WO2021200218A1 - 原子層堆積法用薄膜形成用原料及び薄膜の製造方法 - Google Patents
原子層堆積法用薄膜形成用原料及び薄膜の製造方法 Download PDFInfo
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- WO2021200218A1 WO2021200218A1 PCT/JP2021/011088 JP2021011088W WO2021200218A1 WO 2021200218 A1 WO2021200218 A1 WO 2021200218A1 JP 2021011088 W JP2021011088 W JP 2021011088W WO 2021200218 A1 WO2021200218 A1 WO 2021200218A1
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02612—Formation types
- H01L21/02617—Deposition types
- H01L21/0262—Reduction or decomposition of gaseous compounds, e.g. CVD
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02612—Formation types
- H01L21/02617—Deposition types
- H01L21/02623—Liquid deposition
- H01L21/02628—Liquid deposition using solutions
Definitions
- the present invention relates to a raw material for forming a thin film for an atomic layer deposition method containing a gallium compound or an indium compound having a specific structure, and a method for producing a thin film containing a gallium atom or an indium atom using the raw material for forming a thin film. ..
- the raw material for forming a thin film containing gallium element or indium element exhibits specific electrical characteristics, and its application to optoelectronic engineering applications such as semiconductor elements, solar cells, and LEDs is particularly remarkable.
- a method for producing a thin film As a method for producing a thin film, a sputtering method, an ion plating method, a coating thermal decomposition method, a metal organic compound decomposition (MOD: Metal Organic Decomposition) method such as a solgel method, a chemical vapor deposition (CVD) method, etc. Can be mentioned. Among these, atoms are a type of chemical vapor deposition method because they have many advantages such as excellent composition controllability, step coverage, suitable for mass production, and hybrid integration.
- the Atomic Layer Deposition (ALD) method is the optimal manufacturing process.
- the thin film forming raw material applicable to the ALD method has a sufficiently wide temperature region called an ALD window. It is necessary. Therefore, it is common general knowledge in the technical field that even a thin film forming raw material that can be used in the CVD method is often not suitable for the ALD method.
- Patent Document 1 discloses that an oxide film can be formed by using trimethylgallium, triethylgallium, trimethylindium or the like as a raw material for forming a thin film for an atomic layer deposition method.
- Patent Document 2 proposes a production method for forming a metal thin film using dialkylamidinate indium, dialkylguanidineate indium, or the like.
- Patent Document 3 discloses that an indium-containing thin film can be formed by the MOCVD method using a ⁇ -diketonatoindium complex.
- Patent Document 4 describes a gallium-doped silicon nitride film using metal precursors such as gallium chloride, trimethylgallium, triethylgallium, tris (dimethylamino) gallium, tris (diethylamino) gallium, and tris (ethylmethylamino) gallium. A method of forming is proposed.
- the raw material for forming a thin film for the atomic layer deposition method is required to have excellent thermal stability and to be able to produce a high quality thin film.
- Compounds such as trialkyl gallium, trialkyl indium, dialkyl aminated indium, dialkyl guanidine indium, and trihalide gallium disclosed in Patent Documents 1 and 2 have insufficient thermal stability. It was difficult to use to form a high quality thin film.
- Patent Document 3 does not mention at all whether or not the ⁇ -diketonatoindium complex can be applied to the ALD method.
- Patent Document 4 describes that a gallium nitride layer is deposited by the ALD method using trimethylgallium, but since trimethylgallium has insufficient thermal stability, a high-quality thin film is formed. Was difficult.
- the present invention is a method for producing a thin film using a raw material for forming a thin film for atomic layer deposition and a raw material for forming the thin film, which contains a compound having excellent thermal stability and can produce a high-quality thin film.
- the purpose is to provide.
- the present invention is a raw material for forming a thin film for the atomic layer deposition method, which contains a compound represented by the following general formula (1).
- R 1 and R 2 each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms
- L is represented by the following general formula (L-1) or (L-2). It represents a group represented, and M represents an indium atom or a gallium atom.
- M represents an indium atom or a gallium atom.
- a part or all of the hydrogen atom may be substituted with a fluorine atom.
- R 11 and R 12 independently represent a hydrogen atom, a fluorine atom, an alkyl group having 1 to 5 carbon atoms, or an alkoxy group having 1 to 5 carbon atoms, and * indicates , Represents the connection position with M in the general formula (1).
- the alkyl group a part or all of the hydrogen atom may be substituted with a fluorine atom.
- R 21 to R 23 independently represent a hydrogen atom, a fluorine atom, or an alkyl group having 1 to 5 carbon atoms, and * represents M in the general formula (1). Represents the connection position of. However, R 21 and R 22 are different groups. In the alkyl group, a part or all of the hydrogen atom may be substituted with a fluorine atom.
- the present invention is a method for producing a thin film containing an indium atom or a gallium atom on the surface of a substrate, wherein the compound in a raw material gas obtained by vaporizing the raw material for forming a thin film for an atomic layer deposition method is used.
- Production of a thin film including a step of adsorbing it on the surface of a substrate to form a precursor thin film and a step of reacting the precursor thin film with a reactive gas to form a thin film containing indium atom or gallium atom on the surface of the substrate. The method.
- the raw material for forming a thin film for an atomic layer deposition method which contains a compound having excellent thermal stability and can produce a high-quality thin film.
- the raw material for forming a thin film for the atomic layer deposition method of the present invention can form a high-quality thin film by the ALD method.
- the raw material for forming a thin film for the atomic layer deposition method of the present invention contains a compound represented by the above general formula (1).
- examples of the alkyl group having 1 to 5 carbon atoms represented by R 1 and R 2 include a methyl group, an ethyl group, an n-propyl group, an isopropyl group and an n-butyl group.
- examples thereof include sec-butyl group, tert-butyl group, isobutyl group, n-pentyl group, sec-pentyl group, tert-pentyl group, isopentyl group, neopentyl group and the like.
- alkyl group in which some or all hydrogen atoms are substituted with a fluorine atom examples include a fluoromethyl group, a difluoromethyl group, a trifluoromethyl group, a fluoroethyl group, a difluoroethyl group, a trifluoroethyl group, and a pentafluoro.
- examples thereof include an ethyl group, a fluoropropyl group, a heptafluoropropyl group, a fluoropentyl group, and an undecylfluoropentyl group.
- the alkyl group having 1 to 5 carbon atoms represented by R 11 , R 12 and R 21 to R 23 has a general formula.
