WO2015046794A1 - 식각액 조성물, 및 이를 이용한 금속 배선과 박막 트랜지스터 기판 형성 방법 - Google Patents
식각액 조성물, 및 이를 이용한 금속 배선과 박막 트랜지스터 기판 형성 방법 Download PDFInfo
- Publication number
- WO2015046794A1 WO2015046794A1 PCT/KR2014/008593 KR2014008593W WO2015046794A1 WO 2015046794 A1 WO2015046794 A1 WO 2015046794A1 KR 2014008593 W KR2014008593 W KR 2014008593W WO 2015046794 A1 WO2015046794 A1 WO 2015046794A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- copper
- metal film
- acid
- potassium
- ammonium
- Prior art date
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 131
- 239000002184 metal Substances 0.000 title claims abstract description 131
- 239000000203 mixture Substances 0.000 title claims abstract description 118
- 239000000758 substrate Substances 0.000 title claims abstract description 54
- 239000010409 thin film Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims description 49
- 239000010408 film Substances 0.000 claims abstract description 103
- 238000005530 etching Methods 0.000 claims abstract description 81
- 239000010949 copper Substances 0.000 claims abstract description 73
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 59
- 229910052802 copper Inorganic materials 0.000 claims abstract description 56
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 claims abstract description 27
- 150000003839 salts Chemical class 0.000 claims abstract description 24
- 150000001805 chlorine compounds Chemical class 0.000 claims abstract description 19
- 150000002222 fluorine compounds Chemical class 0.000 claims abstract description 19
- 150000001879 copper Chemical class 0.000 claims abstract description 17
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims abstract description 16
- 150000007522 mineralic acids Chemical class 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 40
- -1 azole compound Chemical class 0.000 claims description 32
- 239000003963 antioxidant agent Substances 0.000 claims description 28
- 235000006708 antioxidants Nutrition 0.000 claims description 28
- 229920002120 photoresistant polymer Polymers 0.000 claims description 28
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 24
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 23
- 239000010936 titanium Substances 0.000 claims description 23
- 229910052719 titanium Inorganic materials 0.000 claims description 23
- 230000003078 antioxidant effect Effects 0.000 claims description 22
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 21
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 21
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 20
- 235000010323 ascorbic acid Nutrition 0.000 claims description 20
- 239000011668 ascorbic acid Substances 0.000 claims description 20
- 229960005070 ascorbic acid Drugs 0.000 claims description 19
- RWSXRVCMGQZWBV-WDSKDSINSA-N glutathione Chemical compound OC(=O)[C@@H](N)CCC(=O)N[C@@H](CS)C(=O)NCC(O)=O RWSXRVCMGQZWBV-WDSKDSINSA-N 0.000 claims description 18
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 14
- 229910020366 ClO 4 Inorganic materials 0.000 claims description 12
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 12
- 235000019270 ammonium chloride Nutrition 0.000 claims description 12
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 claims description 12
- 239000011780 sodium chloride Substances 0.000 claims description 12
- 239000011734 sodium Substances 0.000 claims description 10
- 108010024636 Glutathione Proteins 0.000 claims description 9
- 229960003180 glutathione Drugs 0.000 claims description 9
- 235000003969 glutathione Nutrition 0.000 claims description 9
- AGBQKNBQESQNJD-UHFFFAOYSA-M lipoate Chemical compound [O-]C(=O)CCCCC1CCSS1 AGBQKNBQESQNJD-UHFFFAOYSA-M 0.000 claims description 9
- 235000019136 lipoic acid Nutrition 0.000 claims description 9
- 239000001103 potassium chloride Substances 0.000 claims description 9
- 235000011164 potassium chloride Nutrition 0.000 claims description 9
- 229960002663 thioctic acid Drugs 0.000 claims description 9
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 8
- 235000005074 zinc chloride Nutrition 0.000 claims description 8
- 239000011592 zinc chloride Substances 0.000 claims description 8
- AXZAYXJCENRGIM-UHFFFAOYSA-J dipotassium;tetrabromoplatinum(2-) Chemical compound [K+].[K+].[Br-].[Br-].[Br-].[Br-].[Pt+2] AXZAYXJCENRGIM-UHFFFAOYSA-J 0.000 claims description 6
- 229910001487 potassium perchlorate Inorganic materials 0.000 claims description 6
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 6
- BAZAXWOYCMUHIX-UHFFFAOYSA-M sodium perchlorate Chemical compound [Na+].[O-]Cl(=O)(=O)=O BAZAXWOYCMUHIX-UHFFFAOYSA-M 0.000 claims description 6
- 229910001488 sodium perchlorate Inorganic materials 0.000 claims description 6
- 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 claims description 5
- ULRPISSMEBPJLN-UHFFFAOYSA-N 2h-tetrazol-5-amine Chemical compound NC1=NN=NN1 ULRPISSMEBPJLN-UHFFFAOYSA-N 0.000 claims description 5
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims description 5
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 5
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 5
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 5
- GDDNTTHUKVNJRA-UHFFFAOYSA-N 3-bromo-3,3-difluoroprop-1-ene Chemical compound FC(F)(Br)C=C GDDNTTHUKVNJRA-UHFFFAOYSA-N 0.000 claims description 4
- MIMUSZHMZBJBPO-UHFFFAOYSA-N 6-methoxy-8-nitroquinoline Chemical compound N1=CC=CC2=CC(OC)=CC([N+]([O-])=O)=C21 MIMUSZHMZBJBPO-UHFFFAOYSA-N 0.000 claims description 4
- NTDFJPCHHGBHCO-UHFFFAOYSA-N 7,9-dihydro-3H-purine-2,6,8-trione Chemical compound OC1=NC(O)=C2NC(O)=NC2=N1.N1C(=O)NC(=O)C2=C1NC(=O)N2 NTDFJPCHHGBHCO-UHFFFAOYSA-N 0.000 claims description 4
- WTKZEGDFNFYCGP-UHFFFAOYSA-N Pyrazole Chemical compound C=1C=NNC=1 WTKZEGDFNFYCGP-UHFFFAOYSA-N 0.000 claims description 4
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 4
- JWQMZGJKIAJVFE-UHFFFAOYSA-L azanium copper phosphate Chemical compound [NH4+].[Cu+2].[O-]P([O-])([O-])=O JWQMZGJKIAJVFE-UHFFFAOYSA-L 0.000 claims description 4
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims description 4
- 239000012964 benzotriazole Substances 0.000 claims description 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 4
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 claims description 4
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 4
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 claims description 4
- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 claims description 4
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 claims description 4
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 4
- MHFJSVNTDPZPQP-UHFFFAOYSA-N potassium;2h-tetrazol-5-amine Chemical compound [K].NC=1N=NNN=1 MHFJSVNTDPZPQP-UHFFFAOYSA-N 0.000 claims description 4
- LEMQFBIYMVUIIG-UHFFFAOYSA-N trifluoroborane;hydrofluoride Chemical compound F.FB(F)F LEMQFBIYMVUIIG-UHFFFAOYSA-N 0.000 claims description 4
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- VBKNTGMWIPUCRF-UHFFFAOYSA-M potassium;fluoride;hydrofluoride Chemical compound F.[F-].[K+] VBKNTGMWIPUCRF-UHFFFAOYSA-M 0.000 claims description 3
