JP5363142B2 - 錫めっき皮膜の成膜方法 - Google Patents
錫めっき皮膜の成膜方法 Download PDFInfo
- Publication number
- JP5363142B2 JP5363142B2 JP2009046935A JP2009046935A JP5363142B2 JP 5363142 B2 JP5363142 B2 JP 5363142B2 JP 2009046935 A JP2009046935 A JP 2009046935A JP 2009046935 A JP2009046935 A JP 2009046935A JP 5363142 B2 JP5363142 B2 JP 5363142B2
- Authority
- JP
- Japan
- Prior art keywords
- tin
- copper
- film
- tin plating
- plating film
- 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.)
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- 238000007747 plating Methods 0.000 title claims abstract description 621
- 238000000034 method Methods 0.000 title claims abstract description 108
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims description 408
- 239000010949 copper Substances 0.000 claims abstract description 208
- 229910052802 copper Inorganic materials 0.000 claims abstract description 207
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 206
- 229910000881 Cu alloy Inorganic materials 0.000 claims abstract description 31
- 150000003609 titanium compounds Chemical class 0.000 claims abstract description 20
- 239000003638 chemical reducing agent Substances 0.000 claims description 37
- 238000006467 substitution reaction Methods 0.000 claims description 27
- 230000015572 biosynthetic process Effects 0.000 claims description 15
- 230000008719 thickening Effects 0.000 claims description 9
- 238000012545 processing Methods 0.000 abstract description 23
- 238000000151 deposition Methods 0.000 abstract description 22
- 230000008021 deposition Effects 0.000 abstract description 11
- 230000009467 reduction Effects 0.000 abstract description 8
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 239000010408 film Substances 0.000 description 391
- 238000011282 treatment Methods 0.000 description 121
- 230000008569 process Effects 0.000 description 65
- -1 tin inorganic acid salt Chemical class 0.000 description 47
- 229910000679 solder Inorganic materials 0.000 description 32
- 230000000052 comparative effect Effects 0.000 description 23
- 229910052751 metal Inorganic materials 0.000 description 23
- 239000002184 metal Substances 0.000 description 23
- 239000008139 complexing agent Substances 0.000 description 18
- 235000014113 dietary fatty acids Nutrition 0.000 description 13
- 229930195729 fatty acid Natural products 0.000 description 13
- 239000000194 fatty acid Substances 0.000 description 13
- 230000001603 reducing effect Effects 0.000 description 13
- 239000010936 titanium Substances 0.000 description 13
- 239000000758 substrate Substances 0.000 description 12
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 11
- 239000003054 catalyst Substances 0.000 description 11
- 239000004094 surface-active agent Substances 0.000 description 11
- 229910001432 tin ion Inorganic materials 0.000 description 11
- 238000006722 reduction reaction Methods 0.000 description 10
- 229910021626 Tin(II) chloride Inorganic materials 0.000 description 9