- the same ones represented by R 1 and R 2 in (1) can be mentioned.
- examples of the alkoxy group having 1 to 5 carbon atoms represented by R 11 and R 12 include a methoxy group, an ethoxy group, an isopropoxy group, and a butoxy group. , Se-butoxy group, tert-butoxy group, isobutoxy group, n-pentyloxy group, sec-pentyloxy group, tert-pentyloxy group, isopentyloxy group, neopentyloxy group and the like.
- the compound in which R 1 and R 2 are methyl groups is preferable because it has a low melting point and a high vapor pressure, and thus can form a thin film with high productivity.
- the following compound No. 1-Compound No. 80 is mentioned, but the present invention is not limited to these compounds.
- the following compound No. 1-Compound No. In 80 "Me” represents a methyl group, "Et” represents an ethyl group, “iPr” represents an isopropyl group, “tBu” represents a tert-butyl group, and "CF 3 " represents a tert-butyl group.
- the compound represented by the general formula (1) can be produced by using a well-known method.
- a compound in which M is indium, R 1 and R 2 are methyl groups, and L is a group represented by (L-1) contains trimethylindium and a ⁇ -diketone compound in a solvent. It can be obtained by removing the solvent after the reaction and purifying by distillation.
- the compound in which M is indium, R 1 and R 2 are methyl groups, and L is a group represented by (L-2) reacts trimethylindium with a dialkylamidine compound in a solvent. It can be obtained by removing the solvent and purifying by distillation.
- the melting point of the compound represented by the above general formula (1) is set. , It is preferably less than 100 ° C., and more preferably it is a liquid at room temperature.
- the raw material for forming a thin film for the atomic layer deposition method of the present invention may contain a compound represented by the above general formula (1), and its composition differs depending on the type of the target thin film. For example, when a thin film containing only gallium or indium as a metal is produced, the raw material for forming a thin film for the atomic layer deposition method of the present invention does not contain a metal compound other than the metal and a semi-metal compound. On the other hand, when producing a thin film containing a metal other than gallium and indium and / or a semimetal, the raw material for forming a thin film for the atomic layer deposition method of the present invention is in addition to the compound represented by the above general formula (1).
- the raw material for forming a thin film for the atomic layer deposition method of the present invention may further contain an organic solvent and / or a nucleophile, as will be described later.
- the form of the raw material for forming a thin film for the atomic layer deposition method of the present invention is appropriately selected depending on the method such as the transportation and supply method of the atomic layer deposition method used.
- raw material container in which the raw material for forming a thin film for the atomic layer deposition method of the present invention is stored. It is vaporized to be a raw material gas, and the raw material gas is also referred to as a film forming chamber in which a substrate is installed (hereinafter, referred to as "deposition reaction part") together with a carrier gas such as argon, nitrogen, and helium which is used as needed.
- a carrier gas such as argon, nitrogen, and helium which is used as needed.
- the raw material for forming a thin film for the atomic layer deposition method of the present invention is transported to the vaporization chamber in the state of a liquid or solution, and vaporized by heating and / or depressurizing in the vaporization chamber.
- a liquid transport method in which the raw material gas is introduced into the film forming chamber as a gas.
- the compound itself represented by the above general formula (1) can be used as a raw material for forming a thin film for the atomic layer deposition method.
- the compound itself represented by the general formula (1) or a solution obtained by dissolving the compound in an organic solvent can be used as a raw material for forming a thin film for the atomic layer deposition method of the present invention.
- These raw materials for forming a thin film for atomic layer deposition may further contain other precursors, nucleophiles and the like.
- a method of vaporizing and supplying the raw material for forming a thin film for the atomic layer deposition method independently (hereinafter, also referred to as "single source method") and the multi-component raw material.
- a method of vaporizing and supplying a mixed raw material in which is mixed in advance with a desired composition (hereinafter, may be referred to as a “cocktail sauce method”).
- a mixture of the compound represented by the above general formula (1) and another precursor or a mixed solution obtained by dissolving the mixture in an organic solvent is used as a raw material for forming a thin film for the atomic layer deposition method of the present invention. be able to.
- These raw materials for forming a thin film for the atomic layer deposition method may further contain a nucleophile or the like.
- organic solvent a well-known general organic solvent can be used without any particular limitation.
- organic solvent include acetate esters such as ethyl acetate, butyl acetate and methoxyethyl acetate; ethers such as tetrahydrofuran, tetrahydropyran, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, dibutyl ether and dioxane; methyl.
- Ketones such as butyl ketone, methyl isobutyl ketone, ethyl butyl ketone, dipropyl ketone, diiso butyl ketone, methyl amyl ketone, cyclohexanone, methyl cyclohexanone; hexane, cyclohexane, methylcyclohexane, dimethylcyclohexane, ethylcyclohexane, heptane, octane, toluene, Hydrocarbons such as xylene; 1-cyanopropane, 1-cyanobutane, 1-cyanohexane, cyanocyclohexane, cyanobenzene, 1,3-dicyanopropane, 1,4-dicyanobutane, 1,6-dicyanohexane, 1, Hydrocarbons having a cyano group such as 4-dicyanocyclohexane and 1,4-
- the total amount of the precursor in the raw material for forming a thin film for an atomic layer deposition method which is a solution obtained by dissolving a precursor in an organic solvent, is 0. It is preferably 0.01 to 2.0 mol / liter, particularly 0.05 to 1.0 mol / liter.
- the total amount of the precursor is defined by the above general formula (1) when the raw material for forming a thin film for the atomic layer deposition method of the present invention does not contain any other precursor other than the compound represented by the above general formula (1).
- the other precursor used together with the compound represented by the above general formula (1) is not particularly limited, and is used as a raw material for forming a thin film for the atomic layer deposition method.
- a well-known general precursor can be used.
- the other precursors described above may be one or two selected from the group consisting of compounds used as organic ligands such as alcohol compounds, glycol compounds, ⁇ -diketone compounds, cyclopentadiene compounds, and organic amine compounds. More than one kind, and compounds with silicon and metal can be mentioned.
- the metal species of pricasa include lithium, sodium, potassium, magnesium, calcium, samarium, barium, titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, iron, osmium, lutetium, and cobalt.
