WO2020138121A1 - 塗工膜形成用組成物及び基板の製造方法 - Google Patents
塗工膜形成用組成物及び基板の製造方法 Download PDFInfo
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- WO2020138121A1 WO2020138121A1 PCT/JP2019/050710 JP2019050710W WO2020138121A1 WO 2020138121 A1 WO2020138121 A1 WO 2020138121A1 JP 2019050710 W JP2019050710 W JP 2019050710W WO 2020138121 A1 WO2020138121 A1 WO 2020138121A1
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- coating film
- cobalt
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- 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
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/11—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having cover layers or intermediate layers, e.g. subbing layers
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
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- 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
- G03F7/16—Coating processes; Apparatus therefor
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
Definitions
- the present invention relates to a coating film forming composition and a method for producing a substrate.
- a method of forming a cobalt-containing film on a substrate by chemical vapor deposition (CVD) and atomic layer deposition (ALD) using an organometallic precursor is used (WO 2011/017068). No.).
- the organometallic precursor used in the above conventional method for forming a cobalt-containing film has insufficient storage stability. Further, it takes a long time to form a cobalt-containing film having a film thickness of several tens of nm by CVD or ALD, and the productivity is low.
- the present invention has been made based on the above circumstances, and an object thereof is to provide a coating film forming composition having excellent storage stability and a method for producing a substrate.
- the invention made to solve the above problems is a cobalt-containing compound having no cobalt-carbon bond (hereinafter, also referred to as "[A] compound”) and a solvent (hereinafter, also referred to as "[B] solvent”).
- a coating film-forming composition containing and.
- Another invention made to solve the above problems comprises a step of directly or indirectly applying a composition to a substrate, wherein the composition comprises a cobalt-containing compound having no cobalt-carbon bond, a solvent, and a solvent.
- the composition comprises a cobalt-containing compound having no cobalt-carbon bond, a solvent, and a solvent.
- the coating film forming composition of the present invention has excellent storage stability. According to the method for producing a substrate of the present invention, by using the coating film forming composition, a cobalt-containing film having excellent conductivity and embedding property can be formed. Therefore, these can be suitably used in forming a cobalt-containing film in the fields of semiconductors, battery materials, antistatic fields, touch panel sensors and the like.
- the coating film forming composition contains the compound [A] and the solvent [B].
- the coating film forming composition may contain optional components as long as the effects of the present invention are not impaired.
- the coating film forming composition is used in the pattern forming method described later. Therefore, the coating film forming composition can be suitably used as a pattern forming composition.
- the coating film forming composition is used in the inversion pattern forming method described later. Therefore, the coating film forming composition can be preferably used as a composition for forming a reverse pattern.
- the compound [A] is a cobalt-containing compound having no cobalt-carbon bond.
- the coating film forming composition may contain two or more kinds of [A] compounds.
- "Cobalt-containing compound” refers to a compound containing a cobalt atom.
- the “cobalt-carbon bond” refers to a covalent bond or a coordinate bond between a cobalt atom and a carbon atom which a cobalt carbonyl complex, a cobalt cyano complex, a cobalt ene complex, a cobalt-alkyl complex, a cobalt-acyl complex or the like has.
- the coating film forming composition has excellent storage stability by using a compound having no cobalt-carbon bond as the [A] compound.
- the compound [A] has one or more cobalt atoms.
- examples of the valence of the cobalt atom in the compound [A] include 0 valence, 1 valence, 2 valence, and 3 valence. Of these, divalent or trivalent is preferable from the viewpoint of further improving storage stability.
- Examples of the [A] compound include a cobalt salt, a complex having cobalt and a ligand, a combination thereof, and the like.
- cobalt salt examples include nitrates, sulfates, phosphates, carboxylates, perchlorates, carbonates, oxoacid salts such as borate, thiocyanates, sulfamate, fluorides, chlorides, Examples thereof include halides such as bromide and iodide, and hydroxides.
- carboxylate examples include acetate, stearate, naphthenate, citrate, oxalate, succinate and the like. Among these, oxo acid salts are preferable, and nitrates, sulfates or carboxylates are more preferable, from the viewpoint of further improving storage stability.
- Examples of the ligand that constitutes the complex include a monodentate ligand and a polydentate ligand.
- Examples of the monodentate ligand include a hydroxo ligand, an amide ligand, a halogen ligand, an alkoxy ligand, an acyloxy ligand, a phosphine ligand, an amine ligand, and an ammonia ligand.
- amide ligand examples include an unsubstituted amide ligand (NH 2 ), a methylamide ligand (NHCH 3 ), a dimethylamide ligand (N(CH 3 ) 2 ), and a diethylamide ligand (N(C 2 H 5) 2), dipropyl amido ligand (N (C 3 H 7) 2) , and the like.
- halogen ligand examples include a fluorine ligand, a chlorine ligand, a bromine ligand, an iodine ligand and the like.
- alkoxy ligand examples include methoxy ligand, ethoxy ligand, propoxy ligand, butoxy ligand and the like.
- acyloxy ligand examples include acetoxy ligand, ethylyloxy ligand, butyryloxy ligand, t-butyryloxy ligand, t-amylyloxy ligand, n-hexanecarbonyloxy ligand, and n-octane. Carbonyloxy ligands and the like can be mentioned.
- amine ligands include methylamine ligand, dimethylamine ligand, piperidine ligand, morpholine ligand, pyridine ligand and the like.
- phosphine ligand examples include trimethylphosphine ligand, triethylphosphine ligand, tributylphosphine ligand, triphenylphosphine ligand and the like.
- polydentate ligand examples include an oxygen bidentate ligand, a nitrogen bidentate ligand, a nitrogen tridentate ligand, a nitrogen tetradentate ligand, a nitrogen bidentate oxygen bidentate ligand, and a nitrogen bidentate.
- An oxygen tetradentate ligand, a phosphorus bidentate ligand, etc. are mentioned.
- oxygen bidentate ligand examples include a dicarboxylic acid-derived ligand, a hydroxy acid ester-derived ligand, a ⁇ -diketone-derived ligand, a ⁇ -ketoester-derived ligand, and a ⁇ -dicarboxylic acid ester.
- examples thereof include a ligand derived from catechol and a ligand derived from catechol or a substitution product thereof.
- dicarboxylic acid examples include oxalic acid, malonic acid, succinic acid and the like.
- hydroxy acid ester examples include glycolic acid ester, lactic acid ester, 2-hydroxycyclohexane-1-carboxylic acid ester, salicylic acid ester and the like.
- ⁇ -diketones examples include 2,4-pentanedione, 3-methyl-2,4-pentanedione, 3-ethyl-2,4-pentanedione and the like.
- ⁇ -ketoesters examples include acetoacetic acid ester, ⁇ -alkyl-substituted acetoacetic acid ester, ⁇ -ketopentanoic acid ester, benzoylacetic acid ester, and 1,3-acetonedicarboxylic acid ester.
- ⁇ -dicarboxylic acid ester examples include malonic acid diester, ⁇ -alkyl-substituted malonic acid diester, ⁇ -cycloalkyl-substituted malonic acid diester, ⁇ -aryl-substituted malonic acid diester and the like.
- nitrogen bidentate ligand for example, a ligand derived from 2,2′-bipyridyl or a substituted product thereof, a ligand derived from 1,8-naphthyridine or a substituted product thereof, 2-(1H-pyrazole-1- Il) pyridine or a ligand derived from a substituted product thereof, 1,10-phenanthroline or a ligand derived from a substituted product thereof, ethylenediamine, propanediamine or butanediamine or a ligand derived from a substituted product thereof.
