WO2020261466A1 - 断熱構造体、基板処理装置および半導体装置の製造方法 - Google Patents
断熱構造体、基板処理装置および半導体装置の製造方法 Download PDFInfo
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- WO2020261466A1 WO2020261466A1 PCT/JP2019/025525 JP2019025525W WO2020261466A1 WO 2020261466 A1 WO2020261466 A1 WO 2020261466A1 JP 2019025525 W JP2019025525 W JP 2019025525W WO 2020261466 A1 WO2020261466 A1 WO 2020261466A1
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- Prior art keywords
- heat insulating
- heat
- lid
- processing container
- heater
- Prior art date
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Images
Classifications
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- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
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- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67098—Apparatus for thermal treatment
- H01L21/67109—Apparatus for thermal treatment mainly by convection
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- F27D1/0033—Linings or walls comprising heat shields, e.g. heat shieldsd
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
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- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
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- C23C16/458—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber
- C23C16/4582—Rigid and flat substrates, e.g. plates or discs
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/46—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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
- F27B17/0016—Chamber type furnaces
- F27B17/0025—Especially adapted for treating semiconductor wafers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D5/00—Supports, screens, or the like for the charge within the furnace
- F27D5/0037—Supports specially adapted for semi-conductors
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- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/0217—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon nitride not containing oxygen, e.g. SixNy or SixByNz
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
- H01L21/02271—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
- H01L21/0228—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition deposition by cyclic CVD, e.g. ALD, ALE, pulsed CVD
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—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
- H01L21/324—Thermal treatment for modifying the properties of semiconductor bodies, e.g. annealing, sintering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
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- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/673—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere using specially adapted carriers or holders; Fixing the workpieces on such carriers or holders
- H01L21/67303—Vertical boat type carrier whereby the substrates are horizontally supported, e.g. comprising rod-shaped elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—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 for supporting or gripping
- H01L21/687—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68792—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by the construction of the shaft
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/023—Industrial applications
- H05B1/0233—Industrial applications for semiconductors manufacturing
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/42—Heating elements having the shape of rods or tubes non-flexible
- H05B3/44—Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/62—Heating elements specially adapted for furnaces
Definitions
- the present disclosure relates to a method for manufacturing a heat insulating structure, a substrate processing device, and a semiconductor device.
- a vertical substrate processing apparatus is used in the heat treatment of a substrate (wafer) in the manufacturing process of a semiconductor device (device).
- a substrate wafer
- a semiconductor device device
- the vertical substrate processing apparatus a plurality of substrates are arranged and held in a vertical direction by a substrate holder, and the substrate holder is carried into the processing chamber.
- the processing gas is introduced into the processing chamber while the substrate is heated by the heater installed outside the processing chamber, and the substrate is subjected to a thin film forming treatment or the like.
- the sub-heater when the sub-heater is provided in this way, it takes time to stabilize the temperature of the processing chamber unless the temperature rise by the sub-heater follows the main heater. Further, since the sub-heater heats the center of the substrate, the temperature distribution in the substrate surface may become non-uniform.
- An object of the present disclosure is to provide a technique for improving the heat insulating performance at the lower part of the treatment chamber and shortening the temperature stabilization time in the treatment chamber.
- a heat insulating structure placed near the furnace opening with a temperature gradient of the heat treatment furnace has a metal heat shield and a quartz or ceramic sealing member that covers the front and back surfaces of the heat shield, and the heat shield is placed in a vacuum cavity formed inside the sealing member. Equipped with multiple arranged heat insulating plates, Provided is a technique having a heat insulating structure in which the plurality of heat insulating plates are arranged at intervals from each other.
- a technique capable of improving the heat insulating performance at the lower part of the processing chamber and shortening the temperature stabilization time in the processing chamber is provided.
- FIG. 1 It is a schematic block diagram of the vertical furnace of the substrate processing apparatus preferably used in embodiment of this disclosure, and is the figure which shows the inside of the furnace in the vertical sectional view. It is a vertical cross-sectional view which shows the cap heater of the substrate processing apparatus preferably used in the embodiment of this disclosure, and the peripheral part thereof. It is a perspective view which shows the cap heater of the substrate processing apparatus preferably used in embodiment of this disclosure.
- (A) and (B) are perspective views for explaining the heat insulating structure of the substrate processing apparatus preferably used in the embodiment of the present disclosure.
- (A) is a top view showing a heat insulating plate constituting a heat insulating structure preferably used in the embodiment of the present disclosure
- (B) is a top view of a substrate processing apparatus preferably used in the embodiment of the present disclosure. It is a vertical sectional view which shows the heat insulating plate.
- (A) and (B) are vertical cross-sectional views for explaining the structure of the heat insulating plate preferably used in the embodiment of the present disclosure.
