WO2006103751A1 - 銅エッチング液及びエッチング方法 - Google Patents
銅エッチング液及びエッチング方法 Download PDFInfo
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- WO2006103751A1 WO2006103751A1 PCT/JP2005/005976 JP2005005976W WO2006103751A1 WO 2006103751 A1 WO2006103751 A1 WO 2006103751A1 JP 2005005976 W JP2005005976 W JP 2005005976W WO 2006103751 A1 WO2006103751 A1 WO 2006103751A1
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- WIPO (PCT)
- Prior art keywords
- copper
- etching
- etching solution
- surfactant
- group
- Prior art date
Links
- 238000005530 etching Methods 0.000 title claims abstract description 184
- 239000010949 copper Substances 0.000 title claims abstract description 105
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims description 41
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229910000881 Cu alloy Inorganic materials 0.000 claims abstract description 43
- 229910052751 metal Inorganic materials 0.000 claims abstract description 40
- 239000002184 metal Substances 0.000 claims abstract description 40
- 239000004094 surface-active agent Substances 0.000 claims abstract description 31
- VBIXEXWLHSRNKB-UHFFFAOYSA-N ammonium oxalate Chemical compound [NH4+].[NH4+].[O-]C(=O)C([O-])=O VBIXEXWLHSRNKB-UHFFFAOYSA-N 0.000 claims abstract description 21
- -1 Nikkenore Chemical compound 0.000 claims description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 16
- 150000001413 amino acids Chemical class 0.000 claims description 16
- 239000011135 tin Substances 0.000 claims description 14
- 150000002739 metals Chemical class 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 claims description 10
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 10
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 10
- 229910052718 tin Inorganic materials 0.000 claims description 10
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 9
- 239000003945 anionic surfactant Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 239000002736 nonionic surfactant Substances 0.000 claims description 9
- 229910052709 silver Inorganic materials 0.000 claims description 9
- 239000004332 silver Substances 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 239000004480 active ingredient Substances 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 239000011133 lead Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000010936 titanium Substances 0.000 claims description 6
- 239000004471 Glycine Substances 0.000 claims description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 5
- 229910052737 gold Inorganic materials 0.000 claims description 5
- 239000010931 gold Substances 0.000 claims description 5
- 229910052763 palladium Inorganic materials 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 229910052783 alkali metal Inorganic materials 0.000 claims description 3
- 150000001340 alkali metals Chemical class 0.000 claims description 3
- 150000005215 alkyl ethers Chemical class 0.000 claims description 3
- 125000000524 functional group Chemical group 0.000 claims description 3
- 125000005702 oxyalkylene group Chemical group 0.000 claims description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 claims 1
- 150000002978 peroxides Chemical class 0.000 claims 1
- 239000000758 substrate Substances 0.000 abstract description 24
- 239000007800 oxidant agent Substances 0.000 abstract description 4
- 230000001590 oxidative effect Effects 0.000 abstract description 3
- 239000008139 complexing agent Substances 0.000 abstract description 2
- 150000004699 copper complex Chemical class 0.000 abstract description 2
- 238000009736 wetting Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 80
- 239000010409 thin film Substances 0.000 description 18
- 239000004065 semiconductor Substances 0.000 description 9
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 238000004090 dissolution Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000001039 wet etching Methods 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 5
- 239000010408 film Substances 0.000 description 5
- 239000010419 fine particle Substances 0.000 description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 235000014113 dietary fatty acids Nutrition 0.000 description 4
- 229930195729 fatty acid Natural products 0.000 description 4
- 239000000194 fatty acid Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 125000000217 alkyl group Chemical group 0.000 description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 description 3
- 239000002280 amphoteric surfactant Substances 0.000 description 3
- 238000005202 decontamination Methods 0.000 description 3
- 230000003588 decontaminative effect Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000059 patterning Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 2
- 238000001312 dry etching Methods 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 125000006353 oxyethylene group Chemical group 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- 229920002120 photoresistant polymer Polymers 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 239000002952 polymeric resin Substances 0.000 description 2
- 229920002503 polyoxyethylene-polyoxypropylene Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 150000005846 sugar alcohols Polymers 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- KWIUHFFTVRNATP-UHFFFAOYSA-N Betaine Natural products C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerol Natural products OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical compound C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229920001214 Polysorbate 60 Polymers 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000004996 alkyl benzenes Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000006229 amino acid addition Effects 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229960003237 betaine Drugs 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- QOSATHPSBFQAML-UHFFFAOYSA-N hydrogen peroxide;hydrate Chemical compound O.OO QOSATHPSBFQAML-UHFFFAOYSA-N 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000000992 sputter etching Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/32—Alkaline compositions
- C23F1/34—Alkaline compositions for etching copper or alloys thereof
-
- 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
Definitions
- the present invention relates to an etching solution for selectively etching copper or a copper alloy by a wet etching method, and a method for etching copper or a copper alloy using this etching solution. More specifically, the present invention relates to a copper etching solution and an etching method suitable for etching of a semiconductor device such as a semiconductor device or a liquid crystal display device, copper or a copper alloy thin film in manufacturing a printed circuit board, an IC card, or the like.
