TW201014927A - Etchant for titanium-based metal, tungsten-based metal, titanium-tungsten-based metal or nitrides thereof - Google Patents
Etchant for titanium-based metal, tungsten-based metal, titanium-tungsten-based metal or nitrides thereof Download PDFInfo
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- TW201014927A TW201014927A TW098128864A TW98128864A TW201014927A TW 201014927 A TW201014927 A TW 201014927A TW 098128864 A TW098128864 A TW 098128864A TW 98128864 A TW98128864 A TW 98128864A TW 201014927 A TW201014927 A TW 201014927A
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- Prior art keywords
- tungsten
- titanium
- based metal
- metal
- etching
- Prior art date
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 171
- 239000002184 metal Substances 0.000 title claims abstract description 171
- 239000010936 titanium Substances 0.000 title claims abstract description 97
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 82
- 229910052721 tungsten Inorganic materials 0.000 title claims abstract description 79
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 239000010937 tungsten Substances 0.000 title claims abstract description 69
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 title claims abstract description 67
- MAKDTFFYCIMFQP-UHFFFAOYSA-N titanium tungsten Chemical compound [Ti].[W] MAKDTFFYCIMFQP-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 150000004767 nitrides Chemical class 0.000 title claims abstract description 36
- 238000005530 etching Methods 0.000 claims abstract description 131
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 49
- -1 organic acid salt Chemical class 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 51
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 16
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 15
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 12
- 229910021529 ammonia Inorganic materials 0.000 claims description 12
- 229910052770 Uranium Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 9
- 239000000956 alloy Substances 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 8
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 6
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 6
- USFZMSVCRYTOJT-UHFFFAOYSA-N Ammonium acetate Chemical compound N.CC(O)=O USFZMSVCRYTOJT-UHFFFAOYSA-N 0.000 claims description 5
- 239000005695 Ammonium acetate Substances 0.000 claims description 5
- 235000019257 ammonium acetate Nutrition 0.000 claims description 5
- 229940043376 ammonium acetate Drugs 0.000 claims description 5
- VZTDIZULWFCMLS-UHFFFAOYSA-N ammonium formate Chemical compound [NH4+].[O-]C=O VZTDIZULWFCMLS-UHFFFAOYSA-N 0.000 claims description 5
- VBIXEXWLHSRNKB-UHFFFAOYSA-N ammonium oxalate Chemical compound [NH4+].[NH4+].[O-]C(=O)C([O-])=O VBIXEXWLHSRNKB-UHFFFAOYSA-N 0.000 claims description 5