- Examples of the alcohol compound used as the organic ligand of the above-mentioned precursor include methanol, ethanol, propanol, isopropyl alcohol, butanol, sec-butyl alcohol, isobutyl alcohol, tert-butyl alcohol, pentyl alcohol and isopentyl alcohol.
- Alcohols such as tert-pentyl alcohols; 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol, 2- (2-methoxyethoxy) ethanol, 2-methoxy-1-methylethanol, 2-methoxy-1 , 1-dimethylethanol, 2-ethoxy-1,1-dimethylethanol, 2-isopropoxy-1,1-dimethylethanol, 2-butoxy-1,1-dimethylethanol, 2- (2-methoxyethoxy) -1 , 1-Dimethylethanol, 2-propoxy-1,1-diethylethanol, 2-sec-butoxy-1,1-diethylethanol, 3-methoxy-1,1-dimethylpropanol and other ether alcohols; dimethylaminoethanol, Ethylmethylaminoethanol, diethylaminoethanol, dimethylamino-2-pentanol, ethylmethylamino-2-pentanol, dimethylamino-2-methyl-2-pentanol, ethylmethyl
- glycol compound used as the organic ligand of the other precursors described above examples include 1,2-ethanediol, 1,2-propanediol, 1,3-propanediol, 2,4-hexanediol, and 2, 2-Dimethyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, 1,3-butanediol, 2,4-butanediol, 2,2-diethyl-1,3-butanediol , 2-Ethyl-2-butyl-1,3-propanediol, 2,4-pentanediol, 2-methyl-1,3-propanediol, 2-methyl-2,4-pentanediol, 2,4-hexane Examples thereof include diol, 2,4-dimethyl-2,4-pentanediol and the like.
- Examples of the ⁇ -diketone compound used as the organic ligand of the other precursors described above include acetylacetone, hexane-2,4-dione, 5-methylhexane-2,4-dione, and heptane-2,4-dione.
- cyclopentadiene compound used as the organic ligand of the other precursors described above examples include cyclopentadiene, methylcyclopentadiene, ethylcyclopentadiene, propylcyclopentadiene, isopropylcyclopentadiene, butylcyclopentadiene, sec-butylcyclopentadiene, and the like. Examples thereof include isobutylcyclopentadiene, tert-butylcyclopentadiene, dimethylcyclopentadiene, and tetramethylcyclopentadiene.
- Examples of the organic amine compound used as the organic ligand of the other precursors mentioned above include methylamine, ethylamine, propylamine, isopropylamine, butylamine, sec-butylamine, tert-butylamine, isobutylamine, dimethylamine, diethylamine and dipropyl. Examples thereof include amines, diisopropylamines, ethylmethylamines, propylmethylamines and isopropylmethylamines.
- a precursor when an alcohol compound is used as an organic ligand, a precursor can be produced by reacting the above-mentioned inorganic salt of a metal or a hydrate thereof with an alkali metal alkoxide of the alcohol compound.
- examples of the inorganic salt of the metal or the hydrate thereof include a halide of the metal, a nitrate and the like.
- examples of the alkali metal alkoxide include sodium alkoxide, lithium alkoxide, potassium alkoxide and the like.
- a compound whose thermal and / or oxidative decomposition behavior is similar to that of the compound represented by the above general formula (1) is preferable.
- the cocktail sauce method as the other precursors described above, in addition to the behavior of heat and / or oxidative decomposition being similar to that of the compound represented by the above general formula (1), deterioration due to a chemical reaction or the like during mixing is performed. A compound that does not cause
- the raw material for forming a thin film for the atomic layer deposition method of the present invention contains a nucleophile, if necessary, in order to improve the stability of the compound represented by the above general formula (1) and other precursors.
- a nucleophilic reagent include ethylene glycol ethers such as glyme, jigglime, triglime, and tetraglyme, 18-crown-6, dicyclohexyl-18-crown-6, 24-crown-8, and dicyclohexyl-24-crown-8.
- Dibenzo-24 Crown-8 and other crown ethers ethylenediamine, N, N'-tetramethylethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, 1,1,4,7,7- Polyamines such as pentamethyldiethylenetriamine, 1,1,4,7,10,10-hexamethyltriethylenetetramine, triethoxytriethyleneamine, cyclic polyamines such as cyclolam and cyclone, pyridine, pyrrolidine, piperidine, morpholine, N.
- -Heterocyclic compounds such as methylpyrrolidin, N-methylpiperidin, N-methylmorpholin, tetrahydrofuran, tetrahydropyran, 1,4-dioxane, oxazole, thiazole, oxathiolane, methyl acetoacetate, ethyl acetoacetate, acetoacetic acid-2- Examples thereof include ⁇ -ketoesters such as methoxyethyl or ⁇ -diketones such as acetylacetone, 2,4-hexanedione, 2,4-heptandione, 3,5-heptandione and dipivaloylmethane.
- the amount of these nucleophiles used is preferably in the range of 0.1 mol to 10 mol, more preferably in the range of 1 mol to 4 mol, based on 1 mol of the total amount of the precursor.
- the raw material for forming a thin film for the atomic layer deposition method of the present invention should contain as little as possible impurity metal elements other than the constituent components, impurity halogens such as impurity chlorine, and impurity organics.
- the impurity metal element content is preferably 100 ppb or less for each element, more preferably 10 ppb or less, and the total amount is preferably 1 ppm or less, more preferably 100 ppb or less.
- the impurity halogen content is preferably 100 ppm or less, more preferably 10 ppm or less, and even more preferably 1 ppm or less.
- the total amount of the impurity organic content is preferably 500 ppm or less, more preferably 50 ppm or less, still more preferably 10 ppm or less.
- water causes particles to be generated in the raw material for forming a thin film for the atomic layer deposition method and particles to be generated during thin film formation, the water content of each of the precursor, the organic solvent and the nucleophile is reduced. Therefore, it is better to remove as much water as possible before use.
- the water content of each of the precursor, the organic solvent and the nucleophile is preferably 10 ppm or less, more preferably 1 ppm or less.
- the raw material for forming a thin film for the atomic layer deposition method of the present invention preferably contains as little particles as possible in order to reduce or prevent particle contamination of the formed thin film.
- the number of particles larger than 0.3 ⁇ m is preferably 100 or less in 1 mL of the liquid phase, and is larger than 0.2 ⁇ m.
- the number of particles is more preferably 1000 or less in 1 mL of the liquid phase, and further preferably the number of particles larger than 0.2 ⁇ m is 100 or less in 1 mL of the liquid phase.