- Semiconductor devices such as semiconductor devices and liquid crystal display devices, printed circuit boards, IC cards, and the like generally form metal thin film elements and electrode wiring elements by patterning metal thin films on the substrate. Manufactured.
- a photoresist pattern formed on the surface of the metal thin film by a photolithography technique is used as a mask, or by etching with a chemical.
- Examples include a wet etching method that performs pattern force check and a dry etching method such as ion etching or plasma etching.
- the wet etching method is economically advantageous because it does not require an expensive apparatus and uses a relatively inexpensive chemical compared to the dry etching method.
- uniform etching can be performed. It has the advantage that it can be applied to those with a three-dimensional structure that is not easily affected by the shape. For this reason, at present, the wet etching method is frequently used as a method of manufacturing a thin film pattern.
- an etching solution used when patterning a device or the like using copper or a copper alloy generally, an alkaline etching solution such as amine or ammonia water, an aqueous solution of ferric chloride, a second solution of chloride.
- An aqueous solution of dicopper, an aqueous solution of persulfate, and an acidic etching solution in which sulfuric acid and hydrogen peroxide are mixed have been used (for example, patent documents:! To 5).
- etching solution not only the uniform etching property of copper or copper alloy but also the selection of copper or copper alloy is used as the etching solution.
- Etchability is required. That is, when creating an element using copper or a copper alloy, for example, on an insulating substrate made of an organic material such as silicon, glass, alumina, or a polymer resin, copper or a copper alloy such as Nikkenore or a nickel alloy is used. A laminated film in which copper or a copper alloy is laminated is formed through a metal thin film other than the above.
- Patent Document 1 Japanese Patent Laid-Open No. 2002-266087
- Patent Document 2 Japanese Patent Laid-Open No. 10-96088
- Patent Document 3 JP-A-8-60386
- Patent Document 4 Japanese Patent Laid-Open No. 2002-348685
- Patent Document 5 Japanese Unexamined Patent Publication No. 2000-248386
- etching solutions for copper or copper alloys for example, acidic etching solutions containing acids such as sulfuric acid and hydrogen peroxide water, etc.
- these etchants contain water as the main component. Therefore, sufficient wettability with copper or copper alloy is not obtained. For this reason, etching delays and etching residues are likely to occur in microfabrication.
- the conventional etching solution has a low etching selectivity for etching only copper or a copper alloy without etching other metals in a system in which other metals coexist. For these reasons, it has been difficult to selectively and uniformly etch copper or copper alloys when forming fine elements using copper or copper alloys.
- the present invention solves the above-mentioned conventional problems, and can etch copper or copper alloy selectively and uniformly even when other metals coexist, etching solution for copper or copper alloy And an etching method of copper or a copper alloy using the etching solution.
- the copper etching solution of the present invention is an etching solution for etching copper or a copper alloy, contains at least ammonium oxalate, hydrogen peroxide, and a surfactant, and has a surface tension of 45 mNZm or less.
- the pH is 6.0 to 8.5.
- ammonium oxalate and hydrogen peroxide and an effective amount for reducing the surface tension of the etching solution to 45 mN / m or less.
- An etchant with a specific pH containing one or more surfactants contains other metals having good conductivity, particularly aluminum, titanium, nickel, tin, lead, silver, gold, palladium, or one or more of these metals. Even in the case of a fine device structure in which the main component alloy coexists, it has been found that only copper or copper alloy can be selectively and uniformly etched, and the present invention has been completed.
- the copper etching solution of the present invention preferably further contains 0.2 to 25% by weight of an amino acid.
- an amino acid glycine is preferable.
