WO2022158481A1 - 金または金合金エッチング液組成物およびエッチング方法 - Google Patents
金または金合金エッチング液組成物およびエッチング方法 Download PDFInfo
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- WO2022158481A1 WO2022158481A1 PCT/JP2022/001757 JP2022001757W WO2022158481A1 WO 2022158481 A1 WO2022158481 A1 WO 2022158481A1 JP 2022001757 W JP2022001757 W JP 2022001757W WO 2022158481 A1 WO2022158481 A1 WO 2022158481A1
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- gold
- etching
- solution
- iodide
- etching solution
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- 238000005530 etching Methods 0.000 title claims abstract description 62
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 22
- 229910001020 Au alloy Inorganic materials 0.000 title claims description 18
- 239000003353 gold alloy Substances 0.000 title claims description 18
- 239000000203 mixture Substances 0.000 title description 2
- 229910052737 gold Inorganic materials 0.000 claims abstract description 50
- 239000010931 gold Substances 0.000 claims abstract description 50
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000003960 organic solvent Substances 0.000 claims abstract description 19
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 claims abstract description 12
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical group [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims description 30
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 27
- 239000000758 substrate Substances 0.000 claims description 21
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims description 20
- LBVMWHCOFMFPEG-UHFFFAOYSA-N 3-methoxy-n,n-dimethylpropanamide Chemical group COCCC(=O)N(C)C LBVMWHCOFMFPEG-UHFFFAOYSA-N 0.000 claims description 16
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 15
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 claims description 4
- OWBTYPJTUOEWEK-UHFFFAOYSA-N butane-2,3-diol Chemical compound CC(O)C(C)O OWBTYPJTUOEWEK-UHFFFAOYSA-N 0.000 claims description 3
- XIPFMBOWZXULIA-UHFFFAOYSA-N pivalamide Chemical compound CC(C)(C)C(N)=O XIPFMBOWZXULIA-UHFFFAOYSA-N 0.000 claims 1
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 abstract description 26
- 229910052740 iodine Inorganic materials 0.000 abstract description 26
- 239000011630 iodine Substances 0.000 abstract description 26
- 230000000694 effects Effects 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 23
- 239000007788 liquid Substances 0.000 description 10
- 239000012086 standard solution Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 6
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 description 6
- 239000007864 aqueous solution Substances 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 4
- 229910021642 ultra pure water Inorganic materials 0.000 description 4
- 239000012498 ultrapure water Substances 0.000 description 4
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 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
- 238000009499 grossing Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- XZXYQEHISUMZAT-UHFFFAOYSA-N 2-[(2-hydroxy-5-methylphenyl)methyl]-4-methylphenol Chemical compound CC1=CC=C(O)C(CC=2C(=CC=C(C)C=2)O)=C1 XZXYQEHISUMZAT-UHFFFAOYSA-N 0.000 description 2
- LVYXPOCADCXMLP-UHFFFAOYSA-N 3-butoxy-n,n-dimethylpropanamide Chemical compound CCCCOCCC(=O)N(C)C LVYXPOCADCXMLP-UHFFFAOYSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 229940107816 ammonium iodide Drugs 0.000 description 2
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- WFUBYPSJBBQSOU-UHFFFAOYSA-M rubidium iodide Chemical compound [Rb+].[I-] WFUBYPSJBBQSOU-UHFFFAOYSA-M 0.000 description 2
- 235000009518 sodium iodide Nutrition 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- UAYWVJHJZHQCIE-UHFFFAOYSA-L zinc iodide Chemical compound I[Zn]I UAYWVJHJZHQCIE-UHFFFAOYSA-L 0.000 description 2
- GCZWLZBNDSJSQF-UHFFFAOYSA-N 2-isothiocyanatohexane Chemical compound CCCCC(C)N=C=S GCZWLZBNDSJSQF-UHFFFAOYSA-N 0.000 description 1
- UNMYWSMUMWPJLR-UHFFFAOYSA-L Calcium iodide Chemical compound [Ca+2].[I-].[I-] UNMYWSMUMWPJLR-UHFFFAOYSA-L 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910001252 Pd alloy Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- OKIIEJOIXGHUKX-UHFFFAOYSA-L cadmium iodide Chemical compound [Cd+2].[I-].[I-] OKIIEJOIXGHUKX-UHFFFAOYSA-L 0.000 description 1
- XQPRBTXUXXVTKB-UHFFFAOYSA-M caesium iodide Chemical compound [I-].[Cs+] XQPRBTXUXXVTKB-UHFFFAOYSA-M 0.000 description 1
- 229910001640 calcium iodide Inorganic materials 0.000 description 1
