WO2021039270A1 - 半導体装置の製造方法および製造装置 - Google Patents
半導体装置の製造方法および製造装置 Download PDFInfo
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- WO2021039270A1 WO2021039270A1 PCT/JP2020/029324 JP2020029324W WO2021039270A1 WO 2021039270 A1 WO2021039270 A1 WO 2021039270A1 JP 2020029324 W JP2020029324 W JP 2020029324W WO 2021039270 A1 WO2021039270 A1 WO 2021039270A1
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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
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67098—Apparatus for thermal treatment
- H01L21/67103—Apparatus for thermal treatment mainly by conduction
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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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- 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
- C23C16/463—Cooling of the substrate
- C23C16/466—Cooling of the substrate using thermal contact gas
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
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- H—ELECTRICITY
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
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- H01L21/67115—Apparatus for thermal treatment mainly by radiation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01L21/67005—Apparatus not specifically provided for elsewhere
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- H—ELECTRICITY
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- 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
Definitions
- the present disclosure relates to a method for manufacturing a semiconductor device and the manufacturing device.
- a vertical substrate processing device (hereinafter, “vertical type”) is used as a device for processing a semiconductor wafer (hereinafter, also simply referred to as a wafer) which is an object to be processed containing a semiconductor. (Also referred to as “device”) may be used.
- a substrate holder boat
- quartz reaction vessel hereinafter, also referred to as "quartz reaction tube”
- the wafer may be heated to a predetermined temperature for processing by radiating a radiant wave from the heater and causing the radiant wave transmitted through the quartz reaction tube to reach the wafer (for example, Patent Document). 1).
- the wavelength of the radiant wave from the heater, the wavelength transmitted through the quartz reaction tube, and the wavelength absorbed by the object to be processed (wafer) are different from each other. Processing may not be performed efficiently and appropriately.
- the present disclosure provides a technique that enables efficient and appropriate processing of an object to be processed.
- a reaction vessel in which a workpiece containing a semiconductor is placed inside, The heating part that generates heat and A radiation control body arranged between the reaction vessel and the heating unit is provided.
- the radiation control body is provided with a technique for radiating radiant waves in a wavelength band different from the radiant heat from the heating unit to the reaction vessel.
- the substrate processing apparatus given as an example in the following embodiment is used in the manufacturing process of a semiconductor apparatus, and is a vertical substrate processing apparatus that collectively processes a plurality of semiconductor substrates, which are objects to be processed, including semiconductors. It is configured.
- the semiconductor substrate (wafer) to be the object to be processed containing the semiconductor include a semiconductor wafer in which a semiconductor integrated circuit device is built, a semiconductor package, and the like.
- 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 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”.
- the processing performed by the substrate processing apparatus on the wafer may be any processing performed by heating the wafer to a predetermined temperature, for example, for oxidation treatment, diffusion treatment, carrier activation and flattening after ion implantation. Reflow, annealing, film formation treatment, etc. In this embodiment, a case where a film forming process is performed is taken as an example.
- an apparatus for manufacturing a semiconductor apparatus may be referred to as a semiconductor manufacturing apparatus which is a kind of substrate processing apparatus.
- the semiconductor manufacturing apparatus 1 shown in FIG. 1 includes a process tube 10 as a vertical reaction tube.
- the process tube 10 is formed in a cylindrical shape in which the upper end is closed and the lower end is opened , for example, by quartz (SiO 2 ) which is a heat-resistant material.
- the process tube 10 may have a double tube structure having an inner tube (inner tube) and an outer tube (outer tube).
- a processing chamber 11 for processing the wafer 2 is formed inside the process tube 10 (that is, inside the cylindrical shape).
- the processing chamber 11 is configured to accommodate wafers 2 supported by a boat 12, which will be described later, in a state of being arranged in multiple stages in the vertical direction. Further, a furnace port 13 for taking in and out the boat 12 is configured in the lower end opening of the process tube 10.
- a lower chamber (load lock chamber) 14 constituting a load lock chamber for wafer transfer is arranged below the process tube 10.
- the lower chamber 14 is made of a metal material such as stainless steel (SUS) so as to form a closed space communicating with the processing chamber 11 in the process tube 10 through the furnace port 13.
- SUS stainless steel
- a boat 12 as a substrate support for supporting the wafer 2 is arranged so as to be movable in the vertical direction in the space. More specifically, the boat 12 is connected to the support rod 16 of the elevating mechanism (boat elevator) via the heat insulating cap portion 15 arranged below the boat 12, and is arranged in the process tube 10 by the operation of the elevating mechanism.
- the state (wafer processable state) and the state arranged in the lower chamber 14 (wafer transferable state) are transitioned.
- the furnace port 13 of the process tube 10 is sealed by a seal cap (not shown), whereby the airtight state in the process tube 10 is maintained.
- the elevating mechanism for moving the boat 12 in the vertical direction may have a function as a rotation mechanism for rotating the boat 12.
- the boat 12 that supports the wafer includes a pair of end plates and a plurality of (for example, three) holding members vertically erected between them, and engraved at equal intervals in the longitudinal direction of each holding member. By inserting the wafers 2 into the same stage of the holding grooves, the plurality of wafers 2 are aligned and held horizontally and centered on each other.
- the boat 12 is made of a heat-resistant material such as quartz or SiC. Further, since the boat 12 is supported downward via the heat insulating cap portion 15, the boat 12 is housed in the process tube 10 in a state where the lower end thereof is separated from the position of the furnace port 13 arranged by an appropriate distance. That is, the heat insulating cap portion 15 is designed to insulate the vicinity of the furnace port 13, and has a function of suppressing heat conduction downward from the boat 12 holding the wafer 2 to assist precise wafer temperature control. have.
- a nozzle (but not shown) extending from the lower region to the upper region of the processing chamber 11 is provided in the process tube 10 in which the boat 12 is housed.
- the nozzle is provided with a plurality of gas supply holes arranged along the extending direction thereof.
- a predetermined type of gas is supplied to the wafer 2 from the gas supply hole of the nozzle.
- the type of gas supplied from the nozzle may be a preset type according to the content of processing in the processing chamber 11. For example, when the film forming process is performed, it is conceivable to supply the raw material gas, reaction gas, inert gas, etc. required for the film forming process to the processing chamber 11 as a predetermined type of gas.
- an exhaust pipe (but not shown) for exhausting the atmospheric gas of the processing chamber 11 is connected to the process tube 10.
- a pressure sensor, an APC (Auto Pressure Controller) valve, a vacuum pump, and the like are connected to the exhaust pipe so that the pressure in the processing chamber 11 can be adjusted.
- a heater unit 20 as a heating unit is provided with the process tube 10 in order to heat the wafer 2 in the process tube 10. They are arranged in concentric positions.
- the heater unit 20 includes a heat insulating case portion 21 arranged so as to cover the outer side.
- the heat insulating case portion 21 has a function of suppressing heat conduction from the heater 22 to the outside of the device, which will be described later. Therefore, for this purpose, a metal material such as stainless steel (SUS) is used to form a cylinder with an upper end closed and a lower end opening. , Preferably formed in a cylindrical shape.
- SUS stainless steel
- the heater unit 20 is provided with a heating heater 22 as a heating element that generates heat on the inner side of the heat insulating case portion.
- the heating heater 22 is arranged so that the heat generating surface faces the outer peripheral surface of the process tube 10.