- 229910052719 titanium Inorganic materials 0.000 description 8
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 239000012528 membrane Substances 0.000 description 7
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 7
- 150000003839 salts Chemical class 0.000 description 7
- YONPGGFAJWQGJC-UHFFFAOYSA-K titanium(iii) chloride Chemical compound Cl[Ti](Cl)Cl YONPGGFAJWQGJC-UHFFFAOYSA-K 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 150000003606 tin compounds Chemical class 0.000 description 6
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 239000003963 antioxidant agent Substances 0.000 description 5
- 230000003078 antioxidant effect Effects 0.000 description 5
- 235000006708 antioxidants Nutrition 0.000 description 5
- 229910001431 copper ion Inorganic materials 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 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 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 description 4
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 125000004432 carbon atom Chemical group C* 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 239000006179 pH buffering agent Substances 0.000 description 4
- 230000003252 repetitive effect Effects 0.000 description 4
- 239000012279 sodium borohydride Substances 0.000 description 4
- 229910000033 sodium borohydride Inorganic materials 0.000 description 4
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 4
- IUTCEZPPWBHGIX-UHFFFAOYSA-N tin(2+) Chemical compound [Sn+2] IUTCEZPPWBHGIX-UHFFFAOYSA-N 0.000 description 4
- KWIUHFFTVRNATP-UHFFFAOYSA-N Betaine Natural products C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical compound C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 3
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 229960003237 betaine Drugs 0.000 description 3
- 238000010828 elution Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 150000004665 fatty acids Chemical class 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 235000021317 phosphate Nutrition 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 3
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 2
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 2
- 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 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
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 description 2
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 2
- QUSNBJAOOMFDIB-UHFFFAOYSA-N Ethylamine Chemical compound CCN QUSNBJAOOMFDIB-UHFFFAOYSA-N 0.000 description 2
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 2
- 239000004471 Glycine Substances 0.000 description 2
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 2
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- QNAYBMKLOCPYGJ-REOHCLBHSA-N L-alanine Chemical compound C[C@H](N)C(O)=O QNAYBMKLOCPYGJ-REOHCLBHSA-N 0.000 description 2
- KDXKERNSBIXSRK-YFKPBYRVSA-N L-lysine Chemical compound NCCCC[C@H](N)C(O)=O KDXKERNSBIXSRK-YFKPBYRVSA-N 0.000 description 2