- 229940046413 calcium iodide Drugs 0.000 description 1
- KXZJHVJKXJLBKO-UHFFFAOYSA-N chembl1408157 Chemical compound N=1C2=CC=CC=C2C(C(=O)O)=CC=1C1=CC=C(O)C=C1 KXZJHVJKXJLBKO-UHFFFAOYSA-N 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- RQQRAHKHDFPBMC-UHFFFAOYSA-L lead(ii) iodide Chemical compound I[Pb]I RQQRAHKHDFPBMC-UHFFFAOYSA-L 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- BLQJIBCZHWBKSL-UHFFFAOYSA-L magnesium iodide Chemical compound [Mg+2].[I-].[I-] BLQJIBCZHWBKSL-UHFFFAOYSA-L 0.000 description 1
- 229910001641 magnesium iodide Inorganic materials 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
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- MBHINSULENHCMF-UHFFFAOYSA-N n,n-dimethylpropanamide Chemical group CCC(=O)N(C)C MBHINSULENHCMF-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- KRIJWFBRWPCESA-UHFFFAOYSA-L strontium iodide Chemical compound [Sr+2].[I-].[I-] KRIJWFBRWPCESA-UHFFFAOYSA-L 0.000 description 1
- 229910001643 strontium iodide Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K13/00—Etching, surface-brightening or pickling compositions
-
- 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
-
- 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
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/12—Oxygen-containing compounds
- C23F11/122—Alcohols; Aldehydes; Ketones
-
- 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
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/14—Nitrogen-containing compounds
- C23F11/145—Amides; N-substituted amides
-
- 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
-
- 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
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
Definitions
- the present invention relates to a gold or gold alloy etchant and etching method formed on a substrate such as a semiconductor wafer.
- Gold films are currently used as conductors in integrated circuits, printed circuit boards, and the like.
- a gold film has high conductivity, is easy to form, and is chemically stable, but is difficult to etch.
- Etching methods for gold films are performed by wet etching. Normally, an etchant is stored in an etching bath made of quartz, Teflon (registered trademark), etc., and a dipping method in which the wafer is immersed therein. There is a spin method in which etching is performed by vacuum suction or mechanical chucking and spraying an etchant while rotating.
- gold film etchants examples include “cyanide”, “aqua regia”, and “iodine”.
- Cyanide is composed of sodium hydroxide and sodium cyanide. Gold easily forms a complex with cyanide ions, making it easy to etch. There are drawbacks such as having Therefore, in applications in the electronics industry, there are examples of using it for complete removal of lead patterns after electroplating, and there are few examples of its use (Patent Document 1).
- Aqua regia is a mixed acid of hydrochloric acid and nitric acid, and is often used in the treatment of gold films on semiconductor substrates. .
- iodine-based which consists of potassium iodide and iodine, is neutral and easy to handle, and has been widely used as an etching solution for gold films on semiconductor substrates (Patent Documents 3 and 4). .
- Patent Document 5 N-methyl-pyrrolidinone
- JP-A-8-148810 JP-A-5-136152 JP-A-5-251425 U.S. Pat. No. 5,221,421 Japanese Patent Application Laid-Open No. 2004-211142 Japanese Patent Application Laid-Open No. 2006-291341
- an object of the present invention is to provide an NMP-free gold or gold alloy etchant and an etching method which are excellent in wettability and fine workability with respect to a substrate having a gold film and a gold alloy film, and which have a long liquid life. is.
- the iodine-based etchant contains excellent wettability and fine workability for substrates having gold films and gold alloy films, and has a long liquid life, even when it does not contain NMP, and completed the present invention. came to.
- a method for etching a gold film formed on a substrate comprising immersing the substrate in the etching solution according to any one of [1] to [4].
- the gold or gold alloy etchant does not change its composition and performance, and even if high-precision microfabrication technology is required, it can be sufficiently handled without using NMP. be able to.
- FIG. 1 is a diagram showing the etching rate of a gold film with an etchant containing NMP or 3-methoxy-N,N-dimethylpropanamide.