- 150000003863 ammonium salts Chemical class 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 229910000484 niobium oxide Inorganic materials 0.000 claims description 5
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 229910052715 tantalum Inorganic materials 0.000 claims description 5
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 5
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 claims description 5
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 4
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 4
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 4
- 235000011054 acetic acid Nutrition 0.000 claims description 4
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 claims description 4
- KLOIYEQEVSIOOO-UHFFFAOYSA-N carbocromen Chemical compound CC1=C(CCN(CC)CC)C(=O)OC2=CC(OCC(=O)OCC)=CC=C21 KLOIYEQEVSIOOO-UHFFFAOYSA-N 0.000 claims description 4
- 235000019253 formic acid Nutrition 0.000 claims description 4
- 235000006408 oxalic acid Nutrition 0.000 claims description 4
- 239000011975 tartaric acid Substances 0.000 claims description 4
- 235000002906 tartaric acid Nutrition 0.000 claims description 4
- 239000005711 Benzoic acid Substances 0.000 claims description 2
- 235000005979 Citrus limon Nutrition 0.000 claims description 2
- 235000010233 benzoic acid Nutrition 0.000 claims description 2
- 239000001384 succinic acid Substances 0.000 claims description 2
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 claims 2
- 244000248349 Citrus limon Species 0.000 claims 1
- XGZGDYQRJKMWNM-UHFFFAOYSA-N tantalum tungsten Chemical compound [Ta][W][Ta] XGZGDYQRJKMWNM-UHFFFAOYSA-N 0.000 claims 1
- 150000002739 metals Chemical class 0.000 abstract description 34
- 239000000758 substrate Substances 0.000 abstract description 18
- 238000005187 foaming Methods 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 8
- 239000010408 film Substances 0.000 description 26
- 239000000243 solution Substances 0.000 description 22
- 239000000203 mixture Substances 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 18
- 239000004065 semiconductor Substances 0.000 description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 11
- 229910001080 W alloy Inorganic materials 0.000 description 8
- YWYZEGXAUVWDED-UHFFFAOYSA-N triammonium citrate Chemical compound [NH4+].[NH4+].[NH4+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O YWYZEGXAUVWDED-UHFFFAOYSA-N 0.000 description 8
- 239000001393 triammonium citrate Substances 0.000 description 8
- 235000011046 triammonium citrate Nutrition 0.000 description 8
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 7
- 239000004973 liquid crystal related substance Substances 0.000 description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 5
- 150000007524 organic acids Chemical class 0.000 description 5
