WO2021187029A1 - 基板処理装置、半導体装置の製造方法及びプログラム - Google Patents
基板処理装置、半導体装置の製造方法及びプログラム Download PDFInfo
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- WO2021187029A1 WO2021187029A1 PCT/JP2021/006936 JP2021006936W WO2021187029A1 WO 2021187029 A1 WO2021187029 A1 WO 2021187029A1 JP 2021006936 W JP2021006936 W JP 2021006936W WO 2021187029 A1 WO2021187029 A1 WO 2021187029A1
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- gas
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- inert gas
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- wafer
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Images
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- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
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- C23C16/4401—Means for minimising impurities, e.g. dust, moisture or residual gas, in the reaction chamber
- C23C16/4408—Means for minimising impurities, e.g. dust, moisture or residual gas, in the reaction chamber by purging residual gases from the reaction chamber or gas lines
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- C—CHEMISTRY; METALLURGY
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- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45544—Atomic layer deposition [ALD] characterized by the apparatus
- C23C16/45546—Atomic layer deposition [ALD] characterized by the apparatus specially adapted for a substrate stack in the ALD reactor
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- 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
- C23C16/455—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 introducing gases into reaction chamber or for modifying gas flows in reaction chamber
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- C23C16/45574—Nozzles for more than one gas
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- 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
- C23C16/455—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 introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45563—Gas nozzles
- C23C16/45578—Elongated nozzles, tubes with holes
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- C—CHEMISTRY; METALLURGY
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- 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
- 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
- H01L21/04—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
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67155—Apparatus for manufacturing or treating in a plurality of work-stations
- H01L21/6719—Apparatus for manufacturing or treating in a plurality of work-stations characterized by the construction of the processing chambers, e.g. modular processing chambers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/673—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere using specially adapted carriers or holders; Fixing the workpieces on such carriers or holders
- H01L21/67303—Vertical boat type carrier whereby the substrates are horizontally supported, e.g. comprising rod-shaped elements
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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
- C23C16/46—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 heating the substrate
Definitions
- This disclosure relates to a substrate processing apparatus, a manufacturing method and a program of a semiconductor apparatus.
- International Publication No. 2018/154823 and International Publication No. 2016/157401 include a process of supplying a processing gas to a substrate (wafer) in a processing chamber to form a film on the substrate as one step of a semiconductor device. Will be done.
- An object of the present disclosure is to enable processing of large surface area wafers without increasing gas supply and exhaust.
- the first inert gas is supplied to the peripheral edge of the substrate in the processing chamber, and a mixed gas of the second inert gas different from the first inert gas and the processing gas is supplied to the surface of the substrate in the processing chamber.
- a technique comprising a step of supplying to and processing the substrate.
- FIG. 5 is a cross-sectional view taken along the line AA of the processing furnace of FIG.
- FIG. 5 is a block diagram which shows the structure of the controller which the substrate processing apparatus shown in FIG. 1 has. It is a figure which shows typically the distribution of the gas on the wafer when the 2nd inert gas which is easy to diffuse is used. It is a figure which shows typically the distribution of the gas on the wafer when the 2nd inert gas which is hard to diffuse is used. It is a diagram which shows the raw material gas concentration between the center and the end side of a wafer.
- the substrate processing apparatus is configured as an example of an apparatus used in the substrate processing process, which is one step of the manufacturing process of the semiconductor device (device).
- the substrate processing device 10 includes a first inert gas supply system 20, a processing gas supply system 30, and a controller 121 as an example of a control unit.
- the processing furnace 202 has a heater 207 as a heating means (heating mechanism).
- the heater 207 has a cylindrical shape and is vertically installed by being supported by a heater base (not shown) as a holding plate.
- a reaction tube 203 forming a reaction vessel is arranged concentrically with the heater 207.
- the reaction tube 203 is made of a heat-resistant material (for example, quartz (SiO 2 ) or silicon carbide (SiC)), and is formed in a cylindrical shape with the upper end closed and the lower end open.
- the processing chamber 201 is configured to accommodate the wafer 200 as a substrate in a state of being arranged in multiple stages in the vertical direction in a horizontal posture by a boat 217 described later.
- Nozzles 400a and 400b are provided in the processing chamber 201 so as to penetrate the side wall of the manifold 209.
- Gas supply pipes 410a and 410b as gas supply lines are connected to the nozzles 400a and 400b, respectively.
- the reaction tube 203 is provided with two types of nozzles 400a and 400b and two gas supply tubes 410a and 410b so that a plurality of types of gas can be supplied into the processing chamber 201.
- a mixed gas of a processing gas and an inert gas hereinafter referred to as a second inert gas
- a second inert gas as a carrier gas supplied in an inert state (under conditions of non-reaction) to the processing gas through the nozzle 400a.
- the nozzle 400b Can be supplied, and an inert gas different from the second inert gas (hereinafter referred to as the first inert gas) can be supplied through the nozzle 400b. That is, it is configured to be able to supply three types of gases, a processing gas, a first inert gas, and a second inert gas.
- the nozzles 400b are arranged so as to sandwich the nozzles 400a in the circumferential direction of the processing chamber 201. In addition, it may be configured so that four or more kinds of gases can be supplied.
- the processing furnace 202 of the present embodiment is not limited to the above-described embodiment.