- BFXAWOHHDUIALU-UHFFFAOYSA-M sodium;hydron;difluoride Chemical compound F.[F-].[Na+] BFXAWOHHDUIALU-UHFFFAOYSA-M 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 3
- 229910017971 NH4BF4 Inorganic materials 0.000 claims 1
- LEHOTFFKMJEONL-UHFFFAOYSA-N Uric Acid Chemical compound N1C(=O)NC(=O)C2=C1NC(=O)N2 LEHOTFFKMJEONL-UHFFFAOYSA-N 0.000 claims 1
- TVWHNULVHGKJHS-UHFFFAOYSA-N Uric acid Natural products N1C(=O)NC(=O)C2NC(=O)NC21 TVWHNULVHGKJHS-UHFFFAOYSA-N 0.000 claims 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims 1
- 239000004327 boric acid Substances 0.000 claims 1
- 229940116269 uric acid Drugs 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 17
- 150000001875 compounds Chemical class 0.000 abstract description 6
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- 230000001180 sulfating effect Effects 0.000 abstract 2
- 230000000052 comparative effect Effects 0.000 description 49
- 239000010410 layer Substances 0.000 description 40
- 239000002244 precipitate Substances 0.000 description 33
- 230000008569 process Effects 0.000 description 15
- 238000011156 evaluation Methods 0.000 description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 9
- 239000004065 semiconductor Substances 0.000 description 9
- 230000007547 defect Effects 0.000 description 8
- 150000002500 ions Chemical class 0.000 description 8
- 238000000206 photolithography Methods 0.000 description 8
- 102100036464 Activated RNA polymerase II transcriptional coactivator p15 Human genes 0.000 description 7
- 101000713904 Homo sapiens Activated RNA polymerase II transcriptional coactivator p15 Proteins 0.000 description 7
- 229910004444 SUB1 Inorganic materials 0.000 description 7
- 230000008859 change Effects 0.000 description 7
- 239000000460 chlorine Substances 0.000 description 7
- 238000003860 storage Methods 0.000 description 7
- 238000002161 passivation Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 5
- 229910004438 SUB2 Inorganic materials 0.000 description 5
- 101100311330 Schizosaccharomyces pombe (strain 972 / ATCC 24843) uap56 gene Proteins 0.000 description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000001590 oxidative effect Effects 0.000 description 5
- 101150018444 sub2 gene Proteins 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000007800 oxidant agent Substances 0.000 description 4
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 229910001431 copper ion Inorganic materials 0.000 description 3
- 239000000284 extract Substances 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- 229910016569 AlF 3 Inorganic materials 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 101150089655 Ins2 gene Proteins 0.000 description 2
- VCUFZILGIRCDQQ-KRWDZBQOSA-N N-[[(5S)-2-oxo-3-(2-oxo-3H-1,3-benzoxazol-6-yl)-1,3-oxazolidin-5-yl]methyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C1O[C@H](CN1C1=CC2=C(NC(O2)=O)C=C1)CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F VCUFZILGIRCDQQ-KRWDZBQOSA-N 0.000 description 2
- 229910017855 NH 4 F Inorganic materials 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 101100072652 Xenopus laevis ins-b gene Proteins 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 2
- 238000000724 energy-dispersive X-ray spectrum Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 2
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 description 1
- AWFYPPSBLUWMFQ-UHFFFAOYSA-N 2-[5-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]-1,3,4-oxadiazol-2-yl]-1-(1,4,6,7-tetrahydropyrazolo[4,3-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1=NN=C(O1)CC(=O)N1CC2=C(CC1)NN=C2 AWFYPPSBLUWMFQ-UHFFFAOYSA-N 0.000 description 1
- 150000000565 5-membered heterocyclic compounds Chemical class 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910021591 Copper(I) chloride Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 229940072107 ascorbate Drugs 0.000 description 1
- KVBCYCWRDBDGBG-UHFFFAOYSA-N azane;dihydrofluoride Chemical compound [NH4+].F.[F-] KVBCYCWRDBDGBG-UHFFFAOYSA-N 0.000 description 1
- 150000003851 azoles Chemical class 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- OXBLHERUFWYNTN-UHFFFAOYSA-M copper(I) chloride Chemical group [Cu]Cl OXBLHERUFWYNTN-UHFFFAOYSA-M 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- VLFOLEXSMGRYJO-UHFFFAOYSA-L difluoroalumane Chemical compound F[AlH]F VLFOLEXSMGRYJO-UHFFFAOYSA-L 0.000 description 1
- WSLQHGMJTGELSF-UHFFFAOYSA-L dipotassium;difluoride Chemical compound [F-].[F-].[K+].[K+] WSLQHGMJTGELSF-UHFFFAOYSA-L 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 239000003002 pH adjusting agent Substances 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 235000013024 sodium fluoride Nutrition 0.000 description 1
- 239000011775 sodium fluoride Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/30604—Chemical etching
-
- C—CHEMISTRY; METALLURGY
- 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
- C23F1/02—Local etching
-
- 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
- C23F1/18—Acidic compositions for etching copper or alloys thereof
-
- 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
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/124—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/45—Ohmic electrodes
Definitions
- the present invention relates to an etchant composition and a method for forming a metal wiring and a thin film transistor substrate using the same.
- a display device such as a liquid crystal display device, a plasma display device, an electrophoretic display device, and an organic electroluminescent device has been widely used.
- the display device includes a substrate and a plurality of pixels on the substrate.
- Each pixel includes a thin film transistor connected to a gate line and a data line provided on the substrate.
- the thin film transistor receives a gate-on voltage through the gate line and an image signal through the data line.
- the gate line and the data line may be made of metal, and are patterned by a photolithography process.
- An object of the present invention is to provide an etching solution composition having a high etching rate for the metal and improved over time.
- Another object of the present invention is to provide a method for forming a metal wiring with reduced wiring defects such as disconnection.
- Etching liquid composition is 0.5% to 20% by weight persulfate, 0.01% to 1% by weight fluorine compound, 1% to about 10% by weight inorganic acid, based on the total weight of the etching liquid composition, 0.01 wt% to 2 wt% azole compound, 0.1 wt% to 5 wt% chlorine compound, 0.05 wt% to 3 wt% copper salt, 0.01 wt% to 5 wt% antioxidant, or salt of the antioxidant And water such that the total weight of the total composition is 100% by weight.
- the antioxidant or salts thereof may be ascorbic acid (Ascorbic acid), glutathione (Glutathione), lipoic acid (Lipoic acid), uric acid (Uric acid), or salts thereof.
- the persulfate is potassium persulfate (K 2 S 2 O 8 ), sodium persulfate (Na 2 S 2 O 8 ) and ammonium persulfate ((NH 4 ) 2 S 2 O 8 At least one selected from the group consisting of).
