WO2011105129A1 - 酸化銅用エッチング液及びそれを用いたエッチング方法 - Google Patents
酸化銅用エッチング液及びそれを用いたエッチング方法 Download PDFInfo
- Publication number
- WO2011105129A1 WO2011105129A1 PCT/JP2011/050549 JP2011050549W WO2011105129A1 WO 2011105129 A1 WO2011105129 A1 WO 2011105129A1 JP 2011050549 W JP2011050549 W JP 2011050549W WO 2011105129 A1 WO2011105129 A1 WO 2011105129A1
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- WO
- WIPO (PCT)
- Prior art keywords
- copper oxide
- acid
- etching
- etching solution
- copper
- Prior art date
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- FBKZHCDISZZXDK-UHFFFAOYSA-N bathocuproine disulfonic acid Chemical compound C=12C=CC3=C(C=4C=CC(=CC=4)S(O)(=O)=O)C=C(C)N=C3C2=NC(C)=CC=1C1=CC=C(S(O)(=O)=O)C=C1 FBKZHCDISZZXDK-UHFFFAOYSA-N 0.000 description 1
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- 159000000007 calcium salts Chemical class 0.000 description 1
- JOOPRXVUNTUGSV-UHFFFAOYSA-L calcium;diperiodate Chemical compound [Ca+2].[O-]I(=O)(=O)=O.[O-]I(=O)(=O)=O JOOPRXVUNTUGSV-UHFFFAOYSA-L 0.000 description 1
- RMISVBXFFXBNAD-UHFFFAOYSA-N calcium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium Chemical compound [Ca+2].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O RMISVBXFFXBNAD-UHFFFAOYSA-N 0.000 description 1
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- 125000002091 cationic group Chemical group 0.000 description 1
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- 239000000470 constituent Substances 0.000 description 1
- JZCCFEFSEZPSOG-UHFFFAOYSA-L copper(II) sulfate pentahydrate Chemical compound O.O.O.O.O.[Cu+2].[O-]S([O-])(=O)=O JZCCFEFSEZPSOG-UHFFFAOYSA-L 0.000 description 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 1
- GLGSRACCZFMWDT-UHFFFAOYSA-N dilithium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium Chemical compound [Li+].[Li+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O GLGSRACCZFMWDT-UHFFFAOYSA-N 0.000 description 1
- AXZAYXJCENRGIM-UHFFFAOYSA-J dipotassium;tetrabromoplatinum(2-) Chemical compound [K+].[K+].[Br-].[Br-].[Br-].[Br-].[Pt+2] AXZAYXJCENRGIM-UHFFFAOYSA-J 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
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- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
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- 125000000524 functional group Chemical group 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
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- DKAGJZJALZXOOV-UHFFFAOYSA-N hydrate;hydrochloride Chemical compound O.Cl DKAGJZJALZXOOV-UHFFFAOYSA-N 0.000 description 1
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- 238000007654 immersion Methods 0.000 description 1
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- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 1
- XQHAGELNRSUUGU-UHFFFAOYSA-M lithium chlorate Chemical compound [Li+].[O-]Cl(=O)=O XQHAGELNRSUUGU-UHFFFAOYSA-M 0.000 description 1
- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical compound [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 description 1
- 229910001486 lithium perchlorate Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- ULVBLLSOTHFGPC-UHFFFAOYSA-M lithium;perbromate Chemical compound [Li+].[O-]Br(=O)(=O)=O ULVBLLSOTHFGPC-UHFFFAOYSA-M 0.000 description 1
- SYWXNZXEJFSLEU-UHFFFAOYSA-M lithium;periodate Chemical compound [Li+].[O-]I(=O)(=O)=O SYWXNZXEJFSLEU-UHFFFAOYSA-M 0.000 description 1
- UAJMEYCHOVZMRB-UHFFFAOYSA-N magnesium dioxido(dioxo)manganese Chemical compound [Mg+2].[O-][Mn]([O-])(=O)=O UAJMEYCHOVZMRB-UHFFFAOYSA-N 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- GIOZLVMCHDGNNZ-UHFFFAOYSA-N magnesium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium Chemical compound [Mg+2].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O GIOZLVMCHDGNNZ-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- LULAYUGMBFYYEX-UHFFFAOYSA-N metachloroperbenzoic acid Natural products OC(=O)C1=CC=CC(Cl)=C1 LULAYUGMBFYYEX-UHFFFAOYSA-N 0.000 description 1
- HJKJWWIYCWDQAL-UHFFFAOYSA-N methylazanium tetrahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].C[NH3+].C[NH3+].C[NH3+].C[NH3+] HJKJWWIYCWDQAL-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- NALMPLUMOWIVJC-UHFFFAOYSA-N n,n,4-trimethylbenzeneamine oxide Chemical compound CC1=CC=C([N+](C)(C)[O-])C=C1 NALMPLUMOWIVJC-UHFFFAOYSA-N 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 229960003244 ornithine hydrochloride Drugs 0.000 description 1
- 239000012285 osmium tetroxide Substances 0.000 description 1
- 229910000489 osmium tetroxide Inorganic materials 0.000 description 1
- 125000006353 oxyethylene group Chemical group 0.000 description 1
- 229960003330 pentetic acid Drugs 0.000 description 1
- KHIWWQKSHDUIBK-UHFFFAOYSA-N periodic acid Chemical compound OI(=O)(=O)=O KHIWWQKSHDUIBK-UHFFFAOYSA-N 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920002503 polyoxyethylene-polyoxypropylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- 229940094037 potassium bromate Drugs 0.000 description 1
- 235000019396 potassium bromate Nutrition 0.000 description 1
- VKJKEPKFPUWCAS-UHFFFAOYSA-M potassium chlorate Chemical compound [K+].[O-]Cl(=O)=O VKJKEPKFPUWCAS-UHFFFAOYSA-M 0.000 description 1
- JLKDVMWYMMLWTI-UHFFFAOYSA-M potassium iodate Chemical compound [K+].[O-]I(=O)=O JLKDVMWYMMLWTI-UHFFFAOYSA-M 0.000 description 1
- 239000001230 potassium iodate Substances 0.000 description 1
- 235000006666 potassium iodate Nutrition 0.000 description 1
- 229940093930 potassium iodate Drugs 0.000 description 1
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- VXLUZERCXISKBW-UHFFFAOYSA-M potassium;perbromate Chemical compound [K+].[O-]Br(=O)(=O)=O VXLUZERCXISKBW-UHFFFAOYSA-M 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000007261 regionalization Effects 0.000 description 1
- JXKBGDWVKKEDGU-UHFFFAOYSA-M silver;perbromate Chemical compound [Ag+].[O-]Br(=O)(=O)=O JXKBGDWVKKEDGU-UHFFFAOYSA-M 0.000 description 1
- JWUKKEHXERVSKS-UHFFFAOYSA-M silver;periodate Chemical compound [Ag+].[O-]I(=O)(=O)=O JWUKKEHXERVSKS-UHFFFAOYSA-M 0.000 description 1
- XUXNAKZDHHEHPC-UHFFFAOYSA-M sodium bromate Chemical compound [Na+].[O-]Br(=O)=O XUXNAKZDHHEHPC-UHFFFAOYSA-M 0.000 description 1
- 239000011697 sodium iodate Substances 0.000 description 1
- 235000015281 sodium iodate Nutrition 0.000 description 1
- 229940032753 sodium iodate Drugs 0.000 description 1
- ZNCPFRVNHGOPAG-UHFFFAOYSA-L sodium oxalate Chemical compound [Na+].[Na+].[O-]C(=O)C([O-])=O ZNCPFRVNHGOPAG-UHFFFAOYSA-L 0.000 description 1
- 229940039790 sodium oxalate Drugs 0.000 description 1
- BAZAXWOYCMUHIX-UHFFFAOYSA-M sodium perchlorate Chemical compound [Na+].[O-]Cl(=O)(=O)=O BAZAXWOYCMUHIX-UHFFFAOYSA-M 0.000 description 1
- 229910001488 sodium perchlorate Inorganic materials 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- CLURAKRVQIPBCC-UHFFFAOYSA-M sodium;perbromate Chemical compound [Na+].[O-]Br(=O)(=O)=O CLURAKRVQIPBCC-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- ODBLHEXUDAPZAU-UHFFFAOYSA-N threo-D-isocitric acid Natural products OC(=O)C(O)C(C(O)=O)CC(O)=O ODBLHEXUDAPZAU-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
-
- 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
- C09K13/04—Etching, surface-brightening or pickling compositions containing an inorganic acid
- C09K13/06—Etching, surface-brightening or pickling compositions containing an inorganic acid with organic material
-
- 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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/0041—Photosensitive materials providing an etching agent upon exposure
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/30—Imagewise removal using liquid means
- G03F7/32—Liquid compositions therefor, e.g. developers
- G03F7/322—Aqueous alkaline compositions
-
- 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
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/033—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers
- H01L21/0334—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/0337—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane characterised by the process involved to create the mask, e.g. lift-off masks, sidewalls, or to modify the mask, e.g. pre-treatment, post-treatment
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
Definitions
- the present invention relates to an etching solution for copper oxide and an etching method used in an etching process in a fine pattern processing technique using copper oxide as a heat-reactive resist material.
