WO2014057980A1 - ケイ素質緻密膜の形成方法 - Google Patents
ケイ素質緻密膜の形成方法 Download PDFInfo
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- WO2014057980A1 WO2014057980A1 PCT/JP2013/077487 JP2013077487W WO2014057980A1 WO 2014057980 A1 WO2014057980 A1 WO 2014057980A1 JP 2013077487 W JP2013077487 W JP 2013077487W WO 2014057980 A1 WO2014057980 A1 WO 2014057980A1
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- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/048—Forming gas barrier coatings
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- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
- B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
- B05D3/065—After-treatment
- B05D3/067—Curing or cross-linking the coating
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- C01B21/06—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron
- C01B21/068—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron with silicon
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- 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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/16—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers in which all the silicon atoms are connected by linkages other than oxygen atoms
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- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
- C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
- C23C18/1204—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material inorganic material, e.g. non-oxide and non-metallic such as sulfides, nitrides based compounds
- C23C18/122—Inorganic polymers, e.g. silanes, polysilazanes, polysiloxanes
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- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
- C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
- C23C18/1229—Composition of the substrate
- C23C18/1233—Organic substrates
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- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
- C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
- C23C18/1229—Composition of the substrate
- C23C18/1241—Metallic substrates
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- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
- C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
- C23C18/1229—Composition of the substrate
- C23C18/1245—Inorganic substrates other than metallic
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- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/14—Decomposition by irradiation, e.g. photolysis, particle radiation or by mixed irradiation sources
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- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2483/16—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers in which all the silicon atoms are connected by linkages other than oxygen atoms
Definitions
- the present invention relates to a method for manufacturing a silicon dense film that can be used for manufacturing semiconductor devices.
- Non-Patent Document 1 discloses that after a polysilazane is applied to a substrate surface and dried, a SiON layer is formed by irradiation with a xenon excimer laser (wavelength: 172 nm) in an inert atmosphere. Patent Document 1 also discloses obtaining a high-performance gas barrier film by the same method. Thus, it has been studied to form a silicon film having excellent characteristics using a material having Si—N, Si—H, and N—H bonds.
- Patent Document 1 discloses a method of repeating a film production process a plurality of times in order to obtain a more stable film.
- the denseness may not be sufficient.
- Patent Document 2 after applying and drying polysilazane containing a catalyst on the surface of a substrate, vacuum ultraviolet rays (with a wavelength of less than 230 nm) and ultraviolet rays (with a wavelength of 230 to 300 nm) are applied simultaneously, before and after or in an atmosphere containing water vapor.
- a method of alternately irradiating to form a siliceous film is disclosed. In this case, however, there is room for improvement in the denseness of the silicon film.
- Patent Document 3 reports that when the oxygen content in the atmosphere is high during irradiation with vacuum ultraviolet light, the content of Si—O bonds in the formed film increases and the gas barrier performance deteriorates. ing. In order to achieve a higher gas barrier performance than this finding, it is considered that a film containing a large amount of Si—N bonds is preferable instead of a film containing a large amount of Si—O bonds.
- the present invention intends to provide a method for forming a silicon film having a high density and a low Si—O bond content in the coating.
- the method for forming a silicon dense film includes the following steps: (1) A film-forming composition preparation step of preparing a film-forming composition comprising a polymer having a silazane bond and a solvent, (2) A coating step of coating the film-forming composition on a substrate to form a coating film, (3) a first irradiation step in which the coating film is irradiated with light having a maximum peak wavelength of 160 to 179 nm; and (4) a maximum peak wavelength is used for the first irradiation step in the coating film after the first irradiation step. And a second irradiation step of irradiating light longer than the maximum peak wavelength of the light by 10 to 70 nm.
- the silicon dense film according to the present invention is formed by the above-described method.
- the Si—O bond content in the coating is low and the Si—N bond content is high, thereby forming a silicon dense film having high denseness and excellent gas barrier performance. Can do.
- Example 5 IR spectra after light irradiation treatment (broken line) and after superheated steam treatment (solid line).
- the IR spectrum after light irradiation processing in Example 1 (broken line) and after superheated steam processing (solid line).
- the silicon dense film is formed on one side or both sides of the substrate.
- substrate is not specifically limited, It selects from arbitrary things, such as a metal, an inorganic material, and an organic material. Bare silicon, a silicon wafer on which a thermal oxide film or the like is formed, if necessary, can also be used.
