WO2023132174A1 - 成膜装置および成膜方法 - Google Patents
成膜装置および成膜方法 Download PDFInfo
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- WO2023132174A1 WO2023132174A1 PCT/JP2022/045003 JP2022045003W WO2023132174A1 WO 2023132174 A1 WO2023132174 A1 WO 2023132174A1 JP 2022045003 W JP2022045003 W JP 2022045003W WO 2023132174 A1 WO2023132174 A1 WO 2023132174A1
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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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/448—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for generating reactive gas streams, e.g. by evaporation or sublimation of precursor materials
- C23C16/4486—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for generating reactive gas streams, e.g. by evaporation or sublimation of precursor materials by producing an aerosol and subsequent evaporation of the droplets or particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
- B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
- B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
- B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
- B05B17/0615—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers spray being produced at the free surface of the liquid or other fluent material in a container and subjected to the vibrations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
- B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
- B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
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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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/40—Oxides
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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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/448—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for generating reactive gas streams, e.g. by evaporation or sublimation of precursor materials
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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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/448—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for generating reactive gas streams, e.g. by evaporation or sublimation of precursor materials
- C23C16/4481—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for generating reactive gas streams, e.g. by evaporation or sublimation of precursor materials by evaporation using carrier gas in contact with the source material
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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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/458—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber
- C23C16/4582—Rigid and flat substrates, e.g. plates or discs
- C23C16/4583—Rigid and flat substrates, e.g. plates or discs the substrate being supported substantially horizontally
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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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/52—Controlling or regulating the coating process
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/24—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials using chemical vapour deposition [CVD]
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/26—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials using liquid deposition
- H10P14/265—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials using liquid deposition using solutions
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/29—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by the substrates
- H10P14/2901—Materials
- H10P14/2921—Materials being crystalline insulating materials
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/34—Deposited materials, e.g. layers
- H10P14/3402—Deposited materials, e.g. layers characterised by the chemical composition
- H10P14/3434—Deposited materials, e.g. layers characterised by the chemical composition being oxide semiconductor materials
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/60—Formation of materials, e.g. in the shape of layers or pillars of insulating materials
- H10P14/63—Formation of materials, e.g. in the shape of layers or pillars of insulating materials characterised by the formation processes
- H10P14/6326—Deposition processes
- H10P14/6328—Deposition from the gas or vapour phase
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- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/60—Formation of materials, e.g. in the shape of layers or pillars of insulating materials
- H10P14/66—Formation of materials, e.g. in the shape of layers or pillars of insulating materials characterised by the type of materials
- H10P14/668—Formation of materials, e.g. in the shape of layers or pillars of insulating materials characterised by the type of materials the materials being characterised by the deposition precursor materials
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- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/60—Formation of materials, e.g. in the shape of layers or pillars of insulating materials
- H10P14/69—Inorganic materials
- H10P14/692—Inorganic materials composed of oxides, glassy oxides or oxide-based glasses
- H10P14/6938—Inorganic materials composed of oxides, glassy oxides or oxide-based glasses the material containing at least one metal element, e.g. metal oxides, metal oxynitrides or metal oxycarbides
- H10P14/6939—Inorganic materials composed of oxides, glassy oxides or oxide-based glasses the material containing at least one metal element, e.g. metal oxides, metal oxynitrides or metal oxycarbides characterised by the metal
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- H10P14/60—Formation of materials, e.g. in the shape of layers or pillars of insulating materials
- H10P14/69—Inorganic materials
- H10P14/692—Inorganic materials composed of oxides, glassy oxides or oxide-based glasses
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- H10P14/6939—Inorganic materials composed of oxides, glassy oxides or oxide-based glasses the material containing at least one metal element, e.g. metal oxides, metal oxynitrides or metal oxycarbides characterised by the metal
- H10P14/69391—Inorganic materials composed of oxides, glassy oxides or oxide-based glasses the material containing at least one metal element, e.g. metal oxides, metal oxynitrides or metal oxycarbides characterised by the metal the material containing aluminium, e.g. Al2O3
Definitions
- the present invention relates to a film forming apparatus and a film forming method for forming a film by supplying an atomized liquid raw material to a substrate.
- Mist Chemical Vapor Deposition is known as a method capable of forming various thin films on a substrate at a low temperature and in an atmospheric pressure atmosphere.
- the raw material mist which is a feature of the mist CVD method, is generally generated by ultrasonic atomization (also called misting). This is because the raw material mist obtained by ultrasonic atomization has fine droplets and is suitable for film formation, and it is easy to obtain a relatively good particle size distribution.
- Patent Document 1 a raw material solution in which a gallium acetylacetonate complex is dissolved in a mixed solution of hydrochloric acid and water is turned into a mist by an ultrasonic oscillator, and sapphire is placed in a narrow space (fine channel) provided in a reactor.
- a method of supplying a substrate and forming an ⁇ -Ga 2 O 3 film on the substrate heated to 350° C. to 500° C. is described.
- Patent Literature 2 describes an atomization device in which temperature is adjusted by circulating an ultrasonic transmission liquid that transmits ultrasonic waves to a raw material solution, and a mist CVD apparatus equipped with the atomization device.
- the present invention provides a film forming apparatus, atomization means for atomizing the raw material solution to form a raw material mist; carrier gas supply means for conveying the raw material mist; mist supply means for supplying a mixture of the raw material mist and the carrier gas to the substrate surface; a stage on which the substrate is placed; measuring means for directly or indirectly measuring the supply amount of the raw material mist and outputting a signal corresponding to the measured value obtained by the measurement; and control means for receiving the signal and adjusting the supply amount of the raw material mist based on the signal.
- the supply amount of the raw material mist can be kept constant at all times, so that the film forming apparatus can stably produce a film of uniform quality.
- control means controls the atomization means to adjust the supply amount of the raw material mist.
- the supply amount of the raw material mist can be precisely controlled, so that the raw material supply can be stabilized more easily, and the film forming apparatus can produce a more homogeneous film. can do.
- control means controls the carrier gas supply means to adjust the supply amount of the raw material mist.