- resist materials are photo-reactive organic resists (hereinafter referred to as “photoresists”) that react with exposure light sources such as ultraviolet light, electron beams, and X-rays.
- photoresists photo-reactive organic resists
- exposure light sources such as ultraviolet light, electron beams, and X-rays.
- the intensity of the laser light normally focused by a lens shows a Gaussian distribution shape as shown in FIG.
- the spot diameter is defined as 1 / e 2 .
- a method using a photoreactive organic resist is a very effective method for forming a fine pattern of about several hundreds of nanometers, a finer pattern is formed because a photoreactive photoresist is used. Therefore, it is necessary to perform exposure with a spot smaller than the pattern required in principle. Therefore, a KrF laser or ArF laser having a short wavelength must be used as the exposure light source.
- these light source devices are very large and expensive, they are not suitable from the viewpoint of manufacturing cost reduction.
- an exposure light source such as an electron beam or X-ray
- the exposure atmosphere needs to be in a vacuum state, so a vacuum chamber is used, and there are considerable limitations from the viewpoint of cost and enlargement.
- the temperature of the object when an object is irradiated with laser light having the distribution shown in FIG. 1, the temperature of the object also exhibits the same Gaussian distribution as the intensity distribution of the laser light.
- a resist that reacts at a certain temperature or higher that is, a heat-reactive resist
- the reaction proceeds only at a portion that exceeds a predetermined temperature as shown in FIG. (Light irradiation part ⁇ exposure part). That is, a pattern finer than the spot diameter can be formed without reducing the wavelength of the exposure light source. Therefore, the influence of the exposure light source wavelength can be reduced by using the heat-reactive resist.
- Patent Documents 2 to 5 there has been reported a technique for forming a fine pattern by exposure with a semiconductor laser or the like, or thermal / photoreaction using WOx, MoOx, noble metal oxide or the like as a thermal reaction type resist (for example, Patent Documents 2 to 5).
- WOx and MoOx are resist materials called incomplete oxides in which the degree of oxidation X is set to a value smaller than that of a complete oxide. The degree of oxidation X is changed by heating by exposure, and the difference in the degree of oxidation is different from the etching solution.
- a fine pattern can be formed by making a difference in solubility and etching.
- the etching characteristics change due to a slight difference in the degree of oxidation X, and it is extremely advanced to produce a highly reproducible resist from many parameters such as the state of the starting material, the film formation method, and the exposure method.
- Technology is required.
- W and Mo have a problem of low resistance to dry etching using a fluorine-based gas.
- the noble metal oxide induces decomposition of the noble metal oxide by thermal reaction, photoreaction, etc., and forms a fine pattern by etching by creating a difference in solubility with respect to the etching solution at the undecomposed / decomposed portion.
- decomposition occurs when the material reaches a specific temperature (decomposition temperature), so that it is not greatly affected by the state of the starting material (for example, a slight difference in the degree of oxidation).
- the feature is that it is easy to obtain a resist with very good reproducibility.
- the noble metal oxides of decomposition materials used in Patent Document 3 and Patent Document 4 cause a decomposition reaction by thermal reaction, photoreaction, etc.
- the resist portion remaining after etching can take only a random sea-island structure, and it is difficult to control the pattern size, such as uniform unevenness and line-shaped fine patterns.
- the copper oxide which is a noble metal oxide
- reaches a decomposition temperature it causes a sharp decomposition and releases oxygen, and the particle growth is also suppressed as compared with the noble metal oxide used in Patent Document 3 and Patent Document 4. Therefore, it is a resist material effective for forming a fine pattern.
- Patent Documents 5 to 8 although there are many copper etchants, selective and highly accurate exposure / unexposure when exposed using a noble metal oxide, particularly a copper oxide, is performed. It has not been reported that etching of the exposed portion has been achieved.
- JP 2007-144959 A Japanese Patent No. 4055543 JP 2008-143162 A JP 2008-168610 A JP 2005-105410 A JP 2005-105333 A JP 2001-262374 A JP 2008-088541 A
- the present invention has been made in view of such points, and when exposed to laser light using a copper oxide as a heat-reactive resist material, an oxidation that can selectively etch exposed and unexposed portions.
- An object is to provide an etching solution for copper and an etching method using the same.
- the inventors of the present application have found that, when exposed using an oxide of copper as a heat-reactive resist material with an aqueous solution containing at least a chelating agent, the It has been found that selective etching of the exposed portion can be achieved, and the present invention has been completed. That is, the present invention is as follows.
- An etching solution for copper oxide according to the present invention is an etching solution for copper oxide for selectively etching copper oxides having different oxidation numbers in a copper oxide-containing layer containing copper oxide as a main component, and at least a chelating agent Or a salt thereof.
- the chelating agent is an amino acid such as alanine, arginine, asparagine, aspartic acid, cysteine, glutamine, glutamic acid, glycine, histidine, isoleucine, leucine, lysine, methionine, ornithine, phenylalanine.
- chelating agents such as oxalic acid, ethylenediaminetetraacetic acid, hydroxyethylethylenediaminetriacetic acid, dihydroxyethylethylenediaminediacetic acid, 1,3-propanediaminetetraacetic acid, citric acid, It is preferable to include at least one selected from the group consisting of fumaric acid, adipic acid, succinic acid, malic acid, tartaric acid, bathocuproin sulfonic acid, and salts thereof.
- the chelating agent preferably contains at least one amino acid.
- the amino acid preferably contains at least one selected from the group consisting of alanine, glycine, lysine and ornithine.
- the ratio of the chelating agent in the etching solution for copper oxide is preferably 0.00001% by mass or more and 10% by mass or less.
- the etching method of the present invention is an etching method using the above copper oxide etchant, and a thermal decomposition step of thermally decomposing copper oxide in a predetermined region of the copper oxide-containing layer containing copper oxide, An etching step of supplying the copper oxide-containing etchant to the copper oxide-containing layer and removing copper oxide in a predetermined region thermally decomposed from the copper oxide-containing layer.
- a liquid discharge pressure when the copper oxide etching solution is applied in the etching step is 0.005 MPa or more and 0.15 MPa or less.
- an etching solution for copper oxide capable of selectively etching an exposed / unexposed portion and the same are used.
- An etching method can be provided.
- the present inventors have examined a fine pattern processing technique that can form a fine pattern with a high aspect ratio.
- an organic resist material is used for forming a fine pattern
- the entire organic resist material in the exposed portion reacts, so that the processing accuracy of the fine pattern is limited by the wavelength of the laser beam.
- the heat-reactive resist material that reacts thermally by heating only the heat-reactive resist material in a region that reaches a specific temperature (decomposition temperature) reacts thermally. For this reason, by using a heat-reactive resist material for forming a fine pattern, it may be possible to form a fine pattern having a wavelength shorter than that of the laser beam.
- Copper oxides include copper oxide (II) and copper oxide (I).
- copper oxide (II) When copper oxide (II) is heated above a certain temperature, oxygen is released and reduced to copper oxide (I).
- the This thermal decomposition reaction from copper oxide (II) to copper oxide (I) proceeds steeply. Therefore, by appropriately controlling the temperature of heating, copper oxide (in a desired region in the thermal reaction type resist material ( II) can be selectively thermally decomposed into copper (I) oxide. For this reason, it is possible to form a fine pattern with a high aspect ratio by using an etching solution for copper oxide that selectively dissolves copper (I) oxide in the thermally-reactive resist material after thermal decomposition. Become.