- the silicon dense film can be formed not only on one side of the substrate but also on both sides as required. In that case, it is necessary to select a substrate suitable for the purpose.
- a film-forming composition containing a polymer having a silazane bond and a solvent is applied to one or both of the substrate surfaces.
- the polymer having a silazane bond used in the present invention is not particularly limited and can be arbitrarily selected as long as the effects of the present invention are not impaired.
- a polysilazane compound is used.
- examples of the inorganic polysilazane include perhydropolysilazane including a linear structure having a structural unit represented by the general formula (I).
- perhydropolysilazanes can be produced by any conventionally known method, and basically include a chain portion and a cyclic portion in the molecule, and can be represented by the following chemical formula. is there.
- Organopolysilazane can also be used.
- organopolysilazane having a skeleton composed mainly of a structural unit represented by the following general formula (II) or a modified product thereof may be mentioned.
- R 1 , R 2 and R 3 are each independently a hydrogen atom, an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, an alkoxy group, an amino group, or a silyl group
- R 1 , R 2 and At least one of R 3 is a hydrogen atom.
- groups other than hydrogen atoms may be substituted with one or more halogen atoms such as fluorine, alkyl groups, alkoxy groups, amino groups, silyl groups, alkylsilyl groups, and the like.
- An amino group, an alkylaminoalkyl group, an alkylsilyl group, a dialkylsilyl group, an alkoxysilyl group, a dialkoxysilyl group, a trialkoxysilyl group, and the like are listed as groups that can be used for R 1 , R 2, and R 3 .
- the molecular weight of the polysilazane compound used in the present invention is not particularly limited.
- those having a polystyrene-reduced average molecular weight in the range of 1,000 to 20,000 are preferable, and those having a molecular weight in the range of 1,000 to 10,000 are more preferable. preferable.
- examples of the polymer having a silazane bond include metallosilazane, borosilazane, and siloxazan. These polymers can be used in combination of two or more.
- the film-forming composition according to the present invention comprises a solvent capable of dissolving the polymer.
- a solvent is not particularly limited as long as it can dissolve the polymer to be used, but specific examples of preferable solvents include the following: (A) aromatic compounds such as benzene, toluene, xylene, ethylbenzene, diethylbenzene, trimethylbenzene, triethylbenzene, tetrahydronaphthalene, etc.
- (C) alicyclic hydrocarbon compounds such as ethylcyclohexane, methylcyclohexane, cyclohexane, cyclohexene, p-menthane, decahydronaphthalene, dipentene, limonene, etc.
- ethers such as dipropyl ether, dibutyl ether, diethyl ether, dipentyl ether, dihexyl ether, methyl tertiary butyl ether (hereinafter referred to as MTBE), anisole and the like, and (e) ketones such as methyl isobutyl ketone ( Hereinafter referred to as MIBK).
- MIBK methyl isobutyl ketone
- MIBK methyl isobutyl ketone
- solvents may be used in the form of a mixture of two or more as appropriate in order to adjust the evaporation rate of the solvent, to reduce the harmfulness to the human body, or to adjust the solubility of each component.
- a commercially available solvent can also be used as such a solvent.
- a solvent Pegasol 3040, Exol D30, Exol D40, Exol D80, Solvesso 100, Solvesso 150, Isopar H, Isopar L (trade name: manufactured by ExxonMobil Corporation) and New Solvent A (trade name: manufactured by JX Nippon Oil & Energy Corporation) ), Shellsol MC311, Shellsol MC811, Sol Eight Deluxe, New Shell Bright Sol (trade name: manufactured by Shell Chemicals Japan Co., Ltd.) and the like are commercially available.
- the aromatic hydrocarbon content is preferably 30% by weight or less based on the total weight of the solvent mixture from the viewpoint of reducing the harmfulness to the human body.
- the composition for forming a film can also contain an amine compound or a metal complex compound. These compounds function as a catalyst when the composition applied on the substrate undergoes a curing reaction.
- any compound can be used.
- an aliphatic amine, an aromatic amine, or a heterocyclic amine can be preferably used.
- the aliphatic amine or aromatic amine may be a primary amine, secondary amine, or tertiary amine. These may have any number of nitrogen atoms, such as monoamine, diamine, or triamine.