- FIG. 2 shows contact angles of solutions containing NMP or 3-methoxy-N,N-dimethylpropanamide on bare silicon substrates.
- FIG. 3 is a diagram showing the surface state of gold bumps when the gold bump substrate is immersed in an etchant containing NMP or 3-methoxy-N,N-dimethylpropanamide.
- FIG. 4 shows the appearance of gold bumps when the gold bump substrate is immersed in an etchant containing 3-methoxy-N,N-dimethylpropanamide, 1,4-butanediol or diethylene glycol.
- the gold or gold alloy etching solution of the present invention is an etching solution comprising iodine, an iodide, an organic solvent and water.
- the iodide is not particularly limited, and examples include potassium iodide, sodium iodide, ammonium iodide, rubidium iodide, cesium iodide, magnesium iodide, calcium iodide, strontium iodide, zinc iodide, iodide Cadmium, mercury (II) iodide, lead (II) iodide and the like can be mentioned, and one or more of these can be used.
- potassium iodide, sodium iodide, and ammonium iodide are preferable as the iodide from the viewpoints of solubility in water, price, ease of handling, toxicity, and the like.
- the content of iodine in the iodine-based etching solution is not particularly limited, but can be, for example, 1 to 1000 mM. Preferably, it is 10-200 mM.
- the content of iodide in the iodine-based etching solution is not particularly limited, but can be, for example, 1 to 3000 mM. Preferably, it is 150-1500 mM.
- the content ratio of iodine and iodide is not particularly limited, but is preferably 1:3 to 1:10, more preferably 1:5 to 1:10. .
- the organic solvent used in the present invention can suppress the etching rate of a gold or gold alloy film, has excellent wettability, smoothes the gold surface, and has the effect of suppressing the amount of side etching, It suppresses volatilization of iodine.
- 3-methoxy-N,N-dimethylpropanamide 3-butoxy-N,N-dimethylpropanamide, ethylene glycol, propylene glycol, diethylene glycol, 1,2-ethanediol, 1,4-butanediol and 2,3-butanediol, preferably 1,4-butanediol, ethylene glycol, 3-methoxy-N,N-dimethylpropanamide, more preferably 3-methoxy-N,N-dimethylpropanamide.
- the content of the organic solvent in the etching solution is not particularly limited, and it is preferable to appropriately adjust the amount used according to the type of organic solvent used. Generally, it can be used in the range of 1 to 99% by volume, preferably 5 to 50% by volume, more preferably 10 to 40% by volume. For example, when the additive is N,N-dimethylpropanamide, the amount used is preferably 10-30% by volume, more preferably 15-25% by volume.
- the etchant contains water.
- the content of water in the etchant is not particularly limited, and can be, for example, the remainder of other components.
- the water content can be 1-99% by volume, preferably 60-90% by volume.
- the etchant of the present invention described above is used to etch gold and gold alloys.
- Gold alloys include, for example, gold alloys of gold and palladium, magnesium, aluminum, titanium, manganese, iron, cobalt, nickel, molybdenum, tungsten, platinum, silver, copper, etc.
- One or two of these Etchants can be applied to more than one species combination.
- the content of gold in the gold alloy is preferably 60% by weight or more, more preferably 80% by weight or more.
- Etching conditions using the etching solution of the present invention are not particularly limited, and, for example, etching can be performed according to the conditions of known etching methods.
- a method for contacting the object to be etched with the etchant for example, there is a dipping method in which the object to be etched is immersed in a container filled with an iodine-based etchant. At that time, it is preferable to shake the object to be etched or forcefully circulate the iodine-based etching solution in the container. As a result, the object to be etched is uniformly etched.
- a spray method of spraying an iodine-based etchant onto an object to be etched, or a spin method of ejecting an iodine-based etchant from a nozzle onto a rotating object to be etched may be used.
- the etching time is not particularly limited, and can be, for example, 1 to 60 minutes.
- the etching temperature is not particularly limited, for example, 20 to 50 ° C. can be At this time, if necessary, the temperature of the iodine-based etchant, the object to be etched, etc. may be adjusted by heating means such as a heater or cooling means.
- the present invention also relates to a method of etching a gold film or a gold alloy film using the etching solution described above, and a method of manufacturing a semiconductor material formed by the method.