- KDXKERNSBIXSRK-UHFFFAOYSA-N Lysine Natural products NCCCCC(N)C(O)=O KDXKERNSBIXSRK-UHFFFAOYSA-N 0.000 description 2
- 239000004472 Lysine Substances 0.000 description 2
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 description 2
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 2
- JYXGIOKAKDAARW-UHFFFAOYSA-N N-(2-hydroxyethyl)iminodiacetic acid Chemical compound OCCN(CC(O)=O)CC(O)=O JYXGIOKAKDAARW-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910001128 Sn alloy Inorganic materials 0.000 description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 2
- 235000011054 acetic acid Nutrition 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 235000004279 alanine Nutrition 0.000 description 2
- 150000005215 alkyl ethers Chemical class 0.000 description 2
- 125000005037 alkyl phenyl group Chemical group 0.000 description 2
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 235000001014 amino acid Nutrition 0.000 description 2
- 239000002280 amphoteric surfactant Substances 0.000 description 2
- 239000003945 anionic surfactant Substances 0.000 description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 2
- 239000004327 boric acid Substances 0.000 description 2
- 235000010338 boric acid Nutrition 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical compound OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 description 2
- 239000003093 cationic surfactant Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 235000015165 citric acid Nutrition 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 150000001879 copper Chemical class 0.000 description 2
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 2
- 238000002845 discoloration Methods 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 238000007772 electroless plating Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 description 2
- 230000009916 joint effect Effects 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 235000018977 lysine Nutrition 0.000 description 2
- 239000001630 malic acid Substances 0.000 description 2
- 235000011090 malic acid Nutrition 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- DNIAPMSPPWPWGF-UHFFFAOYSA-N monopropylene glycol Natural products CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 2
- 239000002736 nonionic surfactant Substances 0.000 description 2
- 239000006174 pH buffer Substances 0.000 description 2
- 229960003330 pentetic acid Drugs 0.000 description 2
- 235000011007 phosphoric acid Nutrition 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- GPWILPBSXYXSMN-UHFFFAOYSA-J propane-1-sulfonate;tin(4+) Chemical compound [Sn+4].CCCS([O-])(=O)=O.CCCS([O-])(=O)=O.CCCS([O-])(=O)=O.CCCS([O-])(=O)=O GPWILPBSXYXSMN-UHFFFAOYSA-J 0.000 description 2
- WGYKZJWCGVVSQN-UHFFFAOYSA-N propylamine Chemical compound CCCN WGYKZJWCGVVSQN-UHFFFAOYSA-N 0.000 description 2
- WQGWDDDVZFFDIG-UHFFFAOYSA-N pyrogallol Chemical compound OC1=CC=CC(O)=C1O WQGWDDDVZFFDIG-UHFFFAOYSA-N 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000011975 tartaric acid Substances 0.000 description 2