- a metal manifold that supports the reaction tube 203 may be provided below the reaction tube 203, and each nozzle may be provided so as to penetrate the side wall of the manifold.
- the manifold may be further provided with an exhaust pipe 231 described later.
- the exhaust pipe 231 may be provided in the lower part of the reaction pipe 203 instead of the manifold.
- the furnace opening portion of the processing furnace 202 may be made of metal, and a nozzle or the like may be attached to the metal furnace opening portion.
- the nozzles 400a and 400b are configured as L-shaped long nozzles, and their horizontal portions are provided so as to penetrate the side wall of the manifold 209.
- the vertical portions of the nozzles 400a and 400b are formed in an annular space formed between the inner wall of the reaction tube 203 and the wafer 200, and are directed upward (upper in the loading direction of the wafer 200) along the inner wall of the reaction tube 203. It is provided so as to stand up (that is, to stand up from one end side to the other end side of the wafer arrangement region). That is, the nozzles 400a and 400b are provided along the wafer arrangement region in the region horizontally surrounding the wafer arrangement region on the side of the wafer arrangement region in which the wafer 200 is arranged.
- the vertical portion may be an ascending portion and a descending portion of the U-shaped pipe, or may be independent pipes.
- the vertical portions of the nozzle 400a are independent pipes, the vertical portions are branched and connected from the gas supply pipe 410a.
- the vertical portions of the nozzle 400b are independent pipes, the vertical portions are branched and connected from the gas supply pipe 410b.
- one of the two nozzles 400a may be used for supplying the processing gas, and the other may be used for supplying the second inert gas. Further, the nozzle 400a may have one vertical portion. Further, in FIG. 2, the arrangement of the nozzles 400a and 400b in a plan view is symmetrical, but the arrangement does not have to be symmetrical.
- a gas supply hole 401a for supplying (spouting) the mixed gas is provided on the side surface of the nozzle 400a.
- the gas supply hole 401a is opened so as to face, for example, the central portion (center side of the reaction tube 203) on the surface of the wafer 200 in the processing chamber 201.
- a plurality of the gas supply holes 401a are provided from the lower part to the upper part of the reaction tube 203, each having the same opening area, and further provided with the same opening pitch.
- the gas supply hole 401a is not limited to the above-mentioned form.
- the opening area may be gradually increased from the lower part to the upper part of the reaction tube 203. This makes it possible to make the flow rate of the gas supplied from the gas supply hole 401a uniform.
- a gas supply hole 401b for supplying (spouting) gas is provided on the side surface of the nozzle 400b. Specifically, the gas supply hole 401b is opened so as to face the peripheral edge of the wafer 200 in the processing chamber 201.
- a plurality of the gas supply holes 401b are provided from the lower part to the upper part of the reaction tube 203, each having the same opening area, and further provided with the same opening pitch.
- the gas supply hole 401b is not limited to the above-mentioned form.
- the opening area may be gradually increased from the lower part to the upper part of the reaction tube 203. This makes it possible to make the flow rate of the gas supplied from the gas supply hole 401b uniform.
- the gas supply method in the present embodiment is arranged in the annular vertically long space defined by the inner wall of the reaction tube 203 and the ends of the plurality of wafers 200, that is, in the cylindrical space.
- the gas is conveyed through the nozzles 400a and 400b.
- gas is ejected into the reaction tube 203 for the first time in the vicinity of the wafer 200 from the gas supply holes 401a and 401b opened in the nozzles 400a and 400b, respectively, and the main flow of gas in the reaction tube 203 is directed to the surface of the wafer 200.
- the gas can be uniformly supplied to each wafer 200, and there is an effect that the film thickness of the thin film formed on each wafer 200 can be made uniform.
- the gas that has flowed on the surface of each wafer 200 that is, the gas that remains after the reaction (residual gas), flows toward the exhaust port, that is, the exhaust pipe 231 that will be described later.
- the direction is appropriately specified by the position of the exhaust port, and is not limited to the vertical direction.
- the first inert gas supply system 20 is provided in the processing chamber 201 for processing the substrate, and is, for example, a nozzle 400b that supplies the first inert gas to the peripheral edge of the wafer 200 in the processing chamber 201.
- a gas supply pipe 410b or the like as the first inert gas supply line is connected to the nozzle 400b.
- the gas supply pipe 410b is provided with, for example, a mass flow controller (MFC) 412b as a flow rate control device and a valve 413b which is an on-off valve, in order from the upstream side.
- MFC mass flow controller
- nitrogen (N 2 ) gas as the first inert gas is supplied into the processing chamber 201 via the MFC 412b, the valve 413b, and the nozzle 400b.
- the first inert gas supplied from the gas supply pipe 410b acts as a purge gas or a dilution gas in the substrate processing step described later.
- the first inert gas supply system 20 is mainly composed of the gas supply pipe 410b, the MFC 412b, and the valve 413b.
- the nozzle 400b may be included in the first inert gas supply system 20. Since the first inert gas also acts as a purge gas, the first inert gas supply system 20 can also be referred to as a purge gas supply system.
- the processing gas supply system 30 is provided in the processing chamber 201 at a predetermined distance from the first inert gas supply system 20 in the circumferential direction of the substrate, and the processing gas and the first inert gas are different from each other through the nozzle 400a.