- the present inventors diligently studied about an etching solution for copper oxide that selectively acts on copper (I) oxide.
- an etching solution for copper oxide containing a predetermined chelating agent or a salt thereof copper (I) oxide is selectively selected from resist materials in which copper oxides having different oxidation numbers after thermal decomposition are mixed.
- the present invention has been completed by finding that it can be dissolved in an aqueous solution, has a high aspect ratio, and can form a fine pattern.
- the etching target of the etching solution for copper oxide according to the present invention is a copper oxide.
- a copper oxide-containing layer containing a copper oxide as a main component as a heat-reactive resist material when exposed to a laser beam using a copper oxide-containing layer containing a copper oxide as a main component as a heat-reactive resist material.
- it is used when the exposed / unexposed portion is selectively etched.
- the etching solution for copper oxide according to the present invention is an aqueous solution obtained by mixing at least a chelating agent, particularly water. Copper oxide used as a heat-reactive resist material releases oxygen when it reaches the decomposition temperature due to the heat of laser light exposure, causing decomposition, resulting in a copper oxide having a structure different from that before exposure and a lower oxidation composition. Become.
- an etching solution for copper oxide containing at least a chelating agent to at least two types of oxidized copper oxides having different structures and compositions by such exposure, the chelating agent is exposed to copper after exposure. By reacting with the oxide, the copper oxide in the exposed portion can be selectively dissolved.
- the chelating agent in this invention refers to the organic acid which has a some carboxyl group, an amino group, etc. in the same molecule, and can coordinate to copper by an at least 2 or more functional group.
- the main component of copper oxide is 50% by mass or more, preferably 70% by mass or more, more preferably 80% by mass or more, most preferably, of the constituent components of the copper oxide-containing layer. It means that 90 mass% or more is made of a copper oxide. In addition, an upper limit is 100 mass% or less. When the ratio of the copper oxide is less than 50% by mass, the decomposition reaction of the copper oxide does not proceed uniformly, making selective etching difficult.
- amino acids such as alanine, arginine, asparagine, aspartic acid, cysteine, glutamine, glutamic acid, glycine, histidine, isoleucine, leucine, lysine, methionine, ornithine, phenylalanine, serine, threonine , Tryptophan, tyrosine, valine, proline, and other chelating agents other than amino acids such as oxalic acid, ethylenediaminetetraacetic acid, hydroxyethylethylenediaminetriacetic acid, dihydroxyethylethylenediaminediacetic acid, 1,3-propanediaminetetraacetic acid, diethylenetriaminepentaacetic acid , Triethylenetetramine hexaacetic acid, 1,2-diaminopropanetetraacetic acid, ethylenediamine disuccinic acid, dihydroxyethyl
- carboxylic acids and sulfonic acids when a plurality of carboxylic acids and sulfonic acids are included in the molecule, all carboxylic acids and sulfonic acids may be in a salt form, and only some carboxylic acids and sulfonic acids are in a salt form. It may be.
- the chelating agent and its salt in the present invention contain at least one of these chelating agents and their salts.
- these chelating agents from the viewpoint of easy availability and solubility in water, alanine, arginine, asparagine, aspartic acid, cysteine, glutamine, glutamic acid, glycine, histidine, isoleucine, leucine, lysine, methionine, ornithine, Phenylalanine, serine, threonine, tryptophan, tyrosine, valine, proline, and other chelating agents such as oxalic acid, ethylenediaminetetraacetic acid, hydroxyethylethylenediaminetriacetic acid, dihydroxyethylethylenediaminediacetic acid, 1,3-propanediaminetetraacetic acid, citric acid , Fumaric acid, adipic acid, succinic acid, malic acid, tartaric acid, bathocuproin
- the activation energy required for complexation between the copper oxide whose degree of oxidation has changed by exposure and the chelating agent is used for complexation between the copper oxide and chelating agent before exposure. Since the activation energy is lower than the necessary activation energy, the complex formation reaction of the chelate with the copper oxide whose degree of oxidation has changed by exposure proceeds more rapidly. Further, the stability of the complex formation product is more stable in the copper oxide after the exposure, so that the copper oxide in the exposed portion can be selectively dissolved.
- the chelating agent contains at least one amino acid
- chelate formation proceeds more rapidly with the copper oxide whose degree of oxidation has been changed by exposure.
- the stability of the complex-forming product is more stable with the copper oxide after exposure, so that the copper oxide in the exposed portion can be more selectively dissolved.
- the solubility in water is particularly high, and therefore the concentration controllable range is wide. Then, chelate formation proceeds more rapidly with the copper oxide whose degree of oxidation has been changed by exposure. Furthermore, the stability of the complex-forming product is also more stable with the copper oxide after the exposure, so that the copper oxide in the exposed portion can be particularly selectively dissolved.
- Some chelating agents are used as copper etchants. However, even though it can be generally used as an etching solution for copper, there are some that cannot be used as an etching solution selective to copper oxide having different oxidation numbers. For example, an etching solution containing a copper ammine complex can be used as a copper etching solution. However, in these etching solutions, a sufficient difference in complex formation constant depending on the valence cannot be obtained. It is difficult to selectively etch copper oxide.
- etching solution for copper oxide In the etching solution for copper oxide according to the present invention, other components such as an acid, an alkali, an oxidizing agent, and a surfactant are added at any concentration within a range that does not greatly inhibit the chelation reaction between the copper oxide and the chelating agent. It doesn't matter.
- the oxidizing agent is not particularly limited as long as it is a commonly used oxidizing agent.
- Specific examples include hydrogen peroxide, sodium permanganate, potassium permanganate, ammonium permanganate, calcium permanganate, Magnesium manganate, silver permanganate, barium permanganate, lithium chlorate, sodium chlorate, potassium chlorate, ammonium chlorate, lithium bromate, sodium bromate, potassium bromate, ammonium bromate, lithium iodate, Sodium iodate, potassium iodate, ammonium iodate, perchloric acid, lithium perchlorate, sodium perchlorate, potassium perchlorate, ammonium perchlorate, calcium perchlorate, silver perchlorate, perbromate, Lithium perbromate, sodium perbromate, potassium perbromate, perbromine Ammonium, calcium perbromate, silver perbromate, periodate, lithium periodate, sodium periodate, potassium periodate, ammonium periodate, calcium periodate, silver periodate,
- hydrogen peroxide, potassium permanganate, lithium persulfate, sodium persulfate, potassium persulfate, ammonium persulfate, and iron chloride are preferable from the viewpoint of easy availability, safety, and environmental load. Further, hydrogen peroxide, sodium persulfate, potassium persulfate, ammonium persulfate, and iron chloride are most preferable.
- the surfactant is not particularly limited as long as it improves wettability and permeability, and a commercially available one may be used as it is or may be synthesized.
- the surfactant includes four types of anionic, cationic, nonionic and amphoteric. Of these, anionic, nonionic and amphoteric are preferable, and anionic and nonionic are particularly preferable. These surfactants may be used alone or in combination of two or more.
- anionic surfactant examples include carboxylic acid type, sulfonic acid type, sulfate ester type, and phosphate ester type.
- nonionic surfactant examples include a polyethylene glycol type, a polyalkylene glycol type, a polyhydric alcohol type, and an acetylene type.
- anionic surfactant olefin sulfonic acid, alkyl sulfonic acid, benzene sulfonic acid, alkyl sulfate ester, alkyl ether sulfate ester, alkyl carboxylic acid, perfluoroalkyl sulfonic acid, monoalkyl phosphoric acid, and these Examples include salt.
- Nonionic surfactants include poly (oxyethylene) alkyl ether, poly (oxyethylene) fatty acid ester, polyethylene glycol, polyoxyethylene polyoxypropylene ether, glycerin fatty acid ester, acetylene diol, acetylene glycol, and the like. Oxyethylene) alkyl ether, poly (oxyethylene) fatty acid ester, acetylene diol and the like are preferable.
- Etching unevenness due to foam is likely to occur when the copper oxide etchant is highly foamable, so it is also effective to use a low foaming surfactant or a defoaming agent at the same time. It is.
- the etching rate can be controlled by adjusting the concentration of the chelating agent. That is, if the chelating agent concentration is increased, the etching rate is increased. Conversely, if the chelating agent concentration is decreased, the etching rate is decreased.
- concentration of the chelating agent is preferably 0.00001% by mass or more and 10% by mass or less, more preferably 0.00001% by mass or more and 1% by mass or less with respect to the total copper oxide etching solution.
