WO2018173182A1 - 半導体装置の製造方法、基板処理装置およびプログラム - Google Patents
半導体装置の製造方法、基板処理装置およびプログラム Download PDFInfo
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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
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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
- H10P14/63—Formation of materials, e.g. in the shape of layers or pillars of insulating materials characterised by the formation processes
- H10P14/6326—Deposition processes
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
- H10P72/06—Apparatus for monitoring, sorting, marking, testing or measuring
- H10P72/0602—Temperature monitoring
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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
- C23C16/56—After-treatment
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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
- H10P14/60—Formation of materials, e.g. in the shape of layers or pillars of insulating materials
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- 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
- H10P14/60—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
- H10P14/6334—Deposition from the gas or vapour phase using decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
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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
- H10P14/66—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
- H10P14/6681—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 the precursor containing a compound comprising Si
- H10P14/6687—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 the precursor containing a compound comprising Si the compound comprising silicon and nitrogen
- H10P14/6689—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 the precursor containing a compound comprising Si the compound comprising silicon and nitrogen the compound being a silazane
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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
- H10P14/68—Organic materials, e.g. photoresists
- H10P14/683—Organic materials, e.g. photoresists carbon-based polymeric organic materials, e.g. polyimides, poly cyclobutene or PVC
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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
- H10P14/6903—Inorganic materials containing silicon
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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
- H10P14/69—Inorganic materials
- H10P14/692—Inorganic materials composed of oxides, glassy oxides or oxide-based glasses
- H10P14/6921—Inorganic materials composed of oxides, glassy oxides or oxide-based glasses containing silicon
- H10P14/69215—Inorganic materials composed of oxides, glassy oxides or oxide-based glasses containing silicon the material being a silicon oxide, e.g. SiO2
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
- H10P72/04—Apparatus for manufacture or treatment
- H10P72/0402—Apparatus for fluid treatment
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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
- H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
- H10P72/04—Apparatus for manufacture or treatment
- H10P72/0431—Apparatus for thermal treatment
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- H—ELECTRICITY
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- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P95/00—Generic processes or apparatus for manufacture or treatments not covered by the other groups of this subclass
- H10P95/90—Thermal treatments, e.g. annealing or sintering
Definitions
- the present invention relates to a semiconductor device manufacturing method, a substrate processing apparatus, and a program.
- a substrate processing process for processing a film formed on the surface of the substrate may be performed by supplying a processing gas containing hydrogen peroxide to the substrate (for example, a patent) References 1 and 2).
- An object of the present invention is to provide a technique capable of improving the quality of substrate processing performed using hydrogen peroxide.
- the film containing the silazane bond is formed.
- a first step of reforming After the first step, the substrate is heated to a second temperature higher than the first temperature, and a second processing gas containing hydrogen peroxide is supplied to the substrate to contain the silazane bond.
- a second step of modifying the film to be A technique is provided.
- FIG. 1 It is a schematic block diagram of the vertical processing furnace of the substrate processing apparatus used suitably by one Embodiment of this invention, and is a figure which shows a processing furnace part with a longitudinal cross-sectional view.
- FIG. 1 It is a schematic block diagram of the controller of the substrate processing apparatus used suitably by one Embodiment of this invention, and is a figure which shows the control system of a controller with a block diagram.
- (A) (b) is a flowchart which shows an example of a pre-processing process, respectively. It is a flowchart which shows an example of the substrate processing process implemented after a pre-processing process. It is a flowchart which shows an example of the temperature control in a substrate processing process.
- (A)-(c) is a flowchart which respectively shows the modification of the temperature control in a substrate processing process. It is a figure which shows the measurement result of the nitrogen concentration contained in the film
- the processing furnace 202 includes a reaction tube 203.
- the reaction tube 203 is made of a heat-resistant material such as quartz (SiO 2 ) or silicon carbide (SiC), and has a gas supply port 203p at the upper end and a cylindrical member having a furnace port (opening) at the lower end.
- a processing chamber 201 is formed in the cylindrical hollow portion of the reaction tube 203.
- the processing chamber 201 is configured to accommodate a plurality of wafers 200 as substrates.
- a seal cap 219 is provided as a lid that can airtightly close the lower end opening of the reaction tube 203.
- the seal cap 219 is made of a nonmetallic material such as quartz, and is formed in a disk shape.
- an O-ring 220 is provided on the upper surface of the seal cap 219 as a seal member that comes into contact with the lower end of the reaction tube 203.
- a rotation mechanism 267 is installed below the seal cap 219.
- a rotation shaft 255 of the rotation mechanism 267 passes through 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.
- a bearing portion 219s of the rotating shaft 255 provided on the rotating shaft 255 is configured as a fluid seal such as a magnetic seal.
- the seal cap 219 is configured to be raised and lowered in the vertical direction by a boat elevator 115 as an elevating mechanism installed outside the reaction tube 203.
- the boat elevator 115 is configured as a transfer mechanism that carries the wafer 200 in and out of the processing chamber 201 by moving the seal cap 219 up and down.
- the boat 217 as a substrate support is configured to support a plurality of, for example, 25 to 200, wafers 200 in a multi-stage manner by aligning them vertically in a horizontal posture and with their centers aligned. It is configured to arrange at intervals.
- the boat 217 is made of a heat-resistant material such as quartz or SiC, and includes a top plate 217a and a bottom plate 217b above and below.
- the heat insulator 218 supported in a multi-stage at a lower position of the boat 217 is made of a heat-resistant material such as quartz or SiC, for example, so as to suppress heat conduction between the wafer accommodation region and the region near the furnace port. It is configured.
- the bottom plate 217b can be provided below the heat insulator 218.
- the heat insulator 218 can also be considered as a part of the components of the boat 217.
- a heater 207 as a heating unit is provided outside the reaction tube 203.
- the heater 207 is vertically installed so as to surround the wafer accommodation area in the processing chamber 201.
- the heater 207 not only heats the wafer 200 accommodated in the wafer accommodating area to a predetermined temperature, but also functions as a liquefaction suppression mechanism that imparts thermal energy to the gas supplied into the processing chamber 201 and suppresses liquefaction thereof. , Or function as an excitation mechanism for activating this gas with heat.