- the nozzles 400a are arranged so as to be separated from the two nozzles 400b by a predetermined distance in the circumferential direction of the processing chamber 201 and to be sandwiched between the nozzles 400b.
- a gas supply pipe 410a or the like is connected to the nozzle 400a.
- the second inert gas supply line in the gas supply pipe 410a is provided with, for example, a mass flow controller (MFC) 412a as a flow rate control device and valves 413a and 416a as on-off valves in order from the upstream side.
- MFC mass flow controller
- the second inert gas for example, hydrogen gas, helium gas, nitrogen gas (N 2 ), and argon gas can be used in the order of small molecular weight and easy diffusion.
- the second inert gas may be a noble gas.
- the second inert gas may be selected from the group consisting of He gas, Ne gas, Ar gas, Kr gas, and Xe gas. Further, the second inert gas may be selected according to the surface area of the wafer 200.
- the second inert gas may be composed of a gas having a diffusion coefficient different from that of the first inert gas.
- the second inert gas may be composed of a gas having a diffusion coefficient larger than that of the first inert gas.
- the processing gas supply system 30 may be configured so that the second inert gas can be selected according to the processing conditions. Further, the processing gas supply system 30 may be configured so that the concentration of the processing gas on the surface of the wafer 200 can be adjusted according to the type of the second inert gas.
- the molecular weight of the second inert gas and the molecular weight of the first inert gas may be different from each other.
- a gas having a molecular weight smaller than that of the first inert gas may be selected.
- the flow rate of the second inert gas may be set larger than the flow rate of the processing gas. Further, the flow rate of the second inert gas may be set to be larger than the flow rate of the processing gas and the flow rate of the first inert gas.
- a downstream end of the gas supply pipe 410c as a processing gas supply line is connected between the valve 413a and the valve 416a in the gas supply pipe 410a. At this portion, the processing gas and the second inert gas merge.
- the gas supply pipe 410c is provided with an MFC 412c, a valve 413c as an on-off valve, a vaporizer 414c, and a valve 415a in this order from the upstream side.
- a metal-containing gas containing a metal element is supplied into the processing chamber 201 via the MFC 412c, the valve 413c, the vaporizer 414c, the valve 415a, and the nozzle 400a.
- the metal-containing gas is, for example, a raw material gas containing a metal element such as Al, Ti, Hf, Zr, Ta, Mo, and W.
- raw material when used in the present specification, it may mean “liquid raw material in a liquid state”, “raw material gas in a gaseous state”, or both. be.
- the processing gas supply system 30 is mainly composed of gas supply pipes 410a, 410c, MFC412a, 412c, valves 413a, 413c, 415a, 416a, and a vaporizer 414c.
- the nozzle 400a may be included in the processing gas supply system 30.
- the treated gas supply system 30 can also be simply referred to as a gas supply system.
- the metal-containing gas as the raw material gas as described above flows from the gas supply pipe 410c
- the metal-containing gas as the raw material gas supply system is mainly supplied by the gas supply pipe 410c, the MFC 412c, the valve 413c, the vaporizer 414c, and the valve 415a.
- the system is constructed.
- the nozzle 400a may be included in the raw material gas supply system.
- the reaction pipe 203 is provided with an exhaust pipe 231 for exhausting the atmosphere in the processing chamber 201.
- the exhaust pipe 231 is provided via a pressure sensor 245 as a pressure detector (pressure detector) for detecting the pressure in the processing chamber 201 and an APC (Auto Pressure Controller) valve 243 as a pressure regulator (pressure regulator).
- a vacuum pump 246 as a vacuum exhaust device is connected.
- the APC valve 244 can perform vacuum exhaust and vacuum exhaust stop in the processing chamber 201 by opening and closing the valve with the vacuum pump 246 operating, and further, with the vacuum pump 246 operating, the APC valve 244 can perform vacuum exhaust and vacuum exhaust stop.
- the valve is configured so that the pressure in the processing chamber 201 can be adjusted by adjusting the valve opening degree based on the pressure information detected by the pressure sensor 245.
- the exhaust system is mainly composed of an exhaust pipe 231, an APC valve 243, and a pressure sensor 245.
- the vacuum pump 246 may be included in the exhaust system.
- a seal cap 219 is provided as a furnace palate body that can airtightly close the lower end opening of the reaction tube 203.
- the seal cap 219 is configured to come into contact with the lower end of the reaction tube 203 from the lower side in the vertical direction.
- the seal cap 219 is made of a metal such as SUS and is formed in a disk shape.
- An O-ring 220 as a sealing member that comes into contact with the lower end of the reaction tube 203 is provided on the upper surface of the seal cap 219.
- a rotation mechanism 267 for rotating the boat 217 which will be described later, is installed.
- the rotation shaft 255 of the rotation mechanism 267 penetrates the seal cap 219 and is connected to the boat 217.
- the rotation mechanism 267 is configured to rotate the wafer 200 by rotating the boat 217.
- the seal cap 219 is configured to be vertically lifted and lowered by a boat elevator 115 as a lifting mechanism vertically installed outside the reaction tube 203.
- the boat elevator 115 is configured so that the boat 217 can be carried in and out of the processing chamber 201 by raising and lowering the seal cap 219. That is, the boat elevator 115 is configured as a transport device (convey mechanism) for transporting the boat 217, that is, the wafer 200, into and out of the processing chamber 201.