- the heating heater 22 for example, it is conceivable to use a heating type lamp heater using infrared radiation by a halogen lamp or a heating type resistance heating heater using Joule heat due to electrical resistance.
- the lamp heater is not practical because of its high cost and short life, and since the elevating temperature is fast, for example, in the temperature range of 400 ° C. or higher, between wafers (WTW: wafer-to-wafer) and inside the wafer (WIW). : With-in-wafer), the temperature deviation may increase.
- the resistance heater has a small WTW deviation and WIW deviation, but the temperature rise rate in a low temperature range of less than 400 ° C. becomes slow, for example.
- the wavelength of the radiant wave radiated from the resistance heating heater and the process tube 10 made of quartz are transmitted. Due to the different wavelengths and the wavelengths absorbed by the wafer 2 which is the object to be processed in the processing chamber 11, the radiant waves do not reach the wafer 2 efficiently, and therefore, compared with the case of the lamp heater. It may take time to raise the temperature.
- a resistance heating heater is used as the heating heater 22, thereby reducing the cost and extending the life of the heating heater 22, and further details will be described later.
- the radiation control body 30 By arranging the radiation control body 30 between the process tube 10 and the heater unit 20 and controlling the radiation intensity in a wavelength-selective manner by the radiation control body 30, the rise in the low temperature range (for example, less than 400 ° C.)
- the medium temperature range for example, 400 ° C or higher and lower than 650 ° C.
- the radiation control body 30 is located between the process tube 10 which is a reaction tube made of quartz (hereinafter, also referred to as “quartz tube”) and the heating heater 22 in the heater unit 20. Is placed.
- the radiation control body 30 is for controlling the radiation intensity of the radiation wave radiated toward the process tube 10 in a wavelength-selective manner. More specifically, the radiation control body 30 radiates radiant waves in a wavelength band different from the radiant heat from the heater 22 toward the process tube 10 in response to the heating from the heater 22 in the heater unit 20. It is composed of. That is, the heat generated from the heater 22 is wavelength-converted by the radiation control body 30 and radiated toward the process tube 10.
- the term "wavelength conversion" as used herein means a concept that broadly includes radiating heat in a wavelength band different from that when heat is received.
- the "wavelength conversion" referred to here. Will correspond to.
- FIG. 2 is a side sectional view schematically showing a configuration example of a radiation control body in the semiconductor manufacturing apparatus according to the first embodiment.
- the radiation control body 30 shown in FIG. 2 is formed as a plate-like body arranged between the heater 22 and the process tube 10, and is located on the side of the substrate K and the process tube 10 located on the side of the heater 22. It is configured by stacking the heat radiation layer N located.
- the substrate K is configured to be in a high temperature state (for example, 800 ° C.) due to heat from the heating heater 22 so as to heat the thermal radiant zone N which is a stacking partner.
- the substrate K may be any one that can be in a high temperature state, for example, quartz (SiO 2 ), sapphire (Al 2 O 3 ), stainless steel (SUS), kanthal, nichrome, aluminum, silicon, etc., which are heat-resistant materials. It can be formed using various materials.
- the thermal radiation layer N When the thermal radiation layer N is heated by the substrate K in a high temperature state, the thermal radiation layer N is configured to radiate a radiation wave having a wavelength, which will be described in detail later, toward the process tube 10 by the heating. Therefore, in the thermal radiation layer N, the radiation control unit Na and the radiation transparent oxide layer Nb formed of a transparent oxide such as alumina (aluminum oxide, Al 2 O 3) are formed from the side of the substrate K. It is configured by stacking in order. Of these, the radiation control unit Na is a resonance formed by a transparent oxide such as alumina between the platinum layers P as a pair of metal layers arranged along the stacking direction of the substrate K and the thermal radiation layer N. It is configured to have a laminated portion M having a so-called MIM (metal radiation metal) structure in which the transparent oxide layer R for use is located.
- MIM metal radiation metal
- the radiation control unit Na of the thermal radiation layer N in the radiation control body 30 includes a laminated portion M including a platinum layer P which is a metal layer and a transparent oxide layer R for resonance which is an oxide layer.
- the laminated portion M has a MIM structure in which the transparent oxide layer R for resonance is positioned between the pair of platinum layers P.
- the platinum layer P adjacent to the substrate K is referred to as a first platinum layer P1
- the platinum layer P adjacent to the transparent oxide layer Nb for radiation is referred to as a second platinum layer P2. ..
- the first platinum layer P1, the transparent oxide layer R for resonance, the second platinum layer P2, and the radiation oxide layer Nb are formed from the side of the substrate K (that is, the side of the heater 22). , Are formed and configured in order.
- the transparent oxide layer R for resonance has a wavelength (specifically, for example, 4 ⁇ m or less) transmitted through the process tube (quartz tube) 10. ) Is set as the resonance wavelength.
- the platinum layer P first platinum layer P1 and second platinum layer P2 possessed by the radiation control unit Na. Emits a radiant wave.
- the emissivity (emissivity) of the radiant wave tends to gradually increase toward a shorter wavelength in a wavelength range of 4 ⁇ m or less, and maintains a low value in a wavelength range larger than 4 ⁇ m.
- the thickness of the transparent oxide layer R for resonance of the MIM laminated portion M is such that the wavelength of 4 ⁇ m or less, which is the wavelength transmitted through the quartz tube 10, is set as the resonance wavelength, the MIM laminated portion M has a thickness.
- Wavelengths of 4 ⁇ m or less that is, wavelengths in a narrow band below mid-infrared light
- the amplified radiation wave H having a wavelength of 4 ⁇ m or less is emitted to the outside from the transparent oxide layer Nb for radiation.
- the transparent oxide layer R for resonance is configured to amplify the radiant wave while repeatedly reflecting the radiant wave between the platinum layers P (the first platinum layer P1 and the second platinum layer P2). There is. Therefore, if the thickness of the transparent oxide layer R for resonance is set so that the wavelength of 4 ⁇ m or less (that is, the wavelength transmitted through the quartz tube 10) is set as the resonance wavelength, the radiation wave having a wavelength of 4 ⁇ m or less is amplified. Then, the amplified radiant wave having a wavelength of 4 ⁇ m or less is emitted to the outside.
- a radiant wave having a wavelength larger than 4 ⁇ m is emitted to the outside from the transparent oxide layer Nb for radiation in a state where it is rarely amplified by the resonance action.
- the radiated wave H from the transparent oxide layer Nb for radiation has a large emissivity (emissivity) at a narrow band wavelength of 4 ⁇ m or less (narrow band wavelength of mid-infrared light or less), and is more than 4 ⁇ m. Also has a small emissivity (emissivity) at a large wavelength (wavelength of far-infrared light).
- the radiation control body 30 shown in FIG. 2 mainly uses the radiation wave having a wavelength of 4 ⁇ m or less amplified by the MIM laminated portion M as a radiation wave having a wavelength transmitted through the process tube (quartz tube) 10. It radiates from the transparent oxide layer Nb to the outside.
- the first platinum layer P1 can be configured to shield the radiated wave from the side of the substrate K (that is, the side of the heater 22). In this way, if the first platinum layer P1 shields the radiation wave and suppresses the transmission into the inside of the radiation control body 30 (particularly, the transparent oxide layer R for resonance in the MIM laminated portion M), the radiation control body 30 It is suppressed from affecting the radiant waves emitted from.