- a temperature sensor 263 as a temperature detection unit is provided in the processing chamber 201 along the inner wall of the reaction tube 203. Based on the temperature information detected by the temperature sensor 263, the output of the heater 207 is adjusted.
- a gas supply pipe 232a is connected to a gas supply port 203p provided at the upper end of the reaction pipe 203.
- the gas supply pipe 232a is provided with a gas generator 250a, a mass flow controller (MFC) 241a that is a flow rate controller (flow rate control unit), and a valve 243a that is an on-off valve in order from the upstream side.
- MFC mass flow controller
- the gas generator 250a vaporizes or mists the hydrogen peroxide solution as a liquid raw material by heating it to a predetermined temperature (vaporization temperature) within a range of 120 to 200 ° C., for example, at approximately atmospheric pressure.
- a predetermined temperature vaporization temperature
- the hydrogen peroxide solution is an aqueous solution obtained by dissolving hydrogen peroxide (H 2 O 2 ), which is liquid at room temperature, in water (H 2 O) as a solvent.
- the gas obtained by vaporizing the hydrogen peroxide solution contains H 2 O 2 and H 2 O at predetermined concentrations.
- this gas is also referred to as H 2 O 2 containing gas.
- a processing gas used in a first reforming process described later is also referred to as a first processing gas
- a processing gas used in a second reforming process described later is also referred to as a second processing gas.
- H 2 O 2 contained in the processing gas is a kind of active oxygen, is unstable, easily releases oxygen (O), and generates a hydroxy radical (OH radical) having a very strong oxidizing power. Therefore, the H 2 O 2 -containing gas acts as a strong oxidant (O source) in the substrate processing step described later.
- a gas supply pipe 232b for supplying a carrier gas (dilution gas) is connected downstream of the valve 243a of the gas supply pipe 232a and upstream of the portion heated by the heater 207.
- the gas supply pipe 232b is provided with an MFC 241b and a valve 243b in order from the upstream side.
- the carrier gas an O-containing gas not containing hydrogen peroxide such as oxygen (O 2 ) gas, an inert gas such as nitrogen (N 2 ) gas or a rare gas, or a mixed gas thereof can be used. .
- the vaporizing carrier gas is supplied to the gas generator 250a together with the hydrogen peroxide solution to atomize the hydrogen peroxide solution (atomizing). )is doing.
- the flow rate of the vaporizing carrier gas is, for example, about 100 to 500 times the flow rate of the hydrogen peroxide solution.
- the vaporizing carrier gas the same gas as the above-described carrier gas (dilution gas) can be used.
- the vaporizing carrier gas or the carrier gas (dilution gas)
- the vaporizing carrier gas or the carrier gas (dilution gas) is changed to the above-mentioned “processing gas”, “H 2 O 2 containing gas”, “ It may be considered to be included in “first processing gas” and “second processing gas”.
- a processing gas supply system is mainly configured by the gas supply pipe 232a, the MFC 241a, and the valve 243a. Also, a carrier gas (dilution gas) supply system is mainly configured by the gas supply pipe 232b, the MFC 241b, and the valve 243b.
- An exhaust pipe 231 for exhausting the atmosphere in the processing chamber 201 is connected to the lower side wall of the reaction tube 203.
- a vacuum pump 246 as a vacuum exhaust device is connected to the exhaust pipe 231 via a pressure sensor 245 as a pressure detector for detecting the pressure in the processing chamber 201 and an APC valve 244 as a pressure regulator.
- the APC valve 244 can perform evacuation and evacuation stop in the processing chamber 201 by opening and closing the valve while the vacuum pump 246 is activated, and further, with the vacuum pump 246 activated,
- the pressure in the processing chamber 201 can be adjusted by adjusting the valve opening based on the pressure information detected by the pressure sensor 245.
- An exhaust system is mainly configured by the exhaust pipe 231, the APC valve 244, and the pressure sensor 245.
- the vacuum pump 246 may be included in the exhaust system.
- the controller 121 as a control unit is configured as a computer including a CPU 121a, a RAM 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 to exchange data with the CPU 121a via the internal bus 121e.
- An input / output device 122 configured as a touch panel or the like is connected to the controller 121.
- the storage device 121c is configured by a flash memory, an HDD, or the like.
- a control program that controls the operation of the substrate processing apparatus, a process recipe that describes the procedure and conditions of the substrate processing described later, and the like are stored in a readable manner.
- the process recipe is a combination of functions so that a predetermined result can be obtained by causing the controller 121 to execute each procedure described later, and functions as a program.
- process recipes, control programs, and the like are collectively referred to simply as programs.
- the process recipe is also simply called a recipe.
- program When the term “program” is used in this specification, it may include only a recipe, only a control program, or both.
- the RAM 121b is configured as a memory area that temporarily stores programs, data, and the like read by the CPU 121a.
- the I / O port 121d includes the above-described MFCs 241a and 241b, valves 243a and 243b, gas generator 250a, pressure sensor 245, APC valve 244, vacuum pump 246, heater 207, temperature sensor 263, rotating mechanism 267, boat elevator 115, and the like. It is connected to the.
- the CPU 121a is configured to read out and execute a control program from the storage device 121c and to read a recipe from the storage device 121c in response to an operation command input from the input / output device 122 or the like.
- the CPU 121a is based on the gas generation operation by the gas generator 250a, the flow rate adjustment operation by the MFCs 241a and 241b, the opening and closing operation of the valves 243a and 243b, the opening and closing operation of the APC valve 244 and the pressure sensor 245 so as to follow the contents of the read recipe.
- the controller 121 installs the above-mentioned program stored in an external storage device (for example, a magnetic disk such as an HDD, an optical disk such as a CD, a magneto-optical disk such as an MO, or a semiconductor memory such as a USB memory) 123 in a computer.
- an external storage device for example, a magnetic disk such as an HDD, an optical disk such as a CD, a magneto-optical disk such as an MO, or a semiconductor memory such as a USB memory
- the storage device 121c and the external storage device 123 are configured as computer-readable recording media. Hereinafter, these are collectively referred to simply as a recording medium.