- the boat 217 as a substrate support supports a plurality of wafers, for example 25 to 200 wafers, in a horizontal position and vertically aligned with each other, that is, in a multi-stage manner. It is configured to be arranged at intervals.
- the boat 217 is made of a heat resistant material such as quartz or SiC.
- a heat insulating plate 218 made of a heat-resistant material such as quartz or SiC is supported in a horizontal posture in multiple stages. With this configuration, the heat from the heater 207 is less likely to be transferred to the seal cap 219 side.
- this embodiment is not limited to the above-described embodiment.
- a heat insulating cylinder configured as a tubular member made of a heat-resistant material such as quartz or SiC may be provided.
- a temperature sensor 263 as a temperature detector is installed in the reaction tube 203, and the temperature in the processing chamber 201 can be adjusted by adjusting the amount of electricity supplied to the heater 207 based on the temperature information detected by the temperature sensor 263. It is configured to have a desired temperature distribution.
- the temperature sensor 263 is L-shaped like the nozzles 400a and 400b, and is provided along the inner wall of the reaction tube 203.
- the controller 121 is configured as a computer including a CPU (Central Processing Unit) 121a, a RAM (Random Access Memory) 121b, a storage device 121c, and an I / O port 121d.
- the RAM 121b, the storage device 121c, and the I / O port 121d are configured so that data can be exchanged with the CPU 121a via the internal bus.
- An input / output device 122 configured as, for example, a touch panel is connected to the controller 121.
- the storage device 121c is composed of, for example, a flash memory, an HDD (Hard Disk Drive), or the like.
- a control program for controlling the operation of the substrate processing device, a process recipe in which the procedures and conditions for substrate processing described later are described, and the like are readablely stored.
- the process recipes are combined so that the controller 121 can execute each procedure in the substrate processing step described later and obtain a predetermined result, and functions as a program.
- this process recipe, control program, etc. are collectively referred to as a program.
- the term program is used in the present specification, it may include only a process recipe alone, a control program alone, or both.
- the RAM 121b is configured as a memory area (work area) in which programs, data, and the like read by the CPU 121a are temporarily held.
- the I / O port 121d includes the above-mentioned MFC 412a, 412b, valves 413a to 413c, 415a, 416a, vaporizer 414c, APC valve 243, pressure sensor 245, vacuum pump 246, heater 207, temperature sensor 263, rotation mechanism 267, and boat. It is connected to an elevator 115 or the like.
- the CPU 121a is configured to read and execute a control program from the storage device 121c and read a process recipe from the storage device 121c in response to an input of an operation command from the input / output device 122 or the like. According to the read process recipe, the CPU 121a uses the flow adjustment operation of various gases of the MFCs 412a and 412b, the opening and closing operations of the valves 413a to 413c, 415a and 416a, the vaporization operation of the vaporizer 414c, the opening and closing operation of the APC valve 243 and the APC valve 243.
- Pressure adjustment operation based on pressure sensor 245, temperature adjustment operation of heater 207 based on temperature sensor 263, start and stop of vacuum pump 246, rotation and rotation speed adjustment operation of boat 217 by rotation mechanism 267, boat 217 by boat elevator 115 It is configured to control the ascending / descending motion and the like.
- the controller 121 is stored in an external storage device (for example, magnetic tape, magnetic disk such as flexible disk or hard disk, optical disk such as CD or DVD, magneto-optical disk such as MO, semiconductor memory such as USB memory or memory card) 123.
- the above-mentioned program can be configured by installing it on a computer.
- the storage device 121c and the external storage device 123 are configured as a computer-readable recording medium. Hereinafter, these are collectively referred to simply as a recording medium.
- recording medium When the term recording medium is used in the present specification, it may include only the storage device 121c alone, it may include only the external storage device 123 alone, or it may include both of them.
- the program may be provided to the computer by using a communication means such as the Internet or a dedicated line without using the external storage device 123.
- the program according to the present embodiment is provided in the processing chamber 201 for processing the wafer 200, and the first inert gas supply system 20 for supplying the first inert gas to the peripheral edge of the wafer 200 in the processing chamber 201, and the processing chamber.
- a mixed gas of a second inert gas which is provided in the circumferential direction of the wafer 200 at a predetermined distance from the first inert gas supply system 20 and is different from the first inert gas, and a processing gas is applied to the wafer 200.
- This is a program to be executed by the substrate processing apparatus 10 provided with the above, wherein the wafer 200 is carried into the processing chamber 201, and the first inert gas is supplied to the peripheral portion of the peripheral portion of the wafer 200 in the processing chamber 201. It is a procedure of supplying the mixed gas to the surface of the wafer 200 in the processing chamber 201 to process the wafer 200, and a program of causing the substrate processing apparatus 10 to execute the mixed gas by a computer.
- the method for manufacturing the semiconductor device includes a step of bringing the wafer 200 into the processing chamber 201 for processing the wafer 200 as an example of the substrate, and a peripheral portion of the wafer 200 in the processing chamber 201 for the first inert gas.
- the wafer 200 is processed by supplying a mixed gas of a second inert gas different from the first inert gas and the processing gas to the surface of the wafer 200 in the processing chamber 201.
- performing a process means performing this process, etc. once or a plurality of times. That is, it means that the process is performed once or more.