- 235000002906 tartaric acid Nutrition 0.000 description 2
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 2
- ZSUXOVNWDZTCFN-UHFFFAOYSA-L tin(ii) bromide Chemical compound Br[Sn]Br ZSUXOVNWDZTCFN-UHFFFAOYSA-L 0.000 description 2
- JTDNNCYXCFHBGG-UHFFFAOYSA-L tin(ii) iodide Chemical compound I[Sn]I JTDNNCYXCFHBGG-UHFFFAOYSA-L 0.000 description 2
- QHGNHLZPVBIIPX-UHFFFAOYSA-N tin(ii) oxide Chemical compound [Sn]=O QHGNHLZPVBIIPX-UHFFFAOYSA-N 0.000 description 2
- 235000012431 wafers Nutrition 0.000 description 2
- MNDGPLSORKUYSJ-UHFFFAOYSA-J 1,6,8,13-tetraoxa-7-stannaspiro[6.6]tridecane-2,5,9,12-tetrone Chemical compound O1C(=O)CCC(=O)O[Sn]21OC(=O)CCC(=O)O2 MNDGPLSORKUYSJ-UHFFFAOYSA-J 0.000 description 1
- OMPLFUALYIEKNF-UHFFFAOYSA-N 1-dodecyl-2-methylpyridin-1-ium Chemical class CCCCCCCCCCCC[N+]1=CC=CC=C1C OMPLFUALYIEKNF-UHFFFAOYSA-N 0.000 description 1
- NCBISIFFSNXYQJ-UHFFFAOYSA-N 1-dodecyl-4,5-dihydroimidazole Chemical class CCCCCCCCCCCCN1CCN=C1 NCBISIFFSNXYQJ-UHFFFAOYSA-N 0.000 description 1
- FFYRIXSGFSWFAQ-UHFFFAOYSA-N 1-dodecylpyridin-1-ium Chemical class CCCCCCCCCCCC[N+]1=CC=CC=C1 FFYRIXSGFSWFAQ-UHFFFAOYSA-N 0.000 description 1
- XXEAJQRNAACLFK-UHFFFAOYSA-J 1-hydroxyethanesulfonate tin(4+) Chemical compound [Sn+4].CC(O)S([O-])(=O)=O.CC(O)S([O-])(=O)=O.CC(O)S([O-])(=O)=O.CC(O)S([O-])(=O)=O XXEAJQRNAACLFK-UHFFFAOYSA-J 0.000 description 1
- KDOMZBRFVJSYDY-UHFFFAOYSA-N 2-(2,2-dihydroxyethylimino)acetic acid Chemical compound OC(CN=CC(=O)O)O KDOMZBRFVJSYDY-UHFFFAOYSA-N 0.000 description 1
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 description 1
- GEZAUFNYMZVOFV-UHFFFAOYSA-J 2-[(2-oxo-1,3,2$l^{5},4$l^{2}-dioxaphosphastannetan-2-yl)oxy]-1,3,2$l^{5},4$l^{2}-dioxaphosphastannetane 2-oxide Chemical compound [Sn+2].[Sn+2].[O-]P([O-])(=O)OP([O-])([O-])=O GEZAUFNYMZVOFV-UHFFFAOYSA-J 0.000 description 1
- RNMCCPMYXUKHAZ-UHFFFAOYSA-N 2-[3,3-diamino-1,2,2-tris(carboxymethyl)cyclohexyl]acetic acid Chemical compound NC1(N)CCCC(CC(O)=O)(CC(O)=O)C1(CC(O)=O)CC(O)=O RNMCCPMYXUKHAZ-UHFFFAOYSA-N 0.000 description 1
- XDJYNCLHESNUHA-UHFFFAOYSA-J 2-hydroxyethanesulfonate tin(4+) Chemical compound [Sn+4].OCCS([O-])(=O)=O.OCCS([O-])(=O)=O.OCCS([O-])(=O)=O.OCCS([O-])(=O)=O XDJYNCLHESNUHA-UHFFFAOYSA-J 0.000 description 1
- OQXQWBAPFLMGSZ-UHFFFAOYSA-H 2-hydroxypropane-1,2,3-tricarboxylate;tin(2+) Chemical compound [Sn+2].[Sn+2].[Sn+2].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O OQXQWBAPFLMGSZ-UHFFFAOYSA-H 0.000 description 1
- WRIREHMDTACSLC-UHFFFAOYSA-L 2-hydroxypropanoate;tin(2+) Chemical compound [Sn+2].CC(O)C([O-])=O.CC(O)C([O-])=O WRIREHMDTACSLC-UHFFFAOYSA-L 0.000 description 1
- YXTDAZMTQFUZHK-UHFFFAOYSA-L 5,6-dihydroxy-1,3,2$l^{2}-dioxastannepane-4,7-dione Chemical compound [Sn+2].[O-]C(=O)C(O)C(O)C([O-])=O YXTDAZMTQFUZHK-UHFFFAOYSA-L 0.000 description 1
- 239000004475 Arginine Substances 0.000 description 1