- the tridentate nitrogen ligand includes, for example, a ligand derived from 2,6-di(1H-pyrazol-1-yl)pyridine or a substituted product thereof, and a ligand derived from ⁇ , ⁇ ′, ⁇ ′′-tripyridyl or a substituted product thereof. Examples thereof include a ligand, a ligand derived from diethylenetriamine or a substituted product thereof, and a ligand derived from 1,4,7-triazacyclononane or a substituted product thereof.
- nitrogen tetradentate ligand for example, a ligand derived from phthalocyanine or a substituted product thereof, a ligand derived from naphthalocyanine or a substituted product thereof, a ligand derived from porphyrin or a substituted product thereof, a porphycene or a substituted product thereof , A ligand derived from triethylenetetramine or a substituted derivative thereof, a ligand derived from 1,4,7,10-tetraazacyclododecane or a substituted derivative thereof, 1,4,8,11-tetraaza Examples thereof include a ligand derived from cyclotetradecane or a substituted product thereof, a ligand derived from tris(2-aminoethyl)amine or a substituted product thereof, and the like.
- nitrogen bidentate oxygen bidentate ligand for example, a ligand derived from N,N′-bis(salicylidene)ethylenediamine or a substitution product thereof, N,N′-bis(3-hydroxy-2-butenylidene)ethylenediamine or Examples include ligands derived from the substitution products.
- the nitrogen bidentate oxygen tetradentate ligand includes, for example, a ligand derived from ethylenediaminetetraacetic acid.
- Examples of the phosphorus bidentate ligand include 1,1-bis(diphenylphosphino)methane, 1,2-bis(diphenylphosphino)ethane, 1,3-bis(diphenylphosphino)propane, and 2,2′.
- Examples thereof include diphosphine ligands such as -bis(diphenylphosphino)-1,1'-binaphthyl and 1,1'-bis(diphenylphosphino)ferrocene.
- the lower limit of the content ratio of the [A] compound is preferably 30% by mass, more preferably 50% by mass, and 60% by mass with respect to all components other than the solvent [B] in the coating film forming composition. More preferable.
- the content ratio may be 100% by mass.
- the lower limit of the content ratio of the [A] compound in the coating film forming composition is preferably 1% by mass, more preferably 5% by mass, further preferably 10% by mass, and particularly preferably 15% by mass.
- the upper limit of the content ratio is preferably 70% by mass, more preferably 50% by mass, further preferably 30% by mass, and particularly preferably 25% by mass.
- the solvent [B] can be used without particular limitation as long as it can dissolve or disperse the compound [A] and optional components contained as necessary.
- Examples of the [B] solvent include organic solvents (hereinafter, also referred to as “[b] organic solvent”), water and the like.
- Organic solvent refers to an organic compound that is liquid at 25°C.
- the lower limit of the content ratio of the [b] organic solvent in the [B] solvent is preferably 20% by mass, more preferably 50% by mass, and further preferably 70% by mass. 90 mass% is especially preferable.
- the content ratio of the [b] organic solvent in the [B] solvent may be 100% by mass.
- organic solvent [b] examples include alcohol solvents, ketone solvents, ether solvents, ester solvents, nitrogen-containing solvents and the like.
- the organic solvent [b] can be used alone or in combination of two or more.
- the alcohol solvent examples include monoalcohols such as methyl alcohol, ethyl alcohol, n-propyl alcohol and n-butyl alcohol, ethylene glycol, 1,2-propanediol, 1,2-butanediol, triethanolamine and diethylene glycol.
- Polyhydric alcohols such as glycerin, polyhydric alcohol partial ethers such as propylene glycol monomethyl ether and propylene glycol monoethyl ether, lactate esters such as ethyl lactate and butyl lactate, 2-hydrazinoethanol, 3-hydrazinopropanol And the like, and hydroxyketone hydrazones such as 1-hydroxy-2-propanone hydrazone and 1-hydroxy-2-butanone hydrazone.
- polyhydric alcohols such as glycerin, polyhydric alcohol partial ethers such as propylene glycol monomethyl ether and propylene glycol monoethyl ether, lactate esters such as ethyl lactate and butyl lactate, 2-hydrazinoethanol, 3-hydrazinopropanol And the like
- hydroxyketone hydrazones such as 1-hydroxy-2-propanone hydrazone and 1-hydroxy-2-butanone hydrazone.
- ketone solvents include chain ketones such as methyl ethyl ketone and methyl isobutyl ketone, and cyclic ketones such as cyclohexanone.
- ether solvents include chain ethers such as n-butyl ether and cyclic ethers such as tetrahydrofuran and 1,4-dioxane.
- ester solvents include carbonates such as diethyl carbonate, acetic acid esters such as methyl acetate and ethyl acetate, lactones such as ⁇ -butyrolactone, and polyhydric alcohol partial ethers such as diethylene glycol monomethyl ether acetate and propylene glycol monomethyl ether acetate. Examples thereof include carboxylates.
- nitrogen-containing solvent examples include chain nitrogen-containing compounds such as N,N-dimethylacetamide and cyclic nitrogen-containing compounds such as N-methylpyrrolidone.
- the [b] organic solvent preferably contains an alcohol solvent.
- the alcohol solvent monoalcohols, polyhydric alcohol partial ethers, lactic acid esters, hydrazide alcohols or hydroxyketone hydrazones are preferable.
- the organic solvent [b] contains an alcohol solvent, the conductivity and embedding property of the cobalt-containing film formed from the coating film forming composition can be further improved.
- the organic solvent contains an alcohol-based solvent, the cobalt atom in the coating film is reduced by the alcohol-based solvent in the heating step of the coating film to become zero-valent, and the conductivity of the cobalt-containing film is improved. It is thought that.
- the lower limit of the content ratio of the alcohol solvent in the [b] organic solvent is preferably 1% by mass, more preferably 10% by mass, further preferably 50% by mass, 80% by weight is particularly preferred.
- the content ratio of the alcohol solvent in the organic solvent [b] may be 100% by mass.
- the upper limit of the water content in the [B] solvent is preferably 50% by mass, more preferably 40% by mass, and further preferably 30% by mass.
- the lower limit of the water content is, for example, 0.01% by mass.
- the lower limit of the content ratio of the [B] solvent in the coating film forming composition is preferably 30% by mass, more preferably 50% by mass, further preferably 60% by mass, particularly preferably 70% by mass, and 75% by mass. % Is even more particularly preferred.
- the upper limit of the content is preferably 99% by mass, more preferably 95% by mass, further preferably 90% by mass, and particularly preferably 85% by mass.
- the lower limit of the content of the [B] solvent is preferably 50 parts by mass, more preferably 100 parts by mass, further preferably 200 parts by mass, and particularly preferably 300 parts by mass with respect to 100 parts by mass of the [A] compound.
- the upper limit of the content is preferably 10,000 parts by mass, more preferably 2,000 parts by mass, further preferably 1,000 parts by mass, and particularly preferably 500 parts by mass.
- the storage stability of the coating film forming composition can be further improved.
- composition for forming a coating film as an optional component, an organic compound other than [B] solvent (hereinafter, also referred to as “[C] other organic compound”), a metal-containing compound other than [A] compound (hereinafter, (Also referred to as "other metal-containing compound”) and the like.
- organic compound other than [B] solvent hereinafter, also referred to as “[C] other organic compound”
- metal-containing compound other than [A] compound hereinafter, (Also referred to as "other metal-containing compound”
- other metal-containing compound hereinafter, (Also referred to as "other metal-containing compound”
- [C] Other organic compounds include, for example, compounds having an alcoholic hydroxyl group, compounds having a phenolic hydroxyl group, nitrogen-containing compounds, oxalic acid and the like. [C] When the above compound is used as the other organic compound, the conductivity and embedding property of the cobalt-containing film formed from the coating film forming composition can be further improved.