- FIG. 4 shows an example in which each process (cycle) is repeated n cycles at a time. The value of n is appropriately selected according to the film thickness required for the film to be finally formed. That is, the number of times each of the above-mentioned treatments is performed is determined according to the target film thickness.
- wafer When the word “wafer” is used in the present specification, it means “wafer itself” or “a laminate (aggregate) of a wafer and a predetermined layer or film formed on the surface thereof). “(That is, a wafer including a predetermined layer, film, etc. formed on the surface) may be used.
- wafer surface when the term “wafer surface” is used in the present specification, it means “the surface of the wafer itself (exposed surface)” or “the surface of a predetermined layer or film formed on the wafer”. That is, it may mean “the outermost surface of the wafer as a laminated body”.
- supplying a predetermined gas to a wafer in the present specification means “directly supplying a predetermined gas to the surface (exposed surface) of the wafer itself” or , "A predetermined gas is supplied to a layer, a film, or the like formed on the wafer, that is, to the outermost surface of the wafer as a laminated body.”
- a predetermined layer (or film) is formed on a wafer
- a predetermined layer (or film) is directly formed on the surface (exposed surface) of the wafer itself. This means that, or “a predetermined layer (or film) is formed on a layer, a film, or the like formed on the wafer, that is, on the outermost surface of the wafer as a laminated body". In some cases.
- wafer is also used in the present specification in the same manner as when the term “wafer” is used. In that case, if the term “wafer” is replaced with “wafer” in the above description. good.
- metal film means a film composed of a conductive substance containing a metal atom, which includes a conductive metal nitride film (metal nitride film) and a conductive metal.
- Oxide film metal oxide film
- conductive metal oxynitride film metal oxynitride film
- conductive metal composite film conductive metal alloy film
- conductive metal alloy film metal VDD film
- conductivity includes a conductive metal carbide film (metal carbide film), a conductive metal carbonitride film (metal carbonite ride film), and the like.
- the inside of the processing chamber 201 that is, the space where the wafer 200 exists is evacuated by the vacuum pump 246 so as to have a desired pressure (vacuum degree).
- the pressure in the processing chamber 201 is measured by the pressure sensor 245, and the APC valve 243 is feedback-controlled based on the measured pressure information (pressure adjustment).
- the vacuum pump 246 is always kept in operation until at least the processing on the wafer 200 is completed. Further, the inside of the processing chamber 201 is heated by the heater 207 so as to have a desired temperature.
- the amount of electricity supplied to the heater 207 is feedback-controlled based on the temperature information detected by the temperature sensor 263 so that the inside of the processing chamber 201 has a desired temperature distribution (temperature adjustment).
- the heating in the processing chamber 201 by the heater 207 is continuously performed at least until the processing on the wafer 200 is completed.
- the rotation mechanism 267 starts the rotation of the boat 217 and the wafer 200.
- the rotation of the boat 217 and the wafer 200 by the rotation mechanism 267 is continuously performed at least until the processing on the wafer 200 is completed.
- FIGS. 4 and 5 a step of supplying the first inert gas to the peripheral edge of the wafer 200 and supplying the mixed gas to the surface of the substrate to process the wafer 200 will be described.
- FIG. 4 schematically shows the distribution of gas on the wafer 200 when the processing gas (gas A), the second inert gas (gas B), and the first inert gas (gas C) are supplied. It is a figure.
- the second inert gas (gas B) in the mixed gas diffuses. Then, it mixes with the first inert gas (gas C). As a result, the concentration of the second inert gas (gas B) in the central portion of the wafer 200 decreases.
- the processing gas and the first inert gas have slow diffusion rates, the processing gas (gas A) remains in the central portion of the wafer 200. Therefore, the concentration of the processing gas (gas A) in the central portion of the wafer 200 can be increased. In particular, when hydrogen gas having the smallest molecular weight is used as the second inert gas, the concentration of the processing gas in the central portion of the wafer 200 can be increased.
- FIG. 5 is a diagram schematically showing the distribution of the gas on the wafer 200 when the processing gas, the second inert gas, and the first inert gas are supplied.
- the concentration of the processing gas (gas A) in the central portion of the wafer 200 can be increased or decreased by selecting the second inert gas (gas B). Therefore, the processing gas supply system 30 may be provided with a plurality of second inert gas supply pipes so that the second inert gas can be appropriately selected.
- the second inert gas is, for example, hydrogen gas or helium gas. , Or argon gas is used.
- FIG. 6 is a diagram showing the raw material gas concentration between the center and the end side of the wafer 200. This shows how the concentration of the raw material gas, which is the processing gas, depends on the type of the second inert gas.
- the gas a has the smallest molecular weight
- the gas b and the gas c have gradually larger molecular weights
- the gas e has the largest molecular weight.
- the concentration of the raw material gas at the center of the wafer 200 tends to increase as the molecular weight of the second inert gas decreases.
- the raw material gas concentration on the end side of the wafer 200 is low regardless of the gas type. Therefore, in the present embodiment, by adjusting the first inert gas, for example, thickness uniformity on the wafer 200 while suppressing the diffusion of the supplies to the end source gas of N 2 wafer 200.
- the amount of gas required has increased with the increase in the number of layers of wafers.
- the partial pressure of gas on the wafer decreases as the number of layers increases from the bare wafer.