- 238000004544 sputter deposition Methods 0.000 description 5
- 229910021642 ultra pure water Inorganic materials 0.000 description 5
- 239000012498 ultrapure water Substances 0.000 description 5
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 4
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 235000015165 citric acid Nutrition 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 229920002120 photoresistant polymer Polymers 0.000 description 3
- 229910052707 ruthenium Inorganic materials 0.000 description 3
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- KWIPUXXIFQQMKN-UHFFFAOYSA-N 2-azaniumyl-3-(4-cyanophenyl)propanoate Chemical compound OC(=O)C(N)CC1=CC=C(C#N)C=C1 KWIPUXXIFQQMKN-UHFFFAOYSA-N 0.000 description 2
- WXUAQHNMJWJLTG-UHFFFAOYSA-N 2-methylbutanedioic acid Chemical compound OC(=O)C(C)CC(O)=O WXUAQHNMJWJLTG-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 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 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 229940090948 ammonium benzoate Drugs 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- NHJPVZLSLOHJDM-UHFFFAOYSA-N azane;butanedioic acid Chemical compound [NH4+].[NH4+].[O-]C(=O)CCC([O-])=O NHJPVZLSLOHJDM-UHFFFAOYSA-N 0.000 description 2
- NGPGDYLVALNKEG-UHFFFAOYSA-N azanium;azane;2,3,4-trihydroxy-4-oxobutanoate Chemical compound [NH4+].[NH4+].[O-]C(=O)C(O)C(O)C([O-])=O NGPGDYLVALNKEG-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- QOSATHPSBFQAML-UHFFFAOYSA-N hydrogen peroxide;hydrate Chemical compound O.OO QOSATHPSBFQAML-UHFFFAOYSA-N 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 229910001925 ruthenium oxide Inorganic materials 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- ARCGXLSVLAOJQL-UHFFFAOYSA-N trimellitic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C(C(O)=O)=C1 ARCGXLSVLAOJQL-UHFFFAOYSA-N 0.000 description 2
- 238000001039 wet etching Methods 0.000 description 2
- GXEKYRXVRROBEV-FBXFSONDSA-N (1r,2s,3r,4s)-7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylic acid Chemical compound C1C[C@@H]2[C@@H](C(O)=O)[C@@H](C(=O)O)[C@H]1O2 GXEKYRXVRROBEV-FBXFSONDSA-N 0.000 description 1
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- USZAQQBEAQJLMT-UHFFFAOYSA-N 2-hydroxy-2-methylbutanedioic acid;2-hydroxypropane-1,2,3-tricarboxylic acid Chemical compound OC(=O)C(O)(C)CC(O)=O.OC(=O)CC(O)(C(O)=O)CC(O)=O USZAQQBEAQJLMT-UHFFFAOYSA-N 0.000 description 1
- KPGXRSRHYNQIFN-UHFFFAOYSA-N 2-oxoglutaric acid Chemical compound OC(=O)CCC(=O)C(O)=O KPGXRSRHYNQIFN-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 244000131522 Citrus pyriformis Species 0.000 description 1
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 description 1
- WHUUTDBJXJRKMK-UHFFFAOYSA-N Glutamic acid Natural products OC(=O)C(N)CCC(O)=O WHUUTDBJXJRKMK-UHFFFAOYSA-N 0.000 description 1