- recording medium When the term “recording medium” is used in this specification, it may include only the storage device 121c alone, may include only the external storage device 123 alone, or may include both of them.
- the program may be provided to the computer using a communication means such as the Internet or a dedicated line without using the external storage device 123.
- a polysilazane (PHPS) coating step and a pre-baking step are performed on the wafer 200 in this order.
- PHPS polysilazane
- a coating liquid containing polysilazane polysilazane solution
- the solvent is removed from the film by heat-treating the wafer 200 on which the coating film is formed.
- prebake temperature a processing temperature within a range of 70 to 250 ° C.
- the solvent can be volatilized from the coating film. This heat treatment is preferably performed at about 150 ° C.
- the coating film formed on the surface of the wafer 200 becomes a film (polysilazane film) having a silazane bond (—Si—N—) through a pre-bake process.
- this film contains nitrogen (N) and hydrogen (H), and may further contain carbon (C) and other impurities.
- the polysilazane film formed on the wafer 200 is modified (oxidized) by supplying a processing gas containing H 2 O 2 under a predetermined temperature condition.
- the wafer 200 on which a polysilazane film containing a silazane bond is formed is heated to a first temperature, and a first processing gas containing H 2 O 2 is supplied to the wafer 200 to modify the polysilazane film.
- a first reforming step (first step)
- the wafer 200 is heated to a second temperature higher than the first temperature, and a second processing gas containing H 2 O 2 is supplied to the wafer 200 to modify the polysilazane film.
- a second reforming step (second step) To implement.
- a process (3rd process) is implemented.
- a drying process (fourth process) in which the wafer 200 is dried by supplying a carrier gas not containing H 2 O 2 to the wafer 200.
- wafer When the term “wafer” is used in this specification, it may mean the wafer itself or a laminate of the wafer and a predetermined layer or film formed on the surface thereof.
- wafer surface When the term “wafer surface” is used in this specification, it may mean the surface of the wafer itself, or may mean the surface of a predetermined layer or the like formed on the wafer.
- the phrase “form a predetermined layer on the wafer” means that the predetermined layer is directly formed on the surface of the wafer itself, a layer formed on the wafer, etc. It may mean that a predetermined layer is formed on the substrate.
- substrate is also synonymous with the term “wafer”.
- Substrate loading process A plurality of wafers 200 having a polysilazane film formed on the surface are loaded into the boat 217 (wafer charge). Thereafter, as shown in FIG. 1, the boat 217 that supports the plurality of wafers 200 is lifted by the boat elevator 115 and loaded into the processing chamber 201 (boat loading). In this state, the seal cap 219 seals the lower end of the reaction tube 203 via the O-ring 220.
- the inside of the processing chamber 201 is evacuated by the vacuum pump 246 so that the space in which the wafer 200 exists, that is, the space where the wafer 200 exists becomes a predetermined pressure (reforming pressure). At this time, the pressure in the processing chamber 201 is measured by the pressure sensor 245, and the APC valve 244 is feedback-controlled based on the measured pressure information. Further, the heater 207 is heated so that the temperature of the wafer 200 becomes a predetermined temperature (first temperature). At this time, the state of energization to the heater 207 is feedback-controlled based on the temperature information detected by the temperature sensor 263 so that the wafer 200 has a predetermined temperature.
- the feedback control of the heater 207 is continuously performed at least until the processing on the wafer 200 is completed. Further, the rotation of the wafer 200 by the rotation mechanism 267 is started. The operation of the vacuum pump 246 and the heating and rotation of the wafer 200 are all continued until the processing on the wafer 200 is completed.
- the first processing gas is diluted with O 2 gas in the gas supply pipe 232a and is supplied into the processing chamber 201 in this state.
- the H 2 O 2 concentration (the partial pressure of H 2 O 2 in the processing chamber 201) of the first processing gas by supplying the O 2 gas, liquefaction of the first processing gas supplied into the processing chamber 201 is achieved. That is, it becomes possible to suppress the liquefaction of the H 2 O 2 component contained in the first processing gas or to adjust the modification rate of the polysilazane film.
- the H 2 O 2 concentration of the first processing gas may be adjusted by changing the flow rate of the vaporizing carrier gas supplied to the gas generator 250a or the flow rate of the liquid raw material.
- processing conditions in the first reforming step include the following.
- H 2 O 2 concentration of liquid raw material 20 to 40%, preferably 25 to 35%
- Liquid raw material flow rate 1.0 to 10 sccm, preferably 1.6 to 8 sccm
- Liquid raw material vaporization conditions Heated to 120 to 200 ° C. at approximately atmospheric pressure Reforming pressure: 700 to 1000 hPa (any of atmospheric pressure, slightly reduced pressure, and slightly increased pressure)
- the partial pressure of H 2 O 2 is preferably as close as possible to the saturated vapor pressure.
- the first processing gas is supplied to the wafer 200 under the above-described conditions, and this state is maintained for a predetermined first time (for example, a time within a range of 20 to 720 minutes), thereby forming the wafer 200 on the wafer 200.
- the polysilazane film can be modified (oxidized). That is, the O component contained in the first processing gas can be added to the polysilazane film, and impurities (first impurities) such as the N component, C component, and H component contained in the polysilazane film are removed from this film. Can be separated.
- H 2 O 2 contained in the first processing gas has a very strong oxidizing power as described above. Therefore, even when the first temperature is set to the above-described low temperature condition, the oxidation treatment for the polysilazane film can proceed at a practical rate. Further, by setting the first temperature to the above-described low temperature condition, it is possible to suppress the curing (condensation) of the surface of the polysilazane film by performing the first modification step. For this reason, in the first reforming step, the H 2 O 2 component and the H 2 O component contained in the first processing gas are not only in the surface of the polysilazane film but also in the film (in the thickness direction). Infiltration.
- the above-described modification effect can be obtained not only on the surface of the film but also in the deep portion.
- the first modification step is performed at least over the entire thickness direction of the polysilazane film, that is, the H 2 O 2 component reaches the deep part of the film. It is preferable to continue to do so. It is preferable to increase the implementation period (first time) of the first reforming step as the thickness of the polysilazane film increases. Further, the time until the modification effect in the first treatment step reaches the entire thickness direction of the polysilazane film is generally longer than the time until the modification effect in the second modification step described later is completed. For example, it is preferable that the implementation period (first time) of the first reforming process is equal to or longer than the implementation period (second time) of the second reforming process.