- the second platinum layer P2 can be configured to transmit a part of the radiated wave from the side of the substrate K (that is, the side of the heater 22). More specifically, the second platinum layer P2 can be configured to transmit radiated waves having a narrow band wavelength of 4 ⁇ m or less, which is a wavelength transmitted through the process tube (quartz tube) 10. As described above, if the second platinum layer P2 transmits a part of the radiation wave, as a result, the radiation having a wavelength of 4 ⁇ m or less (that is, the wavelength transmitted through the quartz tube 10) amplified by the MIM laminated portion M is emitted. The wave will be radiated to the outside from the radiation control body 30.
- the transparent oxide layer Nb for radiation has a lower refractive index than the second platinum layer P2, which is a metal layer, and a higher refractive index than air. If such a transparent oxide layer Nb for radiation is arranged adjacent to the second platinum layer P2, the reflectance in the second platinum layer P2 is reduced, and as a result, radiation is emitted from the radiation controller 30 to the outside. Waves can be radiated well.
- the radiation control unit Na may include a plurality of MIM laminated units M.
- the radiation control unit Na may include a plurality of MIM laminated units M.
- three or more platinum layers P arranged along the laminating direction of the thermal radiation layer N and the substrate K are provided, and transparent oxidation for resonance is provided between adjacent ones in the platinum layer P. It means a configuration in which the material layer R is positioned.
- the radiation control body 30 receives heat from the heater 22.
- the radiation control body 30 may be configured by using a wavelength control technique other than that by the MIM laminated portion M.
- a wavelength control technique other than that by the MIM laminated portion M.
- Examples of those using other wavelength control techniques include a radiation control body composed of a quartz plate having characteristics as an optical filter.
- the radiation control body (quartz plate) having such a configuration transmits 90% or more of wavelengths of about 4 ⁇ m or less, and on the contrary, absorbs most of the wavelengths longer than that.
- the radiation control body 30 may be configured by using another known technique (wavelength control technique).
- the radiation control body 30 having the above configuration is used by being arranged between the process tube 10 and the heating heater 22.
- the radiation control body 30 is the heating heater in the heater unit 20. It is arranged away from the heat generating surface (heat radiating surface) of 22. In that case, if the radiation control body 30 is arranged between the process tube 10 and the heating heater 22 so that the distance from the heating heater 22 is closer than the distance from the process tube 10, the radiation control body 30 is arranged.
- the heating of 30 can be performed efficiently, and it is also preferable for cooling the process tube 10 by a cooling unit (cooling mechanism) described later.
- the radiation control body 30 may be arranged between the process tube 10 and the heater 22 by using a holding member (however, not shown in FIG. 1) that supports the radiation control body 30.
- a holding member a member configured to suspend and support the radiation control body 30 from the upper side can be used.
- the present invention is not limited to this, and the radiation control body 30 may be supported by another configuration, for example, the lower end of the radiation control body 30 is supported on the lower side.
- the semiconductor manufacturing apparatus 1 shown in FIG. 1 is provided with a cooling unit (cooling mechanism) in addition to the process tube 10, the heater unit 20 and the radiation control body 30 described above. There is.
- the cooling unit is mainly for cooling the process tube 10, and at least the introduction unit 41 that introduces the cooling gas between the process tube 10 and the heating heater 22 in the heater unit 20 and the introduced cooling gas. It is configured to have an exhaust unit 42 for exhausting air.
- a known gas for example, an inert gas such as N 2 gas
- the components (gas supply source, etc.) of the introduction unit 41 and the components (exhaust pump, etc.) of the exhaust unit 42 may also be those using known techniques, and detailed description thereof will be omitted here.
- the gas introduction port 41a of the introduction unit 41 and the gas exhaust port 42a of the exhaust unit 42 are arranged so that the cooling gas flows in the vicinity of the outer peripheral surface of the process tube 10 along the process tube 10. .. That is, the cooling gas mainly flows between the process tube 10 and the radiation control body 30 along the process tube 10.
- cooling unit it is possible to prevent the process tube 10 from becoming hot by flowing cooling gas.
- the cooling gas is allowed to flow in the vicinity of the outer peripheral surface of the process tube 10, the flow velocity of the cooling gas in the vicinity of the outer peripheral surface is maximized, and the cooling gas comes into contact with the process tube 10 in a low temperature (normal temperature) state. Therefore, the cooling efficiency can be improved.
- the boat 12 holding the wafers 2 is carried into the processing chamber 11 (boat loading) by the operation of the boat elevator.
- the furnace port 13 of the process tube 10 is sealed, and the airtight state of the processing chamber 11 is maintained in the state where the wafer 2 is housed.
- the inside of the processing chamber 11 is exhausted by an exhaust pipe (not shown) and adjusted to a predetermined pressure. Further, the inside of the processing chamber 11 is heated to the target temperature by utilizing the heat generated by the heating heater 22 in the heater unit 20 (see the hatching arrow in FIG. 1). The specific mode of heating at this time will be described in detail later. Further, the boat 12 is rotated by a boat elevator (rotation mechanism). When the inside of the processing chamber 11 is heated, the process tube 10 can be cooled by the cooling gas (see the black arrow in FIG. 1).
- a predetermined type of gas for example, raw material gas
- a nozzle not shown
- the gas supplied to the processing chamber 11 flows so as to touch the wafer 2 housed in the processing chamber 11, and then is exhausted by an exhaust pipe (not shown).
- a predetermined film is formed on the wafer 2 by a thermal CVD reaction caused by contact of the raw material gas with the wafer 2 heated to a predetermined processing temperature.
- the supply of the raw material gas and the like is stopped, while the inert gas (purge gas) such as the N 2 gas is supplied to the processing chamber 11. Then, the gas atmosphere in the processing chamber 11 is replaced. Further, the heating by the heating heater 22 is stopped to lower the temperature of the processing chamber 11. Then, when the temperature of the processing chamber 11 drops to a predetermined temperature, the boat 12 holding the wafer 2 is carried out (boat unloading) from the processing chamber 11 by the operation of the boat elevator.
- the film forming step on the wafer 2 is carried out.
- the operation of each part constituting the semiconductor manufacturing apparatus 1 is controlled by a controller (not shown) included in the semiconductor manufacturing apparatus 1.
- the controller functions as a control unit (control means) of the semiconductor manufacturing apparatus 1, and is configured to include hardware resources as a computer apparatus. Then, when the hardware resource executes a program (for example, a control program) or a recipe (for example, a process recipe) which is the predetermined software, the hardware resource and the predetermined software cooperate with each other to perform the above-described processing. It is designed to control the operation.
- the controller as described above may be configured as a dedicated computer or a general-purpose computer.
- 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
- the controller according to the present embodiment can be configured by preparing the above and installing the program on a general-purpose computer using the external storage device.
- the means for supplying the program to the computer is not limited to the case of supplying the program via the external storage device.
- a communication means such as the Internet or a dedicated line may be used, or information may be received from a host device via a receiving unit and the program may be supplied without going through an external storage device.
- the storage device in the controller and the external storage device that can be connected to the controller are configured as a computer-readable recording medium.
- these are collectively referred to simply as a recording medium.
- recording medium when used in this specification, it may include only a storage device alone, it may include only an external storage device alone, or it may include both of them.
- the temperature of the wafer 2 is raised by allowing the radiant waves to reach the wafer 2 via the process tube 10.