- SO M group As the surfactant, SO M group, OSO M group, and COO
- Nonionic surfactants having [0014]
- the content of each component in the etching solution of the present invention is as follows: ammonium oxalate is 0.05 to 5% by weight, hydrogen peroxide is 0.2 to 10% by weight, and the surfactant is 0.000 :! It is preferably ⁇ 5% by weight.
- a metal having good conductivity for wiring or electrodes in particular, anoleminium, titanium, nickel, tin, lead, silver, gold, palladium, and one or more of these metals Copper or a copper alloy can be etched uniformly and selectively in the presence of a metal selected from the group consisting of alloys containing as a main component.
- This etchant is preferably used at a temperature of 20 to 50 ° C.
- the copper etching solution of the present invention is prepared by mixing an active ingredient containing at least ammonium oxalate, hydrogen peroxide, and a surfactant with water and preparing a prepared copper etching solution other than hydrogen peroxide. It is preferable that the mixture is prepared by mixing the active ingredient and water and then adding hydrogen peroxide to the mixture.
- the etching method of the present invention is a method of selectively etching copper or a copper alloy in the presence of a metal having good conductivity for wiring or an electrode, It can be used to etch copper or copper alloy uniformly and selectively.
- the invention's effect is a method of selectively etching copper or a copper alloy in the presence of a metal having good conductivity for wiring or an electrode, It can be used to etch copper or copper alloy uniformly and selectively.
- the copper etching solution and etching method of the present invention copper or a copper alloy and other highly conductive metals associated with the manufacture of electrodes, wirings, or bumps of thin film transistors of semiconductor devices and liquid crystal display devices, etc.
- the substrate having the laminated structure it is possible to selectively etch uniform copper or copper alloy with no residue in the fine parts that corrode the electronic members and various laminated films on the substrate.
- selective high precision etching with much higher dimensional controllability than conventional methods is achieved, and the electrical and operational characteristics of the device are improved, thereby improving the performance of various devices such as semiconductor elements. Can be achieved.
- the etching target of the copper etching solution of the present invention is not limited to pure copper, but is a copper alloy. Also good. A copper alloy with a copper content of 50% by weight or more is suitable, and there are no particular restrictions on the alloyed metal in the copper alloy. For example, one type of tin, lead, zinc, nickel, manganese, etc. Or two or more.
- the copper etching solution of the present invention is usually prepared as an aqueous solution containing ammonium oxalate, hydrogen peroxide, a surfactant and water, and optionally an amino acid.
- Ammonium oxalate functions as a complexing agent for dissolving copper as a copper complex, and the concentration in the etching solution is 0.05 to 5% by weight, particularly 1.5 to 4% by weight. preferable. If the concentration of ammonium oxalate is too low, the copper etching becomes non-uniform and a long etching time may be required. Conversely, if the ammonium oxalate concentration is too high, ammonium oxalate can be deposited in the etching apparatus due to the solubility of ammonium oxalate.
- Hydrogen peroxide functions as an oxidizing agent for oxidizing the copper surface, and its concentration is preferably 0.2 to 10% by weight, and particularly preferably 0.5 to 5% by weight. If the concentration of hydrogen peroxide is too low, copper etching may take a long time. On the other hand, if the hydrogen peroxide concentration is too high, there may be problems in terms of safety, such as when the hydrogen peroxide decomposes, there is a rapid exotherm of the etching solution and a large amount of oxygen. Accordingly, hydrogen peroxide is preferably added at the end after mixing other active ingredients and water when preparing the copper etching solution of the present invention.
- concentrations of ammonium oxalate and hydrogen peroxide in the etching solution may be determined by appropriately adjusting the required etching rate within the above range.
- the surface tension of the etching solution is reduced to 45 mNZm or less, whereby the wettability to the substrate surface and the etching solution for the high aspect portion in the substrate structure are reduced.
- the surfactant include an anionic surfactant, a cationic surfactant, an amphoteric surfactant, and a nonionic surfactant.
- anionic, amphoteric and nonionic surfactants are preferred, and anionic and nonionic surfactants are particularly preferred.
- These surfactants may be used singly or in appropriate combination of two or more different types. Above all, the combination of anionic surfactants and nonionic surfactants is It is preferable from the viewpoint of the improvement of the permeability of the chant, the low bubble property, and the decontamination effect.
- anionic surfactant examples include a carboxylic acid type, a sulfonic acid type, a sulfate ester type, and a phosphate ester type.
- amphoteric surfactant examples include an amino acid type and a betaine type. Polyethylene glycol type, polyhydric alcohol type and the like.