- Examples of the compound having an alcoholic hydroxyl group include a compound having a plurality of alcoholic hydroxyl groups, a hydroxy acid or a salt thereof, a sugar compound and the like.
- Examples of the compound having a plurality of alcoholic hydroxyl groups include ascorbic acid or a salt thereof, erythorbic acid or a salt thereof, trimethylolpropane, diethanolamine, pentaerythritol, dipentaerythritol, adamantanediol, adamantanetriol, adamantanetetraol, 1,3 -Dimethyl adamantane-5,7-diol, polyethylene glycol, polyvinyl alcohol and the like can be mentioned.
- hydroxy acid examples include glycolic acid, lactic acid, 3-hydroxypropionic acid, glyceric acid, tartronic acid, malic acid, tartaric acid, citric acid, 10-hydroxydecanoic acid, tropic acid and benzylic acid.
- sugar compounds include erythritol, mesoerythritol, ribitol, xylitol, sorbitol, maltitol, glucose, fructose, lactose, arabinose, galactose, sucrose, maltose, trehalose, gluconic acid and glyceraldehyde.
- Examples of the compound having a phenolic hydroxyl group include gallic acid or its salt or its ester, salicylic acid or its salt or its ester, tocopherol or its derivative, 2,6-di-t-butyl-4-methylphenol, t-butyl- Examples thereof include methoxyphenol, catechol, resorcinol, hydroquinone, pyrogallol, phloroglucinol, 1,2,4-trihydroxybenzene, dihydroxynaphthalene, rosmarinic acid, tannic acid, caffeic acid, dihydrocaffeic acid and quercetin.
- nitrogen-containing compound examples include formic acid hydrazide, acetic acid hydrazide, cyanoacetic acid hydrazide, trifluoroacetic acid hydrazide, propionic acid hydrazide, cyclohexanecarboxylic acid hydrazide, benzoic acid hydrazide, p-toluic acid hydrazide, salicylic acid hydrazide, 3-hydroxy-2-hydroxide.
- Examples include hydrazones such as 9-fluorenone hydrazone, anthraquinone monohydrazone and salicylaldehyde hydrazone, and hydrazine derivatives such as methyl carbazate, ethyl carbazate, t-butyl carbazate and benzyl carbazate. ..
- metal-containing compounds As other metal-containing compounds, compounds other than cobalt, such as compounds containing nickel, iron, ruthenium, copper, silver, gold, palladium, platinum, zinc, aluminum, tin, tungsten, zirconium, titanium, tantalum, molybdenum, etc. are listed.
- the other metal-containing compound may be a metal salt or a complex having a metal and a ligand.
- the lower limit of the content ratio of the [A] compound in the entire metal containing compound contained in the coating film forming composition is 50 mass. %, more preferably 70% by mass, further preferably 90% by mass, particularly preferably 99% by mass.
- the content ratio of the [A] compound in the whole metal-containing compound contained in the coating film forming composition may be 100% by mass.
- the coating film-forming composition is prepared by mixing the [A] compound, the [B] solvent and, if necessary, optional components in a predetermined ratio, and preferably using the obtained mixture with a filter having a pore size of 0.2 ⁇ m or less. It can be prepared by filtration.
- the method for manufacturing the substrate includes a step of applying the composition directly or indirectly to the substrate (hereinafter, also referred to as “application step”).
- the composition described above as the composition for forming a coating film hereinafter, also referred to as “composition (I)”.
- a cobalt-containing film having excellent conductivity and embeddability can be formed by using the coating film forming composition described above.
- the method for manufacturing the substrate may further include a step of heating the coating film formed by the coating step (hereinafter, also referred to as “heating step”) after the coating step.
- the composition (I) is applied directly or indirectly to the substrate.
- the coating film is directly or indirectly formed on the substrate.
- the above-mentioned coating method is not particularly limited and can be carried out by an appropriate method such as spin coating, cast coating, roll coating and the like.
- the case where the composition (I) is indirectly applied to the substrate includes, for example, the case where the surface-modified film of the substrate is formed on the substrate.
- the surface modification film of the substrate is, for example, a film having a contact angle with water different from that of the coating film.
- the substrate may be, for example, a metal substrate or a silicon wafer.
- the “metal substrate” refers to a substrate containing metal atoms in at least a part of its surface layer.
- the metal atom contained in the metal substrate is not particularly limited as long as it is an atom of a metal element. Silicon and boron are not included in the metal atom.
- Examples of the metal atom include copper, iron, zinc, cobalt, aluminum, tin, tungsten, zirconium, titanium, tantalum, germanium, molybdenum, ruthenium, gold, silver, platinum, palladium, nickel and the like.
- Examples of the metal substrate include a metal substrate and a metal-coated silicon wafer.
- a silicon nitride film, an alumina film, a silicon dioxide film, a tantalum nitride film, a titanium nitride film, or the like may be formed on a part of the metal substrate.
- the substrate may be a substrate on which no pattern is formed or a substrate on which a pattern is formed.
- the line width of the space portion is 2,000 nm or less, 1,000 nm or less, 500 nm or less, and further a line and space pattern or trench pattern of 50 nm or less, or a diameter of 300 nm or less
- the hole pattern include 150 nm or less, 100 nm or less, and further 50 nm or less.
- the dimensions of the pattern formed on the substrate are, for example, height of 100 nm or more, 200 nm or more, further 300 nm or more, width of 50 nm or less, 40 nm or less, further 30 nm or less, aspect ratio (pattern height/pattern width)
- a fine pattern of 3 or more, 5 or more, and further 10 or more can be used.
- the coating film formed by applying the composition for forming a coating film on the substrate fills the concave portion of the pattern.
- the substrate on which the pattern is formed is a substrate on which the pattern of the silicon dioxide film is formed on a part of the metal substrate
- the coating film fills the concave portion of the pattern to form the conductive circuit. can do.
- This step is an optional step of heating the coating film formed by the above coating step. It is considered that this step improves the conductivity of the coating film. It is considered that by heating the coating film, the cobalt atoms in the coating film are reduced to zero valence, and the conductivity of the cobalt-containing film is improved.
- the atmosphere for heating the coating film may be a nitrogen atmosphere, a hydrogen atmosphere, an atmosphere, or the like. It is considered that when the coating film is heated in a hydrogen atmosphere, the reduction of cobalt atoms in the coating film is further promoted and the conductivity of the cobalt-containing film is further improved.
- the lower limit of the heating temperature is preferably 200°C, more preferably 300°C, and even more preferably 400°C.
- the upper limit of the temperature is preferably 700°C, more preferably 600°C, and even more preferably 550°C.
- the lower limit of the heating time is preferably 10 seconds, more preferably 60 seconds, and even more preferably 180 seconds.
- the upper limit of the above time is preferably 3,000 seconds, more preferably 1,200 seconds, and even more preferably 600 seconds.
- the coating film Before heating the coating film, it may be preheated at a temperature of 60°C or higher and 150°C or lower.
- the lower limit of the time for preheating is preferably 10 seconds, more preferably 30 seconds.
- the upper limit of the time is preferably 300 seconds, more preferably 180 seconds.
- the radiation used for this exposure is appropriately selected from visible rays, ultraviolet rays, far ultraviolet rays, electromagnetic waves such as X-rays and ⁇ rays, and particle beams such as electron beams, molecular beams and ion beams.
- the lower limit of the average thickness of the formed cobalt-containing film is preferably 1 nm, more preferably 10 nm, further preferably 30 nm.
- the upper limit of the average thickness is preferably 1,000 nm, more preferably 500 nm, even more preferably 300 nm.
- the pattern forming method includes a step of directly or indirectly coating the composition (I) on a substrate and an organic resist film directly or indirectly on the resist underlayer film formed by the coating film forming composition coating step.
