸ベリリウム、メタホウ酸ベリリウム、ヨウ化ベリリウム、テトラフルオロホウ酸ベリリウム、硫酸ベリリウム、硫化ベリリウム、及び水酸化ベリリウムと酸を反応させた塩;
硝酸マグネシウム、酢酸マグネシウム、塩化マグネシウム、水酸化マグネシウム、亜硫酸マグネシウム、塩素酸マグネシウム、過塩素酸マグネシウム、過酸化マグネシウム、クロム酸マグネシウム、酸化マグネシウム、シアン化マグネシウム、臭化マグネシウム、炭酸マグネシウム、メタホウ酸マグネシウム、ヨウ化マグネシウム、テトラフルオロホウ酸マグネシウム、硫酸マグネシウム、硫化マグネシウム、及び水酸化マグネシウムと酸を反応させた塩;
硝酸ストロンチウム、酢酸ストロンチウム、塩化ストロンチウム、水酸化ストロンチウム、亜硫酸ストロンチウム、塩素酸ストロンチウム、過塩素酸ストロンチウム、過酸化ストロンチウム、クロム酸ストロンチウム、酸化ストロンチウム、シアン化ストロンチウム、臭化ストロンチウム、炭酸ストロンチウム、メタホウ酸ストロンチウム、ヨウ化ストロンチウム、テトラフルオロホウ酸ストロンチウム、硫酸ストロンチウム、硫化ストロンチウム、及び水酸化ストロンチウムと酸を反応させた塩;
硝酸バリウム、酢酸バリウム、塩化バリウム、水酸化バリウム、亜硫酸バリウム、塩素酸バリウム、過塩素酸バリウム、過酸化バリウム、クロム酸バリウム、酸化バリウム、シアン化バリウム、臭化バリウム、炭酸バリウム、メタホウ酸バリウム、ヨウ化バリウム、テトラフルオロホウ酸バリウム、硫酸バリウム、硫化バリウム、及び水酸化バリウムと酸を反応させた塩が挙げられ、これらは単独または2種類以上を組み合わせて使用できる。
これらの中でバリウム化合物、すなわち、硝酸バリウム、酢酸バリウム、塩化バリウム、水酸化バリウム、亜硫酸バリウム、塩素酸バリウム、過塩素酸バリウム、過酸化バリウム、クロム酸バリウム、酸化バリウム、シアン化バリウム、臭化バリウム、炭酸バリウム、メタホウ酸バリウム、ヨウ化バリウム、テトラフルオロホウ酸バリウム、硫酸バリウム、硫化バリウム、及び水酸化バリウムと酸を反応させた塩が、アルミナの腐食抑制効果が高いため、好ましい。さらに、硝酸バリウム、酢酸バリウム、塩化バリウム及び水酸化バリウムが高い水溶性があり、入手が容易なため特に好ましい。
本発明のアルミナ保護液中のアルカリ土類金属化合物の濃度(含有量)は0.0001~20質量%、好ましくは0.00025~17.5質量%、さらに好ましくは0.0005~15質量%、特に好ましくは0.001~10質量%、なお好ましくは1質量%超、さらになお好ましくは1.5~10質量%である。この範囲にあることでアルミナ表面の少なくとも一部に保護膜を形成でき、アルミナへのダメージを効果的に抑制できる。
本発明のアルミナ保護液には、所望により本発明の目的を損なわない範囲で従来から半導体用組成物に使用されている成分を配合してもよい。
例えば、添加剤として、アルカリ、酸、キレート剤、界面活性剤、消泡剤、酸化剤、還元剤、金属防食剤及び水溶性有機溶剤などを添加することができる。
本発明のアルミナ保護液の残部は水である。本発明に使用できる水としては、特に限定されないが、蒸留、イオン交換処理、フイルター処理、各種吸着処理などによって、金属イオンや有機不純物、パーテイクルなどが除去されたものが好ましく、純水がより好ましく、超純水が特に好ましい。
アルミナ保護液中の水の濃度(含有量)は、70~100質量%が好ましく、より好ましくは90~100質量%、さらに好ましくは95~100質量%、特に好ましくは98~100質量%である。
本発明のアルミナ保護液は、アルカリ土類金属化合物及び必要に応じてその他の成分に水(好ましくは超純水)を加えて均一になるまで攪拌することで調製される。
なお、本発明のアルミナ保護液は、過酸化水素を実質的に含まないことが好ましく、過酸化水素のアルミナ保護液中の濃度(含有量)は0.002質量%未満とすることがより好ましい。
本発明のアルミナ保護液を使用する温度は通常20~70℃、好ましくは30~60℃、特に好ましくは40~55℃である。アルミナ保護液の使用条件は、使用される半導体基板により適宜選択すればよい。