- the fluorine compound is hydrofluoric acid (HF), sodium fluoride (NaF), sodium fluoride (NaHF 2 ), ammonium fluoride, NH 4 F), ammonium bifluoride (NH 4 HF 2 ), ammonium fluoroborate (NH 4 BF 4 ), potassium fluoride (KF), potassium difluoride (KHF 2 ), fluoride Aluminum fluoride (AlF 3 ), hydrofluoroboric acid (HBF 4 ), lithium fluoride (LiF), potassium fluoroborate (KBF 4 ), calcium fluoride (CaF 2 ) and silicate fluoride (hexafluorosilicic acid, H 2 SiF 6 ) It may be one or more selected from the group consisting of.
- the azole compound is benzotriazole, aminotetrazole, aminotetrazole potassium salt, imidazole and pyrazole. It may be one or more selected from the group consisting of.
- the chlorine compound is hydrochloric acid (HCl), ammonium chloride (ammonium chloride, NH4Cl), potassium chloride (potassium chloride, KCl), iron chloride (iron chloride, FeCl 3 ), sodium chloride (sodium chloride, NaCl), ammonium perchlorate (NH 4 ClO 4 ), potassium perchlorate (K 4 ClO 4 ), sodium perchlorate (Na 4 ClO 4 ), and zinc chloride (ZnCl) It may be at least one selected from the group consisting of 2 ).
- the copper salt may be at least one member selected from the group consisting of copper nitrate (Cu (NO 3 ) 2 ), copper sulfate (CuSO 4 ) and copper ammonium phosphate (NH 4 CuPO 4 ). .
- the etchant composition is for etching the metal film containing the etching liquid composition
- the metal film is made of a multi-layer, titanium on the first metal film and the first metal film It may include a second metal film formed on and containing copper.
- the etchant composition is used to form a metal wiring by etching a metal film containing copper.
- a metal line including a copper layer is stacked, a photoresist pattern is formed on the metal layer, and a portion of the metal layer is etched using the photoresist pattern as a mask, followed by the photoresist pattern. It may include the step of removing.
- the metal film is etched with an etchant composition according to an embodiment of the present invention.
- a thin film transistor substrate includes a gate line and a gate electrode connected to the gate line on the substrate, the data line crossing the gate line to be insulated from the gate line, the source electrode connected to the data line, and After forming a drain electrode spaced apart from the source electrode, a pixel electrode connected to the drain electrode is formed to manufacture.
- the gate line, the gate electrode, the data line, the source electrode, and the drain electrode may be formed by a method of forming the metal wire.
- an etching solution composition having a high etching rate and improved aging even though there is less disconnection of the wiring.
- a metal wiring with reduced wiring defects such as disconnection is provided.
- the thin film transistor substrate using the metal wiring manufacturing method provides a high quality display device.
- FIGS. 1A through 1E are cross-sectional views sequentially illustrating a method of forming metal wirings using an etchant composition according to an exemplary embodiment of the present invention.
- FIG. 2 is a plan view illustrating a structure of a display device that may be manufactured using an etchant composition according to an exemplary embodiment of the present invention.
- FIG. 3 is a cross-sectional view taken along line II ′ of FIG. 2.
- 4A to 4C are plan views sequentially illustrating a process of manufacturing a thin film transistor substrate in a method of manufacturing a display device according to an exemplary embodiment of the present invention.
- 5A to 5D are cross-sectional views taken along the line II-II 'of FIGS. 4A to 4C.
- 6a to 6d are photographs of poorly soluble extracts generated as a result of etching copper with the etchant composition of Comparative Example 6.
- 9A and 9B illustrate reference etching using the etching solution compositions of Comparative Examples 6 and 1, and when the etching test was performed by adding 1,000 ppm of copper powder, CD skew according to the amount of copper was used. And a graph of the taper angle, respectively.
- 10A to 10C are graphs illustrating Cu EPD, CD-skew, and taper angles according to storage periods in the etching liquid composition according to Example 1, respectively.
- first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
- the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
- Singular expressions include plural expressions unless the context clearly indicates otherwise.
- the terms “comprise” or “have” are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.
- a part such as a layer, film, region, plate, etc. is said to be “on” another part, this includes not only when the other part is “right on” but also another part in the middle.
- a part such as a layer, film, region, plate, etc. is “below” another part, this includes not only the other part “below” but also another part in the middle.
- An etchant composition according to an embodiment of the present invention is for use in forming a metal wiring by etching a metal film laminated on a substrate, specifically, a metal film including copper.
- the metal film may be at least one of a copper film and a copper alloy film.
- the metal film may be provided as a single film, but is not limited thereto, and may be provided as a multilayer.
- the metal film may further include a thin film made of copper and another metal.
- the metal film may include a first metal film including titanium and a second metal film formed on the first metal film and including copper.
- the etchant composition according to an embodiment of the present invention includes a persulfate, a fluorine compound, an inorganic acid, an azole compound, a chlorine compound, a copper salt, and an antioxidant or a salt thereof.
- the persulfate etches a metal film containing copper or copper as the main oxidant.
- the persulfate may be contained in about 0.5% to about 20% by weight relative to the total weight of the etchant composition. If the content of the persulfate is lower than about 0.5% by weight, the etching rate may be reduced and sufficient etching may not be performed. When the c amount of the persulfate is higher than about 20% by weight, the etching rate is too fast to control the degree of etching, and thus the metal film including the copper may be overetched.
- the persulfate may include, for example, potassium persulfate (K 2 S 2 O 8 ), sodium persulfate (Na 2 S 2 O 8 ), or ammonium persulfate ((NH 4 ) 2 S 2 O 8 ) Or two or more of these.
- K 2 S 2 O 8 potassium persulfate
- Na 2 S 2 O 8 sodium persulfate
- ammonium persulfate (NH 4 ) 2 S 2 O 8 ) Or two or more of these.
- the fluorine compound etches the titanium film of the metal that may be provided in addition to copper and removes residues that may be caused by the etching.
- the fluorine compound is a compound containing fluorine (F), and is a main component for etching the titanium film when the metal film includes the titanium film.
- the fluorine compound may be contained in about 0.01% to about 1.0% by weight based on the total weight of the etchant composition.
- the content of the fluorine compound is lower than about 0.01% by weight, it is difficult to etch titanium, and when the content of the fluorine compound is higher than about 1.0% by weight, the occurrence of residues due to titanium etching increases.
- the content of the fluorine compound is higher than about 1.0% by weight, not only the titanium but also the glass substrate on which the titanium is laminated may be etched.
- the fluorine compound for example, hydrofluoric acid (HF), sodium fluoride (NaF), sodium bifluoride (NaHF 2 ), ammonium fluoride (ammonium fluoride, NH 4 F), futon Ammonium bifluoride (NH 4 HF 2 ), ammonium fluoroborate (NH 4 BF 4 ), potassium fluoride (KF), potassium bifluoride (KHF 2 ), aluminum fluoride , AlF 3 ), hydrofluoroboric acid (HBF 4 ), lithium fluoride (LiF), potassium fluoroborate (KBF 4 ), calcium fluoride (CaF 2 ) or fluorofluorosilicic acid, H 2 SiF 6 ).