- the content is most preferably not less than 01% by mass and not more than 1% by mass.
- the amino acid is preferably 0.01% by mass or more and 10% by mass or less, more preferably 0.1% by mass or more and 10% by mass or less, and most preferably 0.1% by mass or more and 3% by mass or less.
- the oxidizing agent in the present invention is used for adjusting the potential of the etching solution. If the concentration is too low, the etching is difficult to proceed, and if it is too high, the etching selectivity is lowered. From the above viewpoint, the concentration of the oxidizing agent is preferably 0.01% by mass or more and 1% by mass or less, and more preferably 0.1% by mass or more and 1% by mass or less with respect to the total etching solution. .
- the surfactant in the present invention is used to improve wettability and permeability of the etching solution. If the amount is extremely small, the effect is thin. On the other hand, if the concentration is too high, foaming becomes remarkable, which causes etching unevenness and the like.
- the concentration of the surfactant is preferably 0.00001% by mass or more and 1% by mass or less, more preferably 0.0001% by mass or more and 0.1% by mass or less, based on the total etching solution. The content is most preferably not less than 01% by mass and not more than 0.1% by mass.
- the pH of the etching solution for copper oxide according to the present invention generally takes a value of 1 or more and 11 or less depending on the type of chelating agent, but the effect is lost even if an arbitrary acid or alkali is added and the pH is changed within this range. I can't. However, if an acid or alkali that promotes or inhibits complex formation, or an acid or alkali that has an oxidation or reduction action that greatly changes the potential, the desired effect may not be obtained. In addition, when the pH is greatly out of the range of 1 to 11, etching proceeds by a different mechanism, and a desired effect may not be obtained.
- Preferred acids and alkalis that satisfy the above conditions include hydrochloric acid, sulfuric acid, nitric acid, ammonia, potassium hydroxide, sodium hydroxide, and tetramethylammonium hydroxide.
- hydrochloric acid, sulfuric acid, ammonia, tetrahydroxide Methylammonium is particularly preferred.
- the method for causing the copper oxide etchant to act on the resist is not particularly limited, and the resist may be immersed in the copper oxide etchant, or the etchant may be sprayed onto the resist.
- the etching rate can be increased by increasing the amount of the liquid that hits the resist per unit time by circulating the liquid or operating the resist.
- the etching rate can be increased by increasing the liquid discharge pressure when the copper oxide etchant is sprayed onto the resist, but if the discharge pressure is too high, the etching selectivity and uniformity may be reduced. is there. Further, if the discharge pressure is too small, the sprayed liquid does not act evenly, and the etching uniformity may be reduced.
- the discharge pressure is preferably 0.005 MPa or more and 0.15 MPa or less, particularly preferably 0.01 MPa or more and 0.10 MPa or less, and most preferably 0.01 MPa or more and 0.05 MPa or less.
- a method such as moving a nozzle or rotating a resist alone or in combination because etching proceeds uniformly.
- Any type of nozzle can be used for spraying, such as line slit, full cone nozzle, hollow cone nozzle, flat nozzle, uniform flat nozzle, solid nozzle, etc. It can be selected according to.
- a plurality of nozzles may be used side by side, and the nozzle may be a one-fluid nozzle or a two-fluid nozzle.
- the temperature at which the copper oxide etchant acts on the resist can be set arbitrarily as long as it avoids the range that causes the copper oxide etchant to freeze, boil, volatilize at a rate where the concentration changes extremely, or the components and resist in the copper oxide etchant to decompose. is there.
- the temperature range is preferably 0 ° C. or higher and 80 ° C. or lower, more preferably 10 ° C. or higher and 60 ° C. or lower, further preferably 10 ° C. or higher and 40 ° C. or lower, and most preferably 20 ° C. or higher and 40 ° C. or lower.
- the copper oxide etchant When impurities such as insoluble fine powder are present in the copper oxide etchant when the copper oxide etchant is allowed to act on the resist, it may cause unevenness particularly when etching a fine pattern. It is preferable to filter the copper oxide etching solution in advance.
- the material of the filter used for filtration can be arbitrarily selected as long as it does not react with the copper oxide etchant, and examples thereof include PFA and PTFE.
- the coarseness of the filter may be selected according to the fineness of the pattern, but is generally 0.2 ⁇ m or less, more preferably 0.1 ⁇ m or less.
- spraying is preferable from immersion, and it is desirable to make the etching solution disposable when the copper oxide etching solution is sprayed onto the resist.
- reusing the copper oxide etchant it is preferable to remove the eluted components.
- the material and shape of the resist base material to which the copper oxide etchant according to the present invention is applied are not particularly limited. However, it is preferable that the material is excellent in surface smoothness and workability, and examples of such a material include glass, silicon, silicon dioxide, aluminum, titanium, copper, silver, and gold. Glass, silicon, silicon dioxide, aluminum, titanium and copper are particularly preferred.
- the shape may be a two-dimensional shape such as a flat plate or a three-dimensional shape such as a roll.
- An etching method includes a thermal decomposition step of thermally decomposing copper oxide in a predetermined region of a copper oxide-containing layer containing copper oxide, and supplying the copper oxide-containing etchant to the copper oxide-containing layer. And an etching step of removing copper oxide in a predetermined region thermally decomposed from the copper oxide-containing layer.
- the copper oxide in the predetermined region of the copper oxide layer is thermally decomposed by applying heat to the predetermined region of the copper oxide-containing layer at a predetermined temperature or higher.
- the temperature in the predetermined region of the copper oxide-containing layer becomes a Gaussian distribution (see FIG. 2), so that only the part where the temperature exceeds the predetermined temperature is reacted. It is possible to proceed and thermally decompose a range smaller than the spot diameter of the laser beam.
- the thermal decomposition is not limited to laser light as long as the copper oxide can be decomposed by applying heat at a predetermined temperature or higher to a predetermined region of the copper oxide-containing layer.
- the copper oxide-containing layer is supplied with the copper oxide-containing etchant to dissolve and remove copper oxide in a predetermined region of the copper oxide-containing layer.
- the copper oxide-containing layer after the pyrolysis step contains copper oxide that has not been pyrolyzed and copper oxide whose oxidation number has been reduced by pyrolysis. Since the chelating agent in the copper oxide etchant selectively chelates with the copper oxide whose oxidation number has decreased due to thermal decomposition, the copper oxide in the copper oxide region thermally decomposed from the copper oxide-containing layer It can be selectively dissolved and removed.
- the etching method according to the present invention preferably includes a step of cleaning the etching layer (copper oxide-containing layer) and a step of cleaning the substrate and the etching layer after etching.
- FIG. 3 shows the results of thermogravimetric measurement of copper (II) oxide.
- thermogravimetric measurement is performed on the copper (II) oxide powder, heat absorption due to the reduction of copper (II) oxide is confirmed at 1050 ° C. (see DTA in FIG. 3), and the weight derived from the accompanying oxygen release Decrease is observed (see TG in FIG. 3). From the weight reduction rate, it can be seen that the valence of copper oxide has decreased from 2 (before heating) to almost 1 (after heating). From this result, it can be seen that copper (II) oxide is reduced by heating to reduce the oxidation number, and a copper oxide containing copper (I) oxide as a main component is generated.
- FIG. 3 shows the results of thermogravimetric measurement of copper (II) oxide.
- FIG. 4 shows the measurement results of X-ray diffraction of copper oxide (I) and copper oxide (II).
- X-ray diffraction before and after heating of the copper (II) oxide powder is measured, a peak attributed to copper (II) oxide is observed at room temperature, whereas when heated to 1000 ° C., it is attributed to copper (II) oxide. Peak disappears and only the peak attributed to copper (I) oxide is observed (FIG. 4). From this result, it can be seen that the valence of copper (II) oxide decreases and changes to copper (I) oxide by heating.
- Example 1 A copper oxide film was formed on a 50 mm ⁇ glass flat plate substrate using a sputtering method under the following conditions.
- Target Copper (II) oxide (3 inches ⁇ )
- Gas type Mixed gas of argon and oxygen (ratio 95: 5)
- ⁇ Various shapes and patterns can be produced by modulating the laser intensity during exposure, but in the experiment, a continuous groove shape was used as a pattern to facilitate evaluation of the interface after etching.