- a step of applying a forming composition, a step of exposing the organic resist film formed by the organic resist film forming composition applying step to radiation, and a step of developing the exposed organic resist film Using the organic resist pattern formed by the developing step as a mask, a step of contacting chlorine gas with the resist underlayer film, and a step of removing the resist underlayer film in contact with chlorine gas with a removing liquid containing water or an organic solvent are provided. ..
- the pattern forming method includes a step of applying the composition (I) described above to a substrate (hereinafter, also referred to as “application step (I-1)”), and a coating step (I -1) applying a composition for forming an organic resist film to the resist underlayer film formed (hereinafter, also referred to as “coating step (I-2)”) and the above coating step (I-2 )
- a step of exposing the organic resist film formed by radiation to radiation hereeinafter, also referred to as “exposure step”
- a step of developing the exposed organic resist film hereinafter, also referred to as “developing step”
- a step of bringing chlorine gas into contact with the resist underlayer film hereinafter, also referred to as "chlorine gas contacting step”
- chlorine gas contacting step a step of bringing chlorine gas into contact with the resist underlayer film
- chlorine gas contacting step a removing chlorine gas with a removing solution containing water or an organic solvent
- the pattern forming method includes a step of directly or indirectly forming an organic underlayer film on the substrate (hereinafter, also referred to as “organic underlayer film forming step (I)”) before the coating step (I-1). Further provisions can be made.
- the pattern forming method optionally includes a step of forming a silicon-containing film on the resist underlayer film formed in the coating step (I-1) before the coating step (I-2). May be.
- the composition (I) since the composition (I) is used, a good pattern can be formed.
- Organic Underlayer Film Forming Step (I) In this step, an organic underlayer film is formed on the substrate.
- the organic underlayer film include the same as the organic underlayer film formed by the inversion pattern forming method described later.
- the composition (I) is applied directly or indirectly to the substrate.
- a resist underlayer film is formed.
- the case where the composition (I) is indirectly applied to the substrate include a case where the composition (I) is applied to the organic underlayer film formed in the above organic underlayer film forming step (I). In this case, the resist underlayer film is formed on the organic underlayer film.
- This step is the same as the coating step in the above-described substrate manufacturing method.
- Silicon-containing film forming step In this step, a silicon-containing film is formed on the resist underlayer film formed in the coating step (I-1).
- the silicon-containing film is usually formed by applying a composition for forming a silicon-containing film to the resist underlayer film, and then curing the coating film by exposing and/or heating.
- a composition for forming a silicon-containing film for example, "NFC SOG01”, “NFC SOG04”, “NFC SOG080”, etc. of JSR Corporation can be used.
- Examples of the radiation used for the above-mentioned exposure include electromagnetic waves such as visible light rays, ultraviolet rays, far ultraviolet rays, X-rays and ⁇ rays, and particle beams such as electron beams, molecular beams and ion beams.
- the lower limit of the temperature for heating the coating film is preferably 90°C, more preferably 150°C, and even more preferably 180°C.
- As the upper limit of the temperature 550° C. is preferable, 450° C. is more preferable, and 300° C. is further preferable.
- this step specifically, by coating the composition for forming an organic resist film so that the resulting organic resist film has a predetermined thickness, and then heating to evaporate the solvent in the coating film. Forming an organic resist film.
- Examples of the organic resist film-forming composition include a positive or negative chemically amplified resist composition containing a radiation-sensitive acid generator, and a positive resist composition containing an alkali-soluble resin and a quinonediazide-based photosensitizer. And a negative resist composition containing an alkali-soluble resin and a crosslinking agent.
- the composition for forming an organic resist film is generally provided for forming an organic resist film by filtering with a filter having a pore size of 0.2 ⁇ m or less. In this step, a commercially available organic resist composition can be used as it is.
- the method of applying the composition for forming an organic resist film is not particularly limited, and examples thereof include a spin coating method.
- the heating temperature is appropriately adjusted depending on the type of the organic resist film forming composition used and the like, but the lower limit of the temperature is preferably 30°C, more preferably 50°C.
- the upper limit of the temperature is preferably 200°C, more preferably 150°C.
- the lower limit of the heating time is preferably 10 seconds, more preferably 30 seconds.
- the upper limit of the time is preferably 600 seconds, more preferably 300 seconds.
- the radiation used for the exposure depending on the type of radiation-sensitive acid generator, quinonediazide-based photosensitizer and cross-linking agent used in the organic resist film forming composition, visible light, ultraviolet light, far ultraviolet light, X-ray, It is appropriately selected from electromagnetic waves such as ⁇ -rays, electron beams, molecular beams, and particle beams such as ion beams. Of these, far ultraviolet rays are preferable, and KrF excimer laser light (248 nm), ArF excimer laser light (193 nm), F 2 excimer laser light (wavelength 157 nm), Kr 2 excimer laser light (wavelength 147 nm), ArKr excimer laser light.
- extreme ultraviolet light Wavelength: 13.5 nm etc., EUV
- KrF excimer laser light, ArF excimer laser light, EUV or extreme ultraviolet light is more preferable, and KrF excimer laser light, ArF excimer laser light, EUV or extreme ultraviolet light is further preferable.
- heating can be performed to improve resolution, pattern profile, developability, etc.
- the heating temperature is appropriately adjusted depending on the type of the organic resist film forming composition used and the like, but the lower limit of the temperature is preferably 50°C, more preferably 70°C.
- the upper limit of the temperature is preferably 200°C, more preferably 150°C.
- the lower limit of the heating time is preferably 10 seconds, more preferably 30 seconds.
- the upper limit of the time is preferably 600 seconds, more preferably 300 seconds.
- the exposed organic resist film is developed.
- This development may be alkali development or organic solvent development.
- As the developing solution in the case of alkali development, for example, sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, ammonia, ethylamine, n-propylamine, diethylamine, di-n-propylamine, triethylamine, methyl Diethylamine, dimethylethanolamine, triethanolamine, tetramethylammonium hydroxide (TMAH), tetraethylammonium hydroxide, pyrrole, piperidine, choline, 1,8-diazabicyclo[5.4.0]-7-undecene, 1,5 Examples thereof include basic aqueous solutions of diazabicyclo[4.3.0]-5-nonene and the like.
- a water-soluble organic solvent such as alcohols such as methanol and ethanol, a surfactant and the like
- examples of the developing solution include various organic solvents exemplified as the solvent [B] of the above composition (I).
- a predetermined resist pattern is formed by washing and drying.
- organic solvent examples include those listed as the organic solvent [b].
- the removing liquid (I) contains an acid, for example, a liquid containing an acid and water, a liquid obtained by mixing an acid, hydrogen peroxide and water, and the like can be mentioned.
- the acid include sulfuric acid, hydrofluoric acid, hydrochloric acid, phosphoric acid and the like.
- the acid-containing removal liquid (I) is, for example, a liquid obtained by mixing hydrofluoric acid and water, a liquid obtained by mixing sulfuric acid, hydrogen peroxide and water, hydrochloric acid, or peroxide. Examples include liquids obtained by mixing hydrogen and water.
- the removal liquid (I) contains a base
- examples thereof include a liquid containing a base and water, a liquid obtained by mixing a base, hydrogen peroxide and water, and the like, which is obtained by mixing a base, hydrogen peroxide and water. Liquids are preferred.
- Examples of the base include sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, ammonia, ethylamine, n-propylamine, diethylamine, di-n-propylamine, triethylamine, methyldiethylamine, dimethylethanolamine, Triethanolamine, tetramethylammonium hydroxide (TMAH), tetraethylammonium hydroxide, pyrrole, piperidine, choline, 1,8-diazabicyclo[5.4.0]-7-undecene, 1,5-diazabicyclo[4.3] .0]-5-nonene and the like. Of these, ammonia is preferred.