- the heterocyclic amine include compounds containing a pyrrole ring, a pyridine ring, a pyrazine ring, a pyrimidine ring, a triazole ring, and the like. These amine compounds may be substituted with any substituent, for example, a group selected from the group consisting of an alkoxy group, an alkylene group, a silyl group, and an alkylsilyl group.
- preferred amine compounds include dipropylamine, diisopropylamine, tripropylamine, butylamine, dibutylamine, tributylamine, isobutylamine, diisobutylamine, tert-butylamine, pentylamine, tripentylamine hexylamine, N-methyl Hexylamine, N, N-dimethylhexylamine, N, N-dimethyl-2-ethylhexylamine, heptylamine, octylamine, di-n-octylamine N-methyl di-n-octylamine, tri-n-octylamine, N, N, N ′, N′-tetramethyldiaminomethane, N, N′-dimethylethylenediamine, N, N, N ′, N′-tetramethylethylenediamine, N, N, N ′, N′-tetramethyl-1, 3-propan
- the amine compound can be selected from any compounds that do not impair the effects of the present invention. However, when an alcohol amine or a part of the N-heterocyclic amine is used, Si is used for curing the coating. Care must be taken because -O bonds may increase.
- the metal complex compound any compound can be used as long as it can accelerate the curing reaction of the film.
- the metal is preferably selected from the group consisting of nickel, titanium, platinum, rhodium, cobalt, iron, iridium, aluminum, ruthenium, palladium, rhenium, and tungsten.
- the ligand selected from the group which consists of an acetylacetonato group, a carbonyl group, and a carboxylate group is preferable.
- the carboxylate group is a residue of a carboxylic acid selected from formic acid, acetic acid, propionic acid, butyric acid, octanoic acid, lauric acid, stearic acid, oleic acid, lactic acid, succinic acid, and citric acid Is preferred.
- a carboxylic acid selected from formic acid, acetic acid, propionic acid, butyric acid, octanoic acid, lauric acid, stearic acid, oleic acid, lactic acid, succinic acid, and citric acid Is preferred.
- preferable metal complex compounds include tris (acetylacetonato) aluminum, tris (acetylacetonato) iron, tris (acetylacetonato) rhodium, tris (acetylacetonato) cobalt, tris (acetylacetonato) ruthenium, Bis (acetylacetonato) palladium, hexacarbonyltungsten, dodecacarbonyltriruthenium, dodecacarbonyldirenium, palladium acetate, nickel benzoate, nickel octoate, nickel oleate, iron formate, cobalt benzoate, cobalt citrate, formate Examples include cobalt acid, rhodium triacetate, dirhodium tetraacetate, titanium oleate, aluminum gluconate, aluminum benzoate, and aluminum butyrate.
- composition according to the present invention may contain other additive components as necessary.
- examples of such components include viscosity modifiers and crosslinking accelerators.
- a phosphorus compound such as tris (trimethylsilyl) phosphate may be contained for the purpose of obtaining a sodium gettering effect when used in a semiconductor device.
- the film-forming composition according to the present invention is obtained by dissolving or dispersing the polymer and, if necessary, other additives in the solvent.
- the order in which each component is dissolved in the organic solvent is not particularly limited.
- the solvent can be replaced after the components are reacted.
- the content of each component described above varies depending on the intended use of the composition.
- the polymer content is preferably 0.1 to 40% by weight, more preferably 0.1 to 20% by weight, based on the total weight of the composition in order to form a film having a sufficient film thickness.
- the content is 0.1 to 10% by weight.
- the composition contains an amine compound, it is preferably a certain amount or more in order to sufficiently accelerate the curing reaction, and from the viewpoint of storage stability of the film forming composition, it may be a certain amount or less. preferable. Therefore, the content of the amine compound is preferably 0.005 to 0.50 mmol, more preferably 0.01 to 0.30 mmol, with respect to 1 g of the polymer.
- the composition contains a metal complex compound
- it is preferably a certain amount or more in order to sufficiently accelerate the curing reaction, and from the viewpoint of storage stability of the film-forming composition, it is a certain amount or less. Is preferred.
- the content of the metal complex compound is preferably 0.005 to 0.10 mmol, more preferably 0.01 to 0.06 mmol, with respect to 1 g of the polymer.
- a cosolvent such as anisole can be used in order to increase the solubility.
- a conventionally known method can be used as a method of applying the film forming composition to the substrate surface with the film forming composition as described above.