- the difference in gas partial pressure between the center of the wafer and the edge (called Wafer In Wafer: WiW) also tends to decrease, and it is considered that the gas supply to the center of the wafer is reduced.
- the decrease in partial pressure can be controlled by extending the processing time, but WiW cannot be easily controlled because it is determined by the wafer and gas flow. According to this embodiment, the WiW can also be easily controlled. This also makes it possible to control the decrease in WiW in the multilayer wafer.
- the present disclosure is not limited to the above-described embodiment, and various changes can be made without departing from the gist thereof.
- the first inert gas may be supplied not only to the end portion of the wafer 200 but also between the wafer 200 and the reaction tube 203, and for example, the first inert gas may be supplied.
- a plurality of pipes may be provided.
- the metal elements hafnium (Hf), tantalum (Ta), tungsten (W), cobalt (Co), ittrium (Y), ruthenium (Ru), aluminum (Al), titanium (Ti), It is also suitable for forming a nitride film containing elements such as zirconium (Zr), molybdenum (Mo), silicon (Si), an oxide film, a carbonized film, a boring film, or a composite film thereof. Applicable.
- hafnium (Hf) -containing gas, tantalum (Ta) -containing gas, tungsten (W) -containing gas, cobalt (Co) -containing gas, yttrium (Y) -containing gas, and ruthenium are used as raw material gases.
- (Ru) -containing gas, aluminum (Al) -containing gas, tantalum (Ti) -containing gas, zirconium (Zr) -containing gas, molybdenum (Mo) -containing gas, silicon (Si) -containing gas and the like can be used.
- the first inert gas has been described an example of using N 2 gas, not limited to this, Ar gas, He gas, Ne gas, a rare gas such as Xe gas used You may.
- processing conditions at this time can be, for example, the same processing conditions as those in the above-described embodiment.
- the process recipe (program that describes the treatment procedure, treatment conditions, etc.) used for forming these various thin films is the content of the substrate treatment (film type, composition ratio, film quality, film thickness, treatment procedure, treatment of the thin film to be formed). It is preferable to prepare each individually (multiple preparations are made) according to the conditions, etc.). Then, when starting the substrate processing, it is preferable to appropriately select an appropriate process recipe from a plurality of process recipes according to the content of the substrate processing. Specifically, a plurality of process recipes individually prepared according to the content of the board processing are stored in the board processing device via a telecommunication line or a recording medium (external storage device) in which the process recipe is recorded. It is preferable to store (install) it in the device in advance.
- the CPU included in the substrate processing apparatus may appropriately select an appropriate process recipe from a plurality of process recipes stored in the storage device according to the content of the substrate processing. preferable.
- thin films of various film types, composition ratios, film qualities, and film thicknesses can be formed with a single substrate processing device in a versatile and reproducible manner. Further, the operation load of the operator (input load of processing procedure, processing condition, etc.) can be reduced, and the board processing can be started quickly while avoiding operation mistakes.
- the above-mentioned process recipe can be realized not only when newly created but also by changing the process recipe of the existing substrate processing apparatus, for example.
- the process recipe according to the present disclosure may be installed on an existing board processing device via a telecommunications line or a recording medium on which the process recipe is recorded, or input / output of the existing board processing device. It is also possible to operate the device and change the process recipe itself to the process recipe according to the present disclosure.
- a substrate processing apparatus which is a batch type vertical apparatus for processing a plurality of substrates at a time, and a nozzle for supplying a processing gas is erected in one reaction tube, and the reaction tube is provided.
- a processing furnace having a structure having an exhaust port at the bottom has been described
- the present disclosure can also be applied to the case of forming a film using a processing furnace having another structure.
- it has two reaction tubes having concentric cross sections (the outer reaction tube is called an outer tube and the inner reaction tube is called an inner tube), and from a nozzle erected in the inner tube, a side wall of the outer tube is used.
- the present disclosure can also be applied to the case where the film is formed using a processing furnace having a structure in which the processing gas flows to the exhaust port that opens at a position facing the nozzle (a position symmetrical with respect to the line) across the substrate.
- the processing gas may be supplied not from a nozzle erected in the inner tube but from a gas supply port opened in the side wall of the inner tube.
- the exhaust port that opens in the outer tube may be opened according to the height at which a plurality of substrates accommodated in a laminated manner in the processing chamber exist.
- the shape of the exhaust port may be a hole shape or a slit shape.
- the present disclosure is not limited to this, and the present disclosure is not limited to this, and all at once. It can also be suitably applied to the case of forming a film using a single-wafer type substrate processing apparatus that processes one or several substrates. Further, in the above-described embodiment, an example of forming a thin film by using a substrate processing apparatus having a hot wall type processing furnace has been described, but the present disclosure is not limited to this, and the present disclosure includes a cold wall type processing furnace. It can also be suitably applied to the case of forming a thin film using a substrate processing apparatus. Even in these cases, the processing conditions can be, for example, the same processing conditions as those in the above-described embodiment.
- This embodiment can be applied not only to semiconductor manufacturing equipment but also to equipment for processing glass substrates such as LCD equipment.
- the film type is not particularly limited.
- metal compounds W, Ti, Hf, etc.
- silicon compounds SiN, Si, etc.
- the film forming process includes, for example, a process of forming a CVD, PVD, oxide film, and a nitride film, a process of forming a film containing a metal, and the like.