- the supply amount of the raw material solution mist can be controlled more precisely, so that the raw material supply can be stabilized more easily, and the film forming apparatus can produce a more homogeneous film.
- a film forming method for forming a film on a substrate by supplying a raw material mist generated by atomizing a raw material solution to the surface of the substrate comprising: placing the substrate on a stage; atomizing the raw material solution to generate the raw material mist; mixing the raw material mist and a carrier gas to form a mixture; and supplying the gas mixture to the substrate to form a film on the substrate;
- the supply amount of the raw material mist is directly or indirectly measured, and the measured value obtained by the measurement and the supply amount of the raw material are combined.
- a film forming method is provided in which a deviation from a reference value is calculated, and either or both of the atomization amount of the raw material solution and the carrier gas supply rate are adjusted so as to eliminate the deviation.
- the supply amount of raw material mist can always be kept constant, so a homogeneous film can be stably produced.
- the object to be measured is preferably the raw material mist, a precipitate from the raw material mist, a by-product derived from the raw material mist, or a mixture thereof.
- the supply amount of the raw material mist can be quantified in a short time, so the supply amount of the raw material mist can be easily controlled, and a more homogeneous film can be manufactured.
- the present invention it is possible to obtain a film forming apparatus that can always stably produce a homogeneous film. Moreover, according to the present invention, it becomes possible to stably produce a homogeneous film. In addition, since the number of defects can be reduced (yield is improved), the film formation apparatus and the film formation method have high productivity.
- the present invention is a film forming apparatus, atomization means for atomizing the raw material solution to form a raw material mist; carrier gas supply means for conveying the raw material mist; mist supply means for supplying a mixture of the raw material mist and the carrier gas to the substrate surface; a stage on which the substrate is placed; measuring means for directly or indirectly measuring the supply amount of the raw material mist and outputting a signal corresponding to the measured value obtained by the measurement; and control means for receiving the signal and adjusting the supply amount of the raw material mist based on the signal.
- the present invention also provides a film forming method for forming a film on a substrate by supplying a raw material mist generated by atomizing a raw material solution to the surface of the substrate, comprising: placing the substrate on a stage; atomizing the raw material solution to generate the raw material mist; mixing the raw material mist and a carrier gas to form a mixture; and supplying the gas mixture to the substrate to form a film on the substrate;
- the supply amount of the raw material mist is directly or indirectly measured, and the measured value obtained by the measurement and the supply amount of the raw material are combined.
- a deviation from a reference value is calculated, and either or both of the atomization amount of the raw material solution and the supply amount of the carrier gas are adjusted so as to eliminate the deviation.
- the film forming apparatus of the present invention directly or indirectly measures the atomization means, the carrier gas supply means, the mist supply means, the stage on which the substrate is placed, and the supply amount of the raw material mist. and a control means for receiving the signal and adjusting the supply amount of the raw material mist based on the signal. Details will be described below.
- FIG. 1 is a diagram for explaining one form of the configuration of a film forming apparatus suitably used in the present invention.
- a film forming apparatus 100 preferably used in the present invention includes atomizing means 123 in contact with a raw material container 120 for atomizing a raw material solution 121 to generate a raw material mist 122, and a film forming chamber 131 for forming a film on the substrate.
- the film forming apparatus 100 further includes carrier gas supply means 111 , and the carrier gas supply means 111 , source container 120 and film forming chamber 131 are connected by pipes 113 and 124 .
- Carrier gas 151 and raw material mist 122 are mixed in raw material container 120 to form mixture 152 , which is supplied to deposition chamber 131 by mist supply means 160 .
- the pipe 124 is provided with a measuring means 171 for measuring the passing amount of the raw material mist 122 in the air-fuel mixture 152.
- the atomization means 123 and carrier gas supply means 111 are connected by wirings 172 , 182 , 183 , 192 and 193 .
- the raw material solution 121 is not particularly limited as long as it can be misted, and in addition to organic compounds, metals in the form of complexes or salts dissolved or dispersed in water or organic solvents can be used.
- an acid such as hydrochloric acid, hydrobromic acid, or hydroiodic acid, or an alkali such as ammonia may be added to the solvent to adjust the pH of the solvent.
- the atomization means 123 for the raw material solution 121 is not particularly limited as long as it can atomize or dropletize the raw material solution 121, and may be any known means. is preferred.
- the mist or droplets obtained using ultrasonic waves have an initial velocity of zero and are preferable because they float in the air. Since it is a possible mist, there is no damage due to collision energy, so it is very suitable.
- the droplet size is not particularly limited, and may be droplets of several millimeters, preferably 50 ⁇ m or less, more preferably 0.1 to 10 ⁇ m.
- the atomization means 123 can be composed of a plurality of ultrasonic transducers 123a and a plurality of drive circuits 123b for driving each ultrasonic transducer 123a.
- the number of sets of the ultrasonic transducer 123a and the driving circuit 123b is not limited to the form shown in FIG. 2, and may be three or less or five or more.
- the frequency of the ultrasonic waves oscillated from the ultrasonic oscillator 123a is not limited as long as it generates mist having a desired particle size and particle size distribution. . Further, in the case of the atomization means having a plurality of ultrasonic transducers 123a, the transmission frequencies of the ultrasonic transducers 123a may be different, for example, within the above frequency range, or may be the same, depending on the purpose. good.
- the raw material solution 121 is atomized into micron-sized droplets (raw material mist) suitable for film formation.
- a plurality of raw material containers 120 may be provided depending on the material to be deposited. Further, in this case, the gas mixture 152 supplied from the plurality of raw material containers 120 to the film forming chamber 131 may be independently supplied to the film forming chamber 131, or may be supplied to the pipe 124 or a container for mixing (unnecessary). (illustration) may be separately provided and mixed. In this case, control means 191a, which will be described later, is preferably installed for each raw material container.
- the raw material container 120 may further include temperature control means (not shown) for directly or indirectly controlling the temperature of the raw material solution 121 .