- the wafer 2 is rapidly heated from room temperature (normal temperature) to a set temperature of, for example, 300 to 400 ° C., and the temperature is precisely controlled.
- room temperature normal temperature
- the temperature of the process tube 10 rises more than necessary (for example, when it becomes 500 ° C.
- the heat generation from the heater 22 is stopped after the wafer 2 reaches the set temperature of, for example, 300 to 400 ° C.
- the set temperature of, for example, 300 to 400 ° C.
- an overshoot phenomenon may occur in which the temperature of the wafer 2 continues to rise due to heat transfer from the process tube 10 which has become a high temperature state.
- the time required for precisely controlling the wafer 2 to reach the set temperature becomes remarkably long, and as a result, the productivity of the substrate processing on the wafer 2 decreases.
- a resistance heating heater instead of a lamp heating heater as the heating heater 22 from the viewpoint of cost reduction and long life of the heating heater 22.
- the resistance heater is simply used as the heater 22, the radiant wave does not reach the wafer 2 efficiently, and therefore, there is a possibility that the temperature rise time is longer than that of the lamp heater.
- the radiation control body 30 is arranged between the process tube 10 and the heating heater 22, and the radiation control body 30 controls the heat radiation. It has a heating structure.
- a heating structure includes at least a heating heater 22 that emits heat and a radiation control body 30 that controls heat radiation, and the radiation control body 30 has radiation waves in a wavelength band different from the heat radiated from the heating heater 22. Specifically, it is configured to radiate a radiation wave having a wavelength of 4 ⁇ m or less, which is a wavelength transmitted through the process tube 10, to the process tube 10.
- the part constituting the heating structure may be referred to as a “heat radiant device”.
- FIG. 3 is a conceptual diagram schematically showing an example of heat radiation control by the heating structure of the semiconductor manufacturing apparatus according to the first embodiment.
- the heating heater 22 first generates heat during the heat treatment.
- the heating heater 22 is a resistance heating heater, for example, considering the wavelength band radiated from the gray body of about 1100 K, which is the temperature of the heating element at the time of temperature rise, the wavelengths of 0.4 to 100 ⁇ m and 100 ⁇ m or more are considered. It emits radiated waves in a band (that is, a wavelength band extending from near infrared to mid-infrared to far infrared) (see arrow A in the figure). The radiation control body 30 is heated by this radiation wave.
- the radiant control body 30 When the radiant control body 30 is heated, the radiant control body 30 emits a new radiant wave in a wavelength band different from the radiant heat from the heating heater 22 on the side of the process tube 10 by wavelength-selective radiant intensity control. Radiates toward (see arrow B in the figure).
- the radiation controller 30 is, for example, a radiation wave having a narrow band wavelength of mainly 4 ⁇ m or less (a narrow band wavelength of mid-infrared light or less), more preferably a narrow band wavelength of mainly 1 ⁇ m or less. Radiant waves (wavelengths in a narrow band including the near-infrared region) are radiated toward the process tube 10.
- the radiation wave from the radiation control body 30 mainly passes through the process tube 10 if it has a wavelength of 4 ⁇ m or less (including a wavelength of 1 ⁇ m or less).
- a wavelength of 4 ⁇ m or less including a wavelength of 1 ⁇ m or less.
- absorption in the process tube 10 is unlikely to occur.
- the process tube 10 is difficult to be heated by the radiant wave, and it is suppressed that the temperature rises more than necessary (for example, 500 ° C. or higher).
- the radiant wave that arrived as it is is transmitted (see arrow C in the figure).
- the cooling unit allows the cooling gas to flow, it is even more effective in suppressing the temperature rise of the process tube 10.
- the radiation wave transmitted through the process tube 10 (for example, the radiation wave having a narrow band wavelength of 1 ⁇ m or less, which is mainly in the near infrared region) reaches the wafer 2 and is absorbed by the wafer 2 (arrow D in the figure). reference). That is, the radiation control body 30 radiates a radiant wave having a wavelength transmitted through the process tube 10 in response to heating from the heating heater 22, and causes the radiant wave to reach the wafer 2 in the process tube 10. Radiation control is performed.
- the wafer 2 is heated to the target temperature and adjusted to maintain that temperature.
- the radiant wave having an intensity sufficient for rapid temperature rise reaches the wafer 2
- the wafer 2 can be rapidly heated.
- the heating heater 22 is a resistance heating heater, it is possible to efficiently reach the wafer 2 with radiant waves and realize a rapid temperature rise of the wafer 2.
- the heating structure using the radiation control body 30 does not raise the temperature of the process tube 10 more than necessary (for example, 400 to 500 ° C. or higher), and the wavelength band absorbed by the wafer 2 (for example, 400 to 500 ° C. or higher). It is possible to allow a radiant wave of 4, ⁇ m or less, preferably 1 ⁇ m or less) to reach the wafer 2 with sufficient intensity for rapid temperature rise. Therefore, according to such a heating structure, the radiation intensity is selectively controlled by the radiation controller 30 in a low temperature range (for example, less than 400 ° C.) while reducing the cost and extending the life of the heating heater 22. It is possible to achieve both improvement in temperature rise performance and maintenance of stable performance (elimination of deviation) in a medium temperature range (for example, 400 ° C. or higher and lower than 650 ° C.).
- a medium temperature range for example, 400 ° C. or higher and lower than 650 ° C.
- the heat radiation device constituting such a heating structure includes at least the heating heater 22 of the heater unit 20 and the radiation control body 30. That is, the heat radiation device referred to here includes at least a heating heater 22 that emits heat to the process tube 10 and a radiation control body 30 arranged between the process tube 10 and the heating heater 22. It will be the one that was done.
- FIG. 4 is a perspective view schematically showing an arrangement example of a radiation control body in the semiconductor manufacturing apparatus according to the first embodiment.
- the radiation control body 30 for example, a strip-shaped plate-shaped body is used.
- the length, width, thickness and other dimensions of the plate-shaped body may be appropriately set according to the size of the process tube 10 and the distance between the process tube 10 and the heater 22. It is assumed that the radiation control body 30 is provided with a locking hole 31 for suspending and supporting the radiation control body 30.
- the radiation control body 30 is configured by laminating the substrate K and the thermal radiation layer N (see FIG. 2), the substrate K is located on the side of the heating heater 22, and the thermal radiation layer N is located. Is located between the process tube 10 and the heating heater 22 in a state where is located on the side of the process tube 10. At this time, if the radiation control body 30 is arranged so that the distance from the heating heater 22 is closer than the distance from the process tube 10, the radiation control body 30 can be efficiently heated. It is also preferable for cooling the process tube 10 by the cooling unit.
- the radiation control body 30 is suspended and supported by the holding member 32, so that the radiation control body 30 is arranged between the process tube 10 and the heating heater 22.
- the holding member 32 has an annular portion 32a having a shape corresponding to the process tube 10.
- the "corresponding shape” is a similar shape corresponding to the planar shape of the process tube 10.
- the annular portion 32a has an annular shape that is concentric with the process tube 10.
- the holding member 32 has a plurality of (that is, at least two) mounting piece portions 32b to be mounted on the ceiling portion of the process tube 10.
- a plurality of connecting tools 33 are attached to the holding member 32 at predetermined intervals in the circumferential direction of the annular portion 32a. A locking hole 31 of the radiation control body 30 is locked to each of the connecting tools 33.