本発明のアルミナ保護液を使用する時間は通常0.2~60分である。アルミナ保護液の使用条件は、使用される半導体基板により適宜選択すればよい。
このような条件でアルミナ保護液を使用することで、半導体基板が有するアルミナ層の表面の少なくとも一部に好適に保護膜を形成し、アルミナ層に含有されるアルミナを保護することができる。なお、本発明において保護膜の厚みは特に制限されない。本発明の好ましい態様によれば、アルミナ層の表面の少なくとも一部を本発明のアルミナ保護液で処理することでアルミナ層に含有されるアルミナを洗浄液などの薬液等による腐食から保護することができる。
本発明で使用されるアルミナ保護液は、半導体基板の洗浄工程で使用される洗浄液に添加することもでき、アルミナを保護しつつ洗浄を行うことも出来る。このような場合は、アルカリ土類金属化合物としてバリウムを含有する無機物が含有されていることが好ましく、好適に半導体基板の洗浄を実施でき、洗浄液によるアルミナへの腐食を抑制できる。
本発明が好適に使用できる半導体基板としては、
シリコン、非晶質シリコン、ポリシリコン、ガラスなどの基板材料;
酸化シリコン、窒化シリコン、炭化シリコン及びこれらの誘導体などの絶縁材料;
コバルト、コバルト合金、タングステン、チタン-タングステンなどの材料;
ガリウム-砒素、ガリウム-リン、インジウム-リン、インジウム-ガリウム-砒素、インジウム-アルミニウム-砒素などの化合物半導体及びクロム酸化物などの酸化物半導体、特に低誘電率層間絶縁膜を使用している基板であり、いずれの材料を有する半導体基板も、アルミナを含有するアルミナ層を有する。具体的には、例えば、エッチストップ層及びハードマスクなどとしてアルミナ層を有する。
アルミナ層におけるアルミナの含有量は、好ましくは30質量%以上、より好ましくは50質量%以上、さらに好ましくは70質量%以上、さらにより好ましくは90質量%以上、特に好ましくは100質量%である。
本発明のアルミナの保護方法は、本発明のアルミナ保護液でアルミナ層の表面の少なくとも一部を処理する工程を含む。例えば、本発明のアルミナ保護液をアルミナ層の表面の少なくとも一部と接触させることで処理する。
本発明の半導体基板の製造方法は、本発明のアルミナの保護方法を用いて半導体基板が有するアルミナ層に含有されるアルミナを保護する工程を含む。これによりアルミナ層に含有されるアルミナを洗浄液などの薬液等による腐食から保護することができ、アルミナの腐食を抑制し、電気特性に影響を与えることなく、半導体基板を製造することができる。
尚、特に指定しない限り%は質量%を意味する。
アルミナが製膜された12インチの膜付きウェハ(アルミナの膜厚300Å)を、1cm×1cmにカットしたチップ片を用いた。
<E.R.(エッチングレート)>
アルミナ膜付きウェハを保護液による処理、及び洗浄液による処理を50℃で実施し、一連の処理の前後の膜厚差を洗浄液による処理時間で除することでE.R.を算出した。アルミナ膜付きウェハの膜厚は、n&kテクノロジー社製光学式膜厚計n&k1280を用いて測定した。
実施例1~13と比較例1では、表1に記した保護液にアルミナ膜付きウェハを50℃で1分間浸漬し、次いで、洗浄液に50℃で0.5分浸漬し、その後、超純水によるリンス、乾燥窒素ガス噴射による乾燥を行った。
処理前後のアルミナ膜付きウェハの膜厚差を洗浄液の浸漬時間で除することで、E.R.を算出した。
比較例2~7では、保護液による浸漬処理を省き、洗浄液に50℃で0.5分浸漬し、その後、超純水によるリンス、乾燥窒素ガス噴射による乾燥を行った。E.R.は上記と同様に算出した。
比較例2~7と比較して、実施例1~13では、保護液による浸漬処理を加えたことで、洗浄液によるアルミナへの腐食を抑制できていることがわかる。
比較例1では、カルシウムを含有する無機物を含む水溶液による浸漬を行っても、その後の洗浄液でアルミナへの腐食を抑制できていないことがわかる。