- the temperature of the raw material solution 121 is not particularly limited as long as it can be atomized. By doing so, the temperature drop on the film formation surface of the substrate 130 is alleviated, and better film formation becomes possible. If the temperature is 90° C. or less, vaporization of the raw material mist 122 is effectively suppressed, the yield in film formation can be stably maintained, and defects on the film surface can be reduced more stably.
- the raw material container 120 may further comprise means for replenishing the raw material solution 121 (not shown).
- the means for replenishing the raw material solution 121 may further include a sensor that directly or indirectly detects the weight or liquid level of the raw material solution 121 .
- a known measuring method can be widely applied to the sensor, and a liquid level sensor, a load cell, or a pressure sensor installed at the bottom of the raw material container 120 so as to be in contact with the raw material solution 121 can be preferably used. These sensors can also be used as measurement means, which will be described in detail later.
- the amount of the raw material solution supplied to the film forming chamber 131 may be calculated as the time derivative of the measured value by the sensor or the like.
- Carrier gas supply means 111 supplies carrier gas 151 .
- the type of the carrier gas 151 is not particularly limited, and in addition to inert gases such as nitrogen and argon, reducing gases such as air, oxygen, ozone, hydrogen and forming gas can be used. can also be used.
- the carrier gas supply means 111 may be an air compressor, various gas cylinders, a nitrogen gas separator, or the like.
- the carrier gas supply means 111 may include a known fluid flow rate controller, such as a flow meter or mass flow controller, for adjusting the supply flow rate of the carrier gas.
- the supply flow rate of the carrier gas may be appropriately set according to the size of the substrate and the size of the film forming chamber, and can be set to, for example, about 0.01 to 100 L/min.
- a measuring means 171 is installed in the pipe 124 and continuously measures the supply amount of the raw material mist contained in the air-fuel mixture 152 .
- the supply amount of the raw material mist can be measured by the light scattering method, the condensation nucleus counting method, the aerosol electrometer method, the piezo balance method, or by evaporating the mist or the liquid component of the mist collected by a mist trap or filter. Any known measurement method such as a method of weighing precipitates can be applied.
- the mist itself flowing in the pipe 124 may be measured, or a branch pipe may be installed in the pipe 124 to sample a small amount of mist, and the sample may be measured and calculated.
- the measuring means 171 is preferably installed in all of these pipes.
- the object to be measured by the measuring means 171 is not limited to the mist passing through the pipe 124, but also the raw material mist 122, by-products such as mist and powder discharged from the film forming chamber 131 or from the exhaust pipe 133, and mixtures thereof.
- the liquid volume of the raw material solution 121 can be measured. It is preferable because there are many When the liquid volume of the raw material solution is to be measured, a method of measuring the water level, volume or weight of the raw material solution 121 can be used. In this case, known sensors that directly or indirectly detect the weight or liquid level can be widely applied. A sensor can be preferably used. Further, in this case, the amount of the raw material solution supplied to the film forming chamber 131 can be calculated as the time derivative of the measured value by the sensor or the like.
- the installation location and installation method of the measuring means 171 can be made suitable for each of the above-described various measurement objects and measurement methods.
- the measuring means 171 transmits signals corresponding to the measured values to the control means 191a and 191b.
- a widely known method can be applied to the signal transmission method at this time, and a wired or wireless communication method using electromagnetic waves, electricity, magnetism, sound, or a combination thereof is preferably used.
- the measuring means 171 may further include calculating means 181a and 181b for comparing and calculating the measured value of the object to be measured and the reference value set according to the manufacturing conditions.
- the computing means of the measuring means 171 may calculate the deviation between the measured value and the reference value, and send a signal corresponding to the deviation to the control means 191a and 191b so as to eliminate the deviation.
- control means controls the atomization means and adjusts the supply amount of the raw material mist.
- the control means controls the atomization means and adjusts the supply amount of the raw material mist.
- a measuring means that directly or indirectly measures the supply amount of the raw material mist and outputs a signal corresponding to the measured value obtained by the measurement.
- the following control means is preferable. .
- the drive circuit 123b is connected to the control means 191a by a wiring 192.
- the control means 191a preferably includes a power supply, a switch, and an output adjuster for each drive circuit 123b, and preferably has a configuration capable of individually controlling a plurality of ultrasonic transducers 123a. This makes it possible to more precisely control the atomization amount of the raw material solution 121 .
- the computing means 181a first compares the signal received from the measuring means 171 with a reference value to calculate the deviation, and then sends a control signal corresponding to the deviation to the control means 191a.
- the control means 191a receives the control signal and individually opens/closes the drive circuit 123b or individually increases/decreases the applied power so as to eliminate the deviation, thereby adjusting the supply amount of the raw material mist.
- the calculation means 181a may be configured integrally with the measurement means 171 or the control means 191a.
- control means controls the carrier gas supply means to adjust the supply amount of the raw material mist.
- the carrier gas supply means 111 is connected to the control means 191b by a wiring 193, and the flow rate of the carrier gas 151 can be controlled.
- the control means 191b is configured to individually adjust the carrier gas supply flow rate of each system. You can also
- the computing means 181b first compares the signal received from the measuring means 171 with a reference value to calculate the deviation, and then sends a control signal corresponding to the deviation to the control means 191b.
- the control means 191b receives the control signal and electromagnetically or mechanically adjusts the opening degree of the fluid flow rate regulator as described above or individually opens and closes to supply raw material mist so as to eliminate the deviation. Adjust quantity.
- the calculation means 181b may be configured integrally with the measurement means 171 or the control means 191b.
- FIG. 1 shows an example having two control means 191a and 191b
- the film forming apparatus of the present invention is not limited to this, and an apparatus having only one of the control means 191a and 191b may be used. can.
- the film formation chamber 131 is provided with a supply pipe 134 that is connected to the pipe 124 and that supplies the air-fuel mixture 152 into the film formation chamber 131 .
- a supply pipe 134 for example, quartz, glass, or a resin tube or the like can be used.
- the exhaust gas exhaust pipe 133 may be provided at a position that does not affect mist supply from the supply pipe 134 .