- anionic surfactants sulfonic acid type (having one SO-group), sulfuric acid ester
- alkyl sulfonic acids alkyl benzene sulfonic acids, alkyl sulfate esters, alkyl ether sulfates, alkyl carboxylic acids, and salts thereof are preferably used.
- nonionic surfactants polyoxyethylene alkylphenyl ethers, polyoxyethylene fatty acid esters, polyoxyethylene sorbitan fatty acid esters and the like are listed as polyethylene glycol types.
- examples of the polyalkylene glycol type include polyoxyethylene polyoxypropylene ether, polyoxyethylene polyoxybutylene ether, and polyoxyethylene polyoxypropylene alkyl ether.
- examples of the polyhydric alcohol type include glycerin fatty acid ester and sorbitan fatty acid ester.
- polyoxyalkylene (alkyl) ethers are preferably used because they are excellent in chemical stability and decontamination property and are excellent in low foaming property.
- the surfactant concentration in the copper etching solution is preferably from 0.000 to 5% by weight, particularly preferably from 0.001 to 5% by weight. If the surfactant concentration is too low, the penetration of the etching solution by the surfactant and various particle decontamination performances will not be sufficient, and if it is too high, foaming will be noticeable and may not be suitable depending on the etching method. The load when processing the waste liquid may increase.
- the copper etching solution of the present invention is characterized by having a surface tension force of S45 mN / m or less. Thus, sufficient surface wettability is ensured by the small surface tension. .
- the copper etching solution of the present invention may further contain an amino acid such as glycine.
- an amino acid such as glycine.
- the content of the amino acid in the copper etching solution is preferably about 0.2 to 25% by weight, particularly about 1 to about 15% by weight.
- the pH of the copper etching solution of the present invention is 6.0 to 8.5, preferably 6.5 to 8. If the pH of the copper etchant is too low or too high, etching selectivity with coexisting metals may be reduced.
- the pH of the copper etchant can be adjusted using acid and alkali components as necessary.
- the acid component used include organic acids such as acetic acid, and inorganic acids such as hydrochloric acid and nitric acid.
- ammonia water, sodium hydroxide, potassium hydroxide aqueous solution and the like can be used as the alkaline component.
- aqueous ammonia is preferably used as the alkaline component.
- the pH of the copper etching solution it is preferable to adjust the pH of the copper etching solution not only during preparation but also during etching. That is, the force that may cause the pH to fluctuate due to etching If the preferred pH range is escaped, the copper etching selectivity to the coexisting metal may decrease. In particular, when the pH of the copper etching solution is increased, the decomposition rate of hydrogen peroxide as an oxidizing agent is increased, and as a result, the life of the copper etching solution may be shortened.
- the copper etching solution of the present invention contain amino acids, the P H buffer action of amino acids, the variation width of the p H is reduced, since frequently it is not necessary to perform the pH adjustment, very advantageous der The
- etching is performed using such a copper etching solution of the present invention
- insoluble impurities such as fine particles
- uniform etching is performed especially as the pattern size to be etched is reduced. May interfere.
- the filtration method may be a one-pass method, but the circulation method is more preferable from the viewpoint of the fine particle removal efficiency.
- the pore size of the precision filter can be selected as appropriate, but generally it is preferably 0.2 x m or less, particularly preferably 0.1 / im or less.
- the material of the filter is arbitrary as long as it is chemically and physically stable with respect to the etching solution to be filtered, and examples thereof include fluororesin-based materials such as high-density polyethylene and polytetrafluoroethylene / ethylene oxide. . It is preferable that the copper etchant removes insoluble impurities such as fine particles by such a filtration treatment so that the number of fine particles having a diameter of 0.5 ⁇ 1000 ⁇ or more is 1000 particles / ml or less. .
- the etching method using the copper etching solution of the present invention may be performed at room temperature of about 15 to 30 ° C, but the etching solution may be heated for the purpose of improving the etching rate.
- the temperature of the etching solution is preferably 10 to 60 ° C, and more preferably 20 to 50 ° C.
- the etching method of the present invention includes, for example, aluminum, nickel, tin, lead, silver, gold, palladium, or aluminum formed on an insulating substrate made of an organic material such as silicon, glass, alumina, or a polymer resin. It is applied to the etching of copper or copper alloy thin films laminated on a highly conductive metal film such as an alloy mainly composed of one or more of these metals.
- the etching method of the present invention using the copper etching solution of the present invention is arbitrary, and may be performed using a conventionally known apparatus and apparatus used in wet etching.