- the first process gas containing H 2 O 2 is liable to be liquefied particularly under the atmospheric pressure (or slightly reduced pressure or slightly increased pressure) condition as in the present embodiment. Particles resulting from liquefaction are generated, uniform oxidation treatment within the wafer surface or between the wafers cannot be performed, or liquefied high-concentration H 2 O 2 -containing liquid stays around the furnace port of the reaction tube 203 There is a case.
- the temperature of the wafer 200 By setting the temperature of the wafer 200 to a predetermined temperature of 70 ° C. or higher, the oxidation process can proceed while suppressing the liquefaction of the first process gas under the pressure condition as in the present embodiment.
- the temperature of the wafer 200 may be set to less than 70 ° C.
- the temperature of the wafer 200 is 300 ° C. or higher, the surface of the polysilazane film is hardened, and it may be difficult to infiltrate the H 2 O 2 component or the H 2 O component into the film.
- the temperature of the wafer 200 By setting the temperature of the wafer 200 to a predetermined temperature lower than 300 ° C., curing of the surface of the polysilazane film can be suppressed, the H 2 O 2 component and the H 2 O component are permeated into the film, and the thickness of the film A modification effect can be obtained over the entire length direction.
- the valve 243a is closed, the supply of the first processing gas to the wafer 200 is stopped, and the temperature of the wafer 200 is changed from the first temperature. To a higher second temperature. If the O 2 gas is supplied from the gas supply pipe 232b in the first reforming step, the valve 243b is kept open until the next second reforming step is started, and the supply of the O 2 gas is continued. May be. Alternatively, the supply of O 2 gas into the processing chamber 201 may be stopped by closing the valve 243b simultaneously with the stop of the supply of the first processing gas or after a predetermined time has elapsed.
- the liquefaction of the second processing gas supplied into the processing chamber 201 That is, it becomes possible to suppress the liquefaction of the H 2 O 2 component contained in the second processing gas or to adjust the modification rate of the polysilazane film.
- the H 2 O 2 concentration of the second processing gas may be adjusted by changing the flow rate of the vaporizing carrier gas supplied to the gas generator 250a or the flow rate of the liquid raw material.
- the temperature in the processing chamber 201 is set to the second temperature higher than the first temperature, even if the H 2 O 2 concentration of the second processing gas is higher than that of the first processing gas. The liquefaction of the second process gas is less likely to occur.
- processing conditions in the second reforming step include the following.
- H 2 O 2 concentration of liquid raw material 20 to 40%, preferably 25 to 35%
- Liquid raw material flow rate 1.0 to 10 sccm, preferably 1.6 to 8 sccm
- Liquid raw material vaporization conditions Heated to 120 to 200 ° C. at approximately atmospheric pressure Reforming pressure: 700 to 1000 hPa (any of atmospheric pressure, slightly reduced pressure, and slightly increased pressure)
- the second temperature in order to reliably obtain the effect of the reforming process in this step, it is preferable to set the second temperature to a temperature that is 100 ° C. higher than the first temperature.
- the second temperature is preferably 500 ° C. or lower.
- the concentration of H 2 O 2 of the second processing gas preferably with H 2 O 2 greater than the concentration concentration of the first processing gas.
- the H 2 O 2 concentration of the second processing gas is stored in the wafer 200 in which the partial pressure of H 2 O 2 in the processing chamber 201 is heated to the second temperature.
- the concentration is set to a pressure equal to or lower than the saturated vapor pressure of H 2 O 2 in the processing chamber 201.
- the saturated vapor pressure of H 2 O 2 in the processing chamber 201 is set higher than that in the first reforming step by setting the second temperature to be higher than the first temperature. be able to. Therefore, even if the H 2 O 2 concentration of the second processing gas is higher than that of the first processing gas, the reforming process is performed without the second processing gas containing H 2 O 2 being liquefied in the processing chamber 201. It can be performed.
- the second processing gas is supplied to the wafer 200 under the above-described conditions, and this state is maintained for a predetermined second time (a time shorter than the first time, for example, within a range of 5 to 180 minutes).
- This makes it possible to further modify (oxidize) the film that has been modified in the first modification step.
- an O component can be further added to the film that has been modified in the first reforming step, and is included in the polysilazane film that was difficult to remove by performing the first reforming step.
- Impurities (second impurities) such as N component, C component, and H component can be desorbed from this film.
- the action of oxidation obtained in this step is stronger than that obtained in the first reforming step. It becomes possible. Further, as described above, by performing the second reforming step under the second temperature condition higher than the first temperature, it is possible to suppress liquefaction of the second process gas. Therefore, in the present embodiment, a gas having a higher H 2 O 2 concentration than the first processing gas can be used as the second processing gas, thereby making it possible to further enhance the action of oxidation. Become.
- the second reforming step is performed under a second temperature condition higher than the first temperature
- H 2 O that has been permeated into the film when the first reforming step is performed. 2 or the like can be contributed to the oxidation treatment under a higher temperature condition.
- heating the wafer 200 to the second temperature activates H 2 O 2 , H 2 O and the like that have penetrated into the film to modify (oxidize) the film
- the second impurity, which has been difficult to remove by performing the first reforming step can be desorbed from the film.
- the above-described modification effect can be obtained over the entire region in the thickness direction of the film (up to the deep part of the film).
- the surface of the polysilazane film is cured by performing the first reforming step under a first temperature condition lower than the second temperature (particularly less than 300 ° C.).
- H 2 O 2 , H 2 O or the like is efficiently infiltrated into the film while suppressing the above.
- the component such as H 2 O 2 that has permeated in the first reforming step has an action of promoting the penetration of the component such as H 2 O 2 into the membrane also in the second reforming step.
- components such as H 2 O 2 are also contained in the film in the second reforming step performed under a second temperature condition higher than the first temperature (particularly, 300 ° C. or more at which the surface of the polysilazane film is easily cured). It becomes easy to permeate, and it becomes possible to obtain a modification effect by components such as H 2 O 2 over the entire thickness direction of the film (up to the deep part of the film).