- the shape to be formed may be an isolated circular or elliptical shape depending on the intended application, and the present invention is not limited by the exposure shape.
- the ratio of the groove depth after etching to the original film thickness is in the range of 0.6 to 1, That is, in the case of the present embodiment, it can be said that the etching progresses selectively when the groove depth is in the range of 12 nm to 20 nm with respect to the film thickness of 20 nm. Further, when the ratio of the groove depth after etching to the original film thickness is in the range of 0.8 to 1, it can be said that particularly good selectivity is shown, and in the range of 0.9 to 1 If so, it can be said that it shows extremely good selectivity.
- the copper oxide sample exposed on the said conditions was etched with the etching liquid for copper oxides prepared on the following conditions.
- the pH of the etching solution was 6.5.
- the concentration of the chelating agent in the etching solution was 3% by mass.
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 16 minutes.
- an AFM atomic force microscope
- An atomic force microscope (VN-8000, manufactured by Keyence Corporation) was used for AFM measurement.
- VN-8000 atomic force microscope
- the groove width was 88 nm with respect to the pitch of 260 nm. From the above results, it was shown that only the copper oxide whose structure and composition were changed by the thermal reaction due to the exposure was selectively etched, and the copper oxide that was not exposed was not etched.
- Example 2 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions.
- the pH of the etching solution was 6.4.
- the concentration of the chelating agent in the etching solution was 3% by mass.
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 30 minutes. Next, an AFM image of the etched copper oxide film was measured (FIG. 6). As a result, a periodic groove shape having a groove depth of 20.0 nm was observed. The groove width was 80 nm with respect to the pitch of 260 nm.
- Example 3 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions.
- the pH of the etching solution was 3.7.
- the concentration of the chelating agent in the etching solution was 3% by mass.
- Ornithine hydrochloride 0.9g 30 g of water
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 30 minutes. Next, an AFM image of the etched copper oxide film was measured (FIG. 7). As a result, a periodic groove shape having a groove depth of 20.0 nm was observed. The groove width was 85 nm with respect to the pitch of 260 nm.
- Example 4 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions.
- the pH of the etching solution was 6.7.
- the concentration of the chelating agent in the etching solution was 3% by mass. Lysine 0.9g 30 g of water
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 30 minutes. Next, an AFM image of the etched copper oxide film was measured (FIG. 8). As a result, a periodic groove shape having a groove depth of 20.0 nm was observed. The groove width was 89 nm with respect to the pitch of 260 nm.
- Example 5 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions.
- the pH of the etching solution was 6.5.
- the concentration of the chelating agent in the etching solution was 3% by mass.
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 30 minutes. Next, an AFM image of the etched copper oxide film was measured (FIG. 9). As a result, a periodic groove shape having a groove depth of 20.0 nm was observed. The groove width was 82 nm with respect to the pitch of 260 nm.
- Example 6 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the same conditions as in Example 1. Etching was performed by spraying a copper oxide etchant to the copper oxide at 23 ° C. for 15 minutes using a line slit nozzle. Next, an AFM image of the etched copper oxide film was measured. As a result, a periodic groove shape having a groove depth of 20.0 nm was observed. The groove width was 98 nm with respect to the pitch of 260 nm.
- Example 7 A copper oxide film formed under the same conditions as in Example 1 was exposed under the following conditions.
- Semiconductor laser wavelength for exposure 405 nm
- Lens numerical aperture 0.85
- Exposure laser power 1-10mW
- Feed pitch 240nm
- the copper oxide sample exposed on the said conditions was etched with the etching liquid prepared on the following conditions.
- the pH of the etching solution was 6.5.
- the concentration of the chelating agent in the etching solution was 3% by mass.
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 16 minutes. Next, an AFM (atomic force microscope) image of the etched copper oxide film was measured. As a result, a periodic groove shape having a groove depth of 19.6 nm was observed (FIG. 10). The groove width was 88 nm with respect to the pitch of 240 nm. From the above results, it was shown that only the copper oxide whose structure and composition were changed by the thermal reaction due to the exposure was selectively etched, and the copper oxide that was not exposed was not etched.
- Example 8 Copper oxide formed and exposed under the same conditions as in Example 7 was etched with an etchant prepared under the following conditions.
- the pH of the etching solution was 6.4.
- the concentration of the chelating agent in the etching solution was 1% by mass.
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 30 minutes. Next, an AFM image of the etched copper oxide film was measured. As a result, a periodic groove shape having a groove depth of 19.8 nm was observed. The groove width was 107 nm with respect to the pitch of 260 nm.
- Example 9 Copper oxide formed and exposed under the same conditions as in Example 7 was etched with an etchant prepared under the following conditions.
- the pH of the etching solution was 6.2.
- the concentration of the chelating agent in the etching solution was 0.5% by mass.
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 60 minutes. Next, an AFM image of the etched copper oxide film was measured. As a result, a periodic groove shape having a groove depth of 20.0 nm was observed. The groove width was 109 nm with respect to the pitch of 240 nm.
- Example 10 Copper oxide formed and exposed under the same conditions as in Example 7 was etched with an etchant prepared under the following conditions.
- the pH of the etching solution was 6.7.
- the concentration of the chelating agent in the etching solution was 0.5% by mass. Lysine 0.15g 30 g of water
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 90 minutes. Next, an AFM image of the etched copper oxide film was measured. As a result, a periodic groove shape having a groove depth of 19.9 nm was observed. For a pitch of 240 nm, the groove width was 115 nm.
- Example 11 Copper oxide formed and exposed under the same conditions as in Example 7 was etched with an etching solution for copper oxide prepared under the same conditions as in Example 7. Etching was performed by spraying the etching solution onto copper oxide using a line slit nozzle at 23 ° C. for 15 minutes. Next, an AFM image of the etched copper oxide film was measured. As a result, a periodic groove shape having a groove depth of 20.0 nm was observed. The groove width was 98 nm with respect to the pitch of 240 nm.
- Example 12 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions.
- Adekatol SO-135 is a nonionic surfactant manufactured by Adeka.
- the pH of the etching solution was 4.6.
- the concentration of the chelating agent in the etching solution was 0.6% by mass.
- Ethylenediaminetetraacetic acid disodium salt 1.7 g 30% hydrogen peroxide solution 1.9g Adecatol SO-135 0.30g 300 g of water
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 8 minutes. Next, an AFM image of the etched copper oxide film was measured. As a result, a periodic groove shape having a groove depth of 16.5 nm was observed. The groove width was 100 nm with respect to the pitch of 260 nm.
- Example 13 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions.
- the pH of the etching solution was 7.5.
- the concentration of the chelating agent in the etching solution was 0.5% by mass.
- Trisodium citrate salt 1.4g 30% hydrogen peroxide solution 1.9g Adecatol SO-135 0.40g 300 g of water
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 30 minutes. Next, an AFM image of the etched copper oxide was measured. As a result, a periodic groove shape having a groove depth of 20.0 nm was observed. The groove width was 82 nm with respect to the pitch of 260 nm.
- Example 14 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions.
- the pH of the etching solution was 6.0.
- the concentration of the chelating agent in the etching solution was 0.3% by mass.
- Glycine 1.6g 30% hydrogen peroxide solution 1.9g Adecatol SO-135 0.40g 300 g of water
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 16 minutes. Next, an AFM image of the etched copper oxide was measured. As a result, a periodic groove shape having a groove depth of 20.0 nm was observed. The groove width was 100 nm with respect to the pitch of 260 nm.
- Example 15 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions.
- the pH of the etching solution was 4.6.
- the concentration of the chelating agent in the etching solution was 0.5% by mass.
- Trisodium citrate salt 1.4g 30% hydrogen peroxide solution
- Adecatol SO-135 0.40g 300 g of water Hydrochloric acid was added until pH 4.6.
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 30 minutes. Next, an AFM image of the etched copper oxide was measured. As a result, a periodic groove shape having a groove depth of 20.0 nm was observed. The groove width was 92 nm with respect to the pitch of 260 nm.
- Example 16 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions.
- the pH of the etching solution was 5.3.
- the concentration of the chelating agent in the etching solution was 0.006% by mass.
- Ethylenediaminetetraacetic acid disodium salt 0.017g 30% hydrogen peroxide solution 1.9g Adecatol SO-135 0.40g 300 g of water
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 90 minutes. Next, an AFM image of the etched copper oxide was measured. As a result, a periodic groove shape having a groove depth of 15.2 nm was observed. The groove width was 110 nm with respect to the pitch of 260 nm.