- WHUUTDBJXJRKMK-VKHMYHEASA-N L-glutamic acid Chemical compound OC(=O)[C@@H](N)CCC(O)=O WHUUTDBJXJRKMK-VKHMYHEASA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 238000004380 ashing Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000003287 bathing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- HNEGQIOMVPPMNR-IHWYPQMZSA-N citraconic acid Chemical compound OC(=O)C(/C)=C\C(O)=O HNEGQIOMVPPMNR-IHWYPQMZSA-N 0.000 description 1
- 229940018557 citraconic acid Drugs 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- HTXDPTMKBJXEOW-UHFFFAOYSA-N dioxoiridium Chemical compound O=[Ir]=O HTXDPTMKBJXEOW-UHFFFAOYSA-N 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- IAOQICOCWPKKMH-UHFFFAOYSA-N dithieno[3,2-a:3',2'-d]thiophene Chemical group C1=CSC2=C1C(C=CS1)=C1S2 IAOQICOCWPKKMH-UHFFFAOYSA-N 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- MWRJCEDXZKNABM-UHFFFAOYSA-N germanium tungsten Chemical compound [Ge].[W] MWRJCEDXZKNABM-UHFFFAOYSA-N 0.000 description 1
- 235000013922 glutamic acid Nutrition 0.000 description 1
- 239000004220 glutamic acid Substances 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910000457 iridium oxide Inorganic materials 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 239000001630 malic acid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- HNEGQIOMVPPMNR-NSCUHMNNSA-N mesaconic acid Chemical compound OC(=O)C(/C)=C/C(O)=O HNEGQIOMVPPMNR-NSCUHMNNSA-N 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
- HNEGQIOMVPPMNR-UHFFFAOYSA-N methylfumaric acid Natural products OC(=O)C(C)=CC(O)=O HNEGQIOMVPPMNR-UHFFFAOYSA-N 0.000 description 1
- MGRWKWACZDFZJT-UHFFFAOYSA-N molybdenum tungsten Chemical compound [Mo].[W] MGRWKWACZDFZJT-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005502 peroxidation Methods 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000001508 potassium citrate Substances 0.000 description 1
- QEEAPRPFLLJWCF-UHFFFAOYSA-K potassium citrate (anhydrous) Chemical compound [K+].[K+].[K+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O QEEAPRPFLLJWCF-UHFFFAOYSA-K 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- WXMKPNITSTVMEF-UHFFFAOYSA-M sodium benzoate Chemical compound [Na+].[O-]C(=O)C1=CC=CC=C1 WXMKPNITSTVMEF-UHFFFAOYSA-M 0.000 description 1
- 239000004299 sodium benzoate Substances 0.000 description 1
- 235000010234 sodium benzoate Nutrition 0.000 description 1
- 239000001509 sodium citrate Substances 0.000 description 1
- ZNCPFRVNHGOPAG-UHFFFAOYSA-L sodium oxalate Chemical compound [Na+].[Na+].[O-]C(=O)C([O-])=O ZNCPFRVNHGOPAG-UHFFFAOYSA-L 0.000 description 1
- 229940039790 sodium oxalate Drugs 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 235000011044 succinic acid Nutrition 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 235000015870 tripotassium citrate Nutrition 0.000 description 1