- the exhaust pipe 133 may be connected to an abatement means (not shown).
- the abatement means is not particularly limited as long as it can remove harmful substances contained in the exhaust gas.
- known techniques such as mist traps, wet scrubbers, combustion abatement devices, and bag filters can be widely applied. can.
- the structure and material of the film forming chamber 131 are not particularly limited.
- metal such as aluminum and stainless steel, soda glass, and borosilicate glass may be used.
- stage 132 A stage 132 is installed at the bottom of the film forming chamber 131 , and the substrate 130 is placed on the stage 132 .
- the stage 132 may have means for fixing and holding the base 130 .
- a known holding means such as a vacuum chuck, a mechanical chuck, or an electrostatic chuck can be preferably used.
- the stage 132 may have means for heating the substrate 130 .
- known heating means can be applied, and resistance heating, electromagnetic induction heating, lamp heating, or the like is preferably used.
- the heating of the substrate 130 is appropriately adjusted depending on the raw material mist 122 to be used and film forming conditions, but generally can be in the range of 120.degree. C. to 800.degree.
- the material of the stage 132 may be appropriately selected according to the process conditions such as the acidity of the raw material used for film formation and the heating temperature.
- Aluminum oxide, aluminum nitride, and quartz are preferable, and silicon carbide, aluminum oxide, aluminum nitride, and quartz are more preferable when higher corrosion resistance to the raw material solution is desired.
- Nickel alloy refers to an alloy containing 50% or more of nickel.
- the stage 132 may further include a mechanism for transporting or rotating the substrate.
- the mist supply means 160 is not particularly limited as long as it supplies the air-fuel mixture 152 to the surface of the substrate 130 .
- the pipe 124 and the supply pipe 134 can be combined to form the mist supply means 160 .
- the pipes 113 and 124 have sufficient stability with respect to the raw material solution 121 and the temperature inside and outside the film forming chamber 131.
- the pipe 124 is used to measure the amount of supplied mist, the above-mentioned It is not particularly limited as long as it is suitable for measurement, and in addition to quartz, general resin pipes such as polyethylene, polypropylene, vinyl chloride, acrylic resin, silicone resin, urethane resin, fluororesin, etc. can be widely used. .
- a pipe from the carrier gas supply means 111 that does not pass through the raw material container 120 is separately connected to the pipe 124, and a diluent gas is further added to the mixture 152 so that the raw material mist 122 and the carrier gas 151 are mixed. It is also possible to adjust the proportions.
- the flow rate of the diluent gas may be appropriately set, and can be, for example, 0.1 to 20 times the carrier gas.
- the diluent gas may be supplied to the downstream side of the raw material container 120, for example.
- the same diluent gas as the carrier gas 151 may be used, or a different one may be used.
- a film forming apparatus includes measuring means for directly or indirectly measuring the supply amount of raw material mist and outputting a signal corresponding to the measured value obtained by the measurement; By providing control means for adjusting the supply amount of the raw material mist based on the above, it is possible to form a film with high uniformity in quality such as film thickness and composition.
- the film forming apparatus can obtain not only uniformity between samples but also high uniformity within the film.
- a film forming method for forming a film on a substrate by supplying a raw material mist generated by atomizing a raw material solution to the surface of the substrate, comprising: placing the substrate on a stage; atomizing the raw material solution to generate the raw material mist; mixing the raw material mist and a carrier gas to form a mixture; and supplying the gas mixture to the substrate to form a film on the substrate;
- the supply amount of the raw material mist is directly or indirectly measured, and the measured value obtained by the measurement and the supply amount of the raw material are combined.
- a film forming method in which a deviation from a reference value is calculated, and either or both of the atomization amount of the raw material solution and the carrier gas supply rate are adjusted so as to eliminate the deviation. That is, in the film forming method using the film forming apparatus of the present invention, the raw material solution is made into mist, and the raw material solution made into mist (raw material mist) is supplied to the substrate placed on the stage of the film forming apparatus. In parallel with forming a film on the substrate, the supply amount of the raw material mist is measured (monitored), and the supply amount is controlled so as to maintain the reference value of the supply amount.
- the substrate 130 is not particularly limited as long as it can support the film to be formed, and may be plate-shaped such as a flat plate or disc, rod-shaped, columnar, prismatic, cylindrical, ring-shaped, or the like.
- the material of the substrate 130 is also not particularly limited, and may be a known material, an organic compound, or an inorganic compound.
- vinyl chloride polyethylene, polyethylene terephthalate, polysulfone, polyethersulfone, polyphenylene sulfide, polyetheretherketone, polyimide, polyetherimide, fluororesin, metals such as iron, aluminum, stainless steel, and gold, quartz, and glass , calcium carbonate, silicon, aluminum oxide, gallium oxide, zinc oxide, gallium nitride, silicon carbide, lithium tantalate, lithium niobate and the like are preferably used.
- the substrate should preferably be a crystal, more preferably a single crystal.
- a substrate having a film-forming surface area (main surface area) of preferably 15 cm 2 or more, more preferably 20 cm 2 or more, and a thickness of preferably 50 to 5000 ⁇ m, more preferably 100 to 2000 ⁇ m can be used. can also be preferably used. When the thickness is 50 ⁇ m or more, it is easy to support the crystalline semiconductor film. Further, when the main surface area is 15 cm 2 or more, a homogeneous film can be formed with higher productivity.
- the method of mounting the substrate on the stage is not particularly limited, and a known method can be used.
- the method of atomizing the raw material solution is not particularly limited, and a known method can be used, preferably using ultrasonic waves.
- organic solvents or water for the raw material solution, in addition to organic compounds, metals in the form of complexes or salts dissolved or dispersed in organic solvents or water can be used.
- an acid such as hydrochloric acid, hydrobromic acid, hydroiodic acid, or an alkali such as ammonia is added to a solvent such as the organic solvent or water as necessary to adjust the pH of the solvent. good too.
- the content of the solute in the raw material solution is not particularly limited, and can be set appropriately according to the purpose. It is preferably 0.001 mol/L or more and 2 mol/L or less, and more preferably 0.01 mol/L or more and 0.7 mol/L or less.