- the method for producing a thin film of the present invention is based on the ALD method using the raw material for forming a thin film for an atomic layer deposition method, and forms a raw material gas obtained by vaporizing the raw material for forming a thin film for an atomic layer deposition method.
- a step of introducing into a chamber (treatment atmosphere) raw material gas introduction step
- a step of adsorbing a gallium compound or an indium compound in the raw material gas on the surface of a substrate to form a precursor thin film precursor thin film forming step
- Examples of the material of the substrate include silicon; ceramics such as silicon nitride, titanium nitride, tantalum nitride, titanium oxide, titanium nitride, ruthenium oxide, zirconium oxide, hafnium oxide and lanthanum oxide; and glass; metals such as metallic cobalt. Be done.
- Examples of the shape of the substrate include plate-like, spherical, fibrous, and scaly shapes.
- the surface of the substrate may be flat or may have a three-dimensional structure such as a trench structure.
- the above-mentioned gas transport method, liquid transport method, and single source are used as a method of introducing the raw material gas obtained by vaporizing the raw material for forming a thin film for the atomic layer deposition method into the film forming chamber in which the substrate is installed. Law, cocktail sauce method, etc. can be mentioned.
- the reactive gas examples include oxidizing gases such as oxygen, ozone, nitrogen dioxide, nitrogen monoxide, water vapor, hydrogen peroxide, formic acid, acetic acid and anhydrous acetic acid, reducing gases such as hydrogen, monoalkylamines and dialkyls.
- oxidizing gases such as oxygen, ozone, nitrogen dioxide, nitrogen monoxide, water vapor, hydrogen peroxide, formic acid, acetic acid and anhydrous acetic acid
- reducing gases such as hydrogen, monoalkylamines and dialkyls.
- organic amine compounds such as amines, trialkylamines and alkylenediamines
- nitrided gases such as hydrazine and ammonia.
- the raw material for forming a thin film for the atomic layer deposition method of the present invention reacts well with oxygen, ozone and water vapor at a specifically low temperature, and therefore contains oxygen, ozone or water vapor as a reactive gas. It is preferable to use gas. It is more preferable to use a gas containing water vapor as the reactive gas in that a high-quality thin film having a small amount of residual carbon can be produced with high productivity.
- the raw material gas introduction step, the precursor thin film forming step, the exhaust step, the metal-containing thin film forming step, and the exhaust step are sequentially performed as one cycle, and the thickness of the thin film can be adjusted by repeating this cycle. ..
- each step of the method for producing a thin film of the present invention will be described.
- the raw material gas introduction step is a step of vaporizing the raw material for forming a thin film for the atomic layer deposition method of the present invention into a raw material gas, and introducing the raw material gas into a film forming chamber in which a substrate is installed.
- the preferable temperature and pressure for vaporizing the raw material for forming a thin film for the atomic layer deposition method are in the range of 0 ° C. to 200 ° C. and 1 Pa to 10,000 Pa.
- raw material container As a method for transporting and supplying the raw material for forming a thin film for the atomic layer deposition method, as shown in FIGS. 1 and 3, a container in which the raw material for forming a thin film for the atomic layer deposition method of the present invention is stored (hereinafter, “raw material container””. It is vaporized by heating and / or depressurizing in (referred to as) to form a raw material gas, and if necessary, the raw material gas is put into a thin film chamber in which a substrate is installed together with a carrier gas such as argon, nitrogen, and helium.
- a carrier gas such as argon, nitrogen, and helium
- the raw material for forming a thin film for the atomic layer deposition method is transported to the vaporization chamber in the form of a liquid or a solution, and heated and / or depressurized in the vaporization chamber.
- a liquid transport method in which the raw material gas is vaporized into a raw material gas and the raw material gas is introduced into the thin film forming chamber.
- the compound itself represented by the above general formula (1) can be used as a raw material for forming a thin film for the atomic layer deposition method.
- the compound itself represented by the general formula (1) or a solution obtained by dissolving the compound in an organic solvent can be used as a raw material for forming a thin film for the atomic layer deposition method.
- These raw materials for forming a thin film for the atomic layer deposition method may further contain a nucleophile or the like.
- the single source method and the cocktail sauce method described above can be used as the methods used in the raw material gas introduction step, but in the case of using any of the introduction methods.
- the raw material for forming a thin film for the atomic layer deposition method of the present invention is preferably vaporized at 0 ° C. to 200 ° C.
- the pressure in the raw material container and the pressure in the vaporization chamber are in the range of 1 Pa to 10,000 Pa. Is preferable.
- examples of the material of the substrate installed in the film forming chamber include silicon; ceramics such as silicon nitride, titanium nitride, tantalum nitride, titanium oxide, ruthenium oxide, zirconium oxide, hafnium oxide, and lanthanum oxide; glass.
- examples include metals such as metallic cobalt and metallic ruthenium.
- Examples of the shape of the substrate include plate-like, spherical, fibrous, and scaly shapes.
- the surface of the substrate may be flat or may have a three-dimensional structure such as a trench structure.
- the compound represented by the above general formula (1) is deposited (adsorbed) on the surface of the substrate in the raw material gas introduced into the film forming chamber in which the substrate is installed, and the surface of the substrate is formed.
- a precursor thin film is formed on the surface.
- the substrate may be heated or the inside of the film forming chamber may be heated to apply heat.
- the conditions for forming the precursor thin film are not particularly limited, and for example, the reaction temperature (base temperature), reaction pressure, deposition rate, and the like can be appropriately determined according to the type of the thin film forming raw material.
- the reaction temperature is preferably in the range of 0 ° C.
- the ALD window when the raw material for forming a thin film for the atomic layer deposition method of the present invention and the reactive gas are used in combination is generally in the range of 150 ° C. to 400 ° C.
- the reaction pressure is preferably 1 Pa to 10,000 Pa, more preferably 10 Pa to 1,000 Pa.
- the deposition rate can be controlled by the supply conditions (vaporization temperature, vaporization pressure), reaction temperature, and reaction pressure of the raw material for forming a thin film for the atomic layer deposition method. If the deposition rate is high, the characteristics of the obtained thin film may deteriorate, and if it is low, problems may occur in productivity. Therefore, 0.005 nm / min to 100 nm / min is preferable, and 0.01 nm / min to 50 nm / min. Minutes are more preferred.