参考例1~6では、表2に記したアルカリ土類金属化合物を含む洗浄液にアルミナ膜付きウェハを50℃で5分浸漬し、その後、超純水によるリンス、乾燥窒素ガス噴射による乾燥を行った。処理前後のアルミナ膜付きウェハの膜厚差を洗浄液の浸漬時間で除することでE.R.を算出した。参考例3~6と比較して、参考例1~2では、バリウムを含有する無機物を洗浄液に添加することで、洗浄液によるアルミナへの腐食を抑制できていることがわかる。
2:ドライエッチング残渣
3:アルミナ系ハードマスク
4:ハードマスク(アルミナ系以外)
5:レジスト
6:低誘電率層間絶縁膜
Claims (8)
- アルカリ土類金属化合物を0.0001~20質量%含有するアルミナ保護液であって、前記アルカリ土類金属がベリリウム、マグネシウム、ストロンチウム及びバリウムからなる群より選択される1以上である、アルミナ保護液。
- 前記アルカリ土類金属化合物が、
硝酸ベリリウム、酢酸ベリリウム、塩化ベリリウム、水酸化ベリリウム、亜硫酸ベリリウム、塩素酸ベリリウム、過塩素酸ベリリウム、過酸化ベリリウム、クロム酸ベリリウム、酸化ベリリウム、シアン化ベリリウム、臭化ベリリウム、炭酸ベリリウム、メタホウ酸ベリリウム、ヨウ化ベリリウム、テトラフルオロホウ酸ベリリウム、硫酸ベリリウム、硫化ベリリウム、及び水酸化ベリリウムと酸を反応させた塩;
硝酸マグネシウム、酢酸マグネシウム、塩化マグネシウム、水酸化マグネシウム、亜硫酸マグネシウム、塩素酸マグネシウム、過塩素酸マグネシウム、過酸化マグネシウム、クロム酸マグネシウム、酸化マグネシウム、シアン化マグネシウム、臭化マグネシウム、炭酸マグネシウム、メタホウ酸マグネシウム、ヨウ化マグネシウム、テトラフルオロホウ酸マグネシウム、硫酸マグネシウム、硫化マグネシウム、及び水酸化マグネシウムと酸を反応させた塩;
硝酸ストロンチウム、酢酸ストロンチウム、塩化ストロンチウム、水酸化ストロンチウム、亜硫酸ストロンチウム、塩素酸ストロンチウム、過塩素酸ストロンチウム、過酸化ストロンチウム、クロム酸ストロンチウム、酸化ストロンチウム、シアン化ストロンチウム、臭化ストロンチウム、炭酸ストロンチウム、メタホウ酸ストロンチウム、ヨウ化ストロンチウム、テトラフルオロホウ酸ストロンチウム、硫酸ストロンチウム、硫化ストロンチウム、及び水酸化ストロンチウムと酸を反応させた塩;並びに
硝酸バリウム、酢酸バリウム、塩化バリウム、水酸化バリウム、亜硫酸バリウム、塩素酸バリウム、過塩素酸バリウム、過酸化バリウム、クロム酸バリウム、酸化バリウム、シアン化バリウム、臭化バリウム、炭酸バリウム、メタホウ酸バリウム、ヨウ化バリウム、テトラフルオロホウ酸バリウム、硫酸バリウム、硫化バリウム、及び水酸化バリウムと酸を反応させた塩
からなる群より選択される1以上である、請求項1に記載のアルミナ保護液。 - 前記アルカリ土類金属がバリウムである、請求項1又は2に記載のアルミナ保護液。
- 前記アルカリ土類金属化合物が硝酸バリウム、酢酸バリウム、塩化バリウム及び水酸化バリウムからなる群より選択される1以上である、請求項1~3のいずれか一項に記載のアルミナ保護液。
- 前記アルカリ土類金属化合物を1質量%超含有する、請求項1~4のいずれか一項に記載のアルミナ保護液。
- 過酸化水素の含有量が0.002質量%未満である、請求項1~5のいずれか一項に記載のアルミナ保護液。
- 請求項1~6のいずれか一項に記載のアルミナ保護液を用いてアルミナを含有するアルミナ層の表面の少なくとも一部を処理する工程を含む、アルミナの保護方法。
- 請求項7に記載のアルミナの保護方法を用いてアルミナ層に含有されるアルミナを保護する工程を含む、アルミナ層を有する半導体基板の製造方法。
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JP2020503539A JP7180667B2 (ja) | 2018-03-02 | 2019-02-27 | アルミナの保護液、保護方法及びこれを用いたアルミナ層を有する半導体基板の製造方法 |