- the lower limit of the temperature in the removing step is preferably 20°C, more preferably 40°C, and even more preferably 50°C.
- the upper limit of the temperature is preferably 300°C, more preferably 100°C.
- the lower limit of the time in the removing step is preferably 5 seconds, more preferably 30 seconds.
- the upper limit of the time is preferably 10 minutes, more preferably 180 seconds.
- the inversion pattern forming method includes a step of directly or indirectly forming an organic underlayer film on a substrate (hereinafter, also referred to as “organic underlayer film forming step (II)”) and a resist pattern directly or indirectly on the organic underlayer film.
- a step of forming hereinafter, also referred to as “resist pattern forming step (II)”
- resist pattern forming step (II) a step of forming a reverse pattern forming film on the resist pattern
- reverse pattern forming film forming step a step of forming a reverse pattern by removing the resist pattern
- the composition hereinafter, also referred to as “composition (II)”
- composition (II)) described above as the coating film forming composition is used in the inversion pattern forming film forming step.
- the composition (II) since the composition (II) is used, a good inversion pattern can be formed.
- the reversal pattern forming method includes a step of forming a resist intermediate film on the organic underlayer film formed by the organic underlayer film forming step (II) before the resist pattern forming step (hereinafter, referred to as "resist intermediate step", if necessary). (Also referred to as a film forming step)). May be further provided.
- an organic underlayer film is formed on the substrate.
- the substrate include the same substrates as those used in the coating step in the above-described method for manufacturing the substrate.
- the organic underlayer film can be formed of an organic compound.
- organic compound as a commercially available product, for example, "NFC HM8006" of JSR Corporation can be mentioned.
- the organic underlayer film can be formed by applying a composition for forming an organic underlayer film by a spin coating method or the like to form a coating film, and then heating.
- the lower limit of the average thickness of the organic underlayer film formed is preferably 10 nm, more preferably 50 nm, further preferably 100 nm.
- the upper limit of the average thickness is preferably 1000 nm, more preferably 500 nm.
- a resist intermediate film is formed on the organic underlayer film formed in the above organic underlayer film forming step (II).
- the resist intermediate film commercially available products such as “NFC SOG01”, “NFC SOG04”, and “NFC SOG080” (above, JSR Corporation) can be mentioned. Further, polysiloxane, titanium oxide, aluminum oxide, tungsten oxide, or the like formed by a CVD method can be used.
- the method for forming the resist intermediate film is not particularly limited, but for example, a coating method, a CVD method or the like can be used. Among these, the coating method is preferable. When the coating method is used, the resist intermediate film can be continuously formed after forming the organic underlayer film.
- resist pattern forming step (II) In this step, a resist pattern is formed directly or indirectly on the organic underlayer film.
- Examples of the case of indirectly forming a resist pattern on the organic underlayer film include a case of forming a resist pattern on the resist intermediate film formed by the resist intermediate film forming step.
- Examples of methods for forming the resist pattern include known methods such as a method using a resist composition and a method using a nanoimprint lithography method.
- a reverse pattern forming film is formed on the resist pattern.
- the reverse pattern forming film is formed by applying the composition (II) onto the substrate on which the resist pattern is formed.
- the composition (II) is embedded in the gap between the resist patterns.
- examples of the method for applying the composition (II) onto the substrate on which the resist pattern is formed include known methods such as spin coating, cast coating, and roll coating.
- the drying means is not particularly limited, for example, the organic solvent [b] in the composition (II) can be volatilized by firing.
- the firing conditions are appropriately adjusted depending on the composition of the resin composition, but the firing temperature is usually 80 to 250°C, preferably 80 to 200°C.
- the firing temperature is 80 to 180° C.
- the flattening step described later, particularly the flattening process by the wet etch back method can be smoothly performed.
- the heating time is usually 10 to 300 seconds, preferably 30 to 180 seconds.
- the thickness of the reverse pattern forming film obtained after drying is not particularly limited, but is usually 10 to 1000 nm, preferably 20 to 500 nm.
- a flattening process is performed to expose the upper surface of the resist pattern.
- the resist pattern is removed by dry etching or dissolution removal to obtain a predetermined inversion pattern.
- an etching method such as dry etch back or wet etch back, or a CMP method can be used.
- the dry etch back method and the wet etch back method using a fluorine-based gas or the like are preferable at low cost.
- the processing conditions in the flattening process are not particularly limited and can be adjusted as appropriate.
- dry etching is preferable for removing the resist pattern, and specifically, oxygen-based gas etching, ozone etching, etc. are preferably used.
- oxygen-based gas etching, ozone etching, etc. are preferably used.
- Known devices such as an oxygen plasma ashing device and an ozone ashing device can be used for the dry etching.
- the etching processing conditions are not particularly limited and can be adjusted appropriately.
- the inversion pattern formed by the above-described inversion pattern forming method can be used as, for example, a mask when patterning the organic underlayer film.
- the above-mentioned inversion pattern forming method can be suitably adopted as a pre-process of the organic underlayer film pattern forming method described later.
- the organic underlayer film pattern forming method includes a step of etching the organic underlayer film using the inversion pattern formed by the above inversion pattern forming method as a mask (hereinafter, also referred to as “organic underlayer film pattern forming step”), After the chlorine gas is brought into contact with the inversion pattern, a step of removing the inversion pattern with a removing liquid containing water or an organic solvent (hereinafter, also referred to as “inversion pattern removing step”) is provided.
- Organic underlayer film pattern forming step In this step, the organic underlayer film is etched by using the inversion pattern formed by the above inversion pattern forming method as a mask.
- this etching method include dry etching and wet etching.
- the dry etching can be performed using a known dry etching apparatus.
- the source gas during dry etching depends on the elemental composition of the film to be etched, but is, for example, a fluorine-based gas such as CHF 3 , CF 4 , C 2 F 6 , C 3 F 8 or SF 6 , Cl 2 or the like.
- Chlorine-based gas such as BCl 3
- oxygen-based gas such as O 2 and O 3 , H 2 , NH 3 , CO, CO 2 , CH 4 , C 2 H 2 , C 2 H 4 , C 2 H 6 , C A reducing gas such as 3 H 4 , C 3 H 6 , C 3 H 8 , HF, HI, HBr, HCl, NO, NH 3 , BCl 3 or an inert gas such as He, N 2 or Ar is used. It is also possible to use a mixture of these gases.
- a fluorine-based gas is used for dry etching of the resist intermediate film when forming the resist intermediate film
- an oxygen-based gas is preferably used for dry etching of the organic lower layer film.
- the removing solution used in this step is the same as the removing solution (I) in the removing step of the pattern forming method described above.
- the cobalt metal layer (wiring layer) is formed.
- a barrier metal film may be formed before applying the coating film forming composition.
- CMP chemical polishing
- Average film thickness The average thickness of the film was measured using an X-ray diffractometer (“SmartLab” manufactured by Rigaku Corporation).
- B-1 Propylene glycol monoethyl ether
- B-2 Ethyl lactate
- B-3 n-Butyl alcohol
- B-4 Propylene glycol monomethyl ether acetate
- B-5 Ethylene glycol
- B-6 1,2-butanediol
- B- 7 diethylene glycol
- B-8 triethanolamine
- B-9 water
- B-10 2-hydrazinoethanol (compound represented by the following formula (B-10))
- B-11 1-hydroxy-2-propanone hydrazone (compound represented by the following formula (B-11))
- C-1 Citric acid (compound represented by the following formula (C-1))
- C-2 Ascorbic acid (compound represented by the following formula (C-2))
- C-3 gallic acid (compound represented by the following formula (C-3))
- C-4 Acetic acid hydrazide (compound represented by the following formula (C-4))
- C-5 Methylcarbazate (a compound represented by the following formula (C-5))
- C-6 Cyanoacetic acid hydrazide (compound represented by the following formula (C-6))
- C-7 Salicylic acid hydrazide (compound represented by the following formula (C-7))
- Example 1 18 parts by mass of (A-1) as a compound [A] and 2 parts by mass of (A-2) are mixed with 80 parts by mass of (B-1) as a solvent [B], and the resulting solution has a pore size of A 0.2 ⁇ m nylon syringe filter was used for filtration to prepare a coating film forming composition (J-1).