- the holding member 32 and the connecting tool 33 can be formed of, for example, a metal material having excellent heat resistance (for example, SUS). With such a configuration, the holding member 32 is attached to the ceiling portion of the process tube 10, and each radiation control body 30 surrounds the process tube 10 with a plurality of (for example, 27) radiation control bodies 30. 30 will be suspended and supported.
- a metal material having excellent heat resistance for example, SUS
- the radiation control body 30 can be arranged with a very simple configuration. Therefore, for example, it is possible to easily cope with the case where the radiation control body 30 is additionally arranged in the wafer heating structure in the existing device. Further, if the connector 33 is configured so that the radiation control body 30 can be attached and detached, it is possible to easily replace the radiation control body 30 as needed.
- the radiation control body 30 it is easily feasible to arrange the radiation control body 30 at an appropriate position. Specifically, it is easily feasible to arrange the radiant control body 30 at a position close to the heating heater 22 and not in contact with the heating heater 22 so that the radiant control body 30 can efficiently heat the radiant control body 30. Become.
- the side surface of the process tube 10 is abbreviated.
- the radiation control body 30 can be arranged so as to surround the entire surface. Specifically, for example, it is feasible to arrange a plurality of radiation control bodies 30 so as to cover 95% or more of the side surface of the process tube 10. If the radiation control body 30 is arranged so as to cover 95% or more, it is possible to prevent the radiation wave from the heater 22 from directly reaching the process tube 10, so that efficient heat treatment can be performed. Is very preferable.
- the radiation control body 30 can surround the process tube 10. That is, as the radiation control body 30, a strip-shaped plate-shaped body can be used. Therefore, it is possible to easily adjust the configuration of the radiation control body 30 (for example, the thickness of the transparent oxide layer R for resonance in the MIM laminated portion M), and as a result, the optimization of thermal radiation control is realized. It will be possible.
- a connecting jig (but not shown) for suppressing shaking may be attached to the lower side of each radiation control body 30.
- a connecting jig for example, a jig configured to connect adjacent radiation control bodies 30 can be used.
- FIG. 5 is a plan view schematically showing an arrangement example of a radiation control body in the semiconductor manufacturing apparatus according to the first embodiment.
- the holding member 32 heats the radiation control body 30 so that the radiation control body 30 that supports the suspension does not interfere with the heating heater 22 even if thermal expansion occurs due to heating from the heating heater 22.
- a clearance for the heater 22 is set. More specifically, even if the outer peripheral diameter D1 of each radiation control body 30 arranged so as to surround the process tube 10 is increased due to thermal expansion when the temperature becomes high (for example, about 700 ° C.) during thermal radiation control.
- the mounting position of each connecting tool 33 on the holding member 32 is set so as to be less than the inner peripheral diameter D2 of the heating heater 22.
- the arrangement of the radiation control body 30 is not limited to the above-described embodiment, and may be another embodiment.
- FIG. 6 is an explanatory diagram (No. 1) schematically showing another arrangement example of the radiation control body in the semiconductor manufacturing apparatus according to the first embodiment.
- the radiation control body 30a is formed in a strip-shaped longitudinal direction shorter than the pipe length of the process tube 10. Then, holding members (not shown) are arranged in a plurality of stages along the pipe length direction of the process tube 10, and the holding members in each stage suspend and support the radiation control body 30a by using the locking holes 31. It has become.
- a plurality of radiation control bodies 30a are arranged between the process tube 10 and the heater 22 so as to surround the process tube 10 and are arranged in the pipe length direction of the process tube 10. Will be placed in. That is, a plurality of radiation control bodies 30a are arranged side by side in a so-called matrix.
- each radiation control body 30a may be configured so that shaking is suppressed by a fixing pin 34 as a connecting jig. Further, a part or all of each radiation control body 30a may be provided with a quenching hole 35 through which the cooling gas by the cooling unit passes in order to efficiently cool the process tube 10.
- each radiation control body 30a is configured so that the wavelength characteristics of the radiation waves radiated to the process tube 10 differ depending on the arrangement location. You may.
- FIG. 7 is an explanatory diagram (No. 2) schematically showing another arrangement example of the radiation control body in the semiconductor manufacturing apparatus according to the first embodiment.
- the radiation control body 30b suspended and supported by the stage corresponding to the arrangement region 36 and the radiation control body 30b suspended and supported by the stage corresponding to the non-arrangement region 37.
- the wavelength characteristics of the radiant wave radiated to the process tube 10 are made different from those of 30c.
- the radiation control body 30b in the arrangement region 36 has a wavelength characteristic that radiates a wavelength for efficiently heating the wafer 2, and more specifically, for example, a wavelength of mainly 4 ⁇ m or less, more preferably mainly.
- a wafer having a wavelength characteristic that emits a wavelength of 1 ⁇ m or less is used.
- the radiation control body 30c in the non-arrangement region 37 has a wavelength characteristic of radiating a wavelength for efficiently heating quartz, which is a material for forming the process tube 10, and more specifically, for example, a wavelength of mainly 3 ⁇ m or more. More preferably, a wavelength characteristic that emits a wavelength larger than 4 ⁇ m is mainly used.
- the wafer 2 in the arrangement region 36 can be efficiently heated, and the top plate and the heat insulating cap portion of the process tube 10 in the non-arrangement region 37 located above and below the arrangement region 36 can be efficiently heated. 15 can also be heated at the same time as the wafer 2. Therefore, even if the temperature rise of the wafer 2 is accelerated by efficient heating, the top plate of the process tube 10 and the heat insulating cap portion 15 can act as a heat source, whereby WTW, for example, in a temperature range of 400 ° C. or higher. It becomes possible to suppress the occurrence of WIW temperature deviation.
- the present embodiment also includes a configuration in which the radiation control body 30 is not provided at a height position corresponding to the heat insulating plate region below the substrate arrangement region. According to this, rather, since the quartz cylinder and the quartz heat insulating plate are the heating targets in the heat insulating plate region under the heater, it is preferable that the radiation control body 30 is not provided. This is because the absence of the radiation control body 30 causes radiation waves including wavelengths absorbed by the quartz member to be emitted, and the heating efficiency of the heat insulating plate region is further improved.
- FIG. 8 is an explanatory diagram (No. 3) schematically showing another arrangement example of the radiation control body in the semiconductor manufacturing apparatus according to the first embodiment.
- a nozzle 17 serving as a gas supply path is formed in the process tube 10, and a predetermined type of gas is supplied to the processing chamber 11 through the nozzle 17.
- the radiation control bodies 30d arranged at the locations corresponding to the nozzles 17 and the radiation control bodies 30e arranged at other locations radiate to the process tube 10.
- the radiation control body 30d that radiates a radiant wave to the location where the nozzle 17 is arranged has a wavelength characteristic that radiates a wavelength for efficiently heating quartz, which is a material for forming the process tube 10. More specifically, for example, a wavelength characteristic that radiates a wavelength of mainly 3 ⁇ m or more, more preferably a wavelength larger than 4 ⁇ m is used.
- the radiation control body 30e arranged in other places has a wavelength characteristic of radiating a wavelength for efficiently heating the wafer 2, and more specifically, for example, a wavelength of mainly 4 ⁇ m or less, more preferably a main body. Use a wafer with wavelength characteristics that radiates a wavelength of 1 ⁇ m or less.
