JP2012062572A - 銅または銅合金用エッチング液 - Google Patents
銅または銅合金用エッチング液 Download PDFInfo
- Publication number
- JP2012062572A JP2012062572A JP2011175477A JP2011175477A JP2012062572A JP 2012062572 A JP2012062572 A JP 2012062572A JP 2011175477 A JP2011175477 A JP 2011175477A JP 2011175477 A JP2011175477 A JP 2011175477A JP 2012062572 A JP2012062572 A JP 2012062572A
- Authority
- JP
- Japan
- Prior art keywords
- copper
- acid
- etching
- salt
- copper alloy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005530 etching Methods 0.000 title claims abstract description 81
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 75
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 75
- 239000010949 copper Substances 0.000 title claims abstract description 75
- 229910000881 Cu alloy Inorganic materials 0.000 title claims abstract description 43
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000002253 acid Substances 0.000 claims abstract description 41
- 239000000758 substrate Substances 0.000 claims abstract description 29
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000002738 chelating agent Substances 0.000 claims abstract description 22
- 229910000570 Cupronickel Inorganic materials 0.000 claims abstract description 14
- 239000004094 surface-active agent Substances 0.000 claims abstract description 14
- 125000006353 oxyethylene group Chemical group 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 19
- 150000007524 organic acids Chemical class 0.000 claims description 19
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 9
- ABLZXFCXXLZCGV-UHFFFAOYSA-N phosphonic acid group Chemical group P(O)(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 claims description 8
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 7
- 125000000542 sulfonic acid group Chemical group 0.000 claims description 6
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 description 65
- -1 gold metals Chemical class 0.000 description 31
- 239000000243 solution Substances 0.000 description 25
- 229910052759 nickel Inorganic materials 0.000 description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 12
- 229910052710 silicon Inorganic materials 0.000 description 12
- 239000010703 silicon Substances 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 9
- 239000002518 antifoaming agent Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 239000003945 anionic surfactant Substances 0.000 description 7
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 7
- 229920001577 copolymer Polymers 0.000 description 6
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 5