- Examples 2 to 24 and Comparative Examples 1 to 2 The coating film forming compositions (J-2) to (J-24) and (j-) were operated in the same manner as in Example 1 except that the components and contents shown in Table 1 below were used. 1) to (j-2) were prepared. "-" in Table 1 indicates that the corresponding component was not used.
- the storage stability of the coating film-forming composition was evaluated by the difference in coating property over time.
- the obtained coating film was heated at 500° C. for 300 seconds in a nitrogen atmosphere using an RTA furnace (“QHC-P610CP” manufactured by ULVAC, Inc.). A cobalt-containing film was formed.
- composition for coating film formation immediately after the above preparation was applied onto a silicon substrate by a spin coating method using a spin coater (“MS-B200” manufactured by Mikasa Co., Ltd.).
- a spin coater (“MS-B200” manufactured by Mikasa Co., Ltd.).
- RTA furnace (“QHC-P610CP” manufactured by ULVAC, Inc.) in a nitrogen atmosphere, the sample was heated at 500° C. for 300 seconds and then cooled at 23° C. for 60 seconds to give an average thickness of 200 nm.
- a cobalt-containing film was formed to obtain a silicon substrate with a cobalt-containing film.
- the resistivity of the cobalt-containing film in the silicon substrate with the cobalt-containing film was measured using a resistivity measuring device (“ ⁇ -5” manufactured by Enpies Co., Ltd.) by the direct current 4-probe method.
- the electrical conductivity is “S” (extremely good) when the specific resistance is 25.0 ⁇ cm or less and “A” (good) when the specific resistance is more than 25.0 ⁇ cm and 50.0 ⁇ cm or less, When it was larger than 50.0 ⁇ cm, it was evaluated as “B” (poor).
- a spin coater (“MS-B200” manufactured by Mikasa Co., Ltd.) was applied to the prepared coating film-forming composition on a silicon substrate on which a line-and-space pattern having a depth of 400 nm and a width of 45 nm was formed. It was used and was coated by the spin coating method.
- an RTA furnace (“QHC-P610CP” manufactured by ULVAC, Inc.) in a nitrogen atmosphere, after heating at 500°C for 300 seconds and then cooling at 23°C for 60 seconds, the line pattern portion A cobalt-containing film having an average thickness of 50 nm was formed to obtain a silicon substrate with a cobalt-containing film.
- the cross-sectional shape of the silicon substrate with the cobalt-containing film was observed with a scanning electron microscope (“SU8220” manufactured by Hitachi High-Technologies Corporation) to evaluate embeddability.
- the embeddability was evaluated as "A” (good) when the cobalt-containing film was buried to the bottom of the space pattern and "B” (bad) when the cobalt-containing film was not buried to the bottom of the pattern. ..
- the coating film forming compositions of the examples are excellent in storage stability and also in conductivity and embedding property of the cobalt-containing film to be formed.
- the coating film forming composition of the present invention has excellent storage stability. According to the method for producing a substrate of the present invention, by using the coating film forming composition, a cobalt-containing film having excellent conductivity and embedding property can be formed. Therefore, these can be suitably used in forming a cobalt-containing film in the fields of semiconductors, battery materials and the like.
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Abstract
Description
当該塗工膜形成用組成物は、[A]化合物と、[B]溶媒とを含有する。当該塗工膜形成用組成物は、本発明の効果を損なわない範囲において、任意成分を含有していてもよい。
[A]化合物は、コバルト-炭素結合を有さないコバルト含有化合物である。当該塗工膜形成用組成物は、2種類以上の[A]化合物を含有していてもよい。「コバルト含有化合物」とは、コバルト原子を含む化合物をいう。「コバルト-炭素結合」とは、例えばコバルトカルボニル錯体、コバルトシアノ錯体、コバルトセン錯体、コバルト-アルキル錯体、コバルト-アシル錯体等が有するコバルト原子-炭素原子間の共有結合又は配位結合をいう。当該塗工膜形成用組成物は、[A]化合物としてコバルト-炭素結合を有さない化合物を用いることにより、保存安定性に優れるものとなる。
[B]溶媒は、[A]化合物及び必要に応じて含有される任意成分を溶解又は分散できるものであれば特に限定されず用いることができる。[B]溶媒は、1種単独で又は2種以上を組み合わせて用いることができる。