- It is a schematic block diagram of the controller of the substrate processing apparatus preferably used in embodiment of this disclosure, and is the figure which shows the control system of the controller by the block diagram.
- the substrate processing apparatus 1 is configured as a vertical heat treatment apparatus that carries out a heat treatment step in manufacturing a semiconductor integrated circuit, and includes a furnace 2.
- the furnace 2 is a cylindrical electric furnace, and is supported by a heater base 2A as a holding plate, so that the furnace 2 is installed perpendicularly to the installation floor of the substrate processing device 1.
- a heater 3 as a first heater is provided on the inner surface side of the furnace 2 in order to uniformly heat the inside of the furnace.
- the heater 3 also functions as an activation mechanism (excitation portion) for activating (exciting) the gas with heat as described later.
- a reaction tube 4 constituting a reaction vessel (processing vessel) is arranged inside the furnace 2, a reaction tube 4 constituting a reaction vessel (processing vessel) is arranged.
- the reaction tube 4 is made of a heat-resistant material such as quartz (SiO 2 ) that transmits infrared rays or silicon carbide (SiC) that is close to a black body, and is formed in a cylindrical shape with the upper end closed and the lower end open.
- the outside of the reaction tube 4 is formed so as to project outward so that the gas supply space (supply duct) 4A and the gas exhaust space (exhaust duct) 4B face each other.
- a flange portion 4C protruding outward is formed at the lower end of the reaction tube 4.
- the flange portion 4C is connected to the manifold 5 which is a mating member on the lid 19 side via an O-ring 5A as a sealing member.
- a processing chamber 6 is formed in the hollow portion of the reaction tube 4.
- the processing chamber 6 is configured to accommodate the wafer 7 by a boat 21 described later.
- the processing chamber 6, the gas supply space 4A, and the gas exhaust space 4B are separated by a reaction tube 4 (inner wall).
- the manifold 5 has a cylindrical shape and is made of metal, and is provided so as to support the lower end of the reaction tube 4.
- the inner diameter of the manifold 5 is formed to be larger than the inner diameter of the reaction tube 4 (the inner diameter of the flange portion 4C).
- an annular space described later can be formed between the lower end (flange portion 4C) of the reaction tube 4 and the lid 19 provided at the lower end (one end) of the reaction tube 4.
- One or more nozzles 8 are provided in the gas supply space 4A.
- a gas supply pipe 9 for supplying a processing gas (raw material gas) is connected to the nozzle 8 through the manifold 5.
- a mass flow controller (MFC) 10 which is a flow rate controller and a valve 11 which is an on-off valve are provided in order from the upstream direction.
- the gas supply pipe 12 for supplying the inert gas is connected to the gas supply pipe 9.
- the gas supply pipe 12 is provided with an MFC 13 and a valve 14 in this order from the upstream direction.
- the gas supply pipe 9, the MFC 10, and the valve 11 mainly constitute a processing gas supply unit that is a processing gas supply system.
- gas supply pipe 12, the MFC 13, and the valve 14 constitute an inert gas supply unit which is an inert gas supply system. Further, the gas supply pipe 12, the MFC 13, and the valve 14 may be included in the processing gas supply unit (processing gas supply system).
- the nozzle 8 is provided in the gas supply space 4A so as to rise from the lower part of the reaction tube 4.
- One or a plurality of gas supply holes 8A for supplying gas are provided on the side surface and the upper end of the nozzle 8.
- the gas supply hole 8A opened so as to face the center of the reaction tube 4 can inject gas toward the wafer 7.
- horizontally long supply slits 4E are provided in a plurality of steps in the vertical direction at intervals corresponding to the wafer 7.
- a plurality of horizontally long exhaust slits 4F as the first exhaust portion (first exhaust port) are provided in the vertical direction so as to correspond to the supply slit 4E.
- An exhaust port 4D communicating with the gas exhaust space 4B is formed near the lower end of the reaction tube 4.
- An exhaust pipe 15 for exhausting the atmosphere in the processing chamber 6 is connected to the exhaust port 4D.
- An exhaust port 4G is formed on the inner wall below the gas exhaust space 4B (the wall between the gas exhaust space 4B and the processing chamber 6).
- the flange portion 4C is also formed with an exhaust port 4H for communicating the processing chamber 6 and the lower end of the gas exhaust space 4B.
- the exhaust ports 4G and 4H mainly function to exhaust the purge gas described later.
- the exhaust pipe 15 is provided with a pressure sensor 16 as a pressure detector (pressure gauge) for detecting the pressure in the processing chamber 6 and an APC (AutoPressure Controller) valve 17 as a pressure regulator (pressure regulator).
- a vacuum pump 18 as a vacuum exhaust device is connected.