- 150000003973 alkyl amines Chemical class 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000007747 plating Methods 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 239000002202 Polyethylene glycol Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- LNTHITQWFMADLM-UHFFFAOYSA-N gallic acid Chemical compound OC(=O)C1=CC(O)=C(O)C(O)=C1 LNTHITQWFMADLM-UHFFFAOYSA-N 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- 229920001223 polyethylene glycol Polymers 0.000 description 4
- 150000005846 sugar alcohols Polymers 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical group O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- 125000005233 alkylalcohol group Chemical group 0.000 description 3
- 150000001412 amines Chemical class 0.000 description 3
- 239000003963 antioxidant agent Substances 0.000 description 3
- 235000006708 antioxidants Nutrition 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- UAOMVDZJSHZZME-UHFFFAOYSA-N diisopropylamine Chemical compound CC(C)NC(C)C UAOMVDZJSHZZME-UHFFFAOYSA-N 0.000 description 3
- JRBPAEWTRLWTQC-UHFFFAOYSA-N dodecylamine Chemical compound CCCCCCCCCCCCN JRBPAEWTRLWTQC-UHFFFAOYSA-N 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- HEBKCHPVOIAQTA-UHFFFAOYSA-N meso ribitol Natural products OCC(O)C(O)C(O)CO HEBKCHPVOIAQTA-UHFFFAOYSA-N 0.000 description 3
- 150000007522 mineralic acids Chemical class 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 description 2
- YIWUKEYIRIRTPP-UHFFFAOYSA-N 2-ethylhexan-1-ol Chemical compound CCCCC(CC)CO YIWUKEYIRIRTPP-UHFFFAOYSA-N 0.000 description 2
- SYBYTAAJFKOIEJ-UHFFFAOYSA-N 3-Methylbutan-2-one Chemical compound CC(C)C(C)=O SYBYTAAJFKOIEJ-UHFFFAOYSA-N 0.000 description 2
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical group N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 2
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 2
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 2
- UNXHWFMMPAWVPI-UHFFFAOYSA-N Erythritol Natural products OCC(O)C(O)CO UNXHWFMMPAWVPI-UHFFFAOYSA-N 0.000 description 2
- QUSNBJAOOMFDIB-UHFFFAOYSA-N Ethylamine Chemical compound CCN QUSNBJAOOMFDIB-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 description 2
- QCOGKXLOEWLIDC-UHFFFAOYSA-N N-methylbutylamine Chemical compound CCCCNC QCOGKXLOEWLIDC-UHFFFAOYSA-N 0.000 description 2
- GLUUGHFHXGJENI-UHFFFAOYSA-N Piperazine Chemical compound C1CNCCN1 GLUUGHFHXGJENI-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- ZTHYODDOHIVTJV-UHFFFAOYSA-N Propyl gallate Chemical compound CCCOC(=O)C1=CC(O)=C(O)C(O)=C1 ZTHYODDOHIVTJV-UHFFFAOYSA-N 0.000 description 2
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 2
- KYQCOXFCLRTKLS-UHFFFAOYSA-N Pyrazine Chemical compound C1=CN=CC=N1 KYQCOXFCLRTKLS-UHFFFAOYSA-N 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 125000005263 alkylenediamine group Chemical group 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 150000004982 aromatic amines Chemical class 0.000 description 2
- 238000000231 atomic layer deposition Methods 0.000 description 2