- the fluorine compound may include a mixture of two or more thereof.
- the inorganic acid is an auxiliary oxidant.
- the etching rate may be controlled according to the content in the etchant composition of the inorganic acid.
- the inorganic acid may react with copper ions in the etchant composition, thereby preventing the increase of the copper ions to prevent the etching rate from decreasing.
- the inorganic acid may be contained in about 1% by weight to about 10% by weight based on the total weight of the etchant composition.
- the etching rate is reduced to reach a sufficient etching rate, and when the content of the inorganic acid is higher than about 10% by weight, cracks may be generated or the photoresist may be peeled off. Can be.
- the titanium film or the copper film under the photoresist may be excessively etched.
- the inorganic acid may include nitric acid, sulfuric acid, phosphoric acid, or perchloric acid, or may include a mixture of two or more thereof.
- the azole compound includes at least one nitrogen atom as a 5-membered heterocyclic compound.
- the azole compound controls the etching of copper in the metal film.
- an etching rate between the copper film and the titanium film may be controlled by adjusting the content of the azole compound.
- the azole compound may reduce cut dimension loss (CD loss) of the metal wiring.
- Specific examples of the azole compound may include benzotriazole, aminotetrazole, aminotetrazole potassium salt, imidazole, or pyrazole. .
- the azole compound may include a mixture of two or more of them.
- the azole compound may be contained in about 0.01% to about 2.0% by weight relative to the total weight of the etchant composition.
- the content of the azole compound is less than about 0.01% by weight based on the total weight of the etchant composition, it is difficult to control the etching rate of the copper film, and if the titanium film is added, it is difficult to control the etching rate between the copper film and the titanium film.
- the content of the azole compound is greater than about 2% by weight, the etching ability of the etchant composition is rather inhibited by the azole compound.
- the chlorine compound is used as an auxiliary oxidant for etching the metal film containing copper, and can adjust the angle of the taper of the metal film according to the content.
- the chlorine compound may induce erosion of the metal phenomenon to induce even erosion of the metal film.
- the chlorine compound may be contained in about 0.1% to about 5.0% by weight relative to the total weight of the etchant composition.
- the content of the chlorine compound is less than 0.1% by weight, the etching rate of the metal film containing copper is lowered, so that the etching profile is poor.
- the content of the chlorine compound is more than 5% by weight, overetching occurs and the metal wiring is lost. Can be.
- the chlorine compound may be a compound capable of dissociating into chlorine ions, for example, at least among hydrochloric acid (HCl), sodium chloride (NaCl), potassium chloride (KCl), iron chloride (FeCl 3 ), ammonium chloride (NH 4 Cl) One material can be used.
- HCl hydrochloric acid
- NaCl sodium chloride
- KCl potassium chloride
- FeCl 3 iron chloride
- NH 4 Cl ammonium chloride
- chloride-based compound examples include hydrochloric acid (HCl), ammonium chloride (ammonium chloride, NH 4 Cl), potassium chloride (potassium chloride, KCl), iron chloride (FeCl 3 ), sodium chloride , NaCl), ammonium perchlorate (NH 4 ClO 4 ), potassium perchlorate (K 4 ClO 4 ), sodium perchlorate (Na 4 ClO 4 ), or zinc chloride (ZnCl 2 ), etc. Can be mentioned. These can be used individually or in combination of 2 or more, respectively.
- the copper salt serves to control the CD skew, it is preferable that the etching solution is contained in 0.05 to 3% by weight relative to the total content.
- the copper salt content is less than 0.05% by weight, the variation of CD skew by the number of treatments is severely shown.
- the copper salt content is more than 3% by weight, the number of treatments is reduced by reducing the oxidizing power of the main oxidant. .
- the copper salt examples include copper nitrate (Cu (NO 3 ) 2 ), copper sulfate (CuSO 4 ), and copper ammonium phosphate (NH 4 CuPO 4 ), and the like, which may be used alone or in combination of two or more. have.
- the antioxidants or salts thereof inhibit the generation of poorly soluble precipitates.
- the insoluble precipitate is CuCl 2 which is the chlorine compounds react with the Cu 2 + ions present at the time of etching the copper film may be caused to act as a source.
- the poorly soluble precipitate may be generated by the reaction of the azole compound with Cu 2+ ions present during etching. That is, the insoluble precipitates may occur by the Cu 2 + ions and the azole-based compound that may occur during the etching process the copper salt and the copper layer forms a complex.
- ATZ represents an azole-based compound, is used as a chelating agent to form a Cu 2 + ions and complexes.
- the antioxidant of claim or their salts are reduced to Cu + 2 ions to Cu + ions, it inhibits the complex reaction.
- the antioxidants or antioxidant salts prevent additional chelating reactions with other metal ions that may occur during etching, thereby increasing the number of treatments.
- the antioxidants or salts thereof are ascorbic acid. (Ascorbic acid), glutathione (Glutathione), lipoic acid (Lipoic acid), uric acid (Uric acid), or salts thereof.
- the antioxidant or salts thereof may be ascorbic acid or ascorbate.
- the antioxidant or a salt thereof may be contained in about 0.01% to about 5% by weight based on the total weight of the etchant composition.
- the amount of the antioxidant or salt of the antioxidant is less than 0.01% by weight, the ability to inhibit the generation of poorly soluble precipitates is reduced, so that poorly soluble precipitates are generated.
- the amount of the antioxidant is more than 5% by weight, the etching rate of copper is lowered and the etching process is performed. This can take a long time, which can be a problem for productivity.
- the etchant composition may further include an additional etching control agent, a surfactant, and a pH adjusting agent in addition to the above components.
- the etchant composition may include a residual amount of water such that the total weight of the etchant composition is 100% by weight.
- the water may be deionized water.
- the etchant composition is used in a process of manufacturing an electronic device, and in detail, is used to etch a metal film laminated on a substrate during a process of manufacturing the electronic device.
- the etchant composition according to the exemplary embodiment of the present invention is particularly used to form a data line by etching a metal film made of copper during a manufacturing process of a display device.
- the use of the etchant composition is not limited thereto, and of course, it can be used when forming wirings other than data wirings, for example, gate wirings.
- the etchant composition hardly generates poorly soluble precipitates and has little change over time.
- the generation of poorly soluble precipitates during etching is reduced or prevented, not only the number of replacements of the filter in the facility for filtering the poorly soluble precipitates is reduced, but also the defects caused by the precipitates acting as foreign substances are reduced.
- FIGS. 1A through 1E are cross-sectional views sequentially illustrating a method of forming metal wires, particularly metal wires including copper, using an etchant composition according to an exemplary embodiment of the present invention.
- the etching liquid composition for etching the metal film including the first metal film including titanium and the second metal film including copper will be described as an example.
- a metal film is stacked on an insulating substrate INS.
- the metal film may be a double film in which a first metal film CL1 made of a first metal and a second metal film CL2 made of a second metal different from the first metal are sequentially stacked.