- the APC valve 17 can perform vacuum exhaust and vacuum exhaust stop in the processing chamber 6 by opening and closing the valve while the vacuum pump 18 is operating. Further, the pressure in the processing chamber 6 can be adjusted by adjusting the valve opening degree based on the pressure information detected by the pressure sensor 16 while the vacuum pump 18 is operated. ..
- the exhaust system is mainly composed of the exhaust pipe 15, the APC valve 17, and the pressure sensor 16.
- the vacuum pump 18 may be included in the exhaust system.
- a lid 19 is provided as a furnace palate body that can airtightly close the lower end opening of the manifold 5.
- the lid 19 is made of a metal such as stainless steel or a nickel-based alloy, and is formed in a disk shape.
- An O-ring 19A as a sealing member that comes into contact with the lower end of the manifold 5 is provided on the upper surface of the lid 19.
- a cover plate 20 for protecting the lid 19 is installed on the upper surface of the lid 19 inside the bottom flange of the manifold 5.
- the cover plate 20 is made of a heat-resistant and corrosion-resistant material such as quartz, sapphire, or SiC, and is formed in a disk shape. Since the cover plate 20 does not require mechanical strength, it can be formed with a thin wall thickness.
- the cover plate 20 is not limited to the parts prepared independently of the lid 19, and may be a thin film or a layer of nitride or the like coated on the inner surface of the lid 19 or the inner surface is modified.
- the cover plate 20 may also have a wall that rises from the circumferential edge along the inner surface of the manifold 5.
- the boat 21 as a substrate holder supports a plurality of wafers 7, for example, 25 to 200 wafers 7, in a horizontal posture and in a state of being centered on each other by vertically aligning them in multiple stages. There, the wafers 7 are arranged at regular intervals.
- the boat 21 is made of a heat resistant material such as quartz or SiC. It may be desirable for the reaction tube 4 to have a minimum inner diameter that allows the boat 21 to be safely loaded and unloaded.
- a heat insulating structure 22 is arranged at a position in the processing chamber 6 below the boat 21 to which the exhaust pipe 15 is connected.
- the heat insulating structure 22 has a structure in which heat conduction or transfer in the vertical direction is reduced, and usually has a cavity inside. Further, as will be described in detail later, the heat insulating structure 22 has a structure that does not allow radiant heat from above to escape to the lower part of the reaction tube 4. Further, the inside of the heat insulating structure 22 can be purged by the purge gas.
- a rotation mechanism 23 for rotating the boat 21 is installed on the side of the lid 19 opposite to the processing chamber 6.
- a gas supply pipe 24 for purge gas is connected to the rotation mechanism 23.
- the gas supply pipe 24 is provided with an MFC 25 and a valve 26 in this order from the upstream direction, and these mainly form a purge gas supply unit.
- One purpose of this purge gas is to protect the inside of the rotating mechanism 23 (for example, a bearing) from the corrosive gas used in the processing chamber 6.
- the purge gas is discharged from the rotating mechanism 23 along the shaft and guided into the heat insulating structure 22.
- the boat elevator 27 is provided vertically below the outside of the reaction tube 4 and operates as an elevating mechanism (conveying mechanism) for raising and lowering the lid 19. As a result, the boat 21 and the wafer 7 supported by the lid 19 are carried in and out of the processing chamber 6.
- a temperature detector 28 is installed on the outer wall of the reaction tube 4.
- the temperature detector 28 may be composed of a plurality of thermocouples arranged one above the other. By adjusting the degree of energization of the heater 3 based on the temperature information detected by the temperature detector 28, the temperature in the processing chamber 6 becomes a desired temperature distribution.
- the controller 29 is a computer that controls the entire substrate processing device 1, and serves as MFCs 10, 13, 25, valves 11, 14, 26, a pressure sensor 16, an APC valve 17, a vacuum pump 18, a heater 3, and a second heater described later. It is electrically connected to a cap heater 34, a temperature detector 28, a rotation mechanism 23, a boat elevator 27, etc., which are sub-heaters of the above, and receives signals from them and controls them.
- FIG. 2 shows a cross section of the heat insulating structure 22 and the rotating mechanism 23.
- the rotating mechanism 23 includes a casing (body) 23A formed in a substantially cylindrical shape with an upper end open and a lower end closed, and the casing 23A is bolted to the lower surface of the lid 19.
- a cylindrical inner shaft 23B and an outer shaft 23C formed in a cylindrical shape having a diameter larger than the diameter of the inner shaft 23B are coaxially provided in this order from the inside.
- the outer shaft 23C is formed by a pair of upper and lower inner bearings 23D and 23E interposed between the inner shaft 23B and a pair of upper and lower outer bearings 23F and 23G interposed between the casing 23A. It is bearing freely.
- the inner shaft 23B is fixed to the casing 23A and cannot rotate.