- 150000007514 bases Chemical class 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- HQABUPZFAYXKJW-UHFFFAOYSA-N butan-1-amine Chemical compound CCCCN HQABUPZFAYXKJW-UHFFFAOYSA-N 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- KBPLFHHGFOOTCA-UHFFFAOYSA-N caprylic alcohol Natural products CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 description 2
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical compound OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- BGTOWKSIORTVQH-UHFFFAOYSA-N cyclopentanone Chemical compound O=C1CCCC1 BGTOWKSIORTVQH-UHFFFAOYSA-N 0.000 description 2
- LQZZUXJYWNFBMV-UHFFFAOYSA-N dodecan-1-ol Chemical class CCCCCCCCCCCCO LQZZUXJYWNFBMV-UHFFFAOYSA-N 0.000 description 2
- DSGUSEBCDAKBCM-UHFFFAOYSA-N ethane-1,2-disulfonic acid;dihydrate Chemical compound O.O.OS(=O)(=O)CCS(O)(=O)=O DSGUSEBCDAKBCM-UHFFFAOYSA-N 0.000 description 2
- LZCLXQDLBQLTDK-UHFFFAOYSA-N ethyl 2-hydroxypropanoate Chemical compound CCOC(=O)C(C)O LZCLXQDLBQLTDK-UHFFFAOYSA-N 0.000 description 2
- XLLIQLLCWZCATF-UHFFFAOYSA-N ethylene glycol monomethyl ether acetate Natural products COCCOC(C)=O XLLIQLLCWZCATF-UHFFFAOYSA-N 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- HVQAJTFOCKOKIN-UHFFFAOYSA-N flavonol Chemical compound O1C2=CC=CC=C2C(=O)C(O)=C1C1=CC=CC=C1 HVQAJTFOCKOKIN-UHFFFAOYSA-N 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 229940074391 gallic acid Drugs 0.000 description 2
- 235000004515 gallic acid Nutrition 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical compound CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 description 2
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 2
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- 239000003112 inhibitor Substances 0.000 description 2
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- 150000002576 ketones Chemical class 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002932 luster Substances 0.000 description 2
- FBSFWRHWHYMIOG-UHFFFAOYSA-N methyl 3,4,5-trihydroxybenzoate Chemical compound COC(=O)C1=CC(O)=C(O)C(O)=C1 FBSFWRHWHYMIOG-UHFFFAOYSA-N 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- XUYJLQHKOGNDPB-UHFFFAOYSA-N phosphonoacetic acid Chemical compound OC(=O)CP(O)(O)=O XUYJLQHKOGNDPB-UHFFFAOYSA-N 0.000 description 2
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- 150000003852 triazoles Chemical class 0.000 description 2
- GETQZCLCWQTVFV-UHFFFAOYSA-N trimethylamine Chemical compound CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 description 2
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- JPGSFSFMINKKJZ-UHFFFAOYSA-N 2-[1,2-dicarboxyethyl(hydroxy)amino]butanedioic acid Chemical compound OC(=O)CC(C(O)=O)N(O)C(CC(O)=O)C(O)=O JPGSFSFMINKKJZ-UHFFFAOYSA-N 0.000 description 1
- 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