- the temperature rise between the second reforming process and the drying process is omitted, and the time from the end of the second reforming process to the start of the drying process is reduced.
- the inside of the processing chamber 201 is evacuated. Thereafter, N 2 gas is supplied into the processing chamber 201 to return the inside to atmospheric pressure, and the heat capacity in the processing chamber 201 is increased.
- the wafer 200 and the members in the processing chamber 201 can be heated uniformly, and particles, impurities, outgas, and the like that could not be removed by evacuation can be removed from the processing chamber 201.
- the inside of the processing chamber 201 is lowered to a predetermined unloadable temperature.
- the seal cap 219 is lowered by the boat elevator 115 and the lower end of the reaction tube 203 is opened. Then, the processed wafer 200 is unloaded from the lower end of the reaction tube 203 to the outside of the reaction tube 203 while being supported by the boat 217. The processed wafer 200 is taken out of the reaction tube 203 and then taken out from the boat 217 (wafer discharge).
- the treatment temperature is set to the above-described low temperature condition, thereby suppressing the curing of the surface of the polysilazane film by performing the first reforming step, and the H 2 O 2 component is introduced into the film. And H 2 O component can be permeated. As a result, the effect of modification can be spread to the deep part of the film.
- the H 2 O 2 component and the H 2 O component that have been infiltrated into the film are obtained by setting the treatment temperature to a second temperature that is, for example, 100 ° C. higher than the first temperature. It can be activated to contribute to the film modification (oxidation) treatment, and the above-described modification action can be obtained over the entire thickness direction of the film.
- the polysilazane film formed on the wafer 200 is converted into a high-quality SiO film having an extremely low impurity concentration over the entire thickness direction of the film. It can be changed.
- this embodiment It is difficult to obtain the same effect. Also, when the second reforming step is performed prior to the first reforming step, it is difficult to obtain the same effect as in the present embodiment. This is because, if the second modification step performed under the second temperature condition is performed first, the curing of the surface of the polysilazane film proceeds from the beginning, and then the H 2 O 2 component and the H 2 O component are introduced into the film. This is considered to be difficult to permeate.
- the temperature of the wafer 200 is not limited to the case where the temperature of the wafer 200 is raised to the first temperature and kept constant, but the temperature of the wafer 200 is within the above range (70 You may make it fluctuate by more than 300 degreeC.
- the temperature of the wafer 200 is not limited to the case where the temperature of the wafer 200 is raised to the second temperature and kept constant, but the temperature of the wafer 200 is within the above range. It may be varied at (300 to 500 ° C.).
- the temperature of the wafer 200 may be varied in each of the first and second reforming steps.
- each of the first temperature and the second temperature can be considered as a temperature zone having a predetermined width.
- the temperature raising step may be omitted.
- the temperature of the wafer 200 during the drying process may be varied.
- a temperature rising rate may be fixed and may be changed.
- the temperature may be lowered.
- the temperature lowering rate may be constant or may be changed.
- 1st temperature and 2nd temperature you may make it perform temperature rising and temperature falling alternately.
- Modification 2 In at least one of the first reforming process and the second reforming process, when the processing gas is supplied into the processing chamber 201, the APC valve 244 is closed or the opening degree thereof is reduced, thereby reducing the processing chamber.
- the processing gas may be contained in 201 and the inside of the processing chamber 201 may be in a pressurized state. Thereby, the concentration distribution of the processing gas in the processing chamber 201 can be made uniform, and the uniformity of the modification processing between the wafers 200 and in the surface of the wafer 200 can be improved.
- pressurizing the inside of the processing chamber 201 the above-described oxidation reaction can be promoted and the quality of the SiO film can be improved. In addition, it is possible to shorten the time required for the oxidation treatment and improve productivity.
- O 2 gas Before starting the supply of the first processing gas into the processing chamber 201, O 2 gas may be flowed from the gas supply pipe 232b, and the inside of the processing chamber 201 may be preliminarily set to an O 2 gas atmosphere. As a result, it becomes possible to increase the productivity of the above-described modification treatment and improve the quality of the SiO film. In addition, it is possible to improve the uniformity of the modification process between the wafers 200 and within the wafer 200 surface, and to suppress the generation of foreign substances in the process chamber 201.
- the impurities contained in the processing gas are derived from stabilizers and impurities contained in the liquid raw material used for generating the first processing gas.
- the H 2 O 2 -containing gas may be supplied to the wafer 200 while the temperature of the wafer 200 is raised from the first temperature to the second temperature.
- the H 2 O 2 -containing gas supplied here may be one that continuously supplies the first processing gas in the first reforming step, or is switched to the second processing gas in the second reforming step. It may be. Further, the first processing gas may be switched to the second processing gas during the temperature raising step. Further, the H 2 O 2 concentration of the first processing gas may be changed gradually (or stepwise) so as to become the concentration in the second processing gas. However, when the concentration of the H 2 O 2 -containing gas generated in the gas generator 250a is changed, a predetermined time is required until the gas concentration is stabilized.
- the gas concentration is not supplied until the gas concentration is stabilized, without supplying the H 2 O 2 -containing gas into the processing chamber 201. It is desirable to start the supply of the second processing gas into the processing chamber 201 after the temperature has stabilized.
- the processing gas may be generated outside the processing chamber 201.
- the processing gas may be generated inside the processing chamber 201.
- the liquid source may be supplied to the top plate 217a heated by a lamp heater or the like, and the process gas may be generated by vaporizing the liquid source.
- the present invention is not limited to this.
- FIG. 3B even when a polysilazane film formed by Flowable CVD method and not pre-baked is processed, the same effect as the above-described embodiment can be obtained.
- a film is formed using a batch-type substrate processing apparatus that processes a plurality of substrates at one time.
- the present invention is not limited to the above-described embodiment, and can be applied, for example, when a film is formed using a single-wafer type substrate processing apparatus that processes one or several substrates at a time.
- a film is formed using a substrate processing apparatus having a hot wall type processing furnace has been described.
- the present invention is not limited to the above-described embodiment, and can also be applied to the case where a film is formed using a substrate processing apparatus having a cold wall type processing furnace.