- a worm wheel or pulley 23K driven by an electric motor (not shown) or the like is mounted on the outer shaft 23C.
- a sub-heater support column 33 is vertically inserted inside the inner shaft 23B.
- the sub-heater support column 33 is a quartz pipe, and at the upper end thereof, concentrically holds a cap heater 34 as a sub-heater that heats the wafer 7 from below in the processing chamber 6.
- the sub-heater support column 33 is supported by a support portion 23N formed of heat-resistant resin at the upper end position of the inner shaft 23B. Further below, the sub-heater support column 33 is sealed between its outer surface and the inner shaft 23B via an O-ring by a vacuum joint 23P connected to the inner shaft 23B or the casing 23A.
- a cylindrical rotating shaft 36 having a flange at the lower end is fixed to the upper surface of the outer shaft 23C formed in a flange shape.
- the sub-heater support column 33 penetrates the cavity of the rotating shaft 36.
- a disk-shaped rotating table 37 having a through hole for passing through the sub-heater support column 33 is fixed to the cover plate 20 at a predetermined interval.
- the turntable 37 is made of a metal such as stainless steel.
- a heat insulating plate holder 38 for holding a plurality of heat insulating plates 40 and a cylindrical cover (cap) 39 are concentrically placed and fixed by screws or the like.
- the cap heater 34 is installed below the boat 21 and closer to the lid 19 than the boat 21 to heat the inside of the reaction tube 4.
- the cap heater 34 is formed in a torus shape having a diameter smaller than the diameter of either the wafer 7 or the cover 39, and is connected and supported by the sub-heater support column 33 so as to be parallel to the wafer 7. Has been done. Inside them, heater strands constituting a heating element 34B, which is a coiled resistance heating element, are inserted.
- the heating element 34B is formed of, for example, an Fe—Cr—Al alloy, molybdenum disilicate, tungsten, or the like.
- the cap heater 34 has an independent lead wire and can be independently energized.
- the cap heater 34 is arranged near the upper end in the heat insulating structure 22. Further, a plurality of heat insulating plates 40 are arranged below the cap heater 34. Then, the cap heater 34 heats the upper surface of the cover 39, the heat insulating plate 40A, and the wafer 7 (bottom wafer) at the bottom of the boat 21 around the cover 39.
- the cap heater 34 is heated so as to compensate for heat escape from the furnace port to make the heat insulating structure 22 have extremely high apparent heat insulating properties, and to make the in-plane temperature distribution of the bottom wafer uniform. It fulfills two functions.
- the former contributes to temperature uniformity between the wafers 7. By performing this heating in the temperature raising process, it is possible to approach the temperature distribution (temperature gradient distribution) in the temperature-stabilized steady state, and the temperature control of the heater 3 converges quickly.
- a heat absorber 56 having a predetermined emissivity is provided on the upper surface of the flange portion 4C, that is, the surface opposite to the manifold 5.
- the heat absorber 56 preferably has at least a partial wavelength range between the peak wavelength of blackbody radiation at the heat resistant temperature of the O-ring 5A and the peak wavelength of blackbody radiation at the central temperature of the reaction tube 4. It has an emissivity close to 1 (that is, close to a blackbody).
- the heat absorber 56 absorbs radiant heat in the vicinity of the flange portion 4C before the light incident on the inside of the reaction tube 4 reaches the O-ring 5A due to multiple reflections or the like.
- the heat absorber 56 is preferably in close contact with the flange portion 4C and can be formed as a thin sheet having elasticity.
- the heat absorber 56 may be sandwiched as a cushion between the backing plate (not shown) that presses the flange portion 4C against the manifold 5 and the flange portion 4C.
- a heat insulating cloth 51 is installed on the outer peripheral surface of the reaction tube 4 between the end of the furnace 2 on the lid 19 side and the lid 19 above the flange portion 4C.
- a heat shield sheet 53 is wrapped around the outside of the heat insulating cloth 51.
- the heat insulating cloth 51 and the heat shield sheet 53 can prevent the invasion of radiant heat from the outside to the inside of the reaction tube 4 and stabilize the temperature inside the furnace. This is useful when other reaction tubes 4 that can operate at different temperatures are located adjacent to each other.
- heat escape in the furnace at a place where the temperature tends to drop, such as a bottom wafer can be prevented, heat insulation performance can be improved, and the temperature stabilization time can be shortened.
- the heat shield sheet 53 is a metal sheet having a high reflectance (low emissivity) such as molybdenum (Mo). If the surface of the sheet is flat like a mirror surface, the vertical emissivity can be reduced.
- the sheet may be a laminate of a metal film having a thickness that does not transmit infrared rays and a resin film. The sheet may be wound more than once.
- the heat insulating structure 22 is composed of a heat insulating holder 38, a cover 39, and a plurality of heat insulating plates 40, and is placed on a turntable 37.