- Example 17 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions.
- the pH of the etching solution was 4.0.
- the concentration of the chelating agent in the etching solution was 5% by mass.
- Ethylenediaminetetraacetic acid disodium salt 17g 30% hydrogen peroxide solution 1.9g
- Adecatol SO-135 0.40g 300 g of water
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 10 minutes. Next, an AFM image of the etched copper oxide was measured. As a result, a periodic groove shape having a groove depth of 13.2 nm was observed. The groove width was 155 nm with respect to the pitch of 260 nm.
- Example 18 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions.
- the pH of the etching solution was 4.5.
- the concentration of the chelating agent in the etching solution was 0.6% by mass.
- Ethylenediaminetetraacetic acid disodium salt 1.7 g 30% hydrogen peroxide solution 0.10g
- Adecatol SO-135 0.40g 300 g of water
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 60 minutes. Next, an AFM image of the etched copper oxide was measured. As a result, a periodic groove shape having a groove depth of 18.5 nm was observed. The groove width was 97 nm with respect to the pitch of 260 nm.
- Example 19 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions.
- the pH of the etching solution was 4.6.
- the concentration of the chelating agent in the etching solution was 0.6% by mass.
- Ethylenediaminetetraacetic acid disodium salt 1.7 g 30% hydrogen peroxide solution
- Adecatol SO-135 0.0010g 300 g of water
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 60 minutes. Next, an AFM image of the etched copper oxide was measured. As a result, a periodic groove shape having a groove depth of 16.0 nm was observed. The groove width was 80 nm with respect to the pitch of 260 nm.
- Example 20 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions.
- the pH of the etching solution was 2.5.
- the concentration of the chelating agent in the etching solution was 0.5% by mass.
- Citric acid 1.4g 30% hydrogen peroxide solution 1.9g Adecatol SO-135 0.40g 300 g of water
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 8 minutes. Next, an AFM image of the etched copper oxide was measured (FIG. 11). As a result, a periodic groove shape having a groove depth of 20.0 nm was observed. The groove width was 85 nm with respect to the pitch of 260 nm.
- Example 21 Film formation and exposure were performed under the same conditions as in Example 1, and copper oxide having a mixed valence was etched with an etching solution prepared under the same conditions as in Example 1. Etching was performed at 23 ° C. for 10 minutes by injecting an etching solution onto copper oxide at a discharge pressure of 0.03 MPa using a line slit nozzle. Next, an AFM image of the etched copper oxide was measured. As a result, a periodic groove shape having a groove depth of 14.2 nm was observed. The groove width was 142 nm with respect to the pitch of 260 nm.
- Example 22 A copper oxide film was formed on an aluminum roll substrate having a length of 100 mm and a diameter of 120 mm using a sputtering method under the following conditions.
- Target Copper (II) oxide (3 inches ⁇ )
- Gas type Mixed gas of argon and oxygen (ratio 9: 1)
- the copper oxide mixed with valence was exposed and etched with an etching solution prepared under the same conditions as in Example 1. Etching was performed at 23 ° C. for 10 minutes by injecting an etchant into copper oxide mixed with valences at a discharge pressure of 0.02 MPa using a line slit. Next, an AFM image of the etched copper oxide was measured. As a result, a periodic groove shape having a groove depth of 14.8 nm was observed. The groove width was 135 nm with respect to the pitch of 260 nm.
- Example 23 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions.
- the pH of the etching solution was 1.7.
- the concentration of the chelating agent in the etching solution was 0.3% by mass.
- Oxalic acid 0.9g 30% hydrogen peroxide solution 1.9g Adecatol SO-135 0.40g 300 g of water
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 1 minute. Next, an AFM image of the etched copper oxide film was measured (FIG. 12). As a result, a periodic groove shape having a groove depth of 20.0 nm was observed. The groove width was 100 nm with respect to the pitch of 260 nm.
- Example 24 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions.
- the pH of the etching solution was 4.6.
- the concentration of the chelating agent in the etching solution was 0.3% by mass.
- Sodium oxalate 1.0g 30% hydrogen peroxide solution 1.9g Adecatol SO-135 0.40g 300 g of water
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 4 minutes. Next, an AFM image of the etched copper oxide was measured. As a result, a periodic groove shape having a groove depth of 20.0 nm was observed. The groove width was 82 nm with respect to the pitch of 260 nm.
- Example 25 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions.
- the pH of the etching solution was 4.6.
- the concentration of the chelating agent in the etching solution was 0.3% by mass.
- Oxalic acid 0.9g 30% hydrogen peroxide solution 1.9g
- Adecatol SO-135 0.40g 300 g of water 10% aqueous sodium hydroxide solution was added until pH 4.6.
- Etching was performed by immersing the copper oxide in an etching solution for copper oxide at 23 ° C. for 4 minutes. Next, an AFM image of the etched copper oxide was measured. As a result, a periodic groove shape having a groove depth of 19.0 nm was observed. The groove width was 98 nm with respect to the pitch of 260 nm.
- Example 26 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the same conditions as in Example 16. Etching was performed at 23 ° C. for 0.5 minutes by spraying the etching solution onto copper oxide at a discharge pressure of 0.03 MPa using a line slit nozzle. Next, an AFM image of the etched copper oxide was measured. As a result, a periodic groove shape having a groove depth of 18.2 nm was observed. The groove width was 97 nm with respect to the pitch of 260 nm.
- Example 27 A copper oxide film was formed on an aluminum roll substrate having a length of 100 mm and a diameter of 120 mm using a sputtering method under the following conditions.
- Target Copper (II) oxide (3 inches ⁇ )
- Gas type Mixed gas of argon and oxygen (ratio 9: 1)
- the copper oxide was etched with an etching solution for copper oxide prepared under the same conditions as in Example 16. Etching was performed at 23 ° C. for 0.5 minutes by injecting an etchant into copper oxide having mixed valences at a discharge pressure of 0.02 MPa using a line slit. Next, an AFM image of the etched copper oxide was measured. As a result, a periodic groove shape having a groove depth of 19.6 nm was observed. The groove width was 96 nm with respect to the pitch of 260 nm.
- Example 1 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions. 6.6 g of copper sulfate pentahydrate 300 g of water Aqueous ammonia was added until pH 9 was reached.
- Etching was performed by immersing for 60 minutes at 23 ° C., and AFM images were measured. However, no groove shape was observed, and this etching solution selectively etches only one from a mixture of copper oxides having different oxidation numbers. I could't.
- Example 2 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions.
- the pH of the etching solution was 6.0.
- the concentration of the chelating agent in the etching solution was 0.0000003 mass%.
- Ethylenediaminetetraacetic acid disodium salt 0.001 g 30% hydrogen peroxide solution 1900g Adecatol SO-135 400g 300 kg of water
- Etching was performed by immersing at 23 ° C. for 120 minutes, and AFM images were measured. However, no groove shape was observed, and this etching solution selectively etches only one from a mixture of copper oxides having different oxidation numbers. I could't.
- Example 3 Copper oxide formed and exposed under the same conditions as in Example 1 was etched with an etching solution for copper oxide prepared under the following conditions.
- the pH of the etching solution was 4.4.
- the concentration of the chelating agent in the etching solution was 0.5% by mass.
- Ethylenediaminetetraacetic acid disodium salt 1.7 g 19% of 30% hydrogen peroxide solution
- Adecatol SO-135 0.40g 300 g of water
- Etching was carried out at 23 ° C. for 2 minutes by injecting an etching solution into copper oxide having mixed valences at a discharge pressure of 0.3 MPa using a line slit. Next, an AFM image of the etched copper oxide was measured. As a result, although a periodic groove shape having a groove depth of 5.8 nm was observed in a certain place, no groove shape was observed in another place, resulting in a decrease in etching selectivity and uniformity.
- Example 5 Film formation and exposure were performed under the same conditions as in Example 1, and copper oxide having a mixed valence was etched with an etching solution prepared under the following conditions.
- the pH of the etching solution was 5.0.
- the concentration of the chelating agent in the etching solution was 0.0000003 mass%.
- Oxalic acid 0.00001g 19% of 30% hydrogen peroxide solution Adecatol SO-135 4.0g 3000g of water
- Etching was performed by immersing at 23 ° C. for 120 minutes, and AFM images were measured. However, no groove shape was observed, and this etching solution selectively etches only one from a mixture of copper oxides having different oxidation numbers. I could't.