当該塗工膜形成用組成物は、任意成分として、[B]溶媒以外の有機化合物(以下、「[C]他の有機化合物」ともいう)、[A]化合物以外の金属含有化合物(以下、「他の金属含有化合物」ともいう)等を含有していてもよい。これらの任意成分は、1種単独で又は2種以上を組み合わせて用いることができる。
[C]他の有機化合物としては、例えばアルコール性水酸基を有する化合物、フェノール性水酸基を有する化合物、窒素含有化合物、シュウ酸等が挙げられる。[C]他の有機化合物として、上記化合物を用いると、当該塗工膜形成用組成物から形成されるコバルト含有膜の導電性及び埋め込み性をより向上させることができる。
他の金属含有化合物としては、コバルト以外の金属、例えばニッケル、鉄、ルテニウム、銅、銀、金、パラジウム、白金、亜鉛、アルミニウム、スズ、タングステン、ジルコニウム、チタン、タンタル、モリブデン等を含む化合物などが挙げられる。他の金属含有化合物は、金属塩であっても、金属と配位子とを有する錯体であってもよい。
当該塗工膜形成用組成物は、[A]化合物、[B]溶媒及び必要に応じて任意成分を所定の割合で混合し、好ましくは得られた混合物を孔径0.2μm以下のフィルター等でろ過することにより調製することができる。
当該基板の製造方法は、基板に直接又は間接に組成物を塗工する工程(以下、「塗工工程」ともいう)を備える。当該基板の製造方法では、上記組成物として、上述の当該塗工膜形成用組成物として示した組成物(以下、「組成物(I)」ともいう)を用いる。
本工程では、基板に直接又は間接に組成物(I)を塗工する。本工程により、基板に直接又は間接に塗工膜が形成される。上記塗工方法は特に限定されず、例えば回転塗工、流延塗工、ロール塗工等の適宜の方法で実施することができる。基板に間接に組成物(I)を塗工する場合としては、例えば基板上に基板の表面改質膜が形成された場合などが挙げられる。上記基板の表面改質膜は、例えば水との接触角が上記塗工膜とは異なる膜である。
本工程は、上記塗工工程により形成された塗工膜を加熱する任意の工程である。本工程により塗工膜の導電性が向上すると考えられる。塗工膜を加熱することで、塗工膜中のコバルト原子は還元されて、0価となり、コバルト含有膜の導電性が向上すると考えられる。
当該パターン形成方法は、基板に直接又は間接に組成物(I)を塗工する工程と、上記塗工膜形成用組成物塗工工程により形成されたレジスト下層膜に直接又は間接に有機レジスト膜形成用組成物を塗工する工程と、上記有機レジスト膜形成用組成物塗工工程により形成された有機レジスト膜を放射線により露光する工程と、上記露光された有機レジスト膜を現像する工程と、上記現像工程により形成された有機レジストパターンをマスクとして、レジスト下層膜に塩素ガスを接触させる工程と、水又は有機溶媒を含む除去液で塩素ガスに接触したレジスト下層膜を除去する工程とを備える。
本工程では、基板に有機下層膜を形成する。有機下層膜としては、例えば後述する反転パターン形成方法で形成される有機下層膜と同様のものが挙げられる。
本工程では、基板に直接又は間接に組成物(I)を塗工する。本工程により、レジスト下層膜が形成される。基板に間接に組成物(I)を塗工する場合としては、例えば上記有機下層膜形成工程(I)により形成された有機下層膜に組成物(I)を塗工する場合などが挙げられる。この場合、有機下層膜上にレジスト下層膜が形成される。本工程は、上述した当該基板の製造方法における塗工工程と同様である。
本工程では、上記塗工工程(I-1)により形成されたレジスト下層膜にケイ素含有膜を形成する。
本工程では、上記塗工工程(I-1)により形成されたレジスト下層膜に、有機レジスト膜形成用組成物を塗工する。上記ケイ素含有膜形成工程を行った場合には、上記有機レジスト膜形成用組成物を上記ケイ素含有膜に塗工する。本工程により、有機レジスト膜が形成される。
本工程では、上記塗工工程(I-2)により形成された有機レジスト膜を放射線により露光する。
本工程では、上記露光された有機レジスト膜を現像する。この現像は、アルカリ現像であっても有機溶媒現像であってもよい。現像液としては、アルカリ現像の場合、例えば水酸化ナトリウム、水酸化カリウム、炭酸ナトリウム、珪酸ナトリウム、メタ珪酸ナトリウム、アンモニア、エチルアミン、n-プロピルアミン、ジエチルアミン、ジ-n-プロピルアミン、トリエチルアミン、メチルジエチルアミン、ジメチルエタノールアミン、トリエタノールアミン、テトラメチルアンモニウムヒドロキシド(TMAH)、テトラエチルアンモニウムヒドロキシド、ピロール、ピペリジン、コリン、1,8-ジアザビシクロ[5.4.0]-7-ウンデセン、1,5-ジアザビシクロ[4.3.0]-5-ノネン等の塩基性水溶液が挙げられる。これらの塩基性水溶液には、例えばメタノール、エタノール等のアルコール類などの水溶性有機溶媒、界面活性剤等を適量添加することもできる。また、有機溶媒現像の場合、現像液としては、例えば上述の組成物(I)の[B]溶媒として例示した種々の有機溶媒等が挙げられる。
本工程では、上記現像工程(I)により形成されたレジストパターンをマスクとして、レジスト下層膜に塩素ガスを接触させる。これにより、塩素ガスに接触したレジスト下層膜は、塩化コバルト(II)を主成分とする膜となり、水又は有機溶媒を含む除去液に溶解性を有する。
本工程では、水又は有機溶媒を含む除去液で塩素ガスに接触したレジスト下層膜を除去する。これにより、レジスト下層膜のパターンが形成される。
当該反転パターン形成方法は、基板に直接又は間接に有機下層膜を形成する工程(以下、「有機下層膜形成工程(II)」ともいう)と、上記有機下層膜に直接又は間接にレジストパターンを形成する工程(以下、「レジストパターン形成工程(II)」ともいう)と、上記レジストパターンに反転パターン形成用膜を形成する工程(以下、「反転パターン形成用膜形成工程」ともいう)と、上記レジストパターンの除去により反転パターンを形成する工程(以下、「反転パターン形成工程」ともいう)とを備える。当該基板の製造方法では、上記反転パターン形成用膜形成工程において、上述の当該塗工膜形成用組成物として示した組成物(以下、「組成物(II)」ともいう)を用いる。
本工程では、基板に有機下層膜を形成する。基板としては、上述の当該基板の製造方法における塗工工程で用いる基板と同様のものが挙げられる。
本工程では、上記有機下層膜形成工程(II)により形成された有機下層膜にレジスト中間膜を形成する。上記レジスト中間膜としては、市販品として、例えば「NFC SOG01」、「NFC SOG04」、「NFC SOG080」(以上、JSR(株))等が挙げられる。また、CVD法により形成されるポリシロキサン、酸化チタン、酸化アルミニウム、酸化タングステン等を用いることができる。レジスト中間膜の形成方法は特に限定されないが、例えば塗布法やCVD法等を用いることができる。これらの中でも、塗布法が好ましい。塗布法を用いた場合、有機下層膜を形成した後、レジスト中間膜を連続して形成することができる。
本工程では、上記有機下層膜に直接又は間接にレジストパターンを形成する。上記有機下層膜に間接にレジストパターンを形成する場合としては、例えば上記レジスト中間膜形成工程により形成されたレジスト中間膜にレジストパターンを形成する場合などが挙げられる。レジストパターンを形成する方法としては、例えばレジスト組成物を用いる方法、ナノインプリントリソグラフィー法を用いる方法等の公知の方法が挙げられる。
本工程では、上記レジストパターンに反転パターン形成用膜を形成する。具体的には、本工程では、上記レジストパターンが形成された基板上に上記組成物(II)を塗工することにより、反転パターン形成用膜を形成する。この場合、上記レジストパターンの間隙には組成物(II)が埋め込まれる。具体的には、上記レジストパターンが形成された基板上に組成物(II)を塗工する方法としては、例えば回転塗布、流延塗布、ロール塗布等の公知の方法が挙げられるまた、本工程においては、組成物(II)を上記レジストパターンの間隙に埋め込んだ後に、乾燥工程を設けることが好ましい。上記乾燥手段は特に限定されないが、例えば、焼成することにより、組成物(II)中の[b]有機溶媒を揮発させることができる。この焼成条件は、樹脂組成物の配合組成によって適宜調整されるが、焼成温度は通常80~250℃、好ましくは80~200℃である。この焼成温度が、80~180℃である場合には、後述の平坦化工程、特にウェットエッチバック法による平坦化加工を円滑に行うことができる。なお、この加熱時間は通常10~300秒間、好ましくは30~180秒間である。また、乾燥後に得られる反転パターン形成用膜の厚みは特に限定されないが、通常10~1000nmであり、好ましくは20~500nmである。
本工程では、上記レジストパターンが除去され、反転パターンが形成される。