- KXDHJXZQYSOELW-UHFFFAOYSA-N Carbamic acid Chemical class NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 1
- 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 1
- RGHNJXZEOKUKBD-SQOUGZDYSA-M D-gluconate Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O RGHNJXZEOKUKBD-SQOUGZDYSA-M 0.000 description 1
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 description 1
- PQUCIEFHOVEZAU-UHFFFAOYSA-N Diammonium sulfite Chemical compound [NH4+].[NH4+].[O-]S([O-])=O PQUCIEFHOVEZAU-UHFFFAOYSA-N 0.000 description 1
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 description 1
- 229940120146 EDTMP Drugs 0.000 description 1
- DBVJJBKOTRCVKF-UHFFFAOYSA-N Etidronic acid Chemical compound OP(=O)(O)C(O)(C)P(O)(O)=O DBVJJBKOTRCVKF-UHFFFAOYSA-N 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
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerol Natural products OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical compound ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 description 1
- RAXXELZNTBOGNW-UHFFFAOYSA-O Imidazolium Chemical compound C1=C[NH+]=CN1 RAXXELZNTBOGNW-UHFFFAOYSA-O 0.000 description 1
- ODKSFYDXXFIFQN-BYPYZUCNSA-P L-argininium(2+) Chemical compound NC(=[NH2+])NCCC[C@H]([NH3+])C(O)=O ODKSFYDXXFIFQN-BYPYZUCNSA-P 0.000 description 1
- CKLJMWTZIZZHCS-REOHCLBHSA-N L-aspartic acid Chemical compound OC(=O)[C@@H](N)CC(O)=O CKLJMWTZIZZHCS-REOHCLBHSA-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
- KZSNJWFQEVHDMF-BYPYZUCNSA-N L-valine Chemical compound CC(C)[C@H](N)C(O)=O KZSNJWFQEVHDMF-BYPYZUCNSA-N 0.000 description 1
- 239000005639 Lauric acid Substances 0.000 description 1
- 235000021314 Palmitic acid Nutrition 0.000 description 1
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Description
2.無電解錫めっき浴及び無電解銅めっき浴
3.錫めっき皮膜の成膜方法
4.まとめ
本実施の形態に係る錫めっき皮膜の成膜方法は、被めっき物である電子工業用部品、回路等の銅又は銅合金部分に、無電解錫めっき浴を用いて所定の膜厚の錫めっき皮膜を形成する錫めっき皮膜の成膜方法であって、3価のチタン化合物を還元剤とする無電解錫めっき浴に被めっき物を浸漬させて錫めっき皮膜を形成する錫めっき皮膜形成工程と、錫めっき皮膜が形成された被めっき物を無電解銅めっき浴に浸漬し、その錫めっき皮膜上に銅めっき皮膜を形成する銅めっき皮膜形成工程と、銅めっき皮膜形成工程にて銅めっき皮膜が形成された被めっき物を無電解錫めっき浴に浸漬して、その銅めっき皮膜上に錫めっき皮膜を形成する厚膜化工程とを有するものである。これにより、所望とする膜厚を有する無電解錫めっき皮膜を成膜する。
まず、本実施の形態に係る錫めっき皮膜の成膜方法の説明に先立ち、本実施の形態の各めっき処理において用いるめっき浴について説明する。本実施の形態においては、無電解錫めっき浴を用いた無電解錫めっき処理と、無電解銅めっき浴を用いた無電解銅めっき処理とを交互に繰り返して、膜厚方向に錫めっき皮膜を形成させる。
無電解錫めっき処理において用いる無電解錫めっき浴は、少なくとも錫イオン源となる水溶性の錫塩と、チタン化合物からなる還元剤と、錯化剤とを含有する。
次に、錫めっき皮膜上に銅めっき皮膜を形成させる無電解銅めっき処理において用いる無電解銅めっき浴について説明する。本実施の形態に係る錫めっき皮膜の成膜方法では、上述したように、無電解錫めっき処理によって形成させた錫めっき皮膜上に、金属銅皮膜を形成させる。そして、金属銅皮膜が形成された銅又は銅合金等の被めっき物を再び還元型の無電解錫めっき浴に浸漬して錫めっき皮膜を形成する。このように、錫めっき皮膜の成膜方法は、錫めっき皮膜上に金属銅皮膜を形成して、その金属銅皮膜上に再び錫めっき皮膜を形成して錫めっき皮膜を成膜するものであり、またその金属銅皮膜形成と錫めっき皮膜形成とを交互に繰り返し行うことによって所望とする膜厚を有する錫めっき皮膜を成膜するものである。
本実施の形態に係る錫めっき皮膜の成膜方法は、被めっき物である電子工業用部品、回路等の銅又は銅合金部分に、上述した無電解錫めっき浴を用いて錫めっき皮膜を形成する錫めっき皮膜形成工程と、形成された錫めっき皮膜上に、上述した無電解銅めっき浴を用いて金属銅皮膜を形成する銅めっき皮膜形成工程と、形成された銅めっき皮膜上に錫めっき皮膜を形成する厚膜化工程とを有する。そして、所望とする膜厚となるまで、銅めっき皮膜形成工程と厚膜化工程とを交互に繰り返し実行して膜厚方向に錫めっき皮膜を形成する。