- the heat insulating structure 22 is arranged in the processing chamber 6 between the boat 21 and the lid 19 in the vicinity of the furnace opening with a temperature gradient. More specifically, it is preferable that the back end of the reaction tube 4 of the heat insulating structure 22 is arranged on the back side of the reaction tube 4 rather than the end on the lid 19 side of the furnace 2.
- the heat insulating plate holder 38 is configured in a cylindrical shape having a cavity in the center through which the sub-heater support column 33 penetrates.
- the heat insulating plate holder 38 is provided substantially coaxially with the arrangement axis of the heat insulating plate 40, and holds a plurality of disk-shaped heat insulating plates 40.
- the cylindrical portion 38A of the heat insulating plate holder 38 is provided with a plurality of collar-shaped holding portions 38D for holding the heat insulating plate 40.
- a foot 38C having an outward flange shape is provided at the lower end of the heat insulating plate holder 38. The foot 38C abuts on the turntable 37 at its lower end.
- the heat insulating holder 38 may be made of a heat resistant material such as quartz.
- a plurality of heat insulating plates 40 are arranged on the heat insulating plate holder 38 at intervals from each other. That is, in the heat insulating structure 22, a plurality of heat insulating plates 40 are arranged at intervals from each other.
- the upper end of the heat insulating body holder 38 is opened so that the sub-heater support column 33 protrudes from the upper end, and constitutes the purge gas supply port 38B.
- a first flow path having an annular cross section is formed between the heat insulating plate holder 38 and the sub-heater support column 33 as a purge gas supply path for supplying purge gas to the upper part of the heat insulating structure 22.
- the purge gas supplied from the supply hole 38B flows downward through the second flow path, which is the space between the heat insulating plate holder 38 and the inner wall of the cover 39, and is provided from a plurality of exhaust holes 22A at the lower end of the cover 39. It is exhausted to the outside of the cover 39.
- the upper end of the cover 39 is closed by a flat plate, and the boat 21 is installed there.
- the upper end of the cover 39 is formed in a convex shape.
- a step is formed on the outer circumference of the upper surface of the cover 39 over the entire circumference, and the ring-shaped bottom plate of the boat 21 is fitted to this step.
- the load of the boat 21 is not applied to the portion above the step on the upper surface of the cover 39, it can be formed into an arbitrary shape with a thin wall thickness, for example, molding or opacity for adjusting the heating amount of the bottom wafer. Can be applied.
- the cover 39 is made of quartz or ceramics, is provided substantially coaxially with the arrangement axis of the heat insulating plate 40, and is configured to cover the side surfaces and the upper surface of the plurality of heat insulating plates 40. Further, a tubular side heat shield material 54 is embedded in the side surface of the cover 39.
- the side heat shield 54 is formed in, for example, a sheet shape. Specifically, there are metal sheets such as molybdenum (Mo) sheet and platinum (sheet), and ceramic sheets such as alumina (AlO) and zirconia (ZrO). Preferably, it is composed of a Mo sheet. More preferably, the surface of the side heat shield 54 is formed as a mirror surface. By forming the surface into a mirror surface, the reflectance can be improved and the heat shielding effect can be improved.
- the heat insulating plate 40A and the heat insulating plate 40B are coaxially installed on the holding portion 38D of the heat insulating plate holder 38 as the heat insulating plate 40.
- the heat insulating plate 40A and the heat insulating plate 40B are held by the heat insulating plate holder 38 at predetermined intervals.
- the heat insulating plate 40A is held on the side where the cap heater 34, which is the uppermost stage of the heat insulating plate holder 38, is arranged, and the heat insulating plate 40B is held below the cap heater 34.
- a long hole-shaped notch 40C is cut in the heat insulating plate 40B in the radial direction.
- the width of the notch 40C is smaller than the outer diameter of the holding portion 38D so as to be held by the holding portion 38D of the heat insulating plate holder 38, and the cylindrical portion 38A of the cylindrical portion 38A can escape the cylindrical portion 38A of the heat insulating plate holder 38. It is set to be slightly larger than the outer diameter, and the length of the notch 40C is set to be longer than the radius of the heat insulating plate 40B by the width.
- the cutout portions 40C of the heat insulating plate 40B of each stage are displaced from each other in the circumferential direction so as not to overlap each other.
- the notch 40C of the heat insulating plate 40B of each stage is shifted in the circumferential direction in this way, the adverse effect of the notch 40C of the heat insulating plate 40B of each stage is reduced.
- the through holes 50A (described later) in each stage are not arranged in a straight line, the light rays transmitted through the through holes 50A are easily reflected by the heat insulating plate 40B in the lower stage, and the heat insulating property is improved.
- a hole 40D is formed in the center of the heat insulating plate 40A.