- a spin coat method, a dip method, a spray method, a roll coat method, a transfer method and the like can be mentioned.
- the spin coating method is particularly preferred.
- the thickness of the coated film after application is preferably set appropriately so that it can be efficiently cured upon irradiation with ultraviolet rays described below.
- the coating film formed on the substrate surface is dried as necessary to remove excess organic solvent. At this time, drying can be performed more efficiently by being performed at a relatively high temperature, but it is not preferable to add such heat energy from the outside because it leads to an increase in heat energy cost. Therefore, drying is preferably performed without applying heat energy. However, if drying is performed at a high temperature, the drying temperature is preferably 150 ° C. or less, and more preferably 100 ° C. or less.
- drying can be performed under reduced pressure. That is, by applying a negative pressure to the substrate after coating with a vacuum pump, a rotary pump, or the like, evaporation of the solvent in the coating film is accelerated, and drying can be promoted.
- an inert gas such as nitrogen can be sprayed onto the coating film from which excess solvent has been removed by drying.
- an inert gas such as nitrogen can be sprayed onto the coating film from which excess solvent has been removed by drying.
- the deposits on the surface of the coating film can be removed to increase the efficiency of light irradiation.
- the solvent etc. adhering to the surface can also be removed by irradiating infrared rays.
- the coated film thus obtained is subsequently subjected to a light irradiation process.
- the light irradiation conditions in the first irradiation step or the first irradiation step are appropriately selected according to the thickness, composition, hardness, etc. of the gas barrier coating to be formed.
- the light irradiated in the first irradiation step needs to have a maximum peak wavelength of 160 to 179 nm, preferably 165 to 175 nm. It is considered that the first irradiation step promotes curing near the surface of the coating film (details will be described later).
- any light source can be used as long as it can emit light of the above-mentioned wavelength, but a xenon excimer laser is typically used.
- a lamp that emits light in a wide wavelength range only necessary irradiation light can be used for irradiation by a filter or a spectroscope.
- the light irradiated in the second irradiation step needs to have a maximum peak wavelength longer than the maximum peak wavelength of the light used in the first irradiation step and not more than 230 nm, and is preferably 180 to 230 nm. . It is thought that hardening of the deep layer part of a coating film is accelerated
- the maximum wavelength of the light used in the second irradiation step may be longer than the light used in the first irradiation step, but if the difference between the maximum peak wavelengths is too small, the first irradiation step and the second irradiation step are performed.
- the difference of the maximum peak wavelength of the light used by a 1st irradiation process and a 2nd irradiation process is 10 nm or more, and it is more preferable that it is 15 nm or more.
- the wavelength of the light irradiated at this time is not particularly limited. Since the portion where curing is accelerated in the depth direction in the coating film varies depending on the wavelength of the light to be irradiated, the wavelength of the light to be irradiated can be selected according to the purpose. That is, by irradiating light having a longer wavelength, curing of a deeper portion of the coating film can be promoted, and by irradiating light having a shorter wavelength, the shallower portion of the coating film already cured once can be accelerated. Curing can be further promoted. That is, after the second irradiation step, irradiation can be performed any number of times with light having an arbitrary wavelength.
- the third irradiation step in which the coating film after the second irradiation step is irradiated with light whose maximum peak wavelength is longer than the maximum peak wavelength of the light used in the second irradiation step.
- curing can be promoted from a shallow part to a deep part of the coating film, and the denseness of the entire coating film can be improved. Since the maximum peak wavelength of the light used here is longer than the maximum peak wavelength of the light used in the second irradiation step, curing of a deeper portion of the coating film is promoted also by the second irradiation step.
- the light used in the third irradiation step is preferably light that is 10 nm to 60 nm longer than the maximum peak wavelength of the light used in the second irradiation step.
- Any light source may be used as the light source used in each irradiation step as long as it can emit light of a specified wavelength.
- a lamp that emits light in a relatively wide wavelength range such as an ultraviolet lamp or a mercury lamp, can be used to irradiate only necessary irradiation light with a filter or a spectroscope.
- the formed film when light with a wavelength of 230 nm is first irradiated and then with light with a wavelength of 172 nm, the formed film has a high Si—O content and a low Si—N content.