- the raw material gas that has not been adsorbed on the surface of the substrate is exhausted from the film forming chamber.
- the raw material gas is completely exhausted from the film forming chamber, but it is not always necessary to completely exhaust the raw material gas.
- the exhaust method include a method of purging the inside of the system in the film forming chamber with an inert gas such as helium, nitrogen, and argon, a method of exhausting by depressurizing the inside of the system, and a method of combining these. ..
- the degree of pressure reduction is preferably in the range of 0.01 Pa to 300 Pa, more preferably in the range of 0.01 Pa to 100 Pa.
- Metal-containing thin film forming process In the metal-containing thin film forming step, after the exhaust step, a reactive gas is introduced into the film forming chamber and formed in the precursor thin film step by the action of the reactive gas or the action of the reactive gas and the action of heat. A metal-containing thin film is formed from the obtained precursor thin film.
- the reactive gas is an oxidizing gas
- a gallium oxide thin film or an indium oxide thin film is formed.
- the temperature at which heat is applied is preferably room temperature to 500 ° C, more preferably 100 ° C to 400 ° C.
- the pressure of the system (inside the film forming chamber) when this step is performed is preferably 1 Pa to 10,000 Pa, more preferably 10 Pa to 1,000 Pa.
- the raw material for forming a thin film for the atomic layer deposition method of the present invention has good reactivity with an oxidizing gas such as water vapor, it is possible to produce a high-quality metal-containing thin film having a small amount of residual carbon with high productivity. ..
- the reactive gas examples include oxidizing gases such as oxygen, ozone, nitrogen dioxide, nitrogen monoxide, water vapor, hydrogen peroxide, formic acid, acetic acid and anhydrous acetic acid, reducing gases such as hydrogen, monoalkylamines and dialkyls.
- oxidizing gases such as oxygen, ozone, nitrogen dioxide, nitrogen monoxide, water vapor, hydrogen peroxide, formic acid, acetic acid and anhydrous acetic acid
- reducing gases such as hydrogen, monoalkylamines and dialkyls.
- organic amine compounds such as amines, trialkylamines and alkylenediamines
- nitrided gases such as hydrazine and ammonia.
- the raw material gas introduction step, the precursor thin film forming step, the exhaust stroke, the metal-containing thin film forming step, and the exhaust step are carried out in order, and the deposition by a series of operations is regarded as one cycle, and this cycle is the required film thickness.
- this cycle is the required film thickness.
- energy such as plasma, light, or voltage may be applied, or a catalyst may be used.
- the time when the energy is applied and the time when the catalyst is used are not particularly limited, and for example, when the raw material gas is introduced in the raw material introduction step, when heating is performed in the precursor thin film forming step or the metal-containing thin film forming step, and when the system is exhausted. It may be at the time of exhausting the inside, at the time of introducing the oxidizing gas in the metal-containing thin film forming step, or during each of the above steps.
- annealing treatment may be performed in an inert atmosphere, an oxidizing atmosphere or a reducing atmosphere in order to obtain better electrical characteristics. If embedding is required, a reflow process may be provided.
- the temperature is preferably 200 ° C. to 1,000 ° C., more preferably 250 ° C. to 500 ° C.
- a well-known ALD device can be used as an apparatus for producing a thin film using the raw material for forming a thin film for the atomic layer deposition method of the present invention.
- the device include a device capable of bubbling and supplying a precursor as shown in FIG. 1 and a device having a vaporization chamber as shown in FIG.
- an apparatus capable of performing plasma treatment on the reactive gas can be mentioned.
- an apparatus capable of simultaneously processing a large number of sheets using a batch furnace can also be used.
- the thin film produced by using the raw material for forming a thin film for the atomic layer deposition method of the present invention includes metal, oxide ceramics, nitride ceramics, glass and the like by appropriately selecting other precursors, reactive gases and production conditions.
- the substrate can be coated to obtain a desired type of thin film. Since the thin film obtained by the present invention is excellent in electrical characteristics and optical characteristics, for example, an electrode material of a memory element typified by a DRAM element, a resistance film, an antimagnetic film used for a recording layer of a hard disk, and a polymer electrolyte fuel cell. It can be widely used in the production of catalyst materials for use.
- Example 1 Compound No. Synthesis of 9 To a 100 ml three-necked flask, 1.07 g (6.7 mmol) of trimethylindium and 15 ml of dehydrated tetrahydrofuran (THF) were added at room temperature, and N-ethyl-N'-tert-butyl-propioamidine 1. 05 g (6.7 mmol) was added dropwise under ice-cooling, and the mixture was stirred at room temperature for 19 hours. THF was distilled off in an oil bath at 70 ° C. and a slight reduced pressure.
- THF dehydrated tetrahydrofuran
- the pale yellow transparent liquid remaining in the flask was distilled under reduced pressure (40 Pa) to obtain 0.92 g (3.1 mmol, yield 46%) of the colorless transparent liquid as a distillate.
- the obtained colorless and transparent liquid was analyzed by 1 H-NMR and ICP-AES, and as a result, the compound No. 1 which was the target compound was obtained. It was confirmed that it was 9.
- the analysis results of the obtained colorless transparent liquid are shown below.
- Example 2 Compound No. Synthesis of 46 To a 100 ml three-necked flask, 0.98 g (6.1 mmol) of trimethylindium and 15 ml of dehydrated THF were added at room temperature, and 1.12 g (6.1 mmol) of dipivaloyl methane was added dropwise under ice cooling. , Stirred at room temperature for 20 hours. THF was distilled off in an oil bath at 70 ° C. and a slight reduced pressure. Then, the pale yellow transparent liquid remaining in the flask was distilled under reduced pressure (50 Pa) to obtain 1.32 g (4.0 mmol, yield 66%) of the colorless transparent liquid as a distillate.
- the obtained colorless and transparent liquid was analyzed by 1 H-NMR and ICP-AES, and as a result, the compound No. 1 which was the target compound was obtained. It was confirmed that it was 46.
- the analysis results of the obtained colorless transparent liquid are shown below.
- Example 3 Compound No. Synthesis of 66 To a 100 ml three-necked flask, 0.81 g (7.1 mmol) of trimethylgallium and 15 ml of dehydrated THF were added at room temperature, and 1.31 g (7.1 mmol) of dipivaloyl methane was added dropwise under ice cooling. , Stirred at room temperature for 20 hours. THF was distilled off in an oil bath at 70 ° C. and a slight reduced pressure. Then, the pale yellow transparent liquid remaining in the flask was distilled under reduced pressure (50 Pa) to obtain 1.25 g (4.4 mmol, yield 62%) of the colorless transparent liquid as a distillate.