- Example 6 Film formation and exposure were performed under the same conditions as in Example 1, and copper oxide having a mixed valence was etched with an etching solution prepared under the following conditions.
- the pH of the etching solution was 1.6.
- the concentration of the chelating agent in the etching solution was 0.3% by mass.
- Oxalic acid 0.9g 19% of 30% hydrogen peroxide solution Adecatol SO-135 0.40g 300 g of water
- Example 7 Film formation and exposure were performed under the same conditions as in Example 27, and copper oxide having a mixed valence was etched with an etching solution adjusted under the same conditions as in Example 23.
- Etching was carried out at 23 ° C. for 0.5 minutes by injecting the etching solution into copper oxide having mixed valences at a discharge pressure of 0.3 MPa using a line slit. Next, an AFM image of the etched copper oxide was measured. As a result, a periodic groove shape having a groove depth of 2.6 nm was observed at a certain location, but no groove shape was observed at another location, resulting in a decrease in etching selectivity and uniformity.
- the copper oxide etchant according to the present invention is useful for producing a fine pattern because it can selectively etch exposed and unexposed portions when exposed to laser light using copper oxide as a thermal reaction resist. Applications in various fields such as optical materials are possible.
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Abstract
Description
本発明に係る酸化銅用エッチング液のエッチング対象は銅の酸化物であり、例えば、熱反応型レジスト材料として銅の酸化物を主成分とする酸化銅含有層を用いてレーザー光で露光した場合に、露光・未露光部を選択的にエッチングする際に用いる。
以下、本発明の効果を明確にするために行った実施例について説明するが、本発明はこの実施例によりなんら制限されるものではない。
図3に酸化銅(II)の熱重量測定結果を示す。酸化銅(II)の粉末に対して熱重量測定を行うと、1050℃において、酸化銅(II)の還元による吸熱が確認され(図3のDTA参照)、それに伴う酸素の放出に由来する重量の減少が観測される(図3のTG参照)。重量の減少割合から見積もって、酸化銅の価数は、2(加熱前)から、ほぼ1(加熱後)まで減少していることが分かる。この結果より、加熱によって酸化銅(II)が還元されて酸化数が減少し、酸化銅(I)を主成分とする含む銅の酸化物が生成することが分かる。尚、図3では価数1(酸化銅(I)、CuO0.5)に減少後、再酸化が生じ価数1.5(CuO0.65)となっている。しかしながら、後述するX線回折の結果から殆どが酸化銅(I)の状態であると推定している。
本発明に係る酸化銅用エッチング液を用いた際に、酸化銅の価数によって溶解性が変化することを検討した結果を以下に示す。3質量%のグリシン水溶液30gに対し、粉末の酸化銅(II)及び酸化銅(I)をそれぞれ投入し、23℃で30分間攪拌した際に、溶解した銅のモル数を求めた。その結果、酸化銅(I)が銅換算で0.43mmol溶解したのに対し、酸化銅(II)は0.10mmol溶解したのみであった。したがって、本発明に係る酸化銅用エッチング液によって、価数の異なる酸化銅が混在している状態において、一方のみを選択的に溶解させることが可能であることがわかる。
50mmφのガラス平板基板上に、スパッタリング法を用いて、下記の条件にて酸化銅を成膜した。
ターゲット:酸化銅(II)(3インチφ)
電力(W):RF100
ガス種類:アルゴンと酸素の混合ガス(比率95:5)
圧力(Pa):0.5
膜厚(nm):20
露光用半導体レーザー波長:405nm
レンズ開口数:0.85
露光レーザーパワー:1mW~10mW
送りピッチ:260nm
グリシン 0.9g
水 30g
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。エッチング液のpHは6.4だった。エッチング液中のキレート剤の濃度は3質量%だった。
アラニン 0.9g
水 30g
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。エッチング液のpHは3.7だった。エッチング液中のキレート剤の濃度は3質量%だった。
オルニチン塩酸塩 0.9g
水 30g
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。エッチング液のpHは6.7だった。エッチング液中のキレート剤の濃度は3質量%だった。
リジン 0.9g
水 30g
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。エッチング液のpHは6.5だった。エッチング液中のキレート剤の濃度は3質量%だった。
プロリン 0.9g
水 30g
実施例1と同様の条件で成膜、露光した酸化銅を実施例1と同様の条件で作製した酸化銅用エッチング液によってエッチングした。エッチングは23℃において15分間、酸化銅用エッチング液を酸化銅に対して、ラインスリットノズルを用いて噴射することで行った。次に、エッチングした酸化銅膜のAFM像を測定した。その結果、溝深さ20.0nmの周期的溝形状が観測された。ピッチ260nmに対して、溝幅は98nmであった。
実施例1と同様の条件で成膜した酸化銅膜を以下の条件にて露光した。
露光用半導体レーザー波長:405nm
レンズ開口数:0.85
露光レーザーパワー:1~10mW
送りピッチ:240nm
グリシン 0.9g
水 30g
実施例7と同様の条件で成膜、露光した酸化銅を下記条件にて調製したエッチング液によってエッチングした。エッチング液のpHは6.4だった。エッチング液中のキレート剤の濃度は1質量%だった。
アラニン 0.3g
水 30g
実施例7と同様の条件で成膜、露光した酸化銅を下記条件にて調製したエッチング液によってエッチングした。エッチング液のpHは6.2だった。エッチング液中のキレート剤の濃度は0.5質量%だった。
メチオニン 0.15g
水 30g
実施例7と同様の条件で成膜、露光した酸化銅を下記条件にて調製したエッチング液によってエッチングした。エッチング液のpHは6.7だった。エッチング液中のキレート剤の濃度は0.5質量%だった。
リジン 0.15g
水 30g
実施例7と同様の条件で成膜、露光した酸化銅を実施例7と同様の条件で作製した酸化銅用エッチング液によってエッチングした。エッチングは23℃において15分間、エッチング液を酸化銅に対して、ラインスリットノズルを用いて噴射することで行った。次に、エッチングした酸化銅膜のAFM像を測定した。その結果、溝深さ20.0nmの周期的溝形状が観測された。ピッチ240nmに対して、溝幅は98nmであった。
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。なお、アデカトールSO-135は、アデカ社製のノニオン性界面活性剤である。エッチング液のpHは4.6だった。エッチング液中のキレート剤の濃度は0.6質量%だった。
エチレンジアミン四酢酸二ナトリウム塩 1.7g
30%過酸化水素水 1.9g
アデカトールSO-135 0.30g
水 300g
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。エッチング液のpHは7.5だった。エッチング液中のキレート剤の濃度は0.5質量%だった。
クエン酸三ナトリウム塩 1.4g
30%過酸化水素水 1.9g
アデカトールSO-135 0.40g
水 300g
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。エッチング液のpHは6.0だった。エッチング液中のキレート剤の濃度は0.3質量%だった。
グリシン 1.6g
30%過酸化水素水 1.9g
アデカトールSO-135 0.40g
水 300g
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。エッチング液のpHは4.6だった。エッチング液中のキレート剤の濃度は0.5質量%だった。
クエン酸三ナトリウム塩 1.4g
30%過酸化水素水 1.9g
アデカトールSO-135 0.40g
水 300g
塩酸 pH4.6になるまで加えた。
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。エッチング液のpHは5.3だった。エッチング液中のキレート剤の濃度は0.006質量%だった。
エチレンジアミン四酢酸二ナトリウム塩 0.017g
30%過酸化水素水 1.9g
アデカトールSO-135 0.40g
水 300g
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。エッチング液のpHは4.0だった。エッチング液中のキレート剤の濃度は5質量%だった。