- the portion of the process tube 10 near the nozzle arrangement portion is heated, and the heat can be used to preheat the gas flowing through the nozzle 17. Therefore, it becomes feasible to improve the efficiency and appropriateness of the processing of the wafer 2 using the gas.
- the radiation control bodies 30d and 30e are arranged in only one stage along the pipe length direction of the process tube 10 (that is, the radiation control bodies 30d and 30e are arranged in the pipe length direction of the process tube 10). Aspects that are not divided) are shown, but the present invention is not necessarily limited to this. For example, even in the case where a plurality of radiation control bodies 30a are arranged side by side in the pipe length direction of the process tube 10 as in the embodiment shown in FIG. 6, radiation waves are emitted in the vicinity of the nozzle arrangement location and in other locations. The wavelength characteristics of the above may be different.
- the mode in which the wavelength characteristics of the radiated wave are different between the vicinity of the nozzle arrangement location and the other locations is shown, but the present invention is not necessarily limited to this.
- the wavelength characteristics of the radiation control body 30f arranged at the location corresponding to the buffer chamber 18 can be determined. It is also feasible to make it different from other parts.
- quartz also referred to as "quartz glass”
- fused silica glass obtained by melting natural quartz at a high temperature and chemically synthesized high-purity raw materials.
- synthetic quartz glass There is synthetic quartz glass.
- Fused quartz glass is classified into oxyhydrogen molten glass by which the heat source of melting is oxyhydrogen flame and electric molten glass by electricity.
- Oxyhydrogen molten glass contains OH groups inside the glass because it is melted by an oxyhydrogen flame that generates water, but electrically molten glass does not contain OH groups.
- Synthetic quartz glass has a higher purity than fused silica glass.
- silicon tetrachloride (SiCl 4 ) can be obtained by hydrolyzing silicon tetrachloride (SiCl 4) by a direct method (Bernouy method) if it utilizes a flame hydrolysis reaction.
- a direct method synthetic glass to be, classified the SiCl 4 soot method VAD method synthetic glass obtained by hydrolyzing at (VAD method), the.
- VAD method has a lower OH group content than the direct synthetic glass.
- Quartz glass has various characteristics such as light transmittance, which differ depending on the type.
- oxyhydrogen molten glass and direct synthetic glass containing a large amount of OH groups have a property of absorbing light having a wavelength in the vicinity of 2.2 to 2.7 ⁇ m because they contain OH groups.
- the electro-molten glass and the VAD synthetic glass do not have the property of absorbing light in such a wavelength range because of their low OH group content.
- the type of quartz glass forming the process tube 10 may be partially different so that different characteristics can be exhibited at each location.
- the portion near the arrangement location of the nozzle 17 that is, the portion arranged at the position facing the radiation control body 30d
- the portion near the arrangement location of the nozzle 17 is melted by hydrogen acid containing a large amount of OH groups. It is formed of glass and direct synthetic glass, and the other portion (that is, the portion arranged at a position facing the radiation control body 30e) is formed of electrically fused glass having a low OH group content and VAD synthetic glass. ..
- the wavelength larger than 4 ⁇ m but also the wavelength of 4 ⁇ m or less, particularly the wavelength near 2.2 to 2.7 ⁇ m, can be used as the material for forming the process tube 10 in the vicinity of the nozzle 17 arrangement location. Absorbed by some quartz. Therefore, the portion of the process tube 10 near the nozzle arrangement portion is heated more efficiently, which is very suitable for preheating the gas flowing through the nozzle 17 using the heat. ..
- a radiation control body 30 is arranged between the process tube 10 and the heating heater 22, and the radiation control body 30 radiates radiation in a wavelength band different from the heat radiated from the heating heater 22. Radiate the waves to the process tube 10. That is, the heat radiation control is performed by the radiation control body 30 between the process tube 10 and the heating heater 22. Therefore, according to the present embodiment, it is possible to efficiently reach the wafer 2 with the radiant waves in the wavelength band absorbed by the wafer 2 without raising the temperature of the process tube 10 more than necessary. If the temperature rise of the process tube 10 itself is suppressed, there will be no adverse effect due to the high temperature of the process tube 10.
- the heating heater 22 is a resistance heating heater, it is possible to efficiently reach the wafer 2 with radiant waves and realize a rapid temperature rise of the wafer 2. Moreover, it is easily feasible to precisely control the wafer 2 to reach the set temperature after the temperature is raised. That is, in the present embodiment, the radiation intensity is selectively controlled by the radiation controller 30 to reduce the cost and the life of the heater 22, and the temperature rises in a low temperature range (for example, less than 400 ° C.). It is possible to achieve both performance improvement and stable performance maintenance (deviation elimination) in a medium temperature range (for example, 400 ° C. or higher and lower than 650 ° C.). Therefore, according to the present embodiment, even if the wavelength of the radiant wave from the heater 22, the wavelength transmitted through the process tube 10, and the wavelength absorbed by the wafer 2 to be processed are different, the wafer 2 is used. Can be efficiently and appropriately processed.
- the radiation control body 30 is formed as a strip-shaped plate-like body, and is suspended and supported by a holding member 32 so as to surround the process tube 10. That is, the radiation control body 30 is arranged between the process tube 10 and the heating heater 22 in a state separated from the heating heater 22. Therefore, the radiation control body 30 can be arranged with a very simple configuration, and for example, it is possible to easily cope with the case where the radiation control body 30 is additionally arranged in the wafer heating structure in the existing device. Become. Further, if the radiation control body 30 is detachably configured, it is possible to easily replace the radiation control body 30 as needed.
- the radiation control body 30 is arranged between the process tube 10 and the heating heater 22 so that the distance to the heating heater 22 is closer than the distance to the process tube 10. If so, the radiation control body 30 can be efficiently heated, and the process tube 10 can be cooled by the cooling unit, which is also preferable.
- the clearance of the radiation control body 30 with respect to the heating heater 22 is provided so that the radiation control body 30 does not interfere with the heating heater 22 even if thermal expansion occurs due to heating from the heating heater 22. If it is set, interference between the radiation control body 30 and the heating heater 22 does not occur even when the temperature becomes high (for example, about 700 ° C.) during thermal radiation control. Therefore, it is possible to prevent a situation in which the heat radiation control is hindered.
- the radiation waves radiated to the process tube 10 according to the respective arrangement locations.
- the wavelength characteristics are configured to be different, it is very preferable for efficiently and appropriately heating the radiation control body 30.
- the wafer 2 can be efficiently heated, for example, 400. It is possible to suppress the occurrence of temperature deviations of WTW and WIW in the temperature range of ° C. or higher.
- the gas flowing through the gas supply path can be different. Preheating can be performed, and it becomes feasible to improve the efficiency and appropriateness of the processing of the wafer 2 using the gas.
- the radiation control body 30 is configured to have a MIM laminated portion M, has a large emissivity at a narrow band wavelength of 4 ⁇ m or less, and has a wavelength larger than 4 ⁇ m.
- the emissivity is small. Therefore, it is very preferable for radiating a radiant wave having a wavelength transmitted through the process tube 10 to reach the wafer 2 in the process tube 10.
- FIG. 10 is a side sectional view schematically showing a schematic configuration example of the semiconductor manufacturing apparatus according to the second embodiment.
- a radiation control body 30 is attached to the heating heater 22 so as to cover the heat generating surface of the heating heater 22 in the heater unit 20.