- processing procedure and processing conditions at this time can be the same processing procedure and processing conditions as in the above-described embodiment, for example.
- the polysilazane film formed on the wafer was modified using the substrate processing apparatus shown in FIG.
- the processing time of the first reforming process is the same as the total execution time of the first reforming process and the second reforming process in the above-described embodiment, and the time for performing the reforming process with the H 2 O 2 -containing gas is the same. It was made to become.
- O 2 gas was used as the carrier gas, and the processing conditions in each step other than the second reforming step were set to predetermined conditions within the processing condition range described in the above embodiment.
- the polysilazane film formed on the wafer was modified using the substrate processing apparatus shown in FIG.
- the processing time of the second reforming process is the same as the total execution time of the first reforming process and the second reforming process in the above-described embodiment, and the time for performing the reforming process with the H 2 O 2 -containing gas is the same. It was made to become.
- O 2 gas was used as the carrier gas, and the processing conditions in each step other than the first reforming step were set to predetermined conditions within the processing condition range described in the above embodiment.
- the substrate processing apparatus shown in FIG. 1 As the sample 3, it is formed on the wafer by performing the same processing procedure as that of the above-described embodiment, that is, by performing the first modification process and the second modification process in this order.
- the resulting polysilazane film was modified.
- O 2 gas was used as the carrier gas, and the processing conditions in each step were set to predetermined conditions within the processing condition range described in the above-described embodiment.
- FIG. 7 shows the evaluation results.
- the vertical axis in FIG. 7 indicates the N concentration (atomic%) in the film, and the horizontal axis indicates the depth (nm) from the surface of the film.
- the N concentration in the film of Sample 3 can be significantly reduced over the entire thickness direction of the film as compared with the films of Samples 1 and 2. That is, by performing the first modification step and the second modification step in this order, the polysilazane film formed on the wafer is changed to a high-quality SiO film having an extremely low impurity concentration over the entire thickness direction of the film. It turns out that it becomes possible.
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Abstract
Description
シラザン結合を含有する膜が表面に形成された基板を第1温度に加熱し、前記基板に対して過酸化水素を含有する第1処理ガスを供給することにより、前記シラザン結合を含有する膜を改質する第1工程と、
前記第1工程の後、前記基板を前記第1温度よりも高い第2温度に加熱し、前記基板に対して過酸化水素を含有する第2処理ガスを供給することにより、前記シラザン結合を含有する膜を改質する第2工程と、
を有する技術が提供される。
以下、本発明の一実施形態について、図1~2、図3(a)、図4~5を用いて説明する。
図1に示すように、処理炉202は反応管203を備えている。反応管203は、例えば石英(SiO2)や炭化シリコン(SiC)等の耐熱性材料により構成され、上端にガス供給ポート203pを有し、下端に炉口(開口)を有する円筒部材として構成されている。反応管203の筒中空部には、処理室201が形成される。処理室201は、複数枚の基板としてのウエハ200を収容可能に構成されている。
ここで、ウエハ200に対して基板処理工程を実施する前に行われる事前処理工程について、図3(a)を用いて説明する。
続いて、上述の基板処理装置を用い、半導体装置の製造工程の一工程として実施される基板処理工程の一例について、図4、図5を用いて説明する。以下の説明において、基板処理装置を構成する各部の動作は、コントローラ121により制御される。