- Examples of the semiconductor material formed by the above method include wiring materials and bumps.
- the gold bump substrate was washed with ultrapure water and dried with nitrogen gas, and the surface smoothing ability and appearance of the gold bump were observed using a scanning electron microscope (SEM) (Hitachi High Tech SU8200 series). The results are shown in Table 3 and FIGS. 3 and 4.
- SEM scanning electron microscope
- the appearance of the gold bumps in FIG. 4 was obtained by immersing the sputtered gold layer in the etchants of Comparative Example 13 and Examples 15, 16 and 18 at a liquid temperature of 25° C. in which the gold bump substrate was stirred at about 350 rpm for just the etching time. It was obtained by
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Abstract
Description
金膜のエッチング方法はウエットエッチングにより行われており、通常、石英やテフロン(登録商標)などでできたエッチング槽内にエッチング液を貯め、そこにウエハを浸漬するディップ方式と、ウエハを支持台に真空吸引あるいは機械的にチャッキングし、回転させながらエッチング液をスプレーしてエッチングを行うスピン方式がある。
「シアン系」は、水酸化ナトリウムとシアン化ナトリウムを成分とし、金はシアンイオンと錯体を形成し易いためエッチングが容易であるが、強アルカリ性であるために扱いにくく、また刺激が強く、毒性を有する等の欠点がある。従って、電子工業の用途では、電解めっき後にリードパターンの完全な除去に用いた例があるほか使用例は少ない(特許文献1)。
「王水系」は、塩酸と硝酸の混酸であり、半導体基板における金膜の処理においてもよく使用されるが、エッチング速度が遅く、また強酸性のため扱い難いという欠点がある(特許文献2)。
これに対し、「ヨウ素系」は、ヨウ化カリウムとヨウ素からなり、液性は中性で扱い易いため、半導体基板における金膜のエッチング液として多用されてきた(特許文献3、特許文献4)。
[1]ヨウ素、ヨウ化物、有機溶媒および水を含むこと特徴とする金または金合金のエッチング液であって、有機溶剤が、3‐メトキシ‐N,N‐ジメチルプロパンアミド、3‐ブトキシ‐N,N‐ジメチルプロパンアミド、エチレングリコール、プロピレングリコール、ジエチレングリコール、1,2‐エタンジオール、1,4‐ブタンジオールおよび2,3‐ブタンジオールからなる群から1種または2種以上であることを特徴とする、前記エッチング液に関する。
ヨウ素系エッチング液中におけるヨウ化物の含有量は、特には限定されないが、例えば、1~3000mMとすることができる。好ましくは、150~1500mMである。
また、ヨウ素とヨウ化物との含有量の比率(モル濃度比、ヨウ素:ヨウ化物)は特に限定されないが、好ましくは1:3~1:10、さらに好ましくは1:5~1:10である。
金合金としては、例えば、金とパラジウム、マグネシウム、アルミニウム、チタン、マンガン、鉄、コバルト、ニッケル、モリブデン、タングステン、白金、銀、銅等との金合金が挙げられ、これらのうち1種または2種以上を組み合わせたものに対し、エッチング液を適用可能である。
なお、金合金中、金の含有量は、60重量%以上であることが好ましく、80重量%以上であることがより好ましい。
エッチング対象物とエッチング液との接触方法としては、例えば、容器にヨウ素系エッチング液を満たしてエッチング対象物を浸漬するディップ方式等が挙げられる。その際、当該エッチング対象物を揺動するまたは容器内のヨウ素系エッチング液を強制循環させることが好ましい。これにより、エッチング対象物が均一にエッチングされる。
また、ヨウ素系エッチング液を噴霧により、エッチング対象物へ付着させるスプレー方式や、回転するエッチング対象物にノズルよりヨウ素系エッチング液を吐出するスピン方式等を用いてもよい。また、これらとディップ方式とを併用してもよい。
エッチングの時間は、特に限定されず、例えば、1~60分間とすることができる。
また、エッチング温度(ディップ方式においてはヨウ素系エッチング液の温度、スプレー方式、スピン方式においては、ヨウ素系エッチング液の温度またはエッチング対象物の温度)は、特に限定されず、例えば、20~50℃とすることができる。この際、必要に応じて、ヒーター等の加熱手段や、冷却手段によって、ヨウ素系エッチング液、エッチング対象物等の温度調節を行ってもよい。