- the radiation control body 30 is formed by, for example, the thermal radiation layer N described in the first embodiment described above being laminated on the heat generating surface of the heating heater 22. That is, the radiation control body 30 is configured by replacing the substrate K described in the first embodiment described above with the heat generating surface of the heating heater 22.
- the configuration does not include the radiation control body 30 (heat radiation layer N) at the height position corresponding to the heat insulating plate region below the substrate arrangement region.
- the heating target is different between the substrate arrangement region and the heat insulating plate region, and it is necessary to change the thermal radiation layer N formed to form the radiation control body 30, but with this configuration,
- the absence of the radiation control body 30 causes radiation waves including wavelengths absorbed by the quartz member to be emitted.
- the heating efficiency of the heat insulating plate region is further improved.
- the heat radiation control function by the radiation control body 30 is provided in association with the heating heater 22, so that the structure is changed with the minimum as compared with the case of the first embodiment described above. It is possible to realize thermal radiation control. Therefore, as compared with the case where the radiation control body 30 separate from the heating heater 22 is used as in the case of the first embodiment, the cost for heat radiation control can be suppressed low, and the heat capacity of the heating structure can be suppressed. Can also be kept small.
- the radiation control body 30 may be configured to be provided directly on the heating wire (heater wire) of the heating heater 22.
- a thermal radiant zone N is formed on the surface of the heating wire 22a of the heater.
- both the surface of the heating wire 22a on the reaction tube side and the surface of the heater heat insulating material side may be covered, or the thermal radiant zone N may be formed only on the surface of the heating wire 22a on the reaction tube side.
- the temperature responsiveness at the time of raising and lowering the temperature is better than that of the additional plate material structure.
- the direct film-forming structure requires a smaller number of parts than the additional plate material structure, the parts cost and processing cost can be suppressed, and the heater can be manufactured at a relatively low cost. Further, when the film is formed on only one side facing the object to be heated and not on the other side, heat dissipation of the heater itself can be promoted and the responsiveness of the heater can be improved.
- the film formation on only one side of the heating wire 22a not only the cost reduction but also the responsiveness of the heating wire 22a itself can be expected to be improved.
- a case where a film forming process is performed on the wafer 2 is given as an example as one step of the manufacturing process of the semiconductor device, but the film type to be formed is not particularly limited.
- 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.
- the present disclosure is not limited to the film forming process, and if the process is performed by heating an object to be processed containing a semiconductor, in addition to the film forming process, heat treatment (annealing process), plasma treatment, and diffusion. It can also be applied to other substrate treatments such as treatment, oxidation treatment, nitriding treatment, and lithography treatment.
- the semiconductor manufacturing apparatus used in the semiconductor manufacturing process and the manufacturing method of the semiconductor apparatus have been described, but the present disclosure is not limited thereto, and for example, a liquid crystal display (LCD).
- LCD liquid crystal display
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Abstract
Description
内部に半導体を含む被処理体が配置される反応容器と、
熱を発する加熱部と、
前記反応容器と前記加熱部との間に配置される輻射制御体と、を備え、
前記輻射制御体は、前記加熱部からの放射熱とは異なる波長帯の輻射波を前記反応容器へ放射する技術が提供される。
半導体を含む被処理体となる半導体基板(ウエハ)としては、例えば、半導体集積回路装置が作り込まれる半導体ウエハや半導体パッケージ等が挙げられる。なお、本明細書において「ウエハ」という言葉を用いた場合は、「ウエハそのもの」を意味する場合や、「ウエハとその表面に形成された所定の層や膜等との積層体(集合体)」を意味する場合(すなわち、表面に形成された所定の層や膜等を含めてウエハと称する場合)がある。また、本明細書において「ウエハの表面」という言葉を用いた場合は、「ウエハそのものの表面(露出面)」を意味する場合や、「ウエハ上に形成された所定の層や膜等の表面、すなわち、積層体としてのウエハの最表面」を意味する場合がある。
また、ウエハに対して基板処理装置が行う処理は、ウエハを所定の温度に加熱して行う処理であればよく、例えば、酸化処理、拡散処理、イオン打ち込み後のキャリア活性化や平坦化のためのリフローやアニール、成膜処理等がある。本実施形態では、特に成膜処理を行う場合を例に挙げる。また、半導体装置を製造する装置を基板処理装置の一種である半導体製造装置という場合がある。