- HRXKRNGNAMMEHJ-UHFFFAOYSA-K trisodium citrate Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O HRXKRNGNAMMEHJ-UHFFFAOYSA-K 0.000 description 1
- 229940038773 trisodium citrate Drugs 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/32—Alkaline compositions
- C23F1/38—Alkaline compositions for etching refractory metals
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/26—Acidic compositions for etching refractory metals
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/32—Alkaline compositions
- C23F1/40—Alkaline compositions for etching other metallic material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/44—Compositions for etching metallic material from a metallic material substrate of different composition
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/20—Other heavy metals
- C23G1/205—Other heavy metals refractory metals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/3213—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
- H01L21/32133—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only
- H01L21/32134—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only by liquid etching only
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Description
201014927 六、發明說明: 【發明所屬之技術領域】 本發明有關鈦系金屬、鎢系金屬、鈦鎢系*金屬或該等 之氮化物的鈾刻液。本發明尤其有關相對於鈦系金屬、鎢 系金屬、鈦鎢系金屬以外之金屬之鈦系金屬、鎢系金屬、 鈦鶴系金屬或該等之氮化物之選擇触刻性優異之餓刻液。 _ 【先前技術】 屬於鈦系金屬的金屬鈦(Ti )、氮化鈦(TiN )或鈦 合金已被使用作爲半導體裝置、液晶顯示器、MEMS (微 電子機械系統)裝置、印刷電路基板等之貴金屬或鋁(A1 )、銅(Cu)電路之底層、覆蓋層。又,亦被使用於半導 體裝置中作爲阻障金屬、閘極金屬。 一般的鈦系金屬的蝕刻,已知有利用氫氟酸/硝酸混 合液、過氧化氫/氫氟酸混合液進行處理之方法,但由於 φ 該等含有氫氟酸故有亦會侵蝕矽基板或玻璃基板之缺點。 又’亦有將裝置中存在的A1電路等耐腐蝕性較弱金屬也 同時蝕刻掉的問題。 爲了改善該等液體的缺點,已揭示有過氧化氫/氨 /EDTA (乙二胺四乙酸)混合液以及過氧化氫/磷酸鹽混合 液(專利文獻1、2 )。然而,該等對鈦系金屬的蝕刻速率 小且過氧化氫的分解迅速而無法安定地蝕刻,故作爲改良 該等液體者,已提案有由過氧化氫/磷酸/氨混合液所構成 之蝕刻液(專利文獻3 )。然而,此蝕刻液雖改善了蝕刻 -5- 201014927 速率但蝕刻液卻會激烈發泡,故會在基板表面上附著氣泡 ,而有附著氣泡之部分無法進行触刻之缺點。又,亦有因 過氧化氫發泡、分解導致蝕刻速率的降低變大的問題。該 混合物雖已以氨調整至指定的pH後使用,但以pH的少 許差異改變蝕刻速率及發泡狀態,亦有蝕刻條件的安定性 方面的問題。 另一方面,作爲含有過氧化氫之洗淨液已揭示有於過 g 氧化氫/氨/水中包含有機酸銨鹽之半導體洗淨液(專利文 獻4)。然而,該半導體洗淨液爲使於半導體製造步驟中 去除基板上所附著之微粒子等之污染物之洗淨液,雖記載 有使摻雜氧化膜與非摻雜氧化膜之蝕刻速率較小,但有關 鈦系金屬之蝕刻全然未記載。又,專利文獻5中,揭示含 有過氧化氫/羧酸鹽/水之光阻劑殘渣剝離用組成物。此組 成物目的係用以剝離光阻劑灰化後之光阻劑殘渣,非以鈦 系金屬之蝕刻作爲對象。 φ 又’鎢或鎢合金已使用於液晶顯示器、半導體裝置之 薄膜電晶體之閘極、電路、障壁層或接觸孔、貫通孔( via hole)之埋入。且於MEMS (微機電系統)領域中, 亦已利用作爲鎢加熱器。 鎢或鎢合金大多藉CVD或濺鍍法予以成膜。但以該 等方法成膜之際,亦會附著於半導體裝置在其實際的元件 形成部以外之基板(晶圓)背面、基板(晶圓)邊緣、成 膜裝置外壁'排氣管內等’而有其等剝離且於元件形成部 發生異物之問題。作爲其對策之一,有利用蝕刻液去除不 -6 - 201014927 需要的膜。此異物對策以外,亦期望於半 顯示裝置、MEMS裝置之製造步驟中,以 更優異的濕蝕刻對鎢或鎢合金進行加工。 半導體裝置程度的加工精度之液晶顯示器 適用濕蝕刻法。 作爲鎢系金屬的蝕刻液、去除液,廣 酸與硝酸之混合液(非專利文獻1等), _ 溶解矽基板或二氧化矽膜、玻璃基板而不 時蝕刻裝置中所存在之A1電路等耐蝕性 。另一方面,以過氧化氫水爲主成分之蝕 專利文獻6〜9等,於專利文獻9中已詳述 氫爲主的蝕刻液的問題點。據此記載有蝕 隨著鎢溶解pH產生變動的結果,蝕刻速 擇性惡化。再者,亦記載有若鎢被溶解則 速度將大幅增大。作爲解決該等問題者雖 φ 氫中添加唑(專利文獻8 ),但過氧化氫 足,鈾刻速率並不穩定。如上述,以過氧 成分的蝕刻液,於現狀中實用上尙未具鎢 、鎢的蝕刻選擇性大、液體壽命長者。 專利文獻