- the first metal may be titanium
- the second metal may be copper.
- the metal film is disclosed as an example of a double film, but is not limited thereto.
- the photoresist film PR is exposed through the mask MSK.
- the mask MSK includes a first region R1 that blocks all of the irradiated light and a second region R2 that transmits a part of the light and blocks a portion of the light.
- An upper surface of the insulating substrate INS is divided into regions corresponding to the first region R1 and the second region R2.
- each corresponding region of the insulating substrate INS is also a first region R1.
- a photoresist pattern having a predetermined thickness may be formed in a region where all light is blocked through the first region R1.
- the PRT remains and the photoresist is completely removed in the second region R2 through which light is transmitted, thereby exposing the surface of the insulating substrate INS.
- a positive photoresist is used to remove the photosensitive film of the exposed portion as described above, but the present invention is not limited thereto.
- the photosensitive film of the unexposed portion is removed. Negative photoresist may also be used.
- the first metal film CL1 and the second metal film CL2 formed under the photosensitive film pattern PRT are etched.
- the first metal film CL1 and the second metal film CL2 are etched, the first metal film CL1 and the second metal film CL2 are etched using the etchant composition according to the embodiment of the present invention.
- a metal wiring MW in which the first metal wiring ML1 made of the first metal and the second metal wiring ML2 made of the second metal are stacked is formed. Thereafter, as shown in FIG. 1E, the final metal wiring MW is formed by removing the remaining photoresist pattern PRT.
- a metal wire made of the first metal and the second metal that is, a titanium / copper metal wire is manufactured.
- a method of forming a metal wiring formed of a plurality of layers has been disclosed, but is not limited thereto.
- the metal wiring formed of a single layer including copper may also be manufactured in substantially the same method.
- a display device may be manufactured using the above metal wire manufacturing method. First, a structure of the display device will be described, and a method of manufacturing the display device will be described with reference to the display device. .
- FIG. 2 is a plan view illustrating a structure of a display device that may be manufactured using an etchant composition according to an exemplary embodiment of the present invention.
- 3 is a cross-sectional view taken along line II ′ of FIG. 2.
- the display device has a plurality of pixels and displays an image.
- the display device is not particularly limited, and for example, a liquid crystal display panel, an organic light emitting display panel, an electrophoretic display panel, and an electrowetting display.
- Various display panels such as an electrowetting display panel and a microelectromechanical system display panel, may be included.
- the liquid crystal display of the display device is illustrated as an example.
- each pixel has the same structure, for convenience of explanation, one pixel is shown together with the gate lines and the data lines adjacent to one of the pixels.
- the display device includes a first substrate SUB1 having a plurality of pixels PXL, a second substrate SUB2 facing the first substrate SUB1, and the second substrate.
- the liquid crystal layer LC is formed between the first substrate SUB1 and the second substrate SUB2.
- the first substrate SUB1 includes a first insulating substrate INS1, a plurality of gate lines GL and a plurality of data lines DL provided on the first insulating substrate INS1.
- the gate lines GL extend in a first direction on the first insulating substrate INS1.
- the data lines DL are formed on the gate insulating layer GI and extend in a second direction crossing the first direction.
- Each pixel PXL is connected to a corresponding one of the gate lines GL and a corresponding one of the data lines DL.
- Each pixel PXL includes a thin film transistor and a pixel electrode PE connected to the thin film transistor.
- the thin film transistor includes a gate electrode GE, a semiconductor layer SM, a source electrode SE, and a drain electrode DE.
- the gate electrode GE is provided to protrude from the gate line GL.
- the semiconductor layer SM is provided on the gate electrode GE with the gate insulating layer GI interposed therebetween.
- the semiconductor layer SM includes an active layer ACT provided on the gate insulating layer GI and an ohmic contact layer HOM provided on the active layer ACT.
- the active layer ACT is provided in a region corresponding to a region where the source electrode SE and the drain electrode DE are formed on a plane, and a region between the source electrode SE and the drain electrode DE.
- the ohmic contact layer OHM is provided between the active layer ACT and the source electrode SE and between the active layer ACT and the drain electrode DE.
- the source electrode SE is branched from the data line DL, and at least a portion of the source electrode SE overlaps with the gate electrode GE in plan view.
- the drain electrode DE is formed to be spaced apart from the source electrode SE, and in plan view, at least a portion of the drain electrode DE overlaps the gate electrode GE.
- the pixel electrode PE is connected to the drain electrode DE with a passivation layer interposed therebetween.
- the passivation layer has a contact hole exposing a part of the drain electrode DE, and the pixel electrode PE is connected to the drain electrode DE through the contact hole.
- the second substrate SUB2 is provided to face the first substrate SUB1, and is provided on the second insulating substrate INS2 and the second insulating substrate INS2 to display colors, And a black matrix BM disposed around the color filter CF to block light, and a common electrode CE to form an electric field with the pixel electrode PE.
- 4A to 4C are plan views sequentially illustrating a process of manufacturing a thin film transistor substrate in a method of manufacturing a display device according to an exemplary embodiment of the present invention.
- 5A to 5D are cross-sectional views taken along the line II-II 'of FIGS. 4A to 4C.
- FIGS. 4A to 4C and 5A to 5C a method of manufacturing a display device according to an exemplary embodiment will be described with reference to FIGS. 4A to 4C and 5A to 5C.
- a first wiring part is formed on a first insulating substrate INS1 using a first photolithography process.
- the first wiring part includes a gate line GL extending in a first direction and a gate electrode GE connected to the gate line GL.
- the first wiring part sequentially stacks a first metal and a second metal on the first insulating substrate INS1 to form a first conductive layer, and then uses the first mask (not shown) to form the first conductive layer. It is formed by etching the layer.
- the first metal may be made of titanium, and the second metal may be made of copper.
- the first metal and the second metal may be etched with the etchant composition according to the embodiment of the present invention described above. Accordingly, the gate line GL and the gate electrode GE may have a double layer structure in which the first metal and the second metal are sequentially stacked.
- a gate insulating film GI is formed on the first insulating substrate INS1 on which the first wiring part is formed, and the gate insulating film GI is formed using a second photolithography process.
- the semiconductor pattern and the second wiring portion are formed on the first insulating substrate INS1.
- the second wiring portion may be spaced apart from the data line DL extending in the second direction crossing the first direction, the source electrode SE extending from the data line DL, and the source electrode SE.
- the drain electrode DE is included.
- the gate insulating layer GI is formed by stacking a first insulating material on the first insulating substrate INS1 on which the first wiring part is formed.
- the semiconductor pattern and the second wiring part sequentially form a first semiconductor material, a second semiconductor material, and first and second metals on the first insulating substrate INS1, and form a second mask (not shown). And selectively etch the first semiconductor material, the second semiconductor material, and the first and second metal, respectively.
- the first metal may be made of titanium, and the second metal may be made of copper.
- the first metal and the second metal may be etched with the etchant composition according to the embodiment of the present invention described above. Accordingly, the data line DL, the source electrode SE, and the drain electrode DE may have a double layer structure in which the first metal and the second metal are sequentially stacked.