- a dipping method in which an etching tank is filled with an etching solution and the etching target is immersed may be used.
- etching can be performed more uniformly by swinging the object to be etched or forcibly circulating the etching solution in the tank.
- spray method in which an etching solution is sprayed onto the surface of an etching target
- spin method in which an etching solution is discharged from a nozzle onto a rotating etching target.
- the copper or copper alloy thin film is dissolved and removed by etching, and the metal thin film or substrate under the copper or copper alloy thin film is exposed. Then, after the just etching, over-etching for further etching is performed.
- the overetching time is 5 ° /. More than 200 ° /. Below, especially 10 ° /. It is preferably 100 ° / ⁇ or less.
- the surface tension of the etching solution was measured using a surface tension meter (“CBVP SURFACE TENSIONMETER A3” manufactured by Kyowa Kagaku Co., Ltd.).
- the pH was measured using a pH meter (“D — 24” manufactured by Horiba, Ltd.).
- Example 1 except that the surfactant was not added to the etching solution, the etching solution was prepared in the same manner, and the surface tension and pH were measured in the same manner, while dissolving the metal. A speed evaluation test was conducted and the results are shown in Table 1.
- the etching solution of the present invention contains silver (Ag), nickel (Ni), tin (Sn), tin Z silver (96.5 / 3.5 wt%) alloy (Sn 'Ag) and aluminum (A1) have high etching selectivity, and can selectively etch only copper without attacking these metals. Moreover, it can be seen that the surfactant added to the etching solution does not affect the dissolution rate of copper because the dissolution rate of copper in Comparative Example 1 and Example 1 is the same.
- Solid substrate A positive photoresist resin (thickness of about 1 ⁇ m) is placed on this solid substrate.
- the substrate was pin-coated, and this was patterned by photolithography to create a substrate with a pattern of 5 to 100 ⁇ m lines and spaces (patterned substrate).
- a substrate with this pattern cut to a length of about 50 mm and a width of about 10 mm was used as a sample for evaluation.
- Etching was performed while powering this sample vertically and horizontally in the etchant at the same etchant composition and etchant temperature as in Example 1.
- the just etching time is the time from the etching start point to the end point.
- the end point was determined by visually observing when the metal in the portion to be etched on the substrate was dissolved and the substrate was exposed. Further, the predetermined overetching time was determined by appropriately calculating from the just etching time and the amount etched by overetching (overetching amount).
- Example 2 the etching characteristics were evaluated in the same manner except that the etching solution composition was the same as that in Comparative Example 1, and the results are shown in Table 2.
- the etching solution of the present invention is permeable to fine patterns. It is excellent in that it can perform uniform etching with no residue in the fine part with a small amount of overetching.
- An etching solution was prepared in the same manner as in Example 1 except that the surfactant was not added.
- the surface tension and pH of this etching solution were as shown in Table 3-1.
- the etching solution of the present invention has excellent permeability to fine patterns, and performs uniform etching with no residue in the fine portions with a small amount of overetching. Can do.
- the copper etching solution and etching method of the present invention are used to form a copper or copper alloy thin film element, an electrode wiring element, etc. in the manufacture of semiconductor devices such as semiconductor devices and liquid crystal display devices, printed boards, IC cards, etc. Useful for.
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Abstract
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CNA200580046553XA CN101098989A (zh) | 2005-03-29 | 2005-03-29 | 铜的蚀刻液以及蚀刻方法 |
PCT/JP2005/005976 WO2006103751A1 (ja) | 2005-03-29 | 2005-03-29 | 銅エッチング液及びエッチング方法 |
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Cited By (3)
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JP2010255063A (ja) * | 2009-04-27 | 2010-11-11 | Mitsubishi Materials Corp | 銅または銅合金の組織観察用エッチング液、エッチング方法および組織観察方法 |
JP2011144377A (ja) * | 2009-06-12 | 2011-07-28 | Asahi Kasei Corp | 酸化銅用エッチング液及びそれを用いた酸化銅用エッチング方法 |
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JP2011144377A (ja) * | 2009-06-12 | 2011-07-28 | Asahi Kasei Corp | 酸化銅用エッチング液及びそれを用いた酸化銅用エッチング方法 |
KR20230125832A (ko) | 2021-01-07 | 2023-08-29 | 샌트랄 글래스 컴퍼니 리미티드 | 웨트 에칭 용액 및 웨트 에칭 방법 |
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