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Abstract
Description
第1不活性ガスを前記処理室における前記基板の周縁部に供給すると共に、前記第1不活性ガスとは異なる第2不活性ガスと処理ガスとの混合ガスを前記処理室における前記基板の表面に供給し、前記基板を処理する工程と、を有する技術が提供される。
以下、本開示の実施形態について図1~3を用いて説明する。なお、以下の説明において用いられる図面は、いずれも模式的なものであり、図面に示される、各要素の寸法の関係、各要素の比率等は、現実のものとは必ずしも一致していない。また、複数の図面の相互間においても、各要素の寸法の関係、各要素の比率等は必ずしも一致していない。
基板処理装置は、半導体装置(デバイス)の製造工程の一工程である基板処理工程において使用される装置の一例として構成されている。この基板処理装置10は、第1不活性ガス供給系20と、処理ガス供給系30と、制御部の一例としてのコントローラ121とを備えている。
処理炉202は加熱手段(加熱機構)としてのヒータ207を有する。ヒータ207は円筒形状であり、保持板としてのヒータベース(図示せず)に支持されることにより垂直に据え付けられている。
第1不活性ガス供給系20は、基板を処理する処理室201に設けられ、処理室201におけるウエハ200の周縁部に第1不活性ガスを供給する例えばノズル400bである。ノズル400bには、第1不活性ガス供給ラインとしてのガス供給管410b等が接続されている。ガス供給管410bには、上流側から順に、例えば流量制御装置としてのマスフローコントローラ(MFC)412bと、開閉弁であるバルブ413bが設けられている。
処理ガス供給系30は、処理室201に、基板の周方向において第1不活性ガス供給系20から所定距離離れて設けられ、ノズル400aを通じて、処理ガスと、第1不活性ガスとは異なる第2不活性ガスとの混合ガスを処理室201におけるウエハ200の表面に供給するための例えばノズル400aである。ノズル400aは、処理室201の周方向において、2つのノズル400bから所定距離離れると共に、該ノズル400bに挟まれるように配置されている。
反応管203には、処理室201内の雰囲気を排気する排気管231が設けられている。排気管231には、処理室201内の圧力を検出する圧力検出器(圧力検出部)としての圧力センサ245および圧力調整器(圧力調整部)としてのAPC(Auto Pressure Controller)バルブ243を介して、真空排気装置としての真空ポンプ246が接続されている。APCバルブ244は、真空ポンプ246を作動させた状態で弁を開閉することで、処理室201内の真空排気および真空排気停止を行うことができ、さらに、真空ポンプ246を作動させた状態で、圧力センサ245により検出された圧力情報に基づいて弁開度を調節することで、処理室201内の圧力を調整することができるように構成されているバルブである。主に、排気管231、APCバルブ243、圧力センサ245により、排気系が構成される。真空ポンプ246を排気系に含めて考えてもよい。
図3に示すように、コントローラ121は、CPU(Central Processing Unit)121a,RAM(Random Access Memory)121b,記憶装置121c,I/Oポート121dを備えたコンピュータとして構成されている。RAM121b,記憶装置121c,I/Oポート121dは、内部バスを介して、CPU121aとデータ交換可能なように構成されている。コントローラ121には、例えばタッチパネル等として構成された入出力装置122が接続されている。
本実施形態に係るプログラムは、ウエハ200を処理する処理室201に設けられ、処理室201におけるウエハ200の周縁部に第1不活性ガスを供給する第1不活性ガス供給系20と、処理室201に、ウエハ200の周方向において第1不活性ガス供給系20から所定距離離れて設けられ、第1不活性ガスとは異なる第2不活性ガスと、処理ガスとの混合ガスをウエハ200の表面に供給する処理ガス供給系と、混合ガスと第1不活性ガスを供給して、ウエハ200を処理するように処理ガス供給系および第1不活性ガス供給系20を制御するコントローラ121と、を備えた基板処理装置10に実行させるプログラムであって、処理室201にウエハ200を搬入する手順と、第1不活性ガスを処理室201におけるウエハ200の周縁部の周縁部に供給すると共に、混合ガスを処理室201におけるウエハ200の表面に供給し、ウエハ200を処理する手順と、コンピュータによって基板処理装置10に実行させるプログラムである。
続いて、半導体装置(デバイス)の製造工程の一工程である基板処理工程について説明する。本実施形態に係る半導体装置の製造方法は、基板の一例としてのウエハ200を処理する処理室201に該ウエハ200を搬入する工程と、第1不活性ガスを処理室201におけるウエハ200の周縁部に供給すると共に、第1不活性ガスとは異なる第2不活性ガスと、処理ガスとの混合ガスを処理室201におけるウエハ200の表面に供給し、ウエハ200を処理する工程と、を有する。
複数枚のウエハ200がボート217に装填(ウエハチャージ)されると、図1に示されているように、複数枚のウエハ200を支持したボート217は、ボートエレベータ115によって持ち上げられて処理室201内に搬入(ボートロード)される。この状態で、シールキャップ219はOリング220を介して反応管203の下端開口を閉塞した状態となる。