專利文獻1:特開平08-013166號公_ 專利文獻2:特開2000-311891號公H 專利文獻3:特開2005-146358號公H 專利文獻4:特開平10-284452號公H 導體裝置、液晶 比乾蝕刻生產性 尤其於不要求如 、MEMS裝置則 泛已知有氟化氫 但該等由於亦會 佳。又,亦有同 弱之金屬的問題 刻液已見於例如 歸納以往過氧化 刻速度變慢、伴 率變動使蝕刻選 過氧化氫的分解 已公開於過氧化 之分解抑制尙不 化氫水作爲主要 的蝕刻速率安定 201014927 專利文獻5 :特開2005- 1 83 52 5號公報 專利文獻6 :特開昭62_ 1 43422號公報 專利文獻7 :特開平8-250462號公報 專利文獻8 :特開2002-53 984號公報 專利文獻9 :特開2004-3 1 79 1號公報 非專利文獻 非專利文獻1:監修坂本正典、發行者島健太郎「半 p 導體製造製程材料及化學品」,2006年9月30日發行第 —版,第144頁。 【發明內容】 [發明欲解決的課題] 本發明係消除如上述之問題點者,而提供可藉由減少 蝕刻時之蝕刻液發泡而減低蝕刻對象物之不均一蝕刻,且 蝕刻速率安定之鈦系金屬、鎢系金屬、鈦鎢系金屬或該等 φ 之氮化物的蝕刻液。再者,可提供不腐鈾基板而對於鈦系 金屬、鎢系金屬、鈦鎢系金屬或該等之氮化物之蝕刻選擇 性優於鈦系金屬、鎢系金屬、鈦鎢系金屬以外的金屬之蝕 刻液。 [用以解決課題之手段] 本發明人等爲解決上述課題而重複積極硏究之結果, 發現若使用含有過氧化氫及有機酸鹽之水溶液,則可減少 蝕刻液之發泡且可以減低蝕刻對象物之不均一蝕刻且飩刻 -8 - 201014927 速率安定。且發現若使用本發明之鈾刻液,並不會鈾刻鎳 、銅、鋁等之其他金屬或基板材料(玻璃、矽、氧化矽、 氮化矽),而可選擇性地蝕刻鈦系金屬、鎢系金屬、鈦鎢 系金屬或該等之氮化物,因而完成本發明。 亦即,本發明包含下列所述者。 π] —種鈦系金屬、鎢系金屬、鈦鎢系金屬或該等之 氮化物的蝕刻液,其特徵爲包含10〜40質量%之過氧化氫 g 、0.1〜15質量%之有機酸鹽及水。 [2] —種鈦系金屬、鎢系金屬、鈦鎢系金屬或該等之 氮化物的蝕刻液,其特徵爲僅由10〜40質量%之過氧化氫 、0.1〜15質量%之有機酸鹽及水所構成。 [3] 如[1]所述之鈦系金屬、鎢系金屬、鈦鎢系金屬或 該等之氮化物的蝕刻液,其進而包含0.005~4.5質量%之 氨。 [4] 如[1]至[3]中任一項所述之鈦系金屬、鎢系金屬 φ 、鈦鎢系金屬或該等之氮化物的蝕刻液,其中上述有機酸 鹽爲選自檸檬酸、甲酸、草酸、乙酸、酒石酸、苯甲酸及 琥珀酸之銨鹽之至少一種。 [5] 如[4]所述之鈦系金屬、鎢系金屬、鈦鎢系金屬或 該等之氮化物的蝕刻液,其中上述有機酸之銨鹽爲選自檸 檬酸氫二銨、檸檬酸三銨、草酸銨、甲酸銨、乙酸銨之至 少一種。 [6] 如[1]至[5]中任一項所述之鈦系金屬、鎢系金屬 、鈦鎢系金屬或該等之氮化物的蝕刻液,其中鈦系金屬或 -9 - 201014927 其氮化物相對於 A1、Ni、Cu、Cr、Ru、Ta、Si 元素作爲主成分之合金之蝕刻速率比爲20以上 [7] 如[1]至[5]中任一項所述之鈦系金屬、 、鈦鎢系金屬或該等之氮化物的蝕刻液,其中叙 其氮化物相對於玻璃、矽、氧化矽或氮化矽之創 爲2 0以上。 [8] —種電子裝置之製造方法,該方法具有 [7]中任一項所述之蝕刻液蝕刻鈦系金屬、鎢系金 系金屬或該等之氮化物之步驟。 [發明效果] 本發明之蝕刻液,由於對鈦系金屬、鎢系金 系金屬或該等之氮化物之選擇蝕刻性比對鈦系金 金屬、欽鎢系金屬以外之金屬或基板材料(玻璃 化砂)之蝕刻選擇性優異,且發泡較少,故使用 • 0 鈾刻液可對鈦系金屬、鎢系金屬、鈦鎢系金屬或 化物進行均一地鈾刻。 【實施方式】 以下詳細說明本發明。 本發明之欽系金屬、鶴系金屬、欽鶴系金屬 氮化物的蝕刻液係由含有過氧化氫及有機酸鹽類 所構成。 過氧化氫在蝕刻液中含有1 0〜40質量% 或以該等 鎢系金屬 系金屬或 刻速率比 藉由[1]至 屬、鈦鎢 屬、駄鶴 屬、鶴系 、砂、氧 本發明之 該等之氮 或該等之 之水溶液 ,更好爲 -10 - 201014927 15〜35質量%,又更好爲20~35質量%。過氧化氫之濃度低 於10質量%時,鈦或鎢、鈦鎢合金之蝕刻速率變低而不實 用。另一方面,當過氧化氫之濃度高於40質量%時’過氧 化氫之分解變多而不實用。 本發明中可用的有機酸鹽並無特別限制,但在不需要 金屬雜質之半導體等電子裝置之製造步驟中使用有機酸鹽 時’更好使用銨鹽。 有機酸鹽在蝕刻液中含有0.1〜15質量%,更好爲含有 1〜10質量%,又更好爲含有3~8質量%。有機酸鹽之濃度 低於0.1質量%時,蝕刻速率變低,而不實用。另外,即 使該濃度高過1 5質量%時,蝕刻速率亦無法大幅提升。 至於有機酸鹽並無特別限制,可舉例爲檸檬酸、甲酸 、草酸、乙酸、酒石酸、琥珀酸、蘋果酸、馬來酸、丙二 酸、戊二酸、己二酸、D-聚葡萄糖酸、衣康酸、檸康酸、 中康酸、2-氧代戊二酸、偏苯三酸、菌多酸(endothal ) 、谷胺酸、甲基琥珀酸、檸蘋酸(Citramalic acid )等之 鹽。本發明者針對鈦系金屬、鎢系金屬或該等之氮化物評 價蝕刻特性之結果,發現蝕刻液係中性比酸性可獲得高的 蝕刻速率之傾向。因而使用有機酸鹽。較好爲使用檸檬酸 、甲酸、草酸、乙酸、酒石酸、琥珀酸之鹽,更好爲使用 檸檬酸氫二銨、檸檬酸三銨、草酸銨、甲酸銨、乙酸銨。 該等可單獨使用.,亦可組合兩種以上使用。另外,有機酸 銨鹽可作爲有機酸敍鹽本身使用,亦可在蝕刻液中使有機 酸與氨反應使用,並沒有任何限制。 -11 - 201014927 爲提高鈦系金屬、鎢系金屬、鈦鎢系金屬或此等之氮 化物的蝕刻速率可依據需要添加氨。添加氨時,蝕刻液中 之濃度爲0·005~4.5質量%’更好爲0.05〜2質量%,又更 好爲0.1 ~0.5質量%之範圍。氨之濃度高於4.5質量%時, 可提昇鈦系金屬、鎢系金屬或此等之氮化物的蝕刻速率, 但裝置中存在之Α1等容易被鹼腐蝕的金屬被蝕刻而不佳 〇 _ 由於上述組成之本發明蝕刻液對鈦系金屬、鎢系金屬 9 、鈦鎢系金屬或此等之氮化物蝕刻時發泡少,因此可進行 均勻蝕刻。另外,本發明之蝕刻液對鈦系金屬、鎢系金屬 、鈦鎢系金屬以外之金屬或基板材料(玻璃、矽、氧化矽 、氮化矽)之蝕刻速率小,相對於此鈦系金屬、鎢系金屬 、鈦鎢系金屬或此等之氮化物之選擇蝕刻性(鈦系金屬、 鎢系金屬或此等之氮化物之蝕刻速率相對於鈦系金屬、鎢 系金屬以外之金屬或基板材料(玻璃、矽、氧化矽、氮化 ❹ 矽)之蝕刻速率之比)爲20以上爲佳。又,本發明之蝕 刻液在不影響蝕刻特性之範圍內亦可添加上述以外之各種 成分,例如潤濕劑、界面活性劑、著色劑、抗發泡劑、有 機溶劑等。 本說明書中所謂的鈦系金屬,除金屬鈦(Ti )以外, 意指含有鈦作爲主成分(70質量%以上)之合金。又,所 謂鈦系金屬之氮化物意指金屬鈦或鈦合金之氮化物,典型 之例舉例爲氮化鈦。鈦合金之具體例舉例爲矽化鈦(Ti Si )。同樣的所謂鎢系金屬,除金屬鎢(W )以外,意指含 -12- 201014927 有鎢作爲主成分(70質量%以上)之合金。