まず、本開示の第一実施形態について具体的に説明する。
図1に示す半導体製造装置1は、縦型の反応管としてのプロセスチューブ10を備えている。プロセスチューブ10は、例えば耐熱性材料である石英(SiO2)により、上端が閉塞し下端が開口した円筒形状に形成されている。なお、プロセスチューブ10は、内管(インナーチューブ)と外管(アウターチューブ)とを有する二重管構造のものであってもよい。
プロセスチューブ10の外側には、そのプロセスチューブ10内のウエハ2に対する加熱を行うために、加熱部(加熱機構、加熱系)としてのヒータユニット20が、プロセスチューブ10と同心円となる位置に配置されている。
石英を形成材料とする反応管(以下「石英管」ともいう。)であるプロセスチューブ10と、ヒータユニット20における加熱ヒータ22との間には、輻射制御体30が配置されている。
図2は、第一実施形態に係る半導体製造装置における輻射制御体の一構成例を模式的に示す側断面図である。
図1に示す半導体製造装置1には、上述したプロセスチューブ10、ヒータユニット20および輻射制御体30に加えて、クーリングユニット(冷却機構)が設けられている。
次に、上述した構成の半導体製造装置1における基本的な処理動作の概要を説明する。ここでは、半導体装置(半導体デバイス)の製造工程の一工程として、ウエハ2に対する成膜処理を行う場合の処理動作を例に挙げる。
続いて、上述した一連の処理動作のうち、加熱ヒータ22の発熱を利用して処理室11の内部を加熱する加熱処理について、さらに詳しく説明する。
図3は、第一実施形態に係る半導体製造装置の加熱構造による熱輻射制御の一例を模式的に示す概念図である。
次に、上述した加熱構造を構成する上で必要となる輻射制御体30の配置について、具体例を挙げてさらに詳しく説明する。
図5に示すように、保持部材32は、加熱ヒータ22からの加熱による熱膨張が生じても、吊り下げ支持する輻射制御体30が加熱ヒータ22と干渉しないように、輻射制御体30の加熱ヒータ22に対するクリアランスが設定されている。さらに詳しくは、熱輻射制御に際して高温状態(例えば700℃程度)となった場合に、プロセスチューブ10を囲うように配置された各輻射制御体30の外周径D1が熱膨張によって増大化しても、加熱ヒータ22の内周径D2に満たないように、保持部材32における各連結具33の取り付け位置が設定されている。
輻射制御体30の配置は、上述した態様に限定されることはなく、他の態様であっても構わない。
図7は、第一実施形態に係る半導体製造装置における輻射制御体の他の配置例を模式的に示す説明図(その2)である。
図8は、第一実施形態に係る半導体製造装置における輻射制御体の他の配置例を模式的に示す説明図(その3)である。
溶融石英ガラスは、溶融の熱源が酸水素炎による酸水素溶融ガラスと、電気による電気溶融ガラスと、に分類される。酸水素溶融ガラスは水が発生する酸水素炎で溶融するためガラス内部にOH基を含むが、電気溶融ガラスはOH基を含まない。
合成石英ガラスは、溶融石英ガラスよりも高純度であり、例えば、火炎加水分解反応を利用したものであれば、四塩化ケイ素(SiCl4)を直接法(ベルヌーイ法)にて加水分解して得られる直接法合成ガラスと、SiCl4をスート法(VAD法)にて加水分解して得られるVAD法合成ガラス、に分類される。VAD法合成ガラスは、直接法合成ガラスに比べ、OH基含有量が低い。
本実施形態によれば、以下に示す一つまたは複数の効果を奏する。
そのため、本実施形態によれば、プロセスチューブ10の温度を必要以上に上げることなく、ウエハ2に吸収される波長帯の輻射波を、効率的にウエハ2に到達させることが可能になる。プロセスチューブ10自体の温度上昇を抑制すれば、プロセスチューブ10が高温になることによる弊害が生じてしまうことがない。また、例えば加熱ヒータ22が抵抗加熱ヒータであっても、輻射波を効率的にウエハ2に到達させて、ウエハ2の急速昇温を実現することが可能となる。しかも、昇温後にウエハ2が設定温度となるように精密に制御することも容易に実現可能となる。
つまり、本実施形態では、輻射制御体30によって波長選択的に輻射強度を制御することで、加熱ヒータ22の低コスト化および長寿命化を図りつつ、低温域(例えば400℃未満)における昇温性能向上と中温域(例えば400℃以上650℃未満)での安定性能維持(偏差排除)とを両立させることが実現可能である。
したがって、本実施形態によれば、加熱ヒータ22からの輻射波の波長、プロセスチューブ10を透過する波長、被処理体であるウエハ2が吸収する波長がそれぞれ異なる場合であっても、そのウエハ2に対する処理を効率的かつ適切に行うことができる。
例えば、ウエハ2の配置領域36に対応する輻射制御体30bと非配置領域37に対応する輻射制御体30cとで波長特性を相違させるようにすれば、ウエハ2を効率よく加熱しつつ、例えば400℃以上の温度域でWTW、WIWの温度偏差が生じてしまうのを抑制できる。
また、例えば、ガス供給路に対応する箇所に配される輻射制御体30dとそれ以外の箇所に配される輻射制御体30eとで波長特性を相違させるようにすれば、ガス供給路を流れるガスの予備加熱を行うことができ、そのガスを利用したウエハ2に対する処理の効率化および適切化を図ることが実現可能になる。
次に、本開示の第二実施形態について具体的に説明する。ここでは、主として、上述した第一実施形態との相違点を説明する。
図10は、第二実施形態に係る半導体製造装置の概略構成例を模式的に示す側断面図である。
以上に、本開示の実施形態を具体的に説明したが、本開示が上述の各実施形態に限定されることはなく、その要旨を逸脱しない範囲で種々変更することが可能である。
(1)成膜された板自体が発熱して昇温するため、間接加熱の板材追加構造と比較して昇温速度が速くなる。
(2)板材分の部材が無くなるため、その分の熱容量が小さくなる。その結果、板材追加構造と比較して昇温・降温時の温度応答性が良い。
(3)直接成膜構造は板材追加構造と比較して部品点数が少なくて済むため、部品代および加工費が抑えられ、比較的安価にヒータを製作することができる。
また、加熱対象物に面した片面のみに成膜し、反対面には成膜しない場合には、ヒータ自体の放熱を促進させ、ヒータの応答性向上させることができる。発熱線22aの片面のみの成膜に関しては、単に原価低減というだけでなく、発熱線22a自体の応答性向上が期待できる。
Claims (14)
- 内部に半導体を含む被処理体が配置される反応容器と、
熱を発する加熱部と、
前記反応容器と前記加熱部との間に配置される輻射制御体と、を備え、
前記輻射制御体は、前記加熱部からの放射熱とは異なる波長帯の輻射波を前記反応容器へ放射するように構成されている
半導体装置の製造装置。 - 前記輻射制御体は、前記反応容器と前記加熱部との間に介在する短冊型の板状体として形成されている
請求項1に記載の半導体装置の製造装置。 - 前記輻射制御体を吊り下げ支持する保持部材を備える
請求項2に記載の半導体装置の製造装置。 - 前記保持部材は、前記反応容器に対応する形状の環状部分を有しており、
前記環状部分に吊り下げ支持される複数の前記輻射制御体が前記反応容器の周囲を囲うように配置される
請求項3に記載の半導体装置の製造装置。 - 前記輻射制御体は、前記反応容器と前記加熱部との間において、前記反応容器との距離よりも前記加熱部との距離が近くなるように配置される
請求項4に記載の半導体装置の製造装置。 - 前記保持部材は、前記加熱部からの加熱による熱膨張が生じても前記輻射制御体が前記加熱部と干渉しないように、前記輻射制御体の前記加熱部に対するクリアランスが設定されている
請求項5に記載の半導体装置の製造装置。 - 前記反応容器と前記加熱部との間に冷却ガスを導入する導入部と、導入された前記冷却ガスを排気する排気部と、を有して構成されたクーリングユニットを備える
請求項1に記載の半導体装置の製造装置。 - 前記クーリングユニットは、前記冷却ガスが前記反応容器の外周面近傍を前記反応容器に沿って流れるように、前記導入部および前記排気部が配置されている
請求項7に記載の半導体装置の製造装置。 - 前記輻射制御体は、短冊型の長手方向が前記反応容器の管長より短尺に形成されており、
前記保持部材は、前記反応容器の管長方向に沿って複数段が配置されており、
各段の前記保持部材が前記輻射制御体を吊り下げ支持することで複数の前記輻射制御体が前記反応容器の管長方向に並んで配置される
請求項3に記載の半導体装置の製造装置。 - 前記輻射制御体は、前記加熱部の発熱面を覆うように前記加熱部に取り付けられている
請求項1に記載の半導体装置の製造装置。 - 複数の前記輻射制御体は、配置箇所に応じて前記反応容器へ放射する輻射波の波長特性が相違するように構成されている
請求項4または9に記載の半導体装置の製造装置。 - 前記反応容器内に前記被処理体の配置領域と非配置領域とが形成されており、
複数の前記輻射制御体は、前記配置領域に対応する段に吊り下げ支持される前記輻射制御体と、前記非配置領域に対応する段に吊り下げ支持される前記輻射制御体とで、前記反応管へ放射する輻射波の波長特性が相違するように構成されている
請求項9に記載の半導体装置の製造装置。 - 前記反応容器内にガス供給路が形成されており、
複数の前記輻射制御体は、前記ガス供給路に対応する箇所に配される前記輻射制御体と、それ以外の箇所に配される前記輻射制御体とで、前記反応容器へ放射する輻射波の波長特性が相違するように構成されている
請求項4に記載の半導体装置の製造装置。 - 半導体を含む被処理体を反応容器の内部に配置する工程と、
前記反応容器に対して熱を発する加熱部を用い、前記反応容器と前記加熱部との間に輻射制御体を介在させた状態で、前記反応容器内の前記被処理体を加熱する工程と、を備え、
前記輻射制御体は、前記加熱部からの放射熱とは異なる波長帯の輻射波を前記反応容器へ放射する
半導体装置の製造方法。
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JP2005093911A (ja) * | 2003-09-19 | 2005-04-07 | Hitachi Kokusai Electric Inc | 基板処理装置 |
WO2017163314A1 (ja) * | 2016-03-22 | 2017-09-28 | 株式会社日立国際電気 | 基板処理装置、半導体装置の製造方法および記録媒体 |
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