以上のように、本実施の形態に係る錫めっき皮膜の成膜方法は、3価のチタン化合物を還元剤とする無電解錫めっき浴に被めっき物を浸漬させて錫めっき皮膜を形成する錫めっき皮膜形成工程と、錫めっき皮膜が形成された被めっき物を無電解銅めっき浴に浸漬し、その錫めっき皮膜上に銅めっき皮膜を形成する銅めっき皮膜形成工程と、銅めっき皮膜形成工程にて銅めっき皮膜が形成された被めっき物を無電解錫めっき浴に浸漬して、その銅めっき皮膜上に錫めっき皮膜を形成する厚膜化工程とを有するものである。そして、銅めっき皮膜形成工程と厚膜化工程とを交互に繰り返し実行することによって、被めっき物の膜厚方向に所望とする膜厚まで錫めっき皮膜を厚膜化するものである。
BGA基板(上村工業株式会社製)(以下、被めっき物という。)に対して、下記の処理条件からなる実施例1及び2、参照例1〜3によって形成された錫めっき皮膜の膜厚を測定した。なお、被めっき物に対しては常法に従ってめっき前処理を行った。すなわち、めっき前処理工程として、クリーナ処理(50℃、2分:ACL-009 上村工業株式会社製)→酸洗処理(常温、1分:10%硫酸)→エッチング処理(25℃、1分:過硫酸ソーダ100g/L)→プレディップ処理(常温、1分:3%硫酸)を行った後に、無電解錫めっき処理を行った。なお、当該めっき前処理においては適宜、15〜60秒程度複数回の水洗処理を行った。
実施例1においては、表1に示す三塩化チタンを還元剤として含有する還元型の無電解錫めっき浴を用いて被めっき物に対し無電解錫めっき処理を15分行った後、表2に示す置換型の無電解銅めっき浴を用いて無電解銅めっき処理を60秒行った。そしてその後、形成された銅めっき皮膜上に再び表1に示す無電解錫めっき浴を用いて無電解錫めっき処理を15分行って錫めっき皮膜を形成し、以後同様にして、無電解銅めっき処理1分と無電解錫めっき処理15分を交互に繰り返し、錫めっき皮膜を形成させた。
実施例2においては、無電解錫めっき処理の処理時間を30分としたこと以外は、実施例1と同様に表1に示す無電解錫めっき浴と表2に示す無電解銅めっき浴を用いて、同様の処理を行った。
参照例1においては、実施例1において用いた表1に示す還元型の無電解錫めっき浴に浸漬させ無電解錫めっき処理のみ行って錫めっき皮膜を形成させた。なお、めっき浴の交換や浴組成物の補充等は行わなかった。
参照例2においては、実施例1において用いた表1に示す還元型の無電解錫めっき浴を用い、15分に一度の間隔でめっき浴を新しく交換して、無電解錫めっき処理のみ行って錫めっき皮膜を形成させた。
参照例3においては、実施例1において用いた表1に示す還元型の無電解錫めっき浴を用い、TiCl3/NTA錯塩水溶液を注加しながら同じめっき浴に浸漬させて、無電解錫めっき処理のみを行って錫めっき皮膜を形成させた。なお、TiCl3/NTA錯塩水溶液は、45分毎にめっき浴に添加し、消費分の三塩化チタンを補給した。
次に、下記の処理条件からなる実施例3によって形成された錫めっき皮膜の膜厚を測定し、無電解銅めっき処理の処理時間と形成される錫めっき皮膜の膜厚との関係について検討した。
実施例3として、上述と同様のめっき前処理を施した被めっき物に対して、実施例1及び2において用いた表1に示す還元型の無電解錫めっき浴によって無電解錫めっき処理を15分行った後、表2に示す無電解錫めっき浴により下記の表4に示される所定のめっき処理時間で無電解銅めっき処理を行った。その後、再び表1に示す還元型の無電解錫めっき浴によって無電解錫めっき処理を15分行った。すなわち、15分の無電解錫めっき処理と所定時間の無電解銅めっき処理との交互の操作を1回ずつ行った場合における錫めっき皮膜の膜厚を測定した。
比較例1として、還元剤として水素化ホウ素ナトリウムを含有させた表5に示す無電解錫めっき浴(SBH浴)を用いて無電解錫めっき処理を行って錫めっき皮膜を形成させた。
比較例2として、還元剤を含有しない表6に示す置換型の無電解錫めっき浴(置換浴)を用いて無電解錫めっき処理を行って錫めっき皮膜を形成させた。
次に、下記の実施例4〜6と比較例3〜5により、錫めっき皮膜の膜厚とはんだ接合性との関係について評価した。
実施例4では、BGA基板(上村工業株式会社製 パット径φ0.5mm)に対し、上記表1に示す三塩化チタンを還元剤として含有する無電解錫めっき浴(Ti浴)を用いて無電解錫めっき処理を15分行った後、上記表2に示す無電解銅めっき浴を用いて無電解銅めっき処理(置換銅)を30秒行い、この操作を交互に5μmの錫めっき皮膜が形成されるまで繰り返し実行した。
実施例5では、上記表2に示す無電解銅めっき浴を用いた無電解銅めっき処理を60秒行ったこと以外は、実施例4と同様に処理を行った。
実施例6では、上記表2に示す無電解銅めっき浴を用いた無電解銅めっき処理を180秒行ったこと以外は、実施例4と同様に処理を行った。
比較例3では、実施例4と同様のBGA基板に対し、無電解銅めっき処理を行わずに、上記表1に示す三塩化チタンを還元剤として含有する無電解錫めっき浴を用いて無電解錫めっき処理のみを行い、錫めっき皮膜を形成させた。
比較例4では、実施例4と同様のBGA基板に対し、上記5に示す水素化ホウ素ナトリウムを還元剤として含有する無電解錫めっき浴(SBH浴)を用いて無電解錫めっき処理のみを行い、錫めっき皮膜を形成させた。
比較例5では、実施例4と同様のBGA基板に対し、上記6に示す還元剤を含まない置換型の無電解錫めっき浴(置換浴)を用いて無電解錫めっき処理のみを行い、錫めっき皮膜を形成させた。
〔測定条件〕
測定方式:ボールプルテスト
基板:上村工業(株)製BGA基板(パット径 φ0.5mm)
半田ボール:千住金属製 φ0.6mm Sn−3.0Ag−0.5Cu
リフロー装置:タムラ製作所製 TMR−15−22LH
リフロー条件:Top 240℃
リフロー環境:Air
リフロー回数:1回
フラックス:千住金属製 529D−1(RMAタイプ)
テストスピード:1000μm/秒
リフロー前の熱処理:150℃−8時間。
Claims (2)
- 銅又は銅合金に、3価のチタン化合物を還元剤とする無電解錫めっき浴を用いて所定の膜厚の錫めっき皮膜を形成する錫めっき皮膜の成膜方法において、
上記3価のチタン化合物を還元剤とする無電解錫めっき浴に上記銅又は銅合金を浸漬させて錫めっき皮膜を形成する錫めっき皮膜形成工程と、
錫めっき皮膜が形成された銅又は銅合金を無電解銅めっき浴に浸漬し、該錫めっき皮膜上に置換反応により銅めっき皮膜を形成する銅めっき皮膜形成工程と、
上記銅めっき皮膜形成工程にて銅めっき皮膜が形成された銅又は銅合金を上記無電解錫めっき浴に浸漬し、該銅めっき皮膜上に錫めっき皮膜を形成する厚膜化工程とを有し、
上記銅めっき皮膜形成工程における金属銅置換量が0.8×10 −6 g/dm 2 〜0.089g/dm 2 である錫めっき皮膜の成膜方法。 - 上記銅めっき皮膜形成工程と上記厚膜化工程とを交互に繰り返し実行して、上記銅又は銅合金の膜厚方向に錫めっき皮膜を厚膜化する請求項1記載の錫めっき皮膜の成膜方法。
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