- the obtained colorless transparent liquid was analyzed by 1 H-NMR and ICP-AES, and as a result, the compound No. 1 which was the target compound was obtained. It was confirmed that it was 66.
- the analysis results of the obtained colorless transparent liquid are shown below.
- Example 4 Compound No. 66 was used as a raw material for forming a thin film for the atomic layer deposition method, and a thin film was produced on the surface of a silicon wafer as a substrate under the following conditions using the ALD apparatus shown in FIG.
- the composition of the thin film was analyzed using X-ray electron spectroscopy, it was confirmed that the thin film was a thin film containing gallium oxide and the residual carbon content was less than the detection limit of 0.1 atom%.
- the film thickness of the thin film was measured using a scanning electron microscope method, the thin film formed on the surface of the silicon wafer was a smooth film of 10 nm, and the film thickness obtained per cycle was about 0. It was .02 nm.
- the reactive gas is introduced into the film forming chamber, and the precursor thin film and the reactive gas are reacted at a system pressure of 100 Pa for 0.2 seconds.
- Unreacted reactive gas and by-product gas are exhausted from the system by argon purging for 60 seconds.
- Example 5 Compound No. No. 9 was used as a raw material for forming a thin film for the atomic layer deposition method, and a thin film was produced on the surface of a silicon wafer as a substrate under the following conditions using the ALD apparatus shown in FIG.
- the composition of the thin film was analyzed using X-ray electron spectroscopy, it was confirmed that the thin film was a thin film containing indium oxide and the residual carbon content was less than the detection limit of 0.1 atom%.
- the film thickness of the thin film was measured using a scanning electron microscope method, the thin film formed on the surface of the silicon wafer was a smooth film of 20 nm, and the film thickness obtained per cycle was about 0. It was .04 nm.
- a reactive gas is introduced into the film forming chamber, and the precursor thin film and the reactive gas are reacted at a system pressure of 100 Pa for 0.2 seconds.
- Unreacted reactive gas and by-product gas are exhausted from the system by argon purging for 60 seconds.
- Example 6 Compound No. 46 was used as a raw material for forming a thin film for the atomic layer deposition method, and a thin film was produced on the surface of a silicon wafer as a substrate under the following conditions using the ALD apparatus shown in FIG.
- the composition of the thin film was analyzed using X-ray electron spectroscopy, it was confirmed that the thin film was a thin film containing indium oxide and the residual carbon content was less than the detection limit of 0.1 atom%.
- the film thickness of the thin film was measured using a scanning electron microscope method, the thin film formed on the surface of the silicon wafer was a smooth film of 16 nm, and the film thickness obtained per cycle was about 0. It was .03 nm.
- a reactive gas is introduced into the film forming chamber, and the precursor thin film and the reactive gas are reacted at a system pressure of 100 Pa for 0.2 seconds.
- Unreacted reactive gas and by-product gas are exhausted from the system by argon purging for 60 seconds.
- Comparative Example 1 Comparative compound 4 (tri (dimethylamino) gallium) was used as a raw material for forming a thin film by an atomic layer deposition method, and the silicon wafer as a substrate was subjected to the same conditions as in Example 4 except that the temperature of the raw material container was changed to 80 ° C. A thin film was produced on the surface.