- the atmosphere for light irradiation is arbitrarily selected according to the composition of the target film, but it is preferable to perform light irradiation in an atmosphere in which oxygen does not permeate into the film, that is, an atmosphere with little oxygen.
- the oxygen content in the atmosphere is preferably 1000 ppm or less, and more preferably 100 ppm or less.
- light irradiation can be performed in a vacuum or under reduced pressure, or in an inert gas atmosphere. It is also effective to perform light irradiation after introducing an inert gas after reducing the atmosphere.
- the inert gas nitrogen, argon, helium, a mixed gas thereof, or the like is used.
- nitrogen is preferably used from the viewpoint of handleability.
- the nitrogen gas is inactive and is not taken into the film and does not increase the composition ratio of nitrogen.
- the light irradiation can be performed not only in a sealed container but also in an inert gas flow.
- ultraviolet irradiation can be performed in a mixed gas of ammonia, dinitrogen monoxide, and an inert gas thereof.
- ammonia or dinitrogen monoxide can serve as a nitrogen source when forming a film having a high Si—N content. Therefore, by using these, the Si—N content in the film can be increased.
- the coating can be heated simultaneously with the irradiation. Such heating can further accelerate the curing reaction.
- the heating method is not particularly limited, and any method such as a method of heating a stage or the like on which a substrate is placed, a method of heating an atmospheric gas, or the like can be selected.
- the polymer containing a silazane bond in the coating film is cured.
- Whether the curing reaction is proceeding can be confirmed by, for example, FT-IR. That is, when the conversion reaction proceeds, corresponding to the existing set of 3350 cm -1 and 1200 cm N-H bonds in based absorption in the vicinity -1, and absorption based on Si-H bonds in the 2200 cm -1 before conversion peak Thus, it can be confirmed that the curing reaction has progressed.
- the gas barrier film thus formed is excellent in stability, denseness, transparency, etc., so that it can be used for a gas barrier film such as a semiconductor device, as well as a protective film or an insulating film. It can also be used. It can also be used for a top anti-reflection film or a bottom anti-reflection film in a semiconductor manufacturing process.
- a film is formed as an antireflection film on the resist layer or on the substrate side by the method of the present invention in order to prevent reflection and interference in the resist layer.
- the coating according to the present invention is also suitable for use as such an antireflection film, particularly as a bottom antireflection film formed on the substrate side of the resist layer.
- the obtained product was filtered under reduced pressure using a Buchner funnel under a dry nitrogen atmosphere to obtain 1200 ml of a filtrate.
- pyridine was distilled off using an evaporator, 40 g of perhydropolysilazane was obtained.
- the number average molecular weight of the obtained perhydropolysilazane was measured by GPC (developing solution: CHCl 3 ), it was 800 in terms of polystyrene.
- the wave number (cm ⁇ 1 ) was 3350, and the absorption based on NH near 1200: the absorption based on Si—H of 2170: Si—N—Si of 1020 to 820 It was confirmed to show absorption based on.
- the film forming composition to which the additive described in Table 1 or 2 was added was adjusted to the film forming composition by the following methods.
- the composition for forming a film containing an amine compound is prepared by introducing 2.5 g of synthesized perhydropolysilazane and 30.0 g of dibutyl ether into a glass beaker having a capacity of 100 ml, and an amine compound in a glass beaker having a capacity of 50 ml. It prepared by mixing a fixed amount and what introduce
- a composition for forming a film containing a metal complex compound is obtained by introducing 2.5 g of synthesized perhydropolysilazane and 46.25 g of dibutyl ether into a glass beaker with a capacity of 100 ml, and a metal complex compound place in a glass bottle with a capacity of 5 ml. It prepared by mixing a fixed quantity and what introduce
- the prepared film forming composition was applied to a Si wafer having a diameter of 4 inches and a thickness of 0.5 mm using a spin coater. After coating, the film was dried on a hot plate at 80 ° C. for 3 minutes as necessary.
- the coated wafer was placed in an exposure apparatus, nitrogen was introduced into the apparatus to reduce the oxygen concentration to 100 ppm or less, and the wafer was irradiated with light having a maximum peak wavelength of 172 nm, 190 nm, 230 nm, or 365 nm.
- the illumination of each light 5mW / cm 2, 16mW / cm 2, 3.5mW / cm 2, was 3.7 W / cm 2.