- the method of mixing the atomized raw material solution and the carrier gas to form the air-fuel mixture is not particularly limited. , a known method can be used.
- the type of carrier gas is not particularly limited, and in addition to inert gases such as nitrogen and argon, reducing gases such as air, oxygen, ozone, hydrogen and forming gas can also be used, and a plurality of these gases can be mixed and used. can also
- the flow rate of the carrier gas may be appropriately set depending on the size of the substrate and the size of the film forming chamber, and can be set to, for example, about 0.01 to 100 L/min.
- the method of supplying the mixture to the substrate and the method of forming the film are not particularly limited, and known methods can be used.
- the method for measuring the supply amount of the raw material mist is not particularly limited.
- any known measuring method can be applied, such as a method of weighing a precipitate obtained by evaporating a mist or a liquid component of the mist collected by a mist trap or a filter.
- the method for calculating the deviation is not particularly limited, and a known method can be used.
- the method of adjusting either or both of the atomization amount and the carrier gas supply amount is particularly There is no limitation, and known methods such as on/off control, PID control, and cascade control can be used.
- the object to be measured may be raw material mist, precipitates from raw material mist, by-products derived from raw material mist, or a mixture thereof.
- the supply amount of the raw material mist is measured directly or indirectly, and the amount obtained by the measurement is measured. Calculate the deviation from the reference value of the measured value and the raw material supply amount, and adjust either or both of the raw material solution atomization amount and the carrier gas supply amount so as to eliminate the deviation. It is possible to form a film with high uniformity. It is a film forming method that can obtain not only uniformity between samples but also high uniformity within a film.
- Such a film forming method can be performed using the above-described film forming apparatus according to the present invention.
- Example 1 [Device]
- a nitrogen cylinder was used for the carrier gas supply unit 111 , a mass flow controller was connected to the nitrogen cylinder, and the mass flow controller and the raw material container 120 made of borosilicate glass were connected by a pipe 113 made of PFA.
- an ultrasonic generator having four 2.4 MHz ultrasonic transducers was prepared.
- a quartz deposition chamber 131 was prepared, and a quartz supply pipe 134 and the raw material container 120 were connected by a quartz pipe 124 .
- a hot plate made of silicon carbide with a built-in resistance heating type heater was used for the stage 132 .
- a wide range particle spectrometer (1000xp manufactured by MSP) was used as the measuring means 171 .
- the control means 191a used a control unit also serving as a power source for driving the ultrasonic generator
- the control means 191b used an arithmetic circuit for mass flow controller control, which were connected to the ultrasonic generator and the mass flow controller, respectively.
- a c-plane sapphire substrate having a diameter of 4 inches (10 cm) and a thickness of 0.7 mm was placed on a stage and fixed by adsorption with a pump.
- a solution having a gallium concentration of 0.2 mol/L was prepared by dissolving gallium acetylacetonate in an acid solution in which hydrochloric acid and pure water were mixed, and used as a raw material solution 121 .
- the raw material container 120 was filled with the raw material solution 121, and the raw material solution 121 was atomized by applying ultrasonic vibration of 2.4 MHz.
- Nitrogen gas was introduced into the raw material container 120 from a nitrogen bomb, and the generated mixture was supplied to the film forming chamber 131 to form a film.
- the nitrogen flow rate was set so that the flow rate of the raw material mist in the air-fuel mixture was 1 g/min.
- the flow rate is a value calculated from the number of mists per unit time measured by a measuring device and the density of the raw material solution separately measured.
- film formation was carried out for 60 minutes while controlling the material supply amount only by adjusting the outputs of the four ultrasonic vibrators. A similar procedure was repeated to prepare a total of 20 samples.
- Example 2 In the apparatus used in Example 1, while the four ultrasonic transducers were continuously driven at a constant output, the raw material supply amount was controlled only by adjusting the carrier gas flow rate. did Measurement by XRD (Rigaku SmartLab) confirmed that the films formed in all the samples were all ⁇ -phase Ga 2 O 3 . After that, the film thickness was evaluated in the same manner as in Example 1.
- Example 1 A film was formed in the same manner as in Example 1, except that the raw material supply amount was not controlled. Measurement by XRD (Rigaku SmartLab) confirmed that the films formed in all the samples were all ⁇ -phase Ga 2 O 3 . After that, the film thickness was evaluated in the same manner as in Example 1.
- Table 1 shows the average value, standard deviation, and number of defective films obtained in Examples 1 and 2 and Comparative Example 1.
- Example 3 [Device]
- a set similar to the raw material container, atomization means, control means, and measurement means used in Example 1 was added in parallel, and a pipe was connected on the secondary side of the two measurement means.
- the same device as in Example 1 was used.
- a c-plane sapphire substrate having a diameter of 4 inches (10 cm) and a thickness of 0.7 mm was placed on a stage and fixed by adsorption with a pump.
- Gallium acetylacetonate was dissolved in an acid solution of a mixture of hydrochloric acid and pure water to obtain a gallium solution with a gallium concentration of 0.2 mol/L, and aluminum acetylacetonate was dissolved in an acid solution of a mixture of hydrochloric acid and pure water to obtain an aluminum concentration.
- a 0.2 mol/L aluminum solution was prepared as a raw material solution 121 .
- Nitrogen gas was introduced into the two raw material containers 120 from nitrogen bombs, and the generated gas mixture was supplied to the film forming chamber 131 to form a film. At this time, the nitrogen flow rate was set so that the flow rates of the gallium solution mist and the aluminum solution mist in the gas mixture were each 0.5 g/min. After that, film formation was carried out for 60 minutes while controlling the material supply amount only by adjusting the outputs of the four ultrasonic vibrators. A similar procedure was repeated to prepare a total of 20 samples.
- XRD measurements confirmed that the films formed in all the samples were mixed crystals of ⁇ -phase Al 2 O 3 and Ga 2 O 3 . Furthermore, for all samples, the aluminum composition was evaluated by Vegard's law from the XRD spectra measured at four points in the plane of each sample, and the average value and standard deviation were calculated. Samples deviating from the average value by 5% or more were classified as defective.