上述の当該反転パターン形成方法により形成された反転パターンは、例えば有機下層膜をパターニングする際のマスク等として用いることができる。換言すると、上述の当該反転パターン形成方法は、後述する有機下層膜パターン形成方法の前工程として好適に採用することができる。
本工程では、上述の当該反転パターン形成方法により形成された反転パターンをマスクとして、有機下層膜のエッチングを行う。このエッチングの方法としては、ドライエッチング、ウエットエッチング等が挙げられる。上記ドライエッチングは、公知のドライエッチング装置を用いて行うことができる。また、ドライエッチング時のソースガスとしては、被エッチ膜の元素組成にもよるが、例えば、CHF3、CF4、C2F6、C3F8、SF6等のフッ素系ガス、Cl2、BCl3等の塩素系ガス、O2、O3等の酸素系ガス、H2、NH3、CO、CO2、CH4、C2H2、C2H4、C2H6、C3H4、C3H6、C3H8、HF、HI、HBr、HCl、NO、NH3、BCl3等の還元性ガス、He、N2、Ar等の不活性ガス等が用いられ、これらのガスは混合して用いることもできる。レジスト中間膜を形成する場合におけるレジスト中間膜のドライエッチングには、通常、フッ素系ガスが用いられ、有機下層膜のドライエッチングには酸素系ガスが好適に用いられる。
本工程では、上記反転パターンに塩素ガスを接触させた後、水又は有機溶媒を含有する除去液で除去する。本工程により、塩素ガスに接触した反転パターンは、塩化コバルト(II)を主成分とする膜となり、水又は有機溶媒を含む除去液に溶解性を有するため、除去される。
パターンが形成された低誘電絶縁膜に、塗工膜形成用組成物を塗工し、上記パターン(配線溝)を埋め込み、上記塗工膜を加熱することにより、コバルト金属層(配線層)を形成することができる。上記塗工膜形成用組成物を塗工する前に、バリアメタル膜を形成してもよい。コバルト金属層を形成した後、コバルト金属層の一部を化学的研磨(CMP)により除去することで、上記低誘電絶縁膜の表面を露出し、平坦化することができる。塗工条件、加熱条件は、上述の当該基板の製造方法における上記塗工工程、上記加熱工程と同様とすることができる。
膜の平均厚みは、X線回折装置((株)リガクの「SmartLab」)を用いて測定した。
塗工膜形成用組成物の調製に用いた[A]化合物、[B]溶媒及び[C]他の有機化合物について以下に示す。
化合物(A-1)~(A-6)及び(a-1)~(a-2):各化合物の構造を下記式(A-1)~(A-6)及び(a-1)~(a-2)に示す。
B-1:プロピレングリコールモノエチルエーテル
B-2:乳酸エチル
B-3:n-ブチルアルコール
B-4:プロピレングリコールモノメチルエーテルアセテート
B-5:エチレングリコール
B-6:1,2-ブタンジオール
B-7:ジエチレングリコール
B-8:トリエタノールアミン
B-9:水
B-10:2-ヒドラジノエタノール(下記式(B-10)で表される化合物)
B-11:1-ヒドロキシ-2-プロパノンヒドラゾン(下記式(B-11)で表される化合物)
C-1:クエン酸(下記式(C-1)で表される化合物)
C-2:アスコルビン酸(下記式(C-2)で表される化合物)
C-3:没食子酸(下記式(C-3)で表される化合物)
C-4:酢酸ヒドラジド(下記式(C-4)で表される化合物)
C-5:メチルカルバゼート(下記式(C-5)で表される化合物)
C-6:シアノ酢酸ヒドラジド(下記式(C-6)で表される化合物)
C-7:サリチル酸ヒドラジド(下記式(C-7)で表される化合物)
[A]化合物としての(A-1)18質量部及び(A-2)2質量部と、[B]溶媒としての(B-1)80質量部とを混合し、得られた溶液を孔径0.2μmのナイロンシリンジフィルターでろ過して、塗工膜形成用組成物(J-1)を調製した。
下記表1に示す種類及び含有量の各成分を用いた以外は、実施例1と同様に操作して、塗工膜形成用組成物(J-2)~(J-24)及び(j-1)~(j-2)を調製した。表1中の「-」は、該当する成分を使用しなかったことを示す。
上記調製した塗工膜形成用組成物(J-1)~(J-24)及び(j-1)~(j-2)について、保存安定性、形成されたコバルト含有膜の導電性及び埋め込み性を下記方法により評価した。評価結果を下記表2に示す。
塗工膜形成用組成物の保存安定性を、時間経過による塗工性の差異により評価した。上記調製した直後の塗工膜形成用組成物(T=0)をコバルト基板上に、スピンコーター(ミカサ(株)の「MS-B200」)を用い、1,500rpm及び30秒間の条件で、回転塗工法により塗工した後、得られた塗工膜を、RTA炉((株)アルバックの「QHC-P610CP」)を用いて、窒素雰囲気中にて、500℃で300秒間加熱することによりコバルト含有膜を形成した。塗工性について、形成されたコバルト含有膜を光学顕微鏡で観察し、塗工ムラが見られない場合は「A」(良好)と、塗工ムラが見られる場合は「B」(不良)と評価した。また、上記塗工性を評価した塗工膜形成用組成物を25℃で7日間保存したもの(T=7)について、上記同様に塗工性評価を行い、上記同様に評価した。保存安定性は、T=0における塗工性とT=7における塗工性とが共に「A」(良好)であると評価された場合には保存安定性が良好であり、そうでない場合には保存安定性が不良であると評価できる。
上記調製した直後の塗工膜形成用組成物をシリコン基板上に、スピンコーター(ミカサ(株)の「MS-B200」)を用い、回転塗工法により塗工した。次に、RTA炉((株)アルバックの「QHC-P610CP」)を用いて、窒素雰囲気中にて、500℃で300秒間加熱した後、23℃で60秒間冷却することにより、平均厚みが200nmのコバルト含有膜を形成し、コバルト含有膜付きシリコン基板を得た。直流4探針法による抵抗率測定器(エヌピイエス(株)の「Σ-5」)を用い、上記コバルト含有膜付きシリコン基板におけるコバルト含有膜の比抵抗率を測定した。導電性は、比抵抗率が25.0μΩ・cm以下の場合は「S」(極めて良好)と、25.0μΩ・cmより大きく50.0μΩ・cm以下の場合は「A」(良好)と、50.0μΩ・cmより大きい場合は「B」(不良)と評価した。
上記調製した塗工膜形成用組成物を、深さ400nm、幅45nmのライン・アンド・スペース・パターンが形成されたシリコン基板上に、スピンコーター(ミカサ(株)の「MS-B200」)を用い、回転塗工法により塗工した。次に、RTA炉((株)アルバックの「QHC-P610CP」)を用いて、窒素雰囲気中にて、500℃で300秒間加熱した後、23℃で60秒間冷却することにより、ラインパターンの部分における平均厚みが50nmのコバルト含有膜を形成し、コバルト含有膜付きシリコン基板を得た。上記コバルト含有膜付きシリコン基板の断面形状を走査型電子顕微鏡((株)日立ハイテクノロジーズの「SU8220」)にて観察し、埋め込み性を評価した。埋め込み性は、コバルト含有膜がスペースパターンの底部まで埋め込まれている場合は「A」(良好)と、コバルト含有膜がパターンの底部まで埋め込まれていない場合は「B」(不良)と評価した。
Claims (10)
- コバルト-炭素結合を有さないコバルト含有化合物と、
溶媒と
を含有する塗工膜形成用組成物。 - 上記溶媒が有機溶媒を含み、
上記有機溶媒がアルコール系溶媒を含む請求項1に記載の塗工膜形成用組成物。 - 上記アルコール系溶媒がモノアルコール類、多価アルコール部分エーテル類、乳酸エステル類、ヒドラジノアルコール類、ヒドロキシケトンヒドラゾン類又はこれらの組み合わせである請求項2に記載の塗工膜形成用組成物。
- 上記有機溶媒における上記アルコール系溶媒の含有割合が50質量%以上である請求項2又は請求項3に記載の塗工膜形成用組成物。
- 上記コバルト含有化合物が、硝酸、硫酸若しくはカルボン酸のコバルト塩、コバルトと配位子とを有する錯体又はこれらの組み合わせである請求項1から請求項4のいずれか1項に記載の塗工膜形成用組成物。
- 上記溶媒以外の全成分における上記コバルト含有化合物の含有割合が50質量%以上である請求項1から請求項5のいずれか1項に記載の塗工膜形成用組成物。
- パターン形成用である請求項1から請求項6のいずれか1項に記載の塗工膜形成用組成物。
- 反転パターン形成用である請求項1から請求項6のいずれか1項に記載の塗工膜形成用組成物。
- 基板に直接又は間接に組成物を塗工する工程
を備え、
上記組成物が、コバルト-炭素結合を有さないコバルト含有化合物と、溶媒とを含有する、基板の製造方法。 - 上記塗工工程により形成された塗工膜を加熱する工程
をさらに備える請求項9に記載の基板の製造方法。
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| KR1020217019485A KR102786179B1 (ko) | 2018-12-26 | 2019-12-24 | 도공막 형성용 조성물 및 기판의 제조 방법 |
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