- the illuminance is measured by the UV integrated light meter UIT-250 with the light receiver VUV-S172 (when the light source wavelength is 172 nm or 190 nm), UVD-S254 (when the light source wavelength is 230 nm), or UVD-S365 (when the light source wavelength is 365 nm). ) (Both trade names, manufactured by USHIO INC.).
- FT-IR measurement was performed, and the IR spectrum of the coating film after the irradiation treatment was measured.
- the film thickness of the coating film was measured with an ellipsometer. The film thickness was about 100 nm.
- the IR spectrum after the irradiation treatment and the IR spectrum after the curing treatment with superheated steam were compared to evaluate whether a dense and stabilized gas barrier film was formed.
- the peak intensity derived from the Si—O component in the vicinity of 1000 to 1200 cm ⁇ 1 in the IR spectrum is compared before and after the superheated steam treatment, and the peak intensity is almost the same as A and A.
- a sample having a slight peak change amount was designated as B, and a sample having a large peak and sufficiently confirmed change was designated as C.
- FIGS. 1, 2, and 3 correspond to Example 5, Example 1, and Example 37, and correspond to evaluation levels A, B, and C, respectively.
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Abstract
Description
また特許文献2には、触媒を含むポリシラザンを基材表面に塗布および乾燥した後、水蒸気を含む雰囲気中において、真空紫外線(波長230nm未満)及び紫外線(波長230~300nm)を同時、相前後または交互に照射し、シリカ質膜を形成する方法が開示されている。しかし、この場合もケイ素質膜の緻密性には改良の余地があった。
(1)シラザン結合を有するポリマーと、溶媒とを含んでなる被膜形成用組成物を調製する、被膜形成用組成物調製工程、
(2)前記被膜形成用組成物を基板上に塗布して塗膜を形成させる塗布工程、
(3)前記塗膜に、最大ピーク波長が160~179nmである光を照射する第一照射工程、および
(4)第一照射工程後の塗膜に、最大ピーク波長が第一照射工程に用いた光の最大ピーク波長よりも10~70nm長い光を照射する第二照射工程
を含んでなることを特徴とするものである。
(a)芳香族化合物、例えば、ベンゼン、トルエン、キシレン、エチルベンゼン、ジエチルベンゼン、トリメチルベンゼン、トリエチルベンゼン、テトラヒドロナフタレン等、
(b)飽和炭化水素化合物、例えばn-ペンタン、i-ペンタン、n-ヘキサン、i-ヘキサン、n-ヘプタン、i-ヘプタン、n-オクタン、i-オクタン、n-ノナン、i-ノナン、n-デカン、i-デカン等、
(c)脂環式炭化水素化合物、例えばエチルシクロヘキサン、メチルシクロヘキサン、シクロヘキサン、シクロヘキセン、p-メンタン、デカヒドロナフタレン、ジペンテン、リモネン等、
(d)エーテル類、例えばジプロピルエーテル、ジブチルエーテル、ジエチルエーテル、、ジペンチルエーテル、ジヘキシルエーテル、メチルターシャリーブチルエーテル(以下、MTBEという)、アニソール等、および
(e)ケトン類、例えばメチルイソブチルケトン(以下、MIBKという)等。
これらのうち、(b)飽和炭化水素化合物、(c)脂環式炭化水素化合物、(d)エーテル類、および(e)ケトン類が好ましい。
内容積1リットルの四つ口フラスコにガス吹き込み管、メカニカルスターラー、ジュワーコンデンサーを装着した。フラスコ内部を脱酸素した乾燥窒素で置換した後、脱気した乾燥ピリジンを1500ml入れ、これを氷冷した。次に、ジクロロシラン100gを加えた。白色固体状のアダクト(SiH2Cl2・2C5H5N)が生成した。反応混合物を氷冷し、撹拌しながらアンモニア70gを吹き込んだ。引き続き、乾燥窒素を液層に30分間吹き込み、余剰のアンモニアを除去した。