- Example 2 A film was formed in the same manner as in Example 3, except that the amount of raw material supplied was not controlled. XRD measurements confirmed that the films formed in all the samples were mixed crystals of ⁇ -phase Al 2 O 3 and Ga 2 O 3 . After that, the composition was evaluated in the same manner as in Example 3.
- Table 2 shows the average value and standard deviation of the aluminum composition of the films obtained in Example 3 and Comparative Example 2, and the number of defective films.
- a film formation apparatus can be provided that has less variation in composition between samples and is capable of stably producing a more homogeneous film than the conventional technology.
- the film forming apparatus according to the present invention can be a highly productive film forming apparatus that can always stably produce a homogeneous film. Further, it was found that a uniform film can be stably produced with high productivity according to the film forming method of the present invention.
- the present invention is not limited to the above embodiments.
- the above-described embodiment is an example, and any device having substantially the same configuration as the technical idea described in the claims of the present invention and exhibiting the same effect is the present invention. included in the technical scope of
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Abstract
Description
原料溶液を霧化して原料ミストを形成する霧化手段と、
前記原料ミストを搬送するキャリアガス供給手段と、
前記原料ミストと前記キャリアガスが混合された混合気を基体表面に供給するミスト供給手段と、
前記基体を載置するステージと、
前記原料ミストの供給量を直接または間接的に測定して該測定で得られた測定値に応じた信号を出力する測定手段と、
前記信号を受信し、前記信号に基づいて前記原料ミストの供給量を調節する制御手段と
を具備するものである成膜装置を提供する。
前記基体をステージに載置するステップと、
前記原料溶液を霧化して前記原料ミストを生成するステップと、
前記原料ミストとキャリアガスを混合させて混合気を形成するステップと、
前記混合気を前記基体に供給して前記基体上に成膜を行うステップとを含み、
前記混合気を前記基体に供給して前記基体上に成膜を行うステップで、前記原料ミストの供給量を直接的または間接的に測定し、前記測定で得られた測定値と原料供給量の基準値からの偏差を算出し、前記偏差を解消するように、前記原料溶液の霧化量と前記キャリアガス供給量のいずれかまたは両方を調節する成膜方法を提供する。
原料溶液を霧化して原料ミストを形成する霧化手段と、
前記原料ミストを搬送するキャリアガス供給手段と、
前記原料ミストと前記キャリアガスが混合された混合気を基体表面に供給するミスト供給手段と、
前記基体を載置するステージと、
前記原料ミストの供給量を直接または間接的に測定して該測定で得られた測定値に応じた信号を出力する測定手段と、
前記信号を受信し、前記信号に基づいて前記原料ミストの供給量を調節する制御手段と
を具備するものである成膜装置である。
前記基体をステージに載置するステップと、
前記原料溶液を霧化して前記原料ミストを生成するステップと、
前記原料ミストとキャリアガスを混合させて混合気を形成するステップと、
前記混合気を前記基体に供給して前記基体上に成膜を行うステップとを含み、
前記混合気を前記基体に供給して前記基体上に成膜を行うステップで、前記原料ミストの供給量を直接的または間接的に測定し、前記測定で得られた測定値と原料供給量の基準値からの偏差を算出し、前記偏差を解消するように、前記原料溶液の霧化量と前記キャリアガス供給量のいずれかまたは両方を調節する成膜方法である。
本発明の成膜装置は、霧化手段と、キャリアガス供給手段と、ミスト供給手段と、基体を載置するステージと、原料ミストの供給量を直接または間接的に測定して該測定で得られた測定値に応じた信号を出力する測定手段と、信号を受信し、前記信号に基づいて前記原料ミストの供給量を調節する制御手段と、を具備するものである成膜装置である。以下詳細について説明する。
原料溶液121はミスト化が可能であれば特に限定されず、有機化合物の他、金属を錯体または塩の形態で、水や有機溶媒である溶媒に溶解あるいは分散させたものを用いることができる。
原料溶液121の霧化手段123は、原料溶液121を霧化または液滴化できさえすれば特に限定されず、公知の手段であってよいが、本発明においては、超音波を用いる霧化手段が好ましい。超音波を用いて得られたミストまたは液滴は、初速度がゼロであり、空中に浮遊するので好ましく、例えば、スプレーのように吹き付けるのではなく、空間に浮遊してガスとして搬送することが可能なミストであるので衝突エネルギーによる損傷がないため非常に好適である。液滴サイズは、特に限定されず、数mm程度の液滴であってもよいが、好ましくは50μm以下であり、より好ましくは0.1~10μmである。
原料容器120は、成膜する材料などに応じて複数台を備えていても良い。またこの場合、複数の原料容器120から成膜室131へ供給される混合気152は、それぞれ独立して成膜室131に供給されても良いし、配管124中、あるいは混合用の容器(不図示)などを別途設けて混合しても良い。この場合、後述の制御手段191aは原料容器毎に設置するのがよい。