処理室201内、すなわち、ウエハ200が存在する空間が所望の圧力(真空度)となるように真空ポンプ246によって真空排気される。この際、処理室201内の圧力は、圧力センサ245で測定され、この測定された圧力情報に基づき、APCバルブ243がフィードバック制御される(圧力調整)。真空ポンプ246は、少なくともウエハ200に対する処理が完了するまでの間は常時作動させた状態を維持する。また、処理室201内が所望の温度となるようにヒータ207によって加熱される。この際、処理室201内が所望の温度分布となるように、温度センサ263が検出した温度情報に基づきヒータ207への通電量がフィードバック制御される(温度調整)。ヒータ207による処理室201内の加熱は、少なくともウエハ200に対する処理が完了するまでの間は継続して行われる。続いて、回転機構267によりボート217およびウエハ200の回転を開始する。回転機構267によるボート217およびウエハ200の回転は、少なくとも、ウエハ200に対する処理が完了するまでの間は継続して行われる。
続いて、図4、図5において、ウエハ200の周縁部に第1不活性ガスを供給すると共に混合ガスを基板の表面に供給し、ウエハ200を処理する工程について説明する。図4は、処理ガス(ガスA)と、第2不活性ガス(ガスB)と、第1不活性ガス(ガスC)を供給した場合におけるウエハ200上でのガスの分布を模式的に示した図である。
近年ウエハの多層化に伴い必要なガス量が増加している。ウエハの横からガスを供給した場合、ベアウエハから多層化が進むにつれウエハ上のガス分圧の低下することが考えられる。その際ウエハ中央とエッジのガス分圧の差(Wafer In Wafer:WiWと呼ぶ)についても低下する傾向にあり、ウエハ中央へのガス供給が少なくなると考えられる。分圧の低下に関しては、処理時間を延ばすことで制御は可能であるがWiWについてはウエハとガス流れによって決まってしまうため容易に制御できない。本実施形態によれば、このWiWについても容易に制御可能である。またこれにより、多層化ウエハでのWiWの低下を制御することもできる。
本明細書に記載されたすべての文献、特許出願、および技術規格は、個々の文献、特許出願、および技術規格が参照により取り込まれることが具体的かつ個々に記された場合と同程度に、本明細書中に参照により取り込まれる。
Claims (16)
- 基板を処理する処理室内に前記基板を搬入する工程と、
第1不活性ガスを前記処理室における前記基板の周縁部に供給すると共に、前記第1不活性ガスとは異なる第2不活性ガスと処理ガスとの混合ガスを前記処理室における前記基板の表面に供給し、前記基板を処理する工程と、
を有する半導体装置の製造方法。 - 処理条件に応じて前記第2不活性ガスを選択することが可能に構成される請求項1に記載の半導体装置の製造方法。
- 前記第2不活性ガスの種類に応じて前記基板表面の前記処理ガスの濃度を調整することが可能に構成される請求項1に記載の半導体装置の製造方法。
- 前記第2不活性ガスは、前記第1不活性ガスと比べて拡散係数の異なるガスで構成される請求項1に記載の半導体装置の製造方法。
- 前記第2不活性ガスは、前記第1不活性ガスと比べて拡散係数の大きいガスで構成される請求項4に記載の半導体装置の製造方法。
- 前記第2不活性ガスの分子量と、前記第1不活性ガスの分子量を異ならせることが可能に構成される請求項1に記載の半導体装置の製造方法。
- 前記第2不活性ガスは、前記第1不活性ガスの分子量よりも分子量が小さいガスが選択される請求項6に記載の半導体装置の製造方法。
- 前記第2不活性ガスの流量は、前記処理ガスの流量よりも大きく設定される請求項1に記載の半導体装置の製造方法。
- 前記第2不活性ガスの流量は、前記処理ガスの流量および前記第1不活性ガスの流量よりも大きく設定される請求項1に記載の半導体装置の製造方法。
- 前記基板の表面積に応じて前記第2不活性ガスを選択する請求項1に記載の半導体装置の製造方法。
- 前記第2不活性ガスは希ガスである請求項1~請求項10の何れか1項に記載の半導体装置の製造方法。
- 前記第2不活性ガスは、Heガス、Neガス、Arガス、Krガス、Xeガスよりなる群から選択される請求項11に記載の半導体装置の製造方法。
- 基板を処理する処理室に設けられ、前記処理室における前記基板に複数の不活性ガスを供給する不活性ガス供給系と、
前記処理室における前記基板に処理ガスを供給する処理ガス供給系と、
前記複数の不活性ガスのうち第1不活性ガスを前記基板の周縁部に供給すると共に、前記第1不活性ガスとは異なる第2不活性ガスと前記処理ガスとの混合ガスを前記基板の表面に供給して、前記基板を処理するように前記処理ガス供給系および前記不活性ガス供給系を制御することが可能な制御部と、
を備えた基板処理装置。 - 前記不活性ガス供給系と前記処理ガス供給系は、前記基板の周方向においてから所定距離離れて前記処理室に設けられる請求項13に記載の基板処理装置。
- 前記不活性ガス供給系は、前記処理ガス供給系の両側に配置されるよう構成される請求項13に記載の基板処理装置。
- コンピュータに、
処理室に基板を搬入する手順と、
第1不活性ガスを前記処理室における前記基板の周縁部に供給すると共に、前記第1不活性ガスとは異なる第2不活性ガスと処理ガスとの混合ガスを前記処理室における前記基板の表面に供給し、前記基板を処理する手順と、
を実行させるプログラム。
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