- the second mask may be a slit mask or a diffraction mask.
- the pixel electrode PE is formed on the first insulating substrate INS1 on which the second wiring part is formed by using third and fourth photolithography processes.
- a passivation layer PSV having a contact hole CH exposing a part of the drain electrode DE is formed on the first insulating substrate INS1 on which the second wiring part is formed.
- the passivation layer PSV is formed by stacking a second insulating material layer (not shown) and a photoresist film (not shown) on the first insulating substrate INS1 on which the second wiring part is formed. After exposure and development to form a photoresist pattern (not shown), it may be formed by removing a portion of the second insulating material layer using the photoresist pattern as a mask.
- a pixel electrode PE is formed on the passivation layer PSV and connected to the drain electrode DE through the contact hole CH using a fourth photolithography process.
- the pixel electrode PE sequentially laminates a transparent conductive material layer (not shown) and a photoresist film (not shown) on the first insulating substrate INS1 on which the passivation layer PSV is formed, and exposes and develops the photoresist film.
- the transparent conductive material layer is patterned using the photoresist pattern as a mask.
- the thin film transistor substrate manufactured by the above method that is, the first substrate SUB1 is bonded to face the second substrate SUB2 on which the color filter layer is formed.
- the liquid crystal layer LC is formed between the first substrate SUB1 and the second substrate SUB2.
- the present embodiment can fabricate a thin film transistor substrate through a photolithography process.
- metal wirings may be formed using the etchant composition according to the embodiment of the present invention.
- the forming of the metal wires using the etchant composition is not limited thereto, and only when the second wiring part is formed using the second mask, the etchant composition may be used or the first mask may be formed using the first mask. Only when forming one wiring part, the said etching liquid composition can be used. Alternatively, the etchant composition may be used when forming wirings other than the first and second wiring units.
- the etchant compositions according to Examples 1 to 3 and the other etchant compositions of Comparative Examples 1 to 6 were prepared as shown in Table 1 below.
- the unit which shows content of each component in Table 1 represents the weight% which makes 100% of the total weight of an etching liquid composition.
- Example 1 Persulfate (wt%) Inorganic acid (wt%) Fluorine compound (wt%) Azole compound (wt%) Ascorbic acid (wt%) Chlorine Compound (wt%) Copper salt (wt%) Acetic acid (wt%) water
- Example 1 10 3 0.5 1.2 0.5 1.5 0.19 0 Remaining amount
- Example 2 10 3 0.5 1.2 One 1.5 0.19 0 Remaining amount
- Example 3 10 3 0.5 1.2 5 1.5 0.19 0 Remaining amount Comparative Example 1 10 3 0.5 1.2 0 1.5 0.19 0 Remaining amount Comparative Example 2 10 3 0.5 1.2 0 0 0.19 0 Remaining amount Comparative Example 3 10 3 0.5 1.2 0 1.5 0.19 0 Remaining amount Comparative Example 4 10 3 0.5 0 0 1.5 0.19 0 Remaining amount Comparative Example 5 10 3 0.5 1.5 0.5 1.5 0.19 3 Remaining amount Comparative Example 6 10 3 0.5 1.5 0 1.5 0.19 3 Remaining amount
- samples including a titanium film, a copper film and a photoresist pattern sequentially stacked on a glass substrate were prepared.
- Each sample was sprayed with the etchant compositions of Examples 1 to 3 and Comparative Examples 1 to 6 to measure the etch rate for each sample, and the CD skew and taper angles were measured using scanning electron micrographs.
- the etching liquid compositions of Examples 1 to 3 and Comparative Examples 1 to 6 of Table 1 were prepared, and the amount of precipitates generated per weight of the etching solution after storage at about 2 ° C. for a period of time was measured.
- Table 2 shows the evaluation of the etch ratio (E / R), CD skew, taper angle, and amount of precipitates of the etchant compositions of Examples 1 to 3 and Comparative Examples 1 to 6.
- the copper etching rate is 200 ⁇ / sec or more and 300 ⁇ / sec or less
- CD Skew (one side) was 1.5 micrometers or more and 1.7 micrometers or less
- the taper angle showed very excellent 60-70 degrees.
- the etching rate of copper was 200 mW / sec or more and 300 mW / sec or less
- CD skew (one side) was 1.8 ⁇ m
- the taper angle was excellently in the range of 30 ° to 60 °. appear.
- the etchant according to Example 3 and Comparative Examples 3 and 4 the etching characteristics were poor.
- Comparative Examples 2, 3, and 4 did not contain antioxidants or antioxidant salts, but did not contain copper salts, chlorine compounds, or azole compounds that caused poorly soluble precipitates. There was no occurrence.
- Comparative Example 5 in which acetic acid, a kind of organic acid, was included in the same composition as in Example 1, poorly soluble precipitates were generated due to deterioration of antioxidant performance by acetic acid.
- Table 3 measures the amount of precipitation of poorly soluble precipitate when the concentration of ascorbic acid was added to the etching solution composition of Comparative Example 6 as an antioxidant.
- the precipitation amount of the poorly soluble precipitate was measured by the following method. First, the copper was etched for 5 minutes by attaching a paper filter to one side of the etching chamber and mixing 4000 ppm of copper per 3 kg of the etchant composition of Comparative Example 6 with the etchant composition to form an etching condition by copper. Then, the paper filter was collected, dried for 24 hours, washed with deionized water, naturally dried for 24 hours, and weighed to subtract the weight of the initial paper filter.
- the amount of mixed copper of copper per 3kg of the etchant composition was changed to 0ppm, 2000ppm, 4000ppm, and 6000ppm and added at a constant time at 2 ° C. Stored.
- 6A to 6D and 7A to 7D are photographs of poorly soluble extracts generated in the etchant compositions of Comparative Example 6 and Example 1, respectively.
- the amount of poorly soluble precipitates generated according to the amount of copper is summarized in Table 4 below.
- Table 7 shows a reference test result by performing a reference etch using the etchant composition of Example 1 and adding an etching test by adding 1,000 ppm of copper powder.
- Cu EPD represents an end point detect (second) when etching is completed to a predetermined degree when patterning copper with the etchant composition in a photolithography process.
- Example 1 there is no sparingly soluble precipitate even if the storage period is increased.
- Comparative Example 6 it can be seen that the amount of poorly soluble precipitate continuously increases as the storage day increases.
- 9A and 9B illustrate a CD skew according to copper content when a reference etch was performed using the etchant compositions of Comparative Examples 6 and 1 and the etching test was performed by adding 1,000 ppm of copper powder.
- Example 1 of the present invention After the etching solution composition of Example 1 of the present invention was stored at about 10 ° C. for a period of time, the etching solution composition was subjected to an etching test again under the same conditions every day, and compared with the reference test results, and the results are shown in Table 9 below. In summary.
- 10A to 10C are graphs showing Cu EPD, CD-skew, and taper angles according to storage periods in the etching liquid composition according to Example 1, respectively.