キャリアガス供給手段111は、キャリアガス151を供給する。キャリアガス151の種類は特に限定されず、窒素やアルゴンといった不活性ガスの他、空気、酸素、オゾン、あるいは水素やフォーミングガスといった還元ガスを用いることもできるし、これらのガスを複数混合して用いることもできる。また、キャリアガス供給手段111は、空気圧縮機や各種ガスボンベまたは窒素ガス分離機などでもよい。またキャリアガス供給手段111は、フローメーターやマスフローコントローラーなど、キャリアガスの供給流量を調節する公知の流体流量調節器を備えていて良い。キャリアガスの供給流量は、基体サイズや成膜室の大きさにより適宜設定すればよく、例えば0.01~100L/分程度とすることができる。
測定手段171は配管124に設置され、混合気152に含まれる原料ミストの供給量を継続的に測定する。原料ミストの供給量の測定は、光散乱法、凝縮核計数法、エアロゾル・エレクトロメータ法やピエゾバランス法の他、ミストトラップやフィルターなどにより収集したミストあるいはミストの液体成分を蒸発させて得られる析出物を秤量する方法など公知のあらゆる測定方法が適用できる。また、配管124中を流れるミストそのものを測定してもよいし、配管124に枝管を設置して少量のミストをサンプリングし、該サンプルを測定して計算する形態としてもよい。また、配管124が複数設けられる場合、測定手段171はこれらすべての配管に設置されるのが良い。
次に、制御手段について説明する。制御手段の第一の形態として本発明では、前記制御手段が前記霧化手段を制御して、前記原料ミストの供給量を調節するものであることが好ましい。原料ミストの供給量を直接または間接的に測定して該測定で得られた測定値に応じた信号を出力する測定手段であれば特に限定されないが、例えば次のような形態の制御手段が好ましい。
成膜室131には、配管124に連結され、混合気152を成膜室131内に供給する供給管134が設置されている。供給管134は、たとえば石英やガラス、あるいは樹脂製のチューブ等を使用することができる。また供給管134からのミスト供給に影響を及ぼさない位置に排気ガスの排気配管133を設けていて良い。また排気配管133は図には示されていない除害手段に接続されていてもよい。この場合、除害手段は排気ガスに含まれる有害物質を除去できるものであれば特に限定されず、例えばミストトラップ、ウェットスクラバー、燃焼除害装置、バグフィルターといった公知の技術を広く適用することができる。
成膜室131の底部にはステージ132が設置されており、ステージ132には基体130が載置されている。
ミスト供給手段160は、混合気152を基体130表面に供給するものであれば特に限定されない。例えば、配管124と供給管134を合わせてミスト供給手段160とすることができる。
配管113、124は原料溶液121や成膜室131内外における温度などに対して十分な安定性を持ち、また特に配管124で供給ミスト量測定を行う場合には、十分な光透過性等、前記測定に適したものであれば特に限定されず、石英の他、ポリエチレン、ポリプロピレン、塩化ビニル、アクリル樹脂、シリコン樹脂、ウレタン樹脂、フッ素樹脂などといった一般的な樹脂製の配管を広く用いることができる。
また、本発明では、原料溶液を霧化して生成した原料ミストを基体表面に供給して前記基体上に成膜を行う成膜方法であって、
前記基体をステージに載置するステップと、
前記原料溶液を霧化して前記原料ミストを生成するステップと、
前記原料ミストとキャリアガスを混合させて混合気を形成するステップと、
前記混合気を前記基体に供給して前記基体上に成膜を行うステップとを含み、
前記混合気を前記基体に供給して前記基体上に成膜を行うステップで、前記原料ミストの供給量を直接的または間接的に測定し、前記測定で得られた測定値と原料供給量の基準値からの偏差を算出し、前記偏差を解消するように、前記原料溶液の霧化量と前記キャリアガス供給量のいずれかまたは両方を調節する成膜方法を提供する。即ち、本発明の上記成膜装置を用いた成膜方法であって、原料溶液をミスト化し、ミスト化された原料溶液(原料ミスト)を前記成膜装置のステージに載置された基体に供給して前記基体上に成膜を行うのと並行して、前記原料ミストの供給量を測定(監視)し、前記供給量の基準値を維持するように供給量を制御することを特徴とする成膜方法である
[装置]
図1の成膜装置において、キャリアガス供給部111に窒素ボンベを用い、窒素ボンベにマスフローコントローラーを接続し、マスフローコントローラーとホウ珪酸ガラス製の原料容器120をPFA製の配管113で接続した。霧化手段123には2.4MHzの超音波振動子を4個配置した超音波発生器を用意した。また石英製の成膜室131を用意し、石英製の供給管134と原料容器120を石英製の配管124で接続した。また、ステージ132には抵抗加熱型ヒーターを内蔵した炭化ケイ素製ホットプレートを用いた。
測定手段171としてワイドレンジパーティクルスペクトロメーター(MSP社製 1000xp)を用いた。また制御手段191aには超音波発生器駆動用電源を兼ねた制御ユニットを、また制御手段191bにはマスフローコントローラー制御用演算回路を用い、それぞれ超音波発生器とマスフローコントローラーに接続した。
直径4インチ(10cm)、厚さ0.7mmのc面サファイア基体をステージに載置してポンプで吸着固定した後、ヒーターでステージを加熱してステージ温度を500℃に保った。
塩酸と純水を混合した酸溶液にガリウムアセチルアセトナートを溶解してガリウム濃度0.2mol/Lの溶液を用意し、原料溶液121とした。
次に、原料容器120に原料溶液121を充填し、原料溶液121に2.4MHzの超音波振動を加えて霧化した。
窒素ボンベから窒素ガスを原料容器120に導入し、生成された混合気を成膜室131に供給して成膜をおこなった。このとき、混合気中の原料ミストの流量が1g/分となるように窒素流量を設定した。尚、当該流量は測定器で測定された単位時間当たりのミスト数と、別途測定された原料溶液の密度から算出された値である。
この後、4個の超音波振動子の出力調整のみによる原料供給量制御を行いながら、成膜を60分間行った。
同様の手順を繰り返し、合計20枚の試料を作製した。
XRD(Rigaku SmartLab)による測定により、全試料で形成された膜は全てα相のGa2O3であることが確認された。
この後、全試料について面内24点の膜厚を光反射率解析(Filmetrics F50)により測定し、試料間の平均値と標準偏差を評価した。また、該平均値から5%以上の乖離が生じた試料を不良として分類した。
実施例1で使用した装置において、4つの超音波振動子を一定出力で連続駆動したまま、原料供給量の制御を、キャリアガス流量調節のみで行い、それ以外は実施例1と同様に成膜を行った。
XRD(Rigaku SmartLab)による測定により、全試料で形成された膜は全てα相のGa2O3であることが確認された。
この後、実施例1と同様に膜厚の評価を行った。
原料供給量の制御を行わなかったことを除き、実施例1と同様に成膜をおこなった。
XRD(Rigaku SmartLab)による測定により、全試料で形成された膜は全てα相のGa2O3であることが確認された。
この後、実施例1と同様に膜厚の評価を行った。
[装置]