シラザン結合を含有するポリシラザン膜が表面に形成されたウエハ200を第1温度に加熱し、ウエハ200に対してH2O2を含有する第1処理ガスを供給することにより、ポリシラザン膜を改質する第1改質工程(第1工程)と、
第1改質工程の後、ウエハ200を第1温度よりも高い第2温度に加熱し、ウエハ200に対してH2O2を含有する第2処理ガスを供給することにより、ポリシラザン膜を改質する第2改質工程(第2工程)と、
を実施する。
表面にポリシラザン膜が形成された複数枚のウエハ200が、ボート217に装填(ウエハチャージ)される。その後、図1に示すように、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内へ搬入(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の下端をシールした状態となる。
処理室201内、すなわち、ウエハ200が存在する空間が所定の圧力(改質圧力)となるように、真空ポンプ246によって処理室201内が真空排気される。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244がフィードバック制御される。また、ウエハ200の温度が所定の温度(第1温度)となるように、ヒータ207によって加熱される。この際、ウエハ200が所定の温度となるように、温度センサ263が検出した温度情報に基づいてヒータ207への通電具合がフィードバック制御される。ヒータ207のフィードバック制御は、少なくともウエハ200に対する処理が終了するまでの間は継続して行われる。また、回転機構267によるウエハ200の回転を開始する。真空ポンプ246の稼働、ウエハ200の加熱および回転は、いずれも、ウエハ200に対する処理が終了するまでの間は継続して行われる。
続いて、バルブ243aを開き、MFC241a、ガス供給管232a、ガス供給ポート203pを介した処理室201内へのH2O2含有ガス(第1処理ガス)の供給を開始する。処理室201内へ供給された第1処理ガスは、処理室201内の下方に向かって流れ、排気管231を介して処理室201の外部へ排出される。このとき、ウエハ200に対して第1処理ガスが供給される。このとき、バルブ243bを開き、MFC241bにより流量調整しながら、ガス供給管232a、ガス供給ポート203pを介した処理室201内へのキャリアガス(O2ガス)の供給を行うようにしてもよい。この場合、第1処理ガスは、ガス供給管232a内にてO2ガスによって希釈され、その状態で処理室201内へ供給される。O2ガスの供給によって第1処理ガスのH2O2濃度(処理室201内におけるH2O2の分圧)を調整することで、処理室201内へ供給された第1処理ガスの液化、すなわち、第1処理ガスに含まれるH2O2成分の液化を抑制したり、ポリシラザン膜の改質レートを調整したりすることが可能となる。第1処理ガスのH2O2濃度は、ガス発生器250aに供給する気化用キャリアガスの流量や液体原料の流量を変えることで調整してもよい。
液体原料のH2O2濃度:20~40%、好ましくは25~35%
液体原料の流量:1.0~10sccm、好ましくは1.6~8sccm
液体原料の気化条件:略大気圧下で120~200℃に加熱
改質圧力:700~1000hPa(大気圧、微減圧および微加圧のうちいずれか)
ウエハ200の温度(第1温度):70℃以上300℃未満
O2ガス(気化用キャリアガス及びキャリアガス(希釈用ガス))の全流量:0~20SLM、好ましくは5~10SLM
所定時間が経過し、第1温度条件下でのポリシラザン膜の改質処理が終了したら、バルブ243aを閉じ、ウエハ200に対する第1処理ガスの供給を停止し、ウエハ200の温度を第1温度よりも高い第2温度へと昇温させる。なお、第1改質工程でガス供給管232bからO2ガスを供給していた場合、次の第2改質工程を開始するまでバルブ243bを開いたままとし、O2ガスの供給を継続してもよい。また、第1処理ガスの供給停止と同時或いは所定時間経過後にバルブ243bを閉じ、処理室201内へのO2ガスの供給を停止してもよい。
ウエハ200の温度が第1温度よりも高い第2温度に到達して安定したら、第1改質工程と同様の処理手順により、ウエハ200に対するH2O2含有ガス(第2処理ガス)の供給を開始する。本工程においても、第1改質工程と同様に、処理室201内へのO2ガスの供給を行うようにしてもよい。O2ガスの供給によって第2処理ガスのH2O2濃度(処理室201内におけるH2O2の分圧)を調整することで、処理室201内へ供給された第2処理ガスの液化、すなわち、第2処理ガスに含まれるH2O2成分の液化を抑制したり、ポリシラザン膜の改質レートを調整したりすることが可能となる。第2処理ガスのH2O2濃度は、ガス発生器250aに供給する気化用キャリアガスの流量や液体原料の流量を変えることで調整してもよい。ただし、本工程では、処理室201内の温度を第1温度よりも高い第2温度とすることから、第2処理ガスのH2O2濃度を第1処理ガスのそれよりも高くしたとしても、第2処理ガスの液化は生じにくくなる。
液体原料のH2O2濃度:20~40%、好ましくは25~35%
液体原料の流量:1.0~10sccm、好ましくは1.6~8sccm
液体原料の気化条件:略大気圧下で120~200℃に加熱
改質圧力:700~1000hPa(大気圧、微減圧および微加圧のうちいずれか)
ウエハ200の温度(第2温度):300~500℃
O2ガス(気化用キャリアガス及びキャリアガス(希釈用ガス))の全流量:0~20SLM、好ましくは5~10SLM
所定時間が経過し、第2温度条件下で行う膜の改質処理が終了したら、ウエハ200に対する第2処理ガスの供給を停止する。そして、ウエハ200に対してH2O2非含有のO2ガスを供給することにより、ウエハ200を乾燥させる。この工程は、ウエハ200の温度を上述の第2温度に維持した状態、または上述の第2温度より高い温度とした状態で実行するのが好ましい。これにより、ウエハ200の乾燥を促進させることが可能となる。すなわち、第2改質工程を行うことで改質された膜の表面や膜中から、H2O2成分やH2O成分を効率的に脱離させることが可能となる。また、乾燥工程を第2温度に維持した状態で実行することで、第2改質工程と乾燥工程との間の昇温を省略し、第2改質工程終了から乾燥工程開始までの時間を短縮することができるとともに、膜中に残存したH2O2やH2O等の成分による改質効果を、乾燥工程においても得ることが可能となる。
乾燥工程が終了した後、処理室201内を真空排気する。その後、処理室201内へN2ガスを供給してその内部を大気圧に復帰させ、処理室201内の熱容量を増加させる。これにより、ウエハ200や処理室201内の部材を均一に加熱することができ、真空排気で除去できなかったパーティクル、不純物、アウトガス等を処理室201内から除去することが可能となる。所定時間経過した後、処理室201内を所定の搬出可能温度に降温させる。
ボートエレベータ115によりシールキャップ219が下降され、反応管203の下端が開口される。そして、処理済のウエハ200が、ボート217に支持された状態で、反応管203の下端から反応管203の外部に搬出(ボートアンロード)される。処理済のウエハ200は、反応管203の外部に搬出された後、ボート217より取り出される(ウエハディスチャージ)。
本実施形態によれば、以下に示す1つ又は複数の効果が得られる。
本実施形態は、以下の変形例のように変更することができる。また、これらの変形例は、任意に組み合わせることもできる。