エチレンジアミン四酢酸二ナトリウム塩 17g
30%過酸化水素水 1.9g
アデカトールSO-135 0.40g
水 300g
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。エッチング液のpHは4.5だった。エッチング液中のキレート剤の濃度は0.6質量%だった。
エチレンジアミン四酢酸二ナトリウム塩 1.7g
30%過酸化水素水 0.10g
アデカトールSO-135 0.40g
水 300g
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。エッチング液のpHは4.6だった。エッチング液中のキレート剤の濃度は0.6質量%だった。
エチレンジアミン四酢酸二ナトリウム塩 1.7g
30%過酸化水素水 1.9g
アデカトールSO-135 0.0010g
水 300g
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。エッチング液のpHは2.5だった。エッチング液中のキレート剤の濃度は0.5質量%だった。
クエン酸 1.4g
30%過酸化水素水 1.9g
アデカトールSO-135 0.40g
水 300g
実施例1と同様の条件で製膜、露光し、価数の混在している酸化銅を実施例1と同様の条件で作製したエッチング液によってエッチングした。エッチングは23℃において10分間、エッチング液を酸化銅に対して、ラインスリットノズルを用いて吐出圧0.03MPaで噴射することで行った。次に、エッチングした酸化銅のAFM像を測定した。その結果、溝深さ14.2nmの周期的溝形状が観測された。ピッチ260nmに対して、溝幅は142nmであった。
長さ100mm、120mmφのアルミニウムロール基板上に、スパッタリング法を用いて、下記の条件にて酸化銅を製膜した。
ターゲット:酸化銅(II)(3インチφ)
電力(W):RF100
ガス種類:アルゴンと酸素の混合ガス(比率9:1)
圧力(Pa):0.5
膜厚(nm):20
露光用半導体レーザー波長:405nm
レンズ開口数:0.85
露光レーザーパワー:1mW~10mW
送りピッチ:260nm
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。エッチング液のpHは1.7だった。エッチング液中のキレート剤の濃度は0.3質量%だった。
シュウ酸 0.9g
30%過酸化水素水 1.9g
アデカトールSO-135 0.40g
水 300g
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。エッチング液のpHは4.6だった。エッチング液中のキレート剤の濃度は0.3質量%だった。
シュウ酸ナトリウム 1.0g
30%過酸化水素水 1.9g
アデカトールSO-135 0.40g
水 300g
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。エッチング液のpHは4.6だった。エッチング液中のキレート剤の濃度は0.3質量%だった。
シュウ酸 0.9g
30%過酸化水素水 1.9g
アデカトールSO-135 0.40g
水 300g
10%水酸化ナトリウム水溶液 pH4.6になるまで加えた。
実施例1と同様の条件で成膜、露光した酸化銅を実施例16と同様の条件で調製した酸化銅用エッチング液によってエッチングした。エッチングは23℃において0.5分間、エッチング液を酸化銅に対して、ラインスリットノズルを用いて吐出圧0.03MPaで噴射することで行った。次に、エッチングした酸化銅のAFM像を測定した。その結果、溝深さ18.2nmの周期的溝形状が観測された。ピッチ260nmに対して、溝幅は97nmであった。
長さ100mm、120mmφのアルミニウムロール基板上に、スパッタリング法を用いて、下記の条件にて酸化銅を製膜した。
ターゲット:酸化銅(II)(3インチφ)
電力(W):RF100
ガス種類:アルゴンと酸素の混合ガス(比率9:1)
圧力(Pa):0.5
膜厚(nm):20
露光用半導体レーザー波長:405nm
レンズ開口数:0.85
露光レーザーパワー:1mW~10mW
送りピッチ:260nm
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。
硫酸銅五水和物 6.6g
水 300g
アンモニア水 pH9になるまで加えた。
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。エッチング液のpHは6.0だった。エッチング液中のキレート剤の濃度は0.0000003質量%だった。
エチレンジアミン四酢酸二ナトリウム塩 0.001g
30%過酸化水素水 1900g
アデカトールSO-135 400g
水 300kg
実施例1と同様の条件で成膜、露光した酸化銅を下記条件にて調製した酸化銅用エッチング液によってエッチングした。エッチング液のpHは4.4だった。エッチング液中のキレート剤の濃度は0.5質量%だった。
エチレンジアミン四酢酸二ナトリウム塩 1.7g
30%過酸化水素水 19g
アデカトールSO-135 0.40g
水 300g
実施例1と同様の条件で成膜、露光した酸化銅を実施例12と同様の条件にて調整したエッチング液によりエッチングした。
実施例1と同様の条件で製膜、露光し、価数の混在している酸化銅を下記条件にて調製したエッチング液によってエッチングした。エッチング液のpHは5.0だった。エッチング液中のキレート剤の濃度は0.0000003質量%だった。
シュウ酸 0.00001g
30%過酸化水素水 19g
アデカトールSO-135 4.0g
水 3000g
実施例1と同様の条件で製膜、露光し、価数の混在している酸化銅を下記条件にて調製したエッチング液によってエッチングした。エッチング液のpHは1.6だった。エッチング液中のキレート剤の濃度は0.3質量%だった。
シュウ酸 0.9g
30%過酸化水素水 19g
アデカトールSO-135 0.40g
水 300g
実施例27と同様の条件で製膜、露光し、価数の混在している酸化銅を実施例23と同様の条件にて調整したエッチング液によりエッチングした。
Claims (7)
- 銅の酸化物を主成分とする酸化銅含有層において酸化数の異なる酸化銅を選択的にエッチングするための酸化銅用エッチング液であって、少なくともキレート剤、又はその塩を含むことを特徴とする酸化銅用エッチング液。
- 前記キレート剤が、アミノ酸としての、アラニン、アルギニン、アスパラギン、アスパラギン酸、システイン、グルタミン、グルタミン酸、グリシン、ヒスチジン、イソロイシン、ロイシン、リジン、メチオニン、オルニチン、フェニルアラニン、セリン、トレオニン、トリプトファン、チロシン、バリン、プロリン、及びその他のキレート剤としての、シュウ酸、エチレンジアミン四酢酸、ヒドロキシエチルエチレンジアミン三酢酸、ジヒドロキシエチルエチレンジアミン二酢酸、1,3-プロパンジアミン四酢酸、クエン酸、フマル酸、アジピン酸、コハク酸、リンゴ酸、酒石酸、バソクプロインスルホン酸、並びにそれらの塩からなる群より選択された少なくとも一種を含むことを特徴とする請求項1記載の酸化銅用エッチング液。
- 前記キレート剤が、少なくとも一種の前記アミノ酸を含むことを特徴とする請求項1又は請求項2記載の酸化銅用エッチング液。
- 前記アミノ酸が、グリシン、アラニン、オルニチン、及びリジンからなる群より選択された少なくとも一種を含むことを特徴とする請求項3記載の酸化銅用エッチング液。
- 酸化銅用エッチング液中の前記キレート剤の割合が0.00001質量%以上10質量%以下であることを特徴とする請求項1から請求項4のいずれかに記載の酸化銅用エッチング液。
- 請求項1から請求項5のいずれかに記載の酸化銅用エッチング液を用いるエッチング方法であって、銅の酸化物を含有する酸化銅含有層の所定の領域の銅の酸化物を熱分解する熱分解工程と、前記酸化銅含有層に前記酸化銅用エッチング液を供給し、前記酸化銅含有層から熱分解された所定の領域の銅の酸化物を除去するエッチング工程と、を含むことを特徴とするエッチング方法。
- 前記エッチング工程における前記酸化銅用エッチング液を作用させる際の液吐出圧が、0.005MPa以上0.15MPa以下であることを特徴とする請求項6に記載のエッチング方法。
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JP2012501699A JP5710585B2 (ja) | 2010-02-25 | 2011-01-14 | 酸化銅用エッチング液及びそれを用いたエッチング方法 |
EP11747093.0A EP2540801A4 (en) | 2010-02-25 | 2011-01-14 | COPPER OXIDE ENGRAVING AGENT AND ETCHING METHOD USING THE SAME |
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US13/579,490 US20130026134A1 (en) | 2010-02-25 | 2011-01-14 | Copper oxide etchant and etching method using the same |
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US20130026134A1 (en) | 2013-01-31 |
TW201139623A (en) | 2011-11-16 |
US20140091058A1 (en) | 2014-04-03 |
KR101510932B1 (ko) | 2015-04-10 |
CN102753651A (zh) | 2012-10-24 |
CN102753651B (zh) | 2014-09-10 |
TWI448539B (zh) | 2014-08-11 |
KR20120104339A (ko) | 2012-09-20 |
JPWO2011105129A1 (ja) | 2013-06-20 |
US9139771B2 (en) | 2015-09-22 |
CN103805202A (zh) | 2014-05-21 |
EP2540801A1 (en) | 2013-01-02 |
CN103805202B (zh) | 2018-05-18 |
EP2540801A4 (en) | 2013-05-08 |
JP5710585B2 (ja) | 2015-04-30 |
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