CN201980012078.6A CN111699547A (zh) | 2018-03-02 | 2019-02-27 | 氧化铝的保护液、保护方法和使用了其的具有氧化铝层的半导体基板的制造方法 |
KR1020207019594A KR20200125582A (ko) | 2018-03-02 | 2019-02-27 | 알루미나의 보호액, 보호방법 및 이것을 이용한 알루미나층을 가지는 반도체 기판의 제조방법 |
EP19759900.4A EP3761346A4 (en) | 2018-03-02 | 2019-02-27 | ALUMINA PROTECTIVE LIQUID, ALUMINA PROTECTION PROCESS AND PROCESS FOR MANUFACTURING A SEMICONDUCTOR SUBSTRATE HAVING AN ALUMINA LAYER IMPLEMENTING THIS ALUMINA PROTECTION PROCESS |
EP21200791.8A EP3975223A1 (en) | 2018-03-02 | 2019-02-27 | Protective fluid for alumina |
IL277046A IL277046B2 (en) | 2018-03-02 | 2019-02-27 | A preparation for the protection of aluminum and its uses |
US16/976,565 US20210002551A1 (en) | 2018-03-02 | 2019-02-27 | Protective fluid for alumina, protection method, and production method for semiconductor substrate having alumina layer using same |
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EP (2) | EP3761346A4 (ja) |
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CN (1) | CN111699547A (ja) |
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KR102384110B1 (ko) | 2021-07-23 | 2022-04-08 | 주식회사 코닉스 | 반도체 및 디스플레이 에칭 공정용 저유전손실 소재 및 그 제조 장치 |
CN117712036B (zh) * | 2024-02-06 | 2024-04-16 | 中国科学院长春光学精密机械与物理研究所 | 一种硅通孔的形成方法 |
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KR20200125582A (ko) | 2020-11-04 |
US20210002551A1 (en) | 2021-01-07 |
TW201938480A (zh) | 2019-10-01 |
EP3975223A1 (en) | 2022-03-30 |
JP7180667B2 (ja) | 2022-11-30 |
EP3761346A1 (en) | 2021-01-06 |
JPWO2019167971A1 (ja) | 2021-03-04 |
CN111699547A (zh) | 2020-09-22 |
EP3761346A4 (en) | 2021-04-21 |
IL277046A (en) | 2020-10-29 |
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IL277046B1 (en) | 2024-05-01 |
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