容量100mlのガラス製ビーカーに、合成したペルヒドロポリシラザン2.5gとジブチルエーテル47.5gとを導入し、3分間乾燥窒素を送り込むことでバブリング撹拌を行って、被膜形成用組成物を調製した。
調製した被膜形成用組成物を、それぞれ直径4インチ厚さ0.5mmのSiウェハにスピンコーターを用いて、塗布した。塗布後、必要に応じて80℃のホットプレート上で、3分間、被膜を乾燥させた。
照射処理後に、FT-IR測定を行い、照射処理後の塗膜のIRスペクトルを測定した。
また、エリプソメーターにて 塗膜の膜厚を測定した。膜厚はいずれも100nm程度であった。
Claims (19)
- 下記の工程:
(1)シラザン結合を有するポリマーと、溶媒とを含んでなる被膜形成用組成物を調製する、被膜形成用組成物調製工程、
(2)前記被膜形成用組成物を基板上に塗布して塗膜を形成させる塗布工程、
(3)前記塗膜に、最大ピーク波長が160~179nmである光を照射する第一照射工程、および
(4)第一照射工程後の塗膜に、最大ピーク波長が第一照射工程に用いた光の最大ピーク波長よりも10~70nm長い光を照射する第二照射工程
を含んでなることを特徴とする、ケイ素質緻密膜を形成する方法。 - (4)の工程が
前記第二照射工程において、最大ピーク波長が180~230nmである光を照射する、請求項1に記載の方法。 - 前記第一照射工程において、最大ピーク波長が165~175nmである光を照射する、請求項1または2に記載の方法。
- 第二照射工程の後に、
(5)第二照射工程後の塗膜に、最大ピーク波長が第二照射工程に用いた光の最大ピーク波長よりも10nm~60nm長い光を照射する第三照射工程
をさらに含んでなる請求項1~3のいずれか1項に記載の方法。 - 第三照射工程において、最大ピーク波長が180nm~230nmである光を照射する、請求項4に記載の方法。
- 前記シラザン結合を有するポリマーがポリシラザンである、請求項1~5いずれか1項に記載の方法。
- ポリシラザンがぺルヒドロポリシラザンである請求項6に記載の方法。
- ポリシラザンがオルガノポリシラザンである請求項6に記載の方法。
- 被膜形成用組成物が、添加剤をさらに含んでなる、請求項1~5のいずれか1項に記載の方法。
- 前記添加剤がアミン化合物である請求項9に記載の方法。
- 前記アミン化合物が、モノアミン化合物、ジアミン化合物、アリルアミン化合物、ベンジルアミン化合物、ピロール化合物、ピリジン化合物、ピラジン化合物、アルコキシアルキルアミン化合物、アミノアルキルエーテル化合物、およびジシラザン化合物からなる群から選択される、請求項10に記載の方法。
- 前記添加剤が金属錯体化合物である、請求項9に記載の方法。
- 前記金属錯体化合物が、ニッケル、チタン、白金、ロジウム、コバルト、鉄、コバルト、イリジウム、アルミニウム、ルテニウム、パラジウム、レニウム、およびタングステンからなる群から選択される金属を含有するものである、請求項12に記載の方法。
- 前記金属錯体化合物が、アセチルアセトナト基、カルボニル基もしくはカルボキシレート基を有するものである、請求項12に記載の方法。
- 前記カルボキシレート基が、ぎ酸、酢酸、プロピオン酸、酪酸、オクタン酸、ラウリン酸、ステアリン酸、オレイン酸、乳酸、コハク酸、およびクエン酸から選択されるカルボン酸の残基である、請求項14に記載の方法。
- 各照射工程が不活性ガス雰囲気下で行われる、請求項1~15のいずれか1項に記載の方法。
- 前記不活性ガス雰囲気の酸素濃度が1000ppm以下である、請求項16に記載の方法。
- 前記不活性ガス雰囲気が窒素ガス雰囲気である、請求項16または17に記載の方法。
- 請求項1~18のいずれか1項に記載の方法で製造されたことを特徴とするケイ素質緻密膜。
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EP2907587A4 (en) | 2016-07-06 |
TWI585161B (zh) | 2017-06-01 |
KR20150068986A (ko) | 2015-06-22 |
EP2907587B1 (en) | 2017-06-21 |
JP2014077082A (ja) | 2014-05-01 |
CN104718030A (zh) | 2015-06-17 |
TW201425482A (zh) | 2014-07-01 |
EP2907587A1 (en) | 2015-08-19 |
CN104718030B (zh) | 2017-03-08 |
US9534145B2 (en) | 2017-01-03 |
US20150252222A1 (en) | 2015-09-10 |
JP6017256B2 (ja) | 2016-10-26 |
KR101935770B1 (ko) | 2019-01-08 |
SG11201501993QA (en) | 2015-05-28 |
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