- ZXNFXBYPFOIXKT-UHFFFAOYSA-N 2-[2-[bis(carboxymethyl)amino]ethyl-(carboxymethyl)amino]-4,4-dihydroxybutanoic acid Chemical compound OC(O)CC(C(O)=O)N(CC(O)=O)CCN(CC(O)=O)CC(O)=O ZXNFXBYPFOIXKT-UHFFFAOYSA-N 0.000 description 1
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- 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
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- 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
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- 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
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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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Abstract
【解決手段】 銅または銅合金とニッケルを同時に有する電子基板から銅または銅合金を選択的にエッチングする工程用のエッチング液であって、酸基を分子内に有するキレート剤(A)、過酸化水素(B)、およびオキシエチレン鎖を分子内に有する界面活性剤(C)を必須成分とする銅または銅合金用エッチング液。
【選択図】 図4
Description
すなわち、本発明は、銅または銅合金とニッケルを同時に有する電子基板から銅または銅合金を選択的にエッチングする工程用のエッチング液であって、酸基を分子内に有するキレート剤(A)、過酸化水素(B)、およびオキシエチレン鎖を分子内に有する界面活性剤(C)を必須成分とする銅または銅合金用エッチング液;並びにこのエッチング液を用いて、銅または銅合金とニッケルを同時に有する電子基板から選択的に銅または銅合金をエッチングする工程を含むことを特徴とする電子基板の製造方法である。
本発明のおける酸基を分子内に有するキレート剤(A)は、キレート効果を有するための官能基を2個以上有するものであって、そのうちの1個以上が酸基であれば、他の官能基として酸基でもよいし、例えば中性の水酸基、フェノール性水酸基などでもよい。
本発明のおけるキレート剤(A)中の酸基としては、カルボキシル基、ホスホン基、スルホン基、リン酸基、硫酸基、硝酸基、ホウ酸基などが挙げられる。
また、酸基を分子内に有するキレート剤(A)としては、キレート効果を示す水酸基を分子内に有するものであれば、酸基としてカルボキシル基、ホスホン酸基またはスルホン酸基を1個だけ含むキレート剤(A5)であっても差しつかえない。
エチレンオキサイドプロピレンオキサイド共重合体(C4)を(C)成分として用いると消泡剤としての効果も有しているため特に有益である。
イミダゾール類としては、イミダゾール、ベンズイミダゾール、ベンズイミダゾールカルボン酸、イミダゾール−2−カルボン酸、イミダゾール−4−カルボン酸、イミダゾール−2−カルボキシアルデヒド、イミダゾール−4−カルボキシアルデヒド、4−イミダゾールジチオカルボン酸等が挙げられる。
チオール化合物としては、メルカプトチアゾール、メルカプトエタノール、チオグリセロール等が挙げられる。
糖アルコールとしては、エリスリトール、トレイトール、アラビニトール、キシリトール、リビトール、マンニトール、ソルビトール、マルチトイノシトール等が挙げられる。
酸化防止剤としては、カテキン、トコフェロール、カテコール、メチルカテコール、エチルカテコール、tert−ブチルカテコール、没食子酸、没食子酸メチル、没食子酸プロピル等のフェノール類、3−ヒドロキシフラボン、アスコルビン酸等が挙げられる。
その目的で添加する塩基性化合物は、アンモニア、アミンまたはテトラアルキルアンモニウムヒドロキシド、含窒素複素環式化合物である。また、その目的で添加する酸性化合物は、硫酸、塩酸、硝酸、フッ化水素酸などの無機酸、酢酸などの有機酸である。
表1に記載したキレート剤(A)、過酸化水素(B)、界面活性剤(C)、および水をポリプロピレン製の容器中で混合して、本発明のエッチング液と比較のためのエッチング液を得た。
(A−1):クエン酸
(A−2):60%1−ヒドロキシエチリデン−1,1−ジホスホン酸水溶液
(A−3):1,2−エタンジスルホン酸二水和物
(A−4):ニトリロトリスメチレンホスホン酸
(B−1):35%過酸化水素水
(C−1):ラウリルアミンのEO8モル付加物
(C−2):ラウリルアルコールのEO2.5モル付加物の硫酸エステルナトリウム塩
(C−3):ポリオキシプロピレングリコールのEO付加物(プロピレンオキサイド平均31モル、エチレンオキサイド平均45モル)
(C’−1):塩化ステアリルトリメチルアンモニウム
銅のエッチング時間を、以下の操作方法で銅シード層の光沢が消失するまでの時間で評価した。
(1)シリコン基板に加工を加えて図4の状態まで作成したウエハ(銅シード層の厚み1μm)を15mm角の正方形に切断してテストピースを作成した。なお、走査型電子顕微鏡(日立ハイテク社製S−4800)でウエハを1cm各に切断したテストピースの断面を観察したところ、バンプの幅は約30μm、バンプの高さは約8μmであった。銅シード層の厚みは1μmであった。
(2)実施例1〜7および比較例1〜5で作成したエッチング液をポリプロピレン製の容器に入れて撹拌し、この中に上記のテストピースを浸漬する。
(3)液中に浸漬した状態でテストピースの表面を目視で観察し、銅シード層の全面の銅光沢が消失する(図5の3:チタン層の全面が見える状態)までの時間を測定する。
この目的で使用される本発明のエッチング液においては、 銅光沢の消失時間が10分以内であることが好ましい。
なお、60分で光沢が消失しなかったものは、60分で浸漬を中止し、表1中には「>60」と表記した。