以上、本発明について好適な実施態様に基づき詳細に説明したが、本発明はこれに限定されず、各構成は、同様の機能を発揮し得る任意のものと置換することができ、あるいは、任意の構成を付加することもできる。
ヨウ素0.079M、ヨウ化カリウム0.60Mの水溶液を標準液とし、この標準液に有機溶剤を添加したエッチング液を調整した。
つぎに、2×2cmのNi試片に厚さ3μmの電解金めっきを施し、約200rpmで撹拌した液温30℃の前記エッチング液に1分間浸漬させてエッチングした。
試片を超純水で洗浄、窒素ガスにて乾燥して重量法にてエッチングレートを算出した。その結果を表1と図1に示す。
[表1] 金膜のエッチングレート
表1と図1の結果より、NMPを用いることなく、1,4-ブタンジオール、ジエチレングリコールおよび3-メトキシ-N,N-ジメチルプロパンアミドによりエッチングレートを制御できること、さらには、これらの有機溶剤がNMPと比較して優れたエッチング制御性を有することが認められた。
ヨウ素0.079M、ヨウ化カリウム0.60Mの水溶液を標準液とし、この標準液に有機溶剤を添加した溶液を調整した。また、1%希フッ酸溶液で1分間処理した後、超純水で洗浄、窒素ガスにて乾燥したベアシリコン基板を用意した。
つぎに、上記溶液1μlのベアシリコン基板上での接触角を、接触角計(共和界面科学株式会社製CA-X150型)を用いて測定した。その結果を表2と図2に示す。
[表2] 接触角
表2と図2の結果より、NMPを用いることなく、1,4-ブタンジオール、ジエチレングリコールおよび3-メトキシ-N,N-ジメチルプロパンアミドにより50℃以下の接触角を達成できること、すなわち、優れた濡れ性を有することが認められた。
ヨウ素0.079M、ヨウ化カリウム0.60Mの水溶液を標準液とし、この標準液に有機溶剤を添加したエッチング液を調整した。
つぎに、1×1cmの金バンプ基板(金バンプ(15μm)/金スパッタ層(210nm)/TiW層/Si層)を約200rpmで撹拌した液温30℃の前記エッチング液に金スパッタ層のジャストエッチング時間浸漬させてエッチングした。
金バンプ基板を超純水で洗浄、窒素ガスにて乾燥して、走査電子顕微鏡(SEM)(株式会社日立ハイテクSU8200series)を用いて金バンプの表面平滑化能と外観を観察した。その結果を表3と図3および図4に示す。
なお、図4の金バンプ外観は、金バンプ基板を約350rpmで撹拌した液温25℃の比較例13と実施例15、16および18のエッチング液のエッチング液に金スパッタ層のジャストエッチング時間浸漬させて得られたものである。
[表3] 表面平滑化能
表3と図3の結果より、NMPを用いることなく、1,4-ブタンジオール、ジエチレングリコールおよび3-メトキシ-N,N-ジメチルプロパンアミドにより、NMPと同等の金バンプ表面平滑化能を有することが確認できた。
ヨウ素0.027M、ヨウ化カリウム0.11Mの水溶液を標準液とし、この標準液に有機溶剤を添加したエッチング液を調整した。
つぎに、2×1cmのスパッタ金基板(レジスト/金スパッタ層(50nm)/Ti層/Si層)を約200rpmで撹拌した液温25℃の前記エッチング液に金スパッタ層のジャストエッチング時間×1.5浸漬させてエッチングした。
スパッタ金基板を超純水で洗浄、窒素ガスにて乾燥して、走査電子顕微鏡(SEM)(株式会社日立ハイテクSU8200series)を用いてサイドエッチング量を観察した。その結果を表4に示す。
[表4]サイドエッチング量
表4の結果より、NMPを用いることなく、1,4-ブタンジオール、ジエチレングリコールおよび3-メトキシ-N,N-ジメチルプロパンアミドにより、サイドエッチング量抑制効果を奏することが確認できた。
ヨウ素0.079M、ヨウ化カリウム0.60Mの水溶液を標準液とし、この標準液に有機溶剤を添加した溶液を調整し、一定時間経過毎にチオ硫酸ナトリウム溶液を用いた酸化還元滴定により、ヨウ素揮発抑制能を評価した。その結果を表5に示す。
Claims (5)
- ヨウ素、ヨウ化物、有機溶媒および水を含むこと特徴とする金または金合金のエッチング液であって、有機溶剤が、3‐メトキシ‐N,N‐ジメチルプロパンアミド、3‐ブトキシ‐N,N‐ジメチルプロパンアミド、エチレングリコール、プロピレングリコール、ジエチレングリコール、1,2‐エタンジオール、1,4‐ブタンジオールおよび2,3‐ブタンジオールからなる群から1種または2種以上であることを特徴とする、前記エッチング液。
- 有機溶剤が、3‐メトキシ‐N,N‐ジメチルプロパンアミドであることを特徴とする、請求項1に記載のエッチング液。
- N-メチル-2-ピロリジノンを含有しない、請求項1または2に記載のエッチング液。
- ヨウ化物がヨウ化カリウムであることを特徴とする、請求項1~3のいずれかに記載のエッチング液。
- 請求項1~4のいずれかに記載のエッチング液に基板を浸漬することを特徴とする、基板上に形成された金膜をエッチングする方法。
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US18/273,746 US20240076547A1 (en) | 2021-01-21 | 2022-01-19 | Etching solution and etching method for gold or gold alloy |