- the composition of the thin film was analyzed using X-ray electron spectroscopy, the thin film was a thin film containing gallium oxide, but residual carbon was detected.
- the state of the thin film was observed using the scanning electron microscope method, the thin film formed on the surface of the silicon wafer was not smooth and the film thickness could not be measured.
- the raw material for forming a thin film for the atomic layer deposition method of the present invention exhibits excellent thermal stability and high vapor pressure. It was confirmed that a high-quality metal-containing thin film can be produced by using the raw material for forming a thin film for the atomic layer deposition method of the present invention.
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Abstract
Description
即ち、本発明は、下記一般式(1)で表される化合物を含有する原子層堆積法用薄膜形成用原料である。
原料ガス導入工程は、本発明の原子層堆積法用薄膜形成用原料を気化させて原料ガスとし、該原料ガスを基体が設置された成膜チャンバーへ導入する工程である。
原子層堆積法用薄膜形成用原料を気化させる際の好ましい温度及び圧力は、0℃~200℃、1Pa~10,000Paの範囲内である。
前駆体薄膜形成工程では、基体が設置された成膜チャンバー内に導入した原料ガス中の、上記一般式(1)で表される化合物を基体の表面に堆積(吸着)させて、基体の表面に前駆体薄膜を形成する。このとき、基体を加熱するか又は成膜チャンバー内を加熱して熱を加えてもよい。前駆体薄膜を形成する条件は、特に限定されず、例えば、反応温度(基体温度)、反応圧力、堆積速度等を薄膜形成用原料の種類に応じて適宜決めることができる。反応温度は、0℃~400℃の範囲が好ましく、本発明の原子層堆積法用薄膜形成用原料が充分に反応する温度である150℃~400℃の範囲がより好ましい。なお、本発明の原子層堆積法用薄膜形成用原料と反応性ガスとを組み合わせて使用した場合のALDウィンドウは、概ね150℃~400℃の範囲である。反応圧力は、1Pa~10,000Paが好ましく、10Pa~1,000Paがより好ましい。
前駆体薄膜を形成後、基体の表面に吸着しなかった原料ガスを成膜チャンバー内から排気する。この際、原料ガスが成膜チャンバー内から完全に排気されるのが理想であるが、必ずしも完全に排気する必要はない。排気方法としては、例えば、ヘリウム、窒素、アルゴン等の不活性ガスにより成膜チャンバー内の系内をパージする方法、系内を減圧することで排気する方法、これらを組み合わせた方法等が挙げられる。減圧する場合の減圧度は、0.01Pa~300Paの範囲が好ましく、0.01Pa~100Paの範囲がより好ましい。
金属含有薄膜形成工程では、排気工程後、成膜チャンバー内に反応性ガスを導入して、反応性ガスの作用又は反応性ガスの作用と熱の作用とにより、先の前駆体薄膜工程で形成された前駆体薄膜から、金属含有薄膜を形成する。反応性ガスが酸化性ガスの場合、酸化ガリウム薄膜又は酸化インジウム薄膜が形成される。本工程において、熱を作用させる場合の温度は、室温~500℃が好ましく、100℃~400℃がより好ましい。本工程が行われる際の系(成膜チャンバー内)の圧力は、1Pa~10,000Paが好ましく、10Pa~1,000Paがより好ましい。本発明の原子層堆積法用薄膜形成用原料は、水蒸気などの酸化性ガスとの反応性が良好であるため、残留炭素量が少ない高品質な金属含有薄膜を生産性よく製造することができる。
上記金属含有薄膜形成後、未反応の反応性ガス及び副生ガスを成膜チャンバー内から排気する。この際、反応性ガス及び副生ガスが成膜チャンバー内から完全に排気されるのが理想的であるが、必ずしも完全に排気する必要はない。排気方法及び減圧する場合の減圧度は、上述した前駆体薄膜形成工程後の排気工程と同様である。
100mlの三つ口フラスコに、室温にてトリメチルインジウム1.07g(6.7mmol)及び脱水テトラヒドロフラン(THF)15mlを加え、N-エチル-N’-tert-ブチル-プロピオアミジン1.05g(6.7mmol)を氷冷下で滴下し、室温で19時間撹拌を行った。オイルバス70℃、微減圧にてTHFを留去した。その後、フラスコ内に残った淡黄色透明液体を減圧下(40Pa)で蒸留し、留出分として無色透明液体0.92g(3.1mmol、収率46%)を得た。
得られた無色透明液体は、1H-NMR及びICP-AESによる分析の結果、目的化合物である化合物No.9であることを確認した。得られた無色透明液体の分析結果を以下に示す。
0.114ppm(6H,singlet)、0.888-0.956ppm(6H,multiplet)、1.108ppm(9H,singlet)、2.009-2.065(2H,quartet)、2.958-3.012(2H,quartet)
In:38.31質量%(理論値:38.25質量%)、C:44.00質量%(理論値:44.02質量%)、H:8.41質量%(理論値:8.40質量%)、N:9.28質量%(理論値:9.33質量%)
100mlの三つ口フラスコに、室温にてトリメチルインジウム0.98g(6.1mmol)及び脱水THF15mlを加え、ジピバロイルメタン1.12g(6.1mmol)を氷冷下で滴下し、室温で20時間撹拌を行った。オイルバス70℃、微減圧にてTHFを留去した。その後、フラスコ内に残った淡黄色透明液体を減圧下(50Pa)で蒸留し、留出分として無色透明液体1.32g(4.0mmol、収率66%)を得た。
得られた無色透明液体は、1H-NMR及びICP-AESによる分析の結果、目的化合物である化合物No.46であることを確認した。得られた無色透明液体の分析結果を以下に示す。
0.015ppm(6H,singlet)、1.145ppm(18H,singlet)、5.743ppm(1H,singlet)
In:35.02質量%(理論値:34.99質量%)、C:47.55質量%(理論値:47.58質量%)、H:7.72質量%(理論値:7.68質量%)、O:9.71質量%(理論値:9.75質量%)
100mlの三つ口フラスコに、室温にてトリメチルガリウム0.81g(7.1mmol)及び脱水THF15mlを加え、ジピバロイルメタン1.31g(7.1mmol)を氷冷下で滴下し、室温で20時間撹拌を行った。オイルバス70℃、微減圧にてTHFを留去した。その後、フラスコ内に残った淡黄色透明液体を減圧下(50Pa)で蒸留し、留出分として無色透明液体1.25g(4.4mmol、収率62%)を得た。得られた無色透明液体は、1H-NMR及びICP-AESによる分析の結果、目的化合物である化合物No.66であることを確認した。得られた無色透明液体の分析結果を以下に示す。
0.052ppm(6H,singlet)、1.061ppm(18H,singlet)、5.735ppm(1H,singlet)
Ga:24.64質量%(理論値:24.63質量%)、C:55.11質量%(理論値:55.16質量%)、H:8.91質量%(理論値:8.90質量%)、O:11.34質量%(理論値:11.31質量%)
目視によって、常圧25℃における化合物の状態を観察し、固体化合物については微小融点測定装置を用いて融点を測定した。結果を表1及び表2に示す。
試験化合物を密閉容器に封入し、昇温速度10℃/分の条件で500℃まで示差走査熱量(DSC)を測定し、試験化合物の熱分解が開始する温度を評価した。熱分解開始温度が低いほど、試験化合物の熱安定性が乏しいことを示す。結果を表1及び表2に示す。
化合物No.9及び化合物No.46の融点評価と同一条件で融点を測定した。結果を表3に示す。