- the diameter of the hole 40D is set smaller than the outer diameter of the holding portion 38D so as to be held by the holding portion 38D of the heat insulating plate holder 38.
- the heat insulating plates 40A and 40B are formed in a disk shape having a diameter smaller than the diameter of the wafer 7 and larger than the outer diameter of the cap heater 34 (for example, 1.5 times or more) so as to be accommodated in the cover 39. ..
- the heat insulating plates 40A and 40B form an appropriate vertical temperature gradient in the heat insulating structure 22.
- the heat insulating plate 40A reflects the radiant heat from the heater 3 and the cap heater 34, traps the heat above the heat insulating plate 40A in place, and disperses the in-plane temperature distribution of the wafer 7 placed at the bottom of the boat 21. It also plays a role in flattening.
- the number of heat insulating plates 40B is set to be equal to or greater than the number of heat insulating plates 40A.
- the heat insulating plate 40A reflects the radiant heat from the cap heater 34 to insulate.
- the temperature responsiveness of the wafer 7 can be improved by reflecting the light rays radiated or transmitted from the heat insulating plates 40A and 40B above by the heat insulating plate 40B at a distance from the wafer 7 to insulate the wafer 7.
- the temperature rise time can be shortened.
- the number and arrangement of the heat insulating plate 40A and the heat insulating plate 40B are not limited to the above, and can be optimized so as to minimize the heat flux passing through the heat insulating structure 22.
- FIGS. 5 (A), 5 (B), and 6 (A) take the heat insulating plate 40B as an example.
- FIG. 6 (B). 6 (A) and 6 (B) are vertical cross-sectional views schematically showing a part of the heat insulating plate 40B.
- the heat insulating plate 40B is composed of a heat insulating material 50 and a pair of sealing plates 52A and 52B.
- the sealing plates 52A and 52B have a disk shape having the same diameter, and jointly serve as a sealing member.
- the heat shield material 50 is thinner than any of the sealing plates 52A and 52B, and is set to be slightly smaller than the outer diameters of the sealing plates 52A and 52B.
- the heat shield material 50 is formed in a sheet shape, for example. Specifically, there are metal sheets such as molybdenum (Mo) sheet and platinum (sheet), and ceramic sheets such as alumina (AlO) and zirconia (ZrO). Preferably, it is composed of a Mo sheet. More preferably, the surface of the heat shield 50 is formed as a mirror surface. By forming the surface into a mirror surface, the reflectance can be improved and the heat shielding effect can be improved. Further, the heat shield material 50 is formed with a plurality of square through holes 50A for communicating between the front and back surfaces. The through hole 50A may have a circular shape.
- the sealing plates 52A and 52B are made of a heat-resistant and corrosion-resistant material made of quartz or ceramics, and have rigidity that does not bend under their own weight and strength that can withstand a pressure difference of 1 atm or more.
- protrusions 58A and 58B having the same shape as the through hole 50A and slightly smaller than the through hole 50A are formed at the corresponding positions of the through hole 50A of the heat shield material 50, respectively.
- at least one of the sealing plates 52A and 52B is provided with side walls 59A and 59B having the same height as the protrusions 58A and 58B over the entire circumference of the edge including the notch 40C.
- the protrusions 58A and 58B are aligned with each other and arranged regularly (for example, in a grid pattern), and the formation density thereof can be selected from 0.1 to 10 cm- 2 .
- the heat insulating plate 40B is formed so that a pair of sealing plates 52A and 52B sandwich the heat shield material 50. Specifically, in the heat insulating plate 40B, any of the protrusions 58A and 58B of the sealing plates 52A and 52B is inserted through the through hole 50A, and heat treatment is performed while drawing a vacuum to join the side walls 59A. 59B and protrusions 58A and 58B are joined to each other to form. At this time, the heat shield material 50 does not need to be welded to the sealing plates 52A and 52B, and vacuum heat insulating layers may be formed on both surfaces thereof.
- Heat treatment welding
- laser welding vacuum bonding
- vacuum bonding or the like can be used for bonding the pair of sealing plates 52A and 52B to be integrated. Further, it may be evacuated after welding, in which case a thin tube for sealing projects vertically on either of the sealing plates 52A and 52B and remains as a navel even after sealing.
- the stacking interval is at least twice the height of the navel, the orientation of the notch 40C of the adjacent heat insulating plate 40B is aligned with the position of the navel to make contact with the navel. Can be avoided.
- the heat shield material 50 is arranged in the vacuum cavity 60 formed between the pair of sealing plates 52, and the pillar 60 bridges between the pair of sealing plates 52 in the cavity 60. Is arranged in a predetermined pattern to maintain strength.