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Abstract
Description
과황산염(wt%) | 무기산(wt%) | 불소계 화합물(wt%) | 아졸계 화합물(wt%) | 아스코르브산(wt%) | 염소계 화합물(wt%) | 구리염(wt%) | 초산(wt%) | 물 | |
실시예1 | 10 | 3 | 0.5 | 1.2 | 0.5 | 1.5 | 0.19 | 0 | 잔량 |
실시예2 | 10 | 3 | 0.5 | 1.2 | 1 | 1.5 | 0.19 | 0 | 잔량 |
실시예3 | 10 | 3 | 0.5 | 1.2 | 5 | 1.5 | 0.19 | 0 | 잔량 |
비교예1 | 10 | 3 | 0.5 | 1.2 | 0 | 1.5 | 0.19 | 0 | 잔량 |
비교예2 | 10 | 3 | 0.5 | 1.2 | 0 | 0 | 0.19 | 0 | 잔량 |
비교예3 | 10 | 3 | 0.5 | 1.2 | 0 | 1.5 | 0 | 0 | 잔량 |
비교예4 | 10 | 3 | 0.5 | 0 | 0 | 1.5 | 0.19 | 0 | 잔량 |
비교예 5 | 10 | 3 | 0.5 | 1.5 | 0.5 | 1.5 | 0.19 | 3 | 잔량 |
비교예 6 | 10 | 3 | 0.5 | 1.5 | 0 | 1.5 | 0.19 | 3 | 잔량 |
식각특성 | 석출물 | ||||
Cu E/R | CD-Skew(편측) | 테이퍼 각도 | 비고 | ||
실시예1 | 250 | 1.666 | 65 | 매우 우수 | 매우 우수 |
실시예2 | 227 | 1.534 | 65 | 매우 우수 | 매우 우수 |
실시예3 | 139 | 0.758 | 72 | 불량 | 매우 우수 |
비교예1 | 277 | 1.734 | 57 | 우수 | 매우 불량 |
비교예2 | 250 | 1.664 | 61 | 매우 우수 | 매우 우수 |
비교예3 | 200 | 1.901 | 22 | 불량 | 매우 우수 |
비교예4 | 263 | 1.09 | 70 | 불량 | 매우 우수 |
비교예 5 | 250 | 1.664 | 60 | 매우 우수 | 매우 불량 |
비교예 6 | 252 | 1.651 | 65 | 매우 우수 | 매우 불량 |
조건 | 비교예 6 | 비교예 6 + 아스코르브산 0.3wt% | 비교예 6 + 아스코르브산 0.5wt% | 비교예 6 + 아스코르브산 0.7wt% | 비교예 6 + 아스코르브산 1.0wt% |
석출량 | 0.03g | 0.0289g | -0.0037g | 0.0031g | 0.0003g |
식각된 구리양 | 비교예 6 | 실시예 1 |
0ppm | 1.2451 g | 0.0000 g |
2000ppm | 15.6915 g | 0.0000 g |
4000ppm | 9.0322 g | 0.0000 g |
6000ppm | 2.2486 g | 0.0000 g |
원소 | 원소 함량(wt%) | 원소 함량(at%) |
C | 05.59 | 10.97 |
N | 14.92 | 25.11 |
O | 16.06 | 23.66 |
Na | 10.25 | 10.51 |
S | 12.86 | 09.45 |
Cl | 18.22 | 12.11 |
Cu | 22.09 | 08.19 |
원소 | 원소 함량(wt%) | 원소 함량(at%) |
C | 33.91 | 45.76 |
O | 45.89 | 46.50 |
Na | 05.25 | 03.70 |
Pt | 08.33 | 00.69 |
S | 06.61 | 03.34 |
Ref | 1000ppm | 2000ppm | 3000ppm | 4000ppm | |
Cu EPD | ◎ | ◎ | ◎ | ◎ | ◎ |
CD-Skew(편측) | ◎ | ◎ | ◎ | ◎ | ◎ |
테이퍼 각도 | ◎ | ◎ | ◎ | ◎ | ◎ |
2일 | 4일 | 6일 | 8일 | 10일 | |
비교예 6 | 0.3140g | 1.2836g | 1.9855g | 3.2648g | 3.4412g |
실시예 1 | 0g | 0g | 0g | 0g | 0g |
실시예1 | Ref | 1일 | 2일 | 3일 |
Cu EPD | ◎ | ◎ | ◎ | ◎ |
CD-Skew(편측) | ◎ | ◎ | ◎ | ◎ |
테이퍼 각도 | ◎ | ◎ | ◎ | ◎ |
Claims (20)
- 식각액 조성물 총 중량에 대하여 0.5중량% 내지 20중량%의 과황산염, 0.01중량% 내지 1중량%의 불소 화합물, 1중량% 내지 약 10중량%의 무기산, 0.01중량% 내지 2중량%의 아졸계 화합물, 0.1중량% 내지 5중량%의 염소 화합물, 0.05중량% 내지 3중량%의 구리염, 0.01중량% 내지 5중량%의 항산화제 또는 그의 염, 및 전체 조성물의 총 중량이 100중량%가 되도록 하는 물을 포함하는 식각액 조성물.
- 제1항에 있어서,상기 항산화제 또는 그의 염은 아스코르브산(Ascorbic acid), 글루타티온(Glutathione), 리포산(Lipoic acid), 요산(Uric acid), 또는 이들의 염인 식각액 조성물.
- 제2항에 있어서,상기 과황산염은 과황산포타슘(K2S2O8), 과황산소듐(Na2S2O8) 및 과황산암모늄((NH4)2S2O8)으로 이루어진 군으로부터 선택되는 적어도 한 종 이상인 식각액 조성물.
- 제2항에 있어서,상기 불소 화합물은 불화수소산(hydrofluoric acid, HF), 불화소듐(sodium fluoride, NaF), 이불화소듐(sodium bifluoride, NaHF2), 불화암모늄(ammonium fluoride, NH4F), 이불화암모늄 (ammonium bifluoride, NH4HF2), 붕불화암모늄(ammonium fluoroborate, NH4BF4), 불화포타슘(potassium fluoride, KF), 이불화포타슘(potassium bifluoride, KHF2), 불화알루미늄(aluminium fluoride, AlF3), 붕불산(hydrofluoroboric acid, HBF4), 불화리튬(lithium fluoride, LiF), 불화붕산 포타슘(potassium fluoroborate, KBF4), 불화칼슘(calcium fluoride, CaF2) 및 불화규산(hexafluorosilicic acid, H2SiF6)으로 이루어진 군으로부터 선택되는 1종 이상인 식각액 조성물.
- 제2항에 있어서,상기 아졸계화합물은 벤조트리아졸(benzotriazole), 아미노테트라졸(aminotetrazole), 아미노테트라졸 포타슘염(aminotetrazole potassium salt), 이미다졸(imidazole) 및 피라졸(pyrazole)로 이루어진 군으로부터 선택되는 1종 이상인 식각액 조성물.