走査型電子顕微鏡(日立ハイテク社製S−4800)で、銅シード層をエッチングする前のテストピースとエッチング後のテストピースのそれぞれニッケル層の浸食の程度とその幅が確認できる側面の写真撮影をした。そして、写真画像から、銅シード層をエッチングする前のテストピースのニッケル層(図4の7)の幅A1(μm)と、エッチング後のテストピースのニッケル層(図5の7)の幅A2(μm)を測定した。エッチング前後のニッケル層の幅の差A1−A2が1.0μm未満のものを○、差が1.0μm以上のものを×と判定した。
一方、本発明のオキシエチレン鎖を分子内に有する界面活性剤(C)を含んでいない比較例1および比較例2は銅シード層のエッチングは速いものの、ニッケルをエッチングしてしまい、バンプが変形し、使用できなくなる。
また、本発明の本発明のキレート剤(A)の代わりに硫酸を使用した比較例3についても銅シード層のエッチングは速いものの、ニッケルをエッチングしてしまい、バンプが変形し、使用できなくなる。
本発明のキレート剤(A)を含まない比較例4については銅シード層もニッケルもエッチングしない。
過酸化水素(B)を含まない比較例5については銅シード層もニッケルもエッチングしない。
1: シリコン基板
2: シリコン酸化膜
3: チタン層
4: 銅シード層
5: レジスト樹脂
6: 銅めっき層
7: ニッケルめっき層
8: 金めっき層
9: バンプ
Claims (7)
- 銅または銅合金とニッケルを同時に有する電子基板から銅または銅合金を選択的にエッチングする工程用のエッチング液であって、酸基を分子内に有するキレート剤(A)、過酸化水素(B)、およびオキシエチレン鎖を分子内に有する界面活性剤(C)を必須成分とする銅または銅合金用エッチング液。
- 該キレート剤(A)が、ホスホン酸基および/またはスルホン酸基を分子内に合計2個以上有する有機酸である請求項1記載のエッチング液。
- 該キレート剤(A)がカルボキシル基を分子内に2個以上有する有機酸である請求項1記載のエッチング液。
- 該界面活性剤(C)が脂肪族アミンのエチレンオキサイド付加物である請求項1〜3いずれか記載のエッチング液。
- 該キレート剤(A)と過酸化水素(B)の重量比(A)/(B)が1〜30である請求項1〜4いずれか記載のエッチング液。
- 該キレート剤(A)と該界面活性剤(C)の重量比(A)/(C)が1〜100である請求項1〜5いずれか記載のエッチング液。
- 請求項1〜6いずれか記載の銅または銅合金用エッチング液を用いて、銅または銅合金とニッケルを同時に有する電子基板から選択的に銅または銅合金をエッチングする工程を含むことを特徴とする電子基板の製造方法。
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Application Number | Priority Date | Filing Date | Title |
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JP2011175477A JP6101421B2 (ja) | 2010-08-16 | 2011-08-11 | 銅または銅合金用エッチング液 |
KR1020177035403A KR101891941B1 (ko) | 2010-08-16 | 2011-08-16 | 구리 또는 구리 합금용 에칭 용액 |
CN201610560710.9A CN106435587B (zh) | 2010-08-16 | 2011-08-16 | 用于铜或铜合金的蚀刻溶液 |
CN201180039954.8A CN103080382B (zh) | 2010-08-16 | 2011-08-16 | 用于铜或铜合金的蚀刻溶液 |
KR1020137005886A KR101809302B1 (ko) | 2010-08-16 | 2011-08-16 | 구리 또는 구리 합금용 에칭 용액 |
SG2013011358A SG187857A1 (en) | 2010-08-16 | 2011-08-16 | Etching solution for copper or copper alloy |
TW100129156A TWI565834B (zh) | 2010-08-16 | 2011-08-16 | 銅或銅合金用之蝕刻液 |
SG10201506427XA SG10201506427XA (en) | 2010-08-16 | 2011-08-16 | Etching solution for copper or copper alloy |
PCT/US2011/047927 WO2012024300A2 (en) | 2010-08-16 | 2011-08-16 | Etching solution for copper or copper alloy |
US13/816,862 US10570522B2 (en) | 2010-08-16 | 2011-08-16 | Etching solution for copper or copper alloy |
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KR20170140420A (ko) | 2017-12-20 |
KR101809302B1 (ko) | 2017-12-14 |
CN103080382B (zh) | 2016-08-17 |
CN106435587A (zh) | 2017-02-22 |
SG10201506427XA (en) | 2015-10-29 |
CN106435587B (zh) | 2019-10-01 |
KR20130137606A (ko) | 2013-12-17 |
US20130270217A1 (en) | 2013-10-17 |
TW201213613A (en) | 2012-04-01 |
WO2012024300A2 (en) | 2012-02-23 |
SG187857A1 (en) | 2013-03-28 |
JP6101421B2 (ja) | 2017-03-22 |
US10570522B2 (en) | 2020-02-25 |
WO2012024300A9 (en) | 2012-11-08 |
KR101891941B1 (ko) | 2018-08-27 |
TWI565834B (zh) | 2017-01-11 |
CN103080382A (zh) | 2013-05-01 |
WO2012024300A3 (en) | 2012-05-31 |
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