- the surfaces of the sealing plates 52A and 52B can be mirror-finished or sufficiently optically flat by fire polishing or the like, and the inside can be transparent or opaque. When opaque by air bubbles or the like, the intensity is lowered, but the heat flux due to the transmission and conduction of radiation can be reduced.
- the outer surface of the heat insulating plate 40B can be made a sandblast surface or the inside can be made opaque only in these parts.
- the heat shield material 50 can come into contact with the sealing plates 52A and 52B at points without being adhered to each other on the surface.
- the heat shield material 50 embossed on both sides is supported by the sealing plate 52B, which is the bottom of the cavity 60, by point contact with the tips of the downward protrusions.
- a vacuum cavity is formed inside the heat insulating plate 40A and the side surface of the cover 39, and the heat shield material 50 or the side heat shield material 54 is arranged in each cavity.
- the heat insulating plate 40 in which the vacuum cavity 60 is formed inside and the heat shield material 50 is provided in the cavity 60 has heat in the thickness direction as compared with the heat insulating plate in which the cavity 60 is not formed inside. Since conduction is suppressed, the heat insulating performance per sheet is improved. Further, by providing the side heat insulating material 54 on the side surface of the cover 39, the heat insulating property inside and outside the heat insulating structure 22 is enhanced, and the heat insulating property between the heat insulating plates 40 is also improved by reducing the view factor. Further, the portion of the side heat shield material 54 above the heat insulating plate 40A can reflect radiant heat from the cap heater 34 and reflect it on the wafer 7 without escaping to the lower part of the processing chamber 6.
- the controller 29 includes MFC10, 13, 25, valves 11, 14, 26, pressure sensor 16, APC valve 17, vacuum pump 18, heater 3, cap heater 34, temperature detector 28, and rotation mechanism. 23, is electrically connected to each configuration of the boat elevator 27 and the like, and automatically controls them.
- the controller 29 is configured as a computer including a CPU (Central Processing Unit) 212, a RAM (Random Access Memory) 214, a storage device 216, and an I / O port 218.
- the RAM 214, the storage device 216, and the I / O port 218 are configured so that data can be exchanged with the CPU 212 via the internal bus 220.
- the I / O port 218 is connected to each of the above configurations.
- An input / output device 222 with, for example, a touch panel or the like is connected to the controller 29.
- the storage device 216 is composed of, for example, a flash memory, an HDD (Hard Disk Drive), or the like.
- a control program for controlling the operation of the substrate processing device 1 and a program for causing each configuration of the substrate processing device 1 to execute a film forming process or the like according to processing conditions (process recipe, cleaning recipe, etc.) Recipe) is stored readable.
- the RAM 214 is configured as a memory area (work area) in which programs, data, and the like read by the CPU 212 are temporarily held.
- the CPU 212 reads and executes the control program from the storage device 216, reads the recipe from the storage device 216 in response to the input of the operation command from the input / output device 222, and controls each configuration according to the recipe.
- the controller 29 is configured by installing the above-mentioned program continuously stored in an external storage device (for example, a semiconductor memory such as a USB memory or a memory card, an optical disk such as a CD or a DVD, or an HDD) 224 in a computer.
- an external storage device for example, a semiconductor memory such as a USB memory or a memory card, an optical disk such as a CD or a DVD, or an HDD
- the storage device 216 and the external storage device 224 are configured as tangible media that can be read by a computer. Hereinafter, these are collectively referred to simply as a recording medium.
- the program may be provided to the computer by using a communication means such as the Internet or a dedicated line without using the external storage device 224.
- hexachlorodisilane (HCDS) gas is provided as the first processing gas (raw material gas) from the nozzle 8a
- ammonia (NH 3 ) is used as the second processing gas (reaction gas) from the nozzle 8b.
- HCDS hexachlorodisilane
- NH 3 ammonia
- SiN silicon nitride
- a step of supplying HCDS gas to the wafer 7 in the processing chamber 6, a step of removing HCDS gas (residual gas) from the processing chamber 6, and a wafer in the processing chamber 6 By repeating the step of supplying NH 3 gas to 7 and the step of removing NH 3 gas (residual gas) from the inside of the processing chamber 6 a predetermined number of times (one or more times), a SiN film is formed on the wafer 7. Form.
- this film formation sequence is described as follows for convenience:
- Vacuum exhaust (decompression exhaust) is performed by the vacuum pump 18 so that the inside of the processing chamber 6, that is, the space where the wafer 7 exists has a predetermined pressure (vacuum degree).
- the pressure in the processing chamber 6 is measured by the pressure sensor 16, and the APC valve 17 is feedback-controlled based on the measured pressure information.
- the supply of purge gas into the cover 39 and the operation of the vacuum pump 18 are maintained at least until the processing on the wafer 7 is completed.
- the temperature rise in the processing chamber 6 is started.