- 제2항에 있어서,상기 염소 화합물은 염산(hydrochloric acid, HCl), 염화암모늄(ammonium chloride,NH4Cl), 염화포타슘(potassium chloride, KCl), 염화철(iron chloride, FeCl3), 염화소듐(sodium chloride, NaCl), 과염소산암모늄(ammonium perchlorate, NH4ClO4), 과염소산포타슘(potassium perchlorate, K4ClO4), 과염소산소듐(sodium perchlorate, Na4ClO4) 및 염화 아연(zinc chloride, ZnCl2)로 이루어진 군으로부터 선택되는 1종 이상인 식각액 조성물.
- 제2항에 있어서,상기 구리염은 질산구리(Cu(NO3)2), 황산구리(CuSO4) 및 인산구리암모늄(NH4CuPO4)로 이루어진 군으로부터 선택되는 1종 이상인 식각액 조성물.
- 제2항에 있어서,상기 식각액 조성물은 구리를 포함하는 금속막을 식각하는 식각액 조성물.
- 제8항에 있어서,상기 금속막은 다중막으로 이루어지며, 티타늄을 제1 금속막 및 상기 제1 금속막 상에 형성되며 구리를 포함하는 제2 금속막을 포함하는 식각액 조성물.
- 구리를 포함하는 금속막을 적층하는 단계;상기 금속막 상에 감광막 패턴을 형성하고, 상기 감광막 패턴을 마스크로 하여 식각액 조성물로 상기 금속막의 일부를 식각하는 단계; 및상기 감광막 패턴을 제거하는 단계를 포함하고,상기 식각액 조성물은 식각액 조성물 총 중량에 대하여 0.5중량% 내지 20중량%의 과황산염, 0.01중량% 내지 1중량%의 불소 화합물, 0.01중량% 내지 2중량%의 아졸계 화합물, 0.1중량% 내지 5중량%의 염소 화합물, 0.05중량% 내지 3중량%의 구리염, 0.01중량% 내지 5중량%의 항산화제 또는 그의 염, 및 전체 조성물의 총 중량이 100중량%가 되도록 하는 물을 포함하는 금속 배선 형성 방법.
- 제10항에 있어서,상기 항산화제 또는 그의 염은 아스코르브산(Ascorbic acid), 글루타티온(Glutathione), 리포산(Lipoic acid), 요산(Uric acid), 또는 이들의 염인 금속 배선 형성 방법.
- 제11항에 있어서,상기 금속막은 티타늄을 포함하는 제1 금속막과 상기 제1 금속막 상에 구비되며 상기 구리를 포함하는 제2 금속막을 포함하는 것을 특징으로 하는 금속 배선 형성 방법.
- 제11항에 있어서,상기 과황산염은 과황산포타슘(K2S2O8), 과황산소듐(Na2S2O8) 및 과황산암모늄((NH4)2S2O8)으로 이루어진 군으로부터 선택되는 적어도 한 종 이상인 금속 배선 형성 방법.
- 제11항에 있어서,상기 불소 화합물은 불화수소산(hydrofluoric acid, HF), 불화소듐(sodium fluoride, NaF), 이불화소듐(sodium bifluoride, NaHF2), 불화암모늄(ammonium fluoride, NH4F), 이불화암모늄 (ammonium bifluoride, NH4HF2), 붕불화암모늄(ammonium fluoroborate, NH4BF4), 불화포타슘(potassium fluoride, KF), 이불화포타슘(potassium bifluoride, KHF2), 불화알루미늄(aluminium fluoride, AlF3), 붕불산(hydrofluoroboric acid, HBF4), 불화리튬(lithium fluoride, LiF), 불화붕산 포타슘(potassium fluoroborate, KBF4), 불화칼슘(calcium fluoride, CaF2) 및 불화규산(hexafluorosilicic acid, H2SiF6)으로 이루어진 군으로부터 선택되는 1종 이상인 금속 배선 형성 방법.
- 제11항에 있어서,상기 아졸계화합물은 벤조트리아졸(benzotriazole), 아미노테트라졸(aminotetrazole), 아미노테트라졸 포타슘염(aminotetrazole potassium salt), 이미다졸(imidazole) 및 피라졸(pyrazole)로 이루어진 군으로부터 선택되는 1종 이상인 금속 배선 형성 방법.
- 제11항에 있어서,상기 염소 화합물은 염산(hydrochloric acid, HCl), 염화암모늄(ammonium chloride,NH4Cl), 염화포타슘(potassium chloride, KCl), 염화철(iron chloride, FeCl3), 염화소듐(sodium chloride, NaCl), 과염소산암모늄(ammonium perchlorate, NH4ClO4), 과염소산포타슘(potassium perchlorate, K4ClO4), 과염소산소듐(sodium perchlorate, Na4ClO4) 및 염화 아연(zinc chloride, ZnCl2)로 이루어진 군으로부터 선택되는 1종 이상인 금속 배선 형성 방법.
- 제11항에 있어서,상기 구리염은 질산구리(Cu(NO3)2), 황산구리(CuSO4) 및 인산구리암모늄(NH4CuPO4)로 이루어진 군으로부터 선택되는 1종 이상인 금속 배선 형성 방법.
- 기판 상에 게이트 라인 및 상기 게이트 라인에 연결된 게이트 전극을 형성하는 단계;상기 게이트 라인과 절연되게 교차하는 데이터 라인과, 상기 데이터 라인에 연결된 소스 전극, 상기 소스 전극으로부터 이격된 드레인 전극을 형성하는 단계; 및상기 드레인 전극에 연결된 화소 전극을 형성하는 단계를 포함하며,상기 데이터 라인, 상기 소스 전극, 및 상기 드레인 전극을 형성하는 단계는,구리를 포함하는 금속막을 적층하는 단계;상기 금속막 상에 감광막 패턴을 형성하고, 상기 감광막 패턴을 마스크로 하여 식각액 조성물로 상기 금속막의 일부를 식각하는 단계; 및상기 감광막 패턴을 제거하는 단계를 포함하고,상기 식각액 조성물은 식각액 조성물 총 중량에 대하여 0.5중량% 내지 20중량%의 과황산염, 0.01중량% 내지 1중량%의 불소 화합물, 0.01중량% 내지 2중량%의 아졸계 화합물, 0.1중량% 내지 5중량%의 염소 화합물, 0.05중량% 내지 3중량%의 구리염, 0.01중량% 내지 5중량%의 항산화제 또는 그의 염, 및 전체 조성물의 총 중량이 100중량%가 되도록 하는 물을 포함하는 박막 트랜지스터 기판 형성 방법.
- 제18항에 있어서,상기 항산화제 또는 이들의 염은 아스코르브산(Ascorbic acid), 글루타티온(Glutathione), 리포산(Lipoic acid), 요산(Uric acid), 또는 이들의 염염인 박막 트랜지스터 기판 형성 방법.
- 제19항에 있어서,상기 금속막은 티타늄을 포함하는 제1 금속막과 상기 제1 금속막 상에 구비되며 상기 구리를 포함하는 제2 금속막을 포함하는 것을 특징으로 하는 박막 트랜지스터 기판 형성 방법.
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