図1の成膜装置において、実施例1で用いた原料容器、霧化手段、制御手段および測定手段と同様の1組を並列に追加し、2つの測定手段の2次側で配管を接続した他は、実施例1と同様の装置を用いた。
直径4インチ(10cm)、厚さ0.7mmのc面サファイア基体をステージに載置してポンプで吸着固定した後、ヒーターでステージを加熱してステージ温度を500℃に保った。
塩酸と純水を混合した酸溶液にガリウムアセチルアセトナートを溶解してガリウム濃度0.2mol/Lのガリウム溶液と、塩酸と純水を混合した酸溶液にアルミニウムアセチルアセトナートを溶解してアルミニウム濃度0.2mol/Lのアルミニウム溶液を作製して原料溶液121とした。
次に、2つの原料容器120にガリウム溶液とアルミニウム溶液を別々に充填した後、2.4MHzの超音波振動を加えて霧化した。
窒素ボンベから窒素ガスを2つの原料容器120に導入し、生成された混合気を成膜室131に供給して成膜をおこなった。このとき、混合気中のガリウム溶液ミストとアルミニウム溶液ミストの流量がそれぞれ0.5g/分となるように窒素流量を設定した。
この後、4個の超音波振動子の出力調整のみによる原料供給量制御を行いながら、成膜を60分間行った。
同様の手順を繰り返し、合計20枚の試料を作製した。
XRDによる測定により、全試料で形成された膜は全てα相のAl2O3とGa2O3の混晶であることが確認された。さらに全試料において各試料の面内4点で測定したXRDスペクトルからVegard則によりアルミニウム組成を評価し、平均値と標準偏差を算出した。また該平均値から5%以上乖離した試料を不良として分類した。
原料供給量の制御を行わなかったことを除き、実施例3と同様に成膜をおこなった。
XRDによる測定により、全試料で形成された膜は全てα相のAl2O3とGa2O3の混晶であることが確認された。
この後、実施例3と同様に組成の評価を行った。
Claims (5)
- 成膜装置であって、
原料溶液を霧化して原料ミストを形成する霧化手段と、
前記原料ミストを搬送するキャリアガス供給手段と、
前記原料ミストと前記キャリアガスが混合された混合気を基体表面に供給するミスト供給手段と、
前記基体を載置するステージと、
前記原料ミストの供給量を直接または間接的に測定して該測定で得られた測定値に応じた信号を出力する測定手段と、
前記信号を受信し、前記信号に基づいて前記原料ミストの供給量を調節する制御手段と
を具備するものであることを特徴とする成膜装置。 - 前記制御手段が前記霧化手段を制御して、前記原料ミストの供給量を調節するものであることを特徴とする請求項1に記載の成膜装置。
- 前記制御手段が前記キャリアガス供給手段を制御して、前記原料ミストの供給量を調節するものであることを特徴とする請求項1または請求項2に記載の成膜装置。
- 原料溶液を霧化して生成した原料ミストを基体表面に供給して前記基体上に成膜を行う成膜方法であって、
前記基体をステージに載置するステップと、
前記原料溶液を霧化して前記原料ミストを生成するステップと、
前記原料ミストとキャリアガスを混合させて混合気を形成するステップと、
前記混合気を前記基体に供給して前記基体上に成膜を行うステップとを含み、
前記混合気を前記基体に供給して前記基体上に成膜を行うステップで、前記原料ミストの供給量を直接的または間接的に測定し、前記測定で得られた測定値と原料供給量の基準値からの偏差を算出し、前記偏差を解消するように、前記原料溶液の霧化量と前記キャリアガス供給量のいずれかまたは両方を調節することを特徴とする成膜方法。 - 前記測定の対象物を、前記原料ミスト、前記原料ミストからの析出物、前記原料ミスト由来の副生成物のいずれかまたはこれらの混合物とすることを特徴とする請求項4に記載の成膜方法。
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| US18/725,253 US20250129471A1 (en) | 2022-01-05 | 2022-12-07 | Film forming apparatus and film forming method |
| CN202280086225.6A CN118401700A (zh) | 2022-01-05 | 2022-12-07 | 成膜装置及成膜方法 |
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| JP2013028480A (ja) | 2011-07-27 | 2013-02-07 | Kochi Univ Of Technology | ドーパントを添加した結晶性の高い導電性α型酸化ガリウム薄膜およびその生成方法 |
| JP2016190174A (ja) | 2015-03-30 | 2016-11-10 | 株式会社Flosfia | 霧化装置および成膜装置 |
| JP2018178229A (ja) * | 2017-04-19 | 2018-11-15 | 株式会社Flosfia | 処理装置および処理方法 |
| JP2020074411A (ja) * | 2012-05-24 | 2020-05-14 | 株式会社ニコン | ミスト成膜装置 |
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| JP3386756B2 (ja) * | 1998-08-31 | 2003-03-17 | 松下電池工業株式会社 | 薄膜形成方法および薄膜形成装置 |
| JP2001259494A (ja) * | 2000-03-17 | 2001-09-25 | Matsushita Battery Industrial Co Ltd | 薄膜形成方法 |
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| JP2013028480A (ja) | 2011-07-27 | 2013-02-07 | Kochi Univ Of Technology | ドーパントを添加した結晶性の高い導電性α型酸化ガリウム薄膜およびその生成方法 |
| JP2020074411A (ja) * | 2012-05-24 | 2020-05-14 | 株式会社ニコン | ミスト成膜装置 |
| JP2016190174A (ja) | 2015-03-30 | 2016-11-10 | 株式会社Flosfia | 霧化装置および成膜装置 |
| JP2018178229A (ja) * | 2017-04-19 | 2018-11-15 | 株式会社Flosfia | 処理装置および処理方法 |
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| CN118401700A (zh) | 2024-07-26 |
| US20250129471A1 (en) | 2025-04-24 |
| TW202330982A (zh) | 2023-08-01 |
| EP4461846A1 (en) | 2024-11-13 |
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