図6(a)に示すように、第1改質工程では、ウエハ200の温度を第1温度に昇温させて一定に維持する場合に限らず、ウエハ200の温度を上述の範囲内(70℃以上300℃未満)で変動させてもよい。また、図6(b)に示すように、第2改質工程では、ウエハ200の温度を第2温度に昇温させて一定に維持する場合に限らず、ウエハ200の温度を上述の範囲内(300~500℃)で変動させてもよい。また、図6(c)に示すように、第1改質工程、第2改質工程のそれぞれにおいて、ウエハ200の温度を変動させてもよい。すなわち、第1温度、第2温度は、それぞれ、所定の幅を有する温度帯として考えることができる。なお、これらの変形例においては、昇温工程を不実施としてもよい。また、乾燥工程を行う際のウエハ200の温度を変動させてもよい。なお、第1温度、第2温度を変動させる場合、図示したように昇温させてもよく、この場合、昇温レートを一定としてもよく、変化させてもよい。また、第1温度、第2温度を変動させる場合、降温させてもよく、この場合、降温レートを一定としてもよく、変化させてもよい。また、第1温度、第2温度を変動させる場合、昇温と降温とを交互に行うようにしてもよい。
第1改質工程、第2改質工程のうち少なくともいずれかの工程では、処理室201内へ処理ガスを供給する際、APCバルブ244を閉じるか、その開度を小さくすることで、処理室201内に処理ガスを封じ込め、処理室201内を加圧状態としてもよい。これにより、処理室201内における処理ガスの濃度分布を均一化させることができ、ウエハ200間およびウエハ200面内における改質処理の均一性をそれぞれ向上させることが可能となる。また、処理室201内を加圧することで、上述の酸化反応を促進させ、SiO膜の膜質を向上させることも可能となる。また、酸化処理に要する時間を短縮させ、生産性を向上させることも可能となる。
処理室201内への第1処理ガスの供給を開始する前に、ガス供給管232bからO2ガスを流し、処理室201内を予めO2ガス雰囲気としてもよい。これにより、上述の改質処理の生産性を高めたり、SiO膜の膜質を向上させたりすることが可能となる。また、ウエハ200間およびウエハ200面内における改質処理の均一性をそれぞれ向上させたり、処理室201内における異物の発生を抑制したりすることも可能となる。というのも、処理室201内をO2ガス雰囲気とすることなく第1処理ガスの供給を開始すると、ウエハ収容領域の上方と下方とで、また、ウエハ200の周縁部と中央部とで、改質処理の開始タイミングの差が大きくなる場合がある。また、第1処理ガスに含まれる不純物と、ポリシラザン膜中に残留している溶剤や不純物と、が過剰に反応して異物を発生させる場合もある。処理室201内を予めO2ガス雰囲気としておくことで、これらの課題を解消することが可能となる。なお、処理ガスに含まれる不純物とは、第1処理ガスの生成に用いられる液体原料に含まれていた安定剤や不純物に由来するものである。
昇温工程では、ウエハ200の温度を第1温度から第2温度へと昇温させる間、ウエハ200に対してH2O2含有ガスを供給してもよい。ここで供給されるH2O2含有ガスは、第1改質工程における第1処理ガスを継続して供給するものであってもよく、第2改質工程における第2処理ガスに切り替えたものであってもよい。また、昇温工程の途中で第1処理ガスから第2処理ガスに切り替えたものであってもよい。また、第1処理ガスのH2O2濃度を徐々に(または段階的に)第2処理ガスにおける濃度となるように変化させたものであってもよい。ただし、ガス発生器250aにおいて発生させるH2O2含有ガスの濃度を変化させる場合、ガス濃度を安定させるまでには所定の時間が必要となる。そのため、第1処理ガスを濃度の異なる第2処理ガスに切り替える際等には、ガス濃度が安定するまでの間、処理室201内へのH2O2含有ガスの供給を行わず、ガス濃度が安定してから処理室201内への第2処理ガスの供給を開始することが望ましい。
以上、本発明の実施形態を具体的に説明したが、本発明は上述の実施形態に限定されるものではなく、その要旨を逸脱しない範囲で種々変更可能である。
201 処理室
Claims (16)
- シラザン結合を含有する膜が表面に形成された基板を第1温度に加熱し、前記基板に対して過酸化水素を含有する第1処理ガスを供給することにより、前記シラザン結合を含有する膜を改質する第1工程と、
前記第1工程の後、前記基板を前記第1温度よりも高い第2温度に加熱し、前記基板に対して過酸化水素を含有する第2処理ガスを供給することにより、前記シラザン結合を含有する膜を改質する第2工程と、
を有する半導体装置の製造方法。 - 前記シラザン結合を含有する膜はポリシラザンにより構成されている請求項1に記載の半導体装置の製造方法。
- 前記第1工程では、前記基板を前記第1温度に加熱した状態で所定時間維持する請求項1に記載の半導体装置の製造方法。
- 前記第2工程では、前記基板を前記第2温度に加熱した状態で所定時間維持する請求項1に記載の半導体装置の製造方法。
- 前記第1工程の実施期間を、前記第2工程の実施期間と同等、或いは、それを超える長さとする請求項1に記載の半導体装置の製造方法。
- 前記第1工程を、少なくとも、前記シラザン結合を含有する膜の厚さ方向全域にわたって該膜中に過酸化水素を浸透させるまで実施する請求項1に記載の半導体装置の製造方法。
- 前記第2処理ガスとして、前記第1処理ガスよりも過酸化水素の濃度が高いガスを用いる請求項1に記載の半導体装置の製造方法。
- 前記第1工程と前記第2工程との間に、前記基板に対する過酸化水素を含有するガスの供給を不実施とする第3工程を有する請求項1に記載の半導体装置の製造方法。
- 前記第3工程では、前記基板に対して過酸化水素非含有の酸素含有ガスを供給する請求項8に記載の半導体装置の製造方法。
- 前記第1温度を70℃以上300℃未満の範囲内の所定の温度とする請求項1に記載の半導体装置の製造方法。
- 前記第2温度を300℃以上500℃以下の範囲内の所定の温度とする請求項1に記載の半導体装置の製造方法。
- 前記第2温度を前記第1温度よりも100℃以上高い所定の温度とする請求項1に記載の半導体装置の製造方法。
- 前記第2工程の後、前記基板に対して過酸化水素非含有の酸素含有ガスを供給することにより前記基板を乾燥させる第4工程を有する請求項1に記載の半導体装置の製造方法。
- 前記第4工程を、前記基板の温度を前記第2温度に維持した状態で実行する請求項13に記載の半導体装置の製造方法。
- 基板を収容する処理室と、
前記処理室内の基板を加熱する加熱部と、
前記処理室内へ過酸化水素を含有する第1処理ガスおよび過酸化水素を含有する第2処理ガスを供給するガス供給系と、
シラザン結合を含有する膜が表面に形成された基板を第1温度に加熱して、前記基板に対して前記第1処理ガスを供給することにより、前記シラザン結合を含有する膜を改質する第1処理と、前記第1処理の後、前記基板を前記第1温度よりも高い第2温度に加熱して、前記基板に対して前記第2処理ガスを供給することにより、前記シラザン結合を含有する膜を改質する第2処理と、を実行させるように、前記加熱部および前記ガス供給系を制御するよう構成される制御部と、
を有する基板処理装置。 - 基板処理装置の処理室内において、
シラザン結合を含有する膜が表面に形成された基板を第1温度に加熱し、前記基板に対して過酸化水素を含有する第1処理ガスを供給することにより、前記シラザン結合を含有する膜を改質する第1手順と、
前記第1手順の後、前記基板を前記第1温度よりも高い第2温度に加熱し、前記基板に対して過酸化水素を含有する第2処理ガスを供給することにより、前記シラザン結合を含有する膜を改質する第2手順と、
をコンピュータによって前記基板処理装置に実行させるプログラム。
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