又,所謂鎢系 金屬之氮化物意指金屬鎢或鎢合金之氮化物。典型之例舉 例爲氮化鎢。鎢合金之具體例舉例爲鎢化鉬(MoW )、矽 化鎢(WSi )等。 又,本說明書中,所謂鈦鎢系金屬意指包含鈦與鎢二 者,且二者之合計爲70質量%以上之合金。另外,鈦鎢系 金屬之氮化物意指該等鈦鎢系合金之氮化物。 _ 對該等鈦系金屬、鎢系金屬、鈦鎢系金屬於基板上之 p 成膜方法並無特別限制,可使用CVD、濺鍍、蒸鍍法之任 —種方法,又成膜條件亦無限制。且,本說明書中所謂的 鈦系金屬、鎢系金屬、鈦鎢系金屬以外之金屬係指Al、Ni 、Cu、Cr ' Ru、Ta、Si或以該等元素之任一種作爲主成 分(70質量%以上)(包含複數元素時其合計量爲70質 量%以上)之合金,亦包含具有其他元素者。 使用上述鈦系金屬、鎢系金屬、鈦鎢系金屬或該等之 φ 氮化物之裝置並無特別限制,可使用於全部電子裝置中。 該等電子裝置舉例爲液晶顯示器、半導體裝置、MENS裝 置、印刷電路基板、有機EL顯示器、場發射顯示器、電 子紙、電漿顯示器等。本發明所謂的蝕刻意指利用蝕刻顯 像之全部者’且當然包含將鈦系金屬、鎢系金屬、鈦鎢系 金屬圖型化者’亦包含洗淨去除鈦系金屬或鎢系金屬、鈦 鎢系金屬之殘留物等之用途。亦包含於最終製品中雖未殘 留鈦或鎢、鈦鎢合金’但在製造製程過程中使用鈦系金屬 或鎢系金屬、鈦鎢系金屬’使鈦系金屬或鎢系金屬、鈦鎢 -13- 201014927 系金屬全部溶解於蝕刻液中而去除者。 以本發明之鈦系金屬、鎢系金屬、鈦鎢系 之氮化物的蝕刻液處理,通常係藉由浸漬法進 方法亦可以例如噴佈法、旋轉蝕刻法等處理。 理之條件係依據過氧化氫濃度、有機酸銨鹽之 、鈦系金屬、鎢系金屬、鈦鎢系金屬或此等之 厚等而不同,無法槪略規定,但一般的處理溫 °C,更好爲30〜60°C。該等處理可邊施加超音丨 實施例 以下列舉實施例及比較例具體說明本發明 並不受下列敘述限制。
Ti、W及A1之蝕刻速率之測定 以濺鍍設備將Ti、W及A1分別成膜(膜丨 φ )於LCD (液晶顯示器)用無鹼玻璃基板上之 及A1膜之樣品基板,切成約0.5cm見方,獲 於100毫升燒杯中注入20毫升下表1所示;: 比較例之組成之蝕刻液,且加熱至5 0 °C。將 、W、A1膜之樣品片各一片同時投入該蝕刻液 視觀察各濺鍍膜全部消失之時間。由進行同樣 結果分別計算出Ti、W及A1之蝕刻速率之平 中彙整顯示各實施例、比較例之蝕刻速率。表 各蝕刻液之構成成份以外爲水(超純水)。又 金屬或該等 行,但其他 以浸漬法處 種類或含量 氮化物之膜 度爲20〜80 艺邊進行。 ,但本發明 學各爲50nm 貼附Ti 、 W 得樣品片》 各實施例及 上述貼附Ti 中,且以目 測定3次之 [均値。表1 1中所示之 ,各實施例 -14- 201014927 及比較例之蝕刻液係KISHID A化學製特級品之3 5質量% 之過氧化氫水,關東化學製造之EL級之28質量%之氨水 ,使用市售有機酸銨依據需要以超純水調製成各組成。
Ti、W及A1以外之金屬蝕刻速率之測定 除以 Ni、Cu、Cr、Ru、Ta、Si 替代 Ti、W 及 A1 成 爲濺鍍膜之材質以外,餘與上述Ti、W、A1之蝕刻速率之 i 測定相同,使用貼附Ni、Cu、Cr、Ru、Ta、Si膜之樣品 片進行測定,計算出蝕刻速率。下表2中顯示使用實施例 1、2、3之組成之蝕刻液測定之結果。
Ti蝕刻速率變化之測定 於100毫升之燒杯中注入20毫升表1之實施例1之 組成之蝕刻液,且加熱至50°C。將一片貼附Ti膜之樣品 片投入維持於50°C之蝕刻液中。以該樣品片投入時作爲起 _ 始點(0時),隨後一邊維持在50°C之溫度一邊每一小時 投入一片貼附Ti膜之樣品片,且測定至6小時後之鈾刻 速率。另外,蝕刻速率之測定方法與前述之方法相同。比 較例使用過氧化氫30質量%、磷酸0.3質量%,氨0.02質 量%,超純水69.68質量%之蝕刻液(比較例3 ),進行同 樣之試驗。其結果不於圖1中。 蝕刻液之發泡狀態之觀察 準備表1之實施例1組成之鈾刻液,維持在恆溫50°c -15- 201014927 下。將切成〇.5cm見方之貼附Ti膜(厚度50nm)之樣品 片浸漬於該蝕刻液中一分鐘。以照相攝影自此時液體之發 泡狀態。又,至於比較例,使用過氧化氫30質量%、磷酸 0.3質量%,氨〇.〇2質量%,超純水69.68質量%之蝕刻液 (比較例3),同樣的評估發泡狀態。結果示於圖2、3中
TiW蝕刻速率變化之測定 於50毫升之燒杯中注入20毫升表1之實施例12之 組成之蝕刻液,且加熱至45 °C。將一片貼附TiW膜之矽 晶圓片(約〇.5cm見方,W膜厚200nm )投入維持於45°C 之蝕刻液中。以該樣品片投入時作爲起始點(0時),隨 後一邊維持在45 °C之溫度下一邊每6小時投入一片貼附 TiW膜之樣品片,且測定至66小時後之蝕刻速率。又, 蝕刻速率之測定方法與前述之方法相同。作爲比較例,使 用過氧化氣3 0質量%、超純水7 0質量%之蝕刻液(比較 例2),進行同樣之試驗。其結果示於圖4。又,TiW之 組成係使用包含10質量%之Ti、90質量%之W者。 -16- 201014927 表1
H2〇2 (Mm%) nh3 (質量%) 有機酸/有榜 !酸鹽 蝕刻速率(nm/min) 選擇性 mm 濃度 質量% Ti W A1 Ti/Al W/Al 實 施 例 1 30 0.1 檸檬酸三銨 5.0 100 375 <1.0 >100 >375 2 30 0.1 甲酸銨 5.0 91 250 1.4 65 179 3 30 0.1 草酸銨 5.0 83 333 1.1 75 302 4 30 0.01 乙酸銨 5.0 60 600 <1.0 >60 >600 5 30 0.1 酒石酸銨 5.0 64 250 <1.0 >64 >250 6 30 0.1 苯甲酸銨 5.0 55 300 <1.0 >55 >300 7 30 0.1 琥珀酸銨 5.0 75 333 <1.0 >75 >333 8 20 0.1 檸檬酸三銨 5.0 75 300 <1.0 >75 >300 9 20 0.5 檸檬酸三銨 3.0 86 800 3.8 23 211 10 30 2.0 檸檬酸氫二銨 5.0 250 800 4.0 63 200 11 30 0.1 檸檬酸三銨 15 75 375 <1.0 >75 >375 12 30 0.0 檸檬酸三銨 5.0 55 300 <1.0 >55 >300 13 30 0.0 甲酸銨 5.0 60 215 <1.0 >60 >215 14 30 0.0 草酸銨 5.0 33 231 <1.0 >33 >231 15 30 0.0 乙酸銨 5.0 60 