KR1020237024166A KR20230131211A (ko) | 2021-01-21 | 2022-01-19 | 금 또는 금합금의 에칭액 및 에칭 방법 |
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JPH05136152A (ja) | 1991-05-10 | 1993-06-01 | Northern Telecom Ltd | 光−電子部品 |
US5221421A (en) | 1992-03-25 | 1993-06-22 | Hewlett-Packard Company | Controlled etching process for forming fine-geometry circuit lines on a substrate |
JPH08148810A (ja) | 1994-11-16 | 1996-06-07 | Hitachi Chem Co Ltd | プリント配線板の製造法 |
JP2004211142A (ja) | 2002-12-27 | 2004-07-29 | Kanto Chem Co Inc | エッチング液 |
JP2006199987A (ja) * | 2005-01-19 | 2006-08-03 | Mitsubishi Chemicals Corp | エッチング液及びエッチング方法 |
JP2006291341A (ja) | 2005-04-14 | 2006-10-26 | Kanto Chem Co Inc | 金属選択性エッチング液 |
JP2014047402A (ja) * | 2012-08-31 | 2014-03-17 | Sony Corp | エッチング液、導電性素子の製造方法、および加工体の製造方法 |
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2021
- 2021-01-21 JP JP2021008291A patent/JP2022112426A/ja active Pending
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- 2022-01-19 TW TW111102254A patent/TW202233892A/zh unknown
- 2022-01-19 KR KR1020237024166A patent/KR20230131211A/ko unknown
- 2022-01-19 WO PCT/JP2022/001757 patent/WO2022158481A1/ja active Application Filing
- 2022-01-19 US US18/273,746 patent/US20240076547A1/en active Pending
- 2022-01-19 EP EP22742603.8A patent/EP4283014A1/en active Pending
- 2022-01-19 CN CN202280007346.7A patent/CN116406431A/zh active Pending
Patent Citations (7)
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JPH05136152A (ja) | 1991-05-10 | 1993-06-01 | Northern Telecom Ltd | 光−電子部品 |
US5221421A (en) | 1992-03-25 | 1993-06-22 | Hewlett-Packard Company | Controlled etching process for forming fine-geometry circuit lines on a substrate |
JPH08148810A (ja) | 1994-11-16 | 1996-06-07 | Hitachi Chem Co Ltd | プリント配線板の製造法 |
JP2004211142A (ja) | 2002-12-27 | 2004-07-29 | Kanto Chem Co Inc | エッチング液 |
JP2006199987A (ja) * | 2005-01-19 | 2006-08-03 | Mitsubishi Chemicals Corp | エッチング液及びエッチング方法 |
JP2006291341A (ja) | 2005-04-14 | 2006-10-26 | Kanto Chem Co Inc | 金属選択性エッチング液 |
JP2014047402A (ja) * | 2012-08-31 | 2014-03-17 | Sony Corp | エッチング液、導電性素子の製造方法、および加工体の製造方法 |
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JP2022112426A (ja) | 2022-08-02 |
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