TG-DTAを用いて、10Torr、アルゴン流量:50mL/分、昇温速度10℃/分、走査温度範囲を30℃~600℃として測定し、試験化合物の重量が50質量%減少した時の温度(℃)を「減圧TG-DTA50質量%減少時の温度(℃)」として評価した。減圧TG-DTA50質量%減少時の温度(℃)が低いほど、低温で蒸気が得られることを示す。結果を表3に示す。
TG-DTAを用いて、760Torr、アルゴン流量:100mL/分、昇温速度10℃/分、走査温度範囲を30℃~400℃として測定し、試験化合物の重量が50質量%減少した時の温度(℃)を「常圧TG-DTA50質量%減少時の温度(℃)」として評価した。常圧TG-DTA50質量%減少時の温度(℃)が低いほど、低温で蒸気が得られることを示す。結果を表3に示す。
化合物No.9及び化合物No.46の熱分解開始温度測定と同一条件で熱分解開始温度を測定した。結果を表3に示す。
化合物No.66を、原子層堆積法用薄膜形成用原料として用い、図1に示すALD装置を用い、下記の条件で、基体であるシリコンウェハの表面上に薄膜を製造した。X線電子分光法を用いて薄膜の組成を分析したところ、薄膜は、酸化ガリウムを含有する薄膜であり、残留炭素量は、検出限界である0.1atom%よりも少ないことを確認した。また、走査型電子顕微鏡法を用いて薄膜の膜厚を測定したところ、シリコンウェハ表面上に形成された薄膜は、10nmの平滑な膜であり、1サイクル当たりに得られる膜厚は、約0.02nmであった。
製造方法:ALD法
反応温度(基体温度):300℃
反応性ガス:水蒸気
下記(1)~(4)からなる一連の工程を1サイクルとして、500サイクル繰り返した。
(1)原料容器温度40℃、原料容器内圧力100Paの条件で原子層堆積法用薄膜形成用原料を気化して得られる原料ガスを成膜チャンバー内に導入し、系圧100Paで10秒間、基体の表面に原料ガスを吸着させて前駆体薄膜を形成する。
(2)15秒間のアルゴンパージにより、吸着しなかった原料ガスを系内から排気する。
(3)反応性ガスを成膜チャンバー内に導入し、系圧力100Paで0.2秒間、前駆体薄膜と反応性ガスとを反応させる。
(4)60秒間のアルゴンパージにより、未反応の反応性ガス及び副生ガスを系内から排気する。
化合物No.9を、原子層堆積法用薄膜形成用原料として用い、図1に示すALD装置を用い、下記の条件で、基体であるシリコンウェハの表面上に薄膜を製造した。X線電子分光法を用いて薄膜の組成を分析したところ、薄膜は、酸化インジウムを含有する薄膜であり、残留炭素量は、検出限界である0.1atom%よりも少ないことを確認した。また、走査型電子顕微鏡法を用いて薄膜の膜厚を測定したところ、シリコンウェハ表面上に形成された薄膜は、20nmの平滑な膜であり、1サイクル当たりに得られる膜厚は、約0.04nmであった。
製造方法:ALD法
反応温度(基体温度):250℃
反応性ガス:水蒸気
下記(1)~(4)からなる一連の工程を1サイクルとして、500サイクル繰り返した。
(1)原料容器温度50℃、原料容器内圧力100Paの条件で原子層堆積法用薄膜形成用原料を気化して得られる原料ガスを成膜チャンバー内に導入し、系圧100Paで10秒間、基体の表面に原料ガスを吸着させて前駆体薄膜を形成する。
(2)15秒間のアルゴンパージにより、吸着しなかった原料ガスを系内から排気する。
(3)反応性ガスを成膜チャンバー内に導入し、系圧力100Paで0.2秒間、前駆体薄膜と反応性ガスとを反応させる。
(4)60秒間のアルゴンパージにより、未反応の反応性ガス及び副生ガスを系内から排気する。
化合物No.46を、原子層堆積法用薄膜形成用原料として用い、図1に示すALD装置を用い、下記の条件で、基体であるシリコンウェハの表面上に薄膜を製造した。X線電子分光法を用いて薄膜の組成を分析したところ、薄膜は、酸化インジウムを含有する薄膜であり、残留炭素量は、検出限界である0.1atom%よりも少ないことを確認した。また、走査型電子顕微鏡法を用いて薄膜の膜厚を測定したところ、シリコンウェハ表面上に形成された薄膜は、16nmの平滑な膜であり、1サイクル当たりに得られる膜厚は、約0.03nmであった。
製造方法:ALD法
反応温度(基体温度):300℃
反応性ガス:水蒸気
下記(1)~(4)からなる一連の工程を1サイクルとして、500サイクル繰り返した。
(1)原料容器温度50℃、原料容器内圧力100Paの条件で原子層堆積法用薄膜形成用原料を気化して得られる原料ガスを成膜チャンバー内に導入し、系圧100Paで10秒間、基体の表面に原料ガスを吸着させて前駆体薄膜を形成する。
(2)15秒間のアルゴンパージにより、吸着しなかった原料ガスを系内から排気する。
(3)反応性ガスを成膜チャンバー内に導入し、系圧力100Paで0.2秒間、前駆体薄膜と反応性ガスとを反応させる。
(4)60秒間のアルゴンパージにより、未反応の反応性ガス及び副生ガスを系内から排気する。
比較化合物4(トリ(ジメチルアミノ)ガリウム)を、原子層堆積法薄膜形成用原料として用い、原料容器温度を80℃に変更したこと以外は実施例4と同一条件で、基体であるシリコンウェハの表面上に薄膜を製造した。X線電子分光法を用いて薄膜の組成を分析したところ、薄膜は、酸化ガリウムを含有する薄膜であったが、残留炭素が検出された。また、走査型電子顕微鏡法を用いて薄膜の状態を観察したところ、シリコンウェハ表面上に形成された薄膜は平滑ではなく、膜厚を測定できなかった。
Claims (6)
- 下記一般式(1)で表される化合物を含有する原子層堆積法用薄膜形成用原料。
- R1及びR2がメチル基である請求項1に記載の原子層堆積法用薄膜形成用原料。
- 基体の表面にインジウム原子又はガリウム原子を含有する薄膜を製造する方法であって、
請求項1又は2に記載の原子層堆積法用薄膜形成用原料を気化して得られる原料ガス中の前記化合物を前記基体の表面に吸着させて前駆体薄膜を形成する工程と、
前記前駆体薄膜を反応性ガスと反応させて前記基体の表面にインジウム原子又はガリウム原子を含有する薄膜を形成する工程と
を含む薄膜の製造方法。 - 前記反応性ガスが、酸化性ガスであり、且つ前記薄膜が、酸化インジウム薄膜又は酸化ガリウム薄膜である請求項3に記載の薄膜の製造方法。
- 前記酸化性ガスが、酸素、オゾン又は水蒸気を含有するガスである請求項4に記載の薄膜の製造方法。
- 100℃~400℃の範囲で前記前駆体薄膜を前記反応性ガスと反応させる請求項4又は請求項5に記載の薄膜の製造方法。
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IL296896A IL296896A (en) | 2020-04-01 | 2021-03-18 | A raw material that forms a thin layer used in the atomic layer deposition method and a method for producing a thin layer |
CN202180025691.9A CN115362282B (zh) | 2020-04-01 | 2021-03-18 | 原子层沉积法用薄膜形成用原料及薄膜的制造方法 |
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EP21781717.0A EP4130335A4 (en) | 2020-04-01 | 2021-03-18 | THIN FILM FORMING MATERIAL FOR USE IN ATOMIC LAYER DEPOSITION AND METHOD OF PRODUCING A THIN FILM |
US17/915,270 US20230151220A1 (en) | 2020-04-01 | 2021-03-18 | Thin-film forming raw material used in atomic layer deposition method and method of producing thin-film |
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CN115362282A (zh) | 2022-11-18 |
EP4130335A4 (en) | 2024-07-03 |
IL296896A (en) | 2022-12-01 |
US20230151220A1 (en) | 2023-05-18 |
CN118223007A (zh) | 2024-06-21 |
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