300 <1.0 >60 >300 16 30 0.0 酒石酸銨 5.0 25 200 <1.0 >25 >200 17 30 0.0 苯甲酸銨 5.0 33 200 <1.0 >33 >200 18 30 0.0 琥珀酸銨 5.0 55 300 <1.0 >55 >300 19 30 0.0 檸檬酸三鉀 5.0 50 300 <1.0 >50 >300 20 30 0.0 檸檬酸三鈉 5.0 50 300 <1.0 >50 >300 21 30 0.0 草酸鈉 5.0 23 200 <1.0 >23 >200 22 30 0.0 乙酸鈉 5.0 50 300 <1.0 >50 >300 23 30 0.0 苯甲_ 5.0 24 200 <1.0 >24 >200 24 30 0.0 苯甲酸鈉 5.0 25 200 <1.0 >25 >200 25 30 0.1 檸檬酸三銨 0.5 67 210 <1.0 >67 >65 26 15 0.2 檸檬酸三銨 5.0 51 180 <1.0 >51 >180 比較 例 1 5 0.1 檸檬酸三銨 5.0 15 40 <1.0 >15 >40 2 30 0.0 - 0.0 11 150 <1.0 >11 >150 -17- 201014927 表2
Cu Ni Ru Ta Cr Si Si02 Si3N4 實施例1 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 實施例2 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 實施例3 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 表1中所示之全部實施例1~26組成之鈾刻液,Ti、W 之蝕刻速率相對於A1之蝕刻速率之比爲20以上,Ti、W 之選擇蝕刻性優異。蝕刻速率於一部份組成Ti之蝕刻速 度有些小但大致上也大於50nm/miii而爲良好。另一方面 ,评之蝕刻速度均爲150nm/miii以上而爲良好。相對於此 ,比較例 1之蝕刻液於 Ti、W之蝕刻速率均小如 50nm/min以下而不充分。比較例2中Ti之触刻速率小如 50nm/min以下而不充分。 又,由表2可了解本發明之蝕刻液,與A1相同,對 Ni > Cu ' Cr > Ru ' Ta > Si、Si02、Si3N4 之蝕刻速率亦小 ,相對於此等,對鈦、鎢具有良好的選擇蝕刻性。再者, 由圖1可了解本發明之蝕刻液對鈦之蝕刻速率之經時下降 率小,爲安定性優異。相對於此,比較例3之蝕刻液其初 期之Ti鈾刻速率(150nm/min)雖然高於實施例1之蝕刻 液,但蝕刻速率經時變化(下降)大,安定性差。 再者,針對WN、TiW、TiN以實施例1之組成同樣測 定倉虫刻速率,分別爲 320nm/min、200nm/min、120nm/min 。至於此處之TiW之組成係使用Ti、W分別爲1 0質量% 、90質量%者。WN、TiN使用如化學式之組成者。 -18- 201014927 圖2、3顯示將貼附Ti膜之樣品片投入蝕刻液中該時 之蝕刻液發泡狀態。相片爲自上方觀察燒杯之照片。於圖 3 (比較例3之蝕刻液)發現蝕刻液有相當的發泡,相對 地,於圖2(實施例1之蝕刻液)中幾乎未觀察到發泡。 據此可知由於本發明之蝕刻液在蝕刻時之氣泡產生少,因 此對鈦系金屬之均勻蝕刻有利。 由圖4可了解本發明之蝕刻液之TiW蝕刻速率經時下 _ 降率小,安定性優異。相對於此,比較例2之蝕刻液之 TiW蝕刻速率(50nm/min)之經時變化(下降)大,安定 性差。 [產業上之可能利用性] 藉由使用本發明之蝕刻液可均勻的蝕刻鈦、鎳及其合 金或者其氮化物。又,本發明之蝕刻液由於對銅、鎳、鋁 等其他金屬或玻璃、矽、氧化矽膜之蝕刻速率小,因此不 〇 會損及基板、甚至氧化矽膜,因此可用於半導體裝置、液 晶顯示器等電子裝置之製造。 【圖式簡單說明】 圖1爲表示實施例1及比較例3之組成的蝕刻液對鈦 之蝕刻速率經時變化之圖。 圖2爲表示附有Ti膜之樣品片浸漬於實施例1之蝕 刻液時之發泡狀態。 圖3爲表示附有Ti膜之樣品片浸漬於比較例3之蝕 -19- 201014927 刻液時之發泡狀態。 圖4爲顯示以實施例1 2及比較例2之組成的蝕刻液 對鈦鎢(TiW )之蝕刻速率經時變化之圖。
-20 -
Claims (1)
- 201014927 七、申請專利範園: 1·—種鈦系金屬、鎢系金屬、鈦鎢系金屬或該等之 氮化物的蝕刻液,其特徵爲包含10~40質量%之過氧化氫 、〇·1〜15質量%之有機酸鹽及水。 2.—種鈦系金屬、鎢系金屬、鈦鎢系金屬或該等之 氮化物的蝕刻液,其特徵爲僅由10〜40質量%之過氧化氫 、0.1-15質量%之有機酸鹽及水所構成。 | 3.如申請專利範圍第1項之鈦系金屬、鎢系金屬、 鈦鎢系金屬或該等之氮化物的蝕刻液,其進而包含 0·005〜4.5質量%之氨。 4. 如申請專利範圍第1至3項中任一項之鈦系金屬 '鎢系金屬、鈦鎢系金屬或該等之氮化物的蝕刻液,其中 上述有機酸鹽爲選自檸檬酸、甲酸、草酸、乙酸、酒石酸 、苯甲酸及琥珀酸之銨鹽之至少一種。 5. 如申請專利範圍第4項之鈦系金屬、鎢系金屬、 春 欽鎢系金屬或該等之氮化物的蝕刻液,其中上述有機酸之 錢鹽爲選自檸檬酸氫二銨、檸檬酸三銨、草酸銨、甲酸銨 、乙酸銨之至少一種。 6. 如申請專利範圍第1至5項中任一項之鈦系金屬 '鎢系金屬、鈦鎢系金屬或該等之氮化物的蝕刻液,其中 金太系金屬或其氮化物相對於Al、Ni、Cu、Cr、Ru、Ta、 Si或以該等元素作爲主成分之合金之蝕刻速率比爲20以 上。 7. 如申請專利範圍第1至5項中任一項之鈦系金屬 -21 - 201014927 、鎢系金屬、駄鎢系金屬或該等之氮化物的蝕刻液,其中 鈦系金屬或其氮化物相對於玻璃、矽、氧化矽或氮化矽之 蝕刻速率比爲2 0以上。 8. —種電子裝置之製造方法,其特徵爲該方法具有 藉由申請專利範圍第1至7項中任一項之鈾刻液蝕刻鈦系 金屬 '鎢系金屬、鈦鎢系金屬或該等之氮化物之步驟。-22-
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US10155921B2 (en) | 2013-10-11 | 2018-12-18 | E I Dupont Ne Nemours And Company | Removal composition for selectively removing hard mask and methods thereof |
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