- the degree of energization of the heater 3 and the cap heater 34 is feedback-controlled based on the temperature information detected by the temperature detector 28 so that the processing chamber 6 has a predetermined temperature distribution suitable for film formation.
- the heating in the processing chamber 6 by the heater 3 and the cap heater 34 is continuously performed at least until the processing (deposition) on the wafer 7 is completed.
- the energization period of the cap heater 34 does not need to coincide with the heating period of the heater 3. For example, it is desirable that the temperature of the cap heater 34 reaches the same temperature as the film forming temperature and the inner surface temperature of the manifold 5 reaches 180 ° C.
- the life of the O-ring 19A can be extended.
- the rotation mechanism 23 starts the rotation of the boat 21 and the wafer 7.
- the rotation mechanism 23 rotates the boat 21 via the rotation shaft 36, the turntable 37, and the cover 39, so that the cap heater 34 rotates the wafer 7 without rotating it. This reduces uneven heating.
- the rotation of the boat 21 and the wafer 7 by the rotation mechanism 23 is continuously performed at least until the processing on the wafer 7 is completed.
- Step 1 When the temperature in the processing chamber 6 stabilizes at the preset processing temperature, steps 1 to 4 are repeatedly executed. Before starting step 1, the valve 26 may be opened to increase the supply of purge gas.
- Step 1 Raw material gas supply process
- HCDS gas is supplied to the wafer 7 in the processing chamber 6.
- the valve 14a is opened to allow HCDS gas to flow into the gas supply pipe 9a and N 2 gas to flow into the gas supply pipe 12a.
- the flow rates of the HCDS gas and the N 2 gas are adjusted by the MFCs 10a and 13a, respectively, and are supplied into the processing chamber 6 via the nozzle 8a and exhausted from the exhaust pipe 15.
- a silicon (Si) -containing film having a thickness of less than one atomic layer to several atomic layers is formed as a first layer on the outermost surface of the wafer 7.
- Step 2 Raw material gas exhaust process
- the valve 11a is closed to stop the supply of HCDS gas.
- the APC valve 17 left open, the inside of the processing chamber 6 is evacuated by the vacuum pump 18 to process the unreacted or HCDS gas remaining in the processing chamber 6 after contributing to the formation of the first layer. Exhaust from the chamber 6. Further, with the valve 14a kept open, the supplied N 2 gas purges the inside of the gas supply pipe 9a and the nozzle processing chamber 6.
- Step 3 Reaction gas supply process
- NH 3 gas is supplied to the wafer 7 in the processing chamber 6.
- the opening / closing control of the valves 11b and 14b is performed in the same procedure as the opening / closing control of the valves 11a and 14a in step 1.
- the flow rates of the NH 3 gas and the N 2 gas are adjusted by the MFCs 10b and 13b, respectively, and are supplied into the processing chamber 6 via the nozzle 8b and exhausted from the exhaust pipe 15.
- the NH 3 gas supplied to the wafer 7 reacts with at least a part of the first layer formed on the wafer 7, that is, the Si-containing layer in step 1.
- the first layer is nitrided and changed (modified) into a second layer containing Si and N, that is, a silicon nitride layer (SiN layer).
- Step 4 Reaction gas exhaust process
- a SiN film having a predetermined composition and a predetermined film thickness can be formed on the wafer 7 by performing the above four steps non-simultaneously, that is, by performing a predetermined number of cycles (n times) without overlapping.
- the above cycle is preferably repeated a plurality of times.
- the processing conditions of the above sequence include, for example, Processing temperature (wafer temperature): 250-700 ° C, Processing pressure (processing chamber pressure): 1 to 4000 Pa, HCDS gas supply flow rate: 1-2000 sccm, NH 3 gas supply flow rate: 100 to 10000 sccm, N 2 gas supply flow rate (nozzle): 100 to 10000 sccm, N 2 gas supply flow rate (rotating shaft): 100-500 sccm, Is exemplified.
- Processing temperature wafer temperature
- Processing pressure processing chamber pressure
- HCDS gas supply flow rate 1-2000 sccm
- NH 3 gas supply flow rate 100 to 10000 sccm
- N 2 gas supply flow rate (nozzle) 100 to 10000 sccm
- N 2 gas supply flow rate (rotating shaft) 100-500 sccm
- Is exemplified Is exemplified.
- Pyrolytic gases such as HCDS may be more likely to form a by-product film on the metal surface than quartz.
- the surface exposed to HCDS (and ammonia) is liable to adhere to SiO, SiON, etc., especially when the temperature is 260 ° C. or lower.
- the lid 19 is lowered by the boat elevator 27, and the lower end of the manifold 5 is opened. Then, the processed wafer 7 is carried out of the reaction tube 4 from the lower end of the manifold 5 while being supported by the boat 21 (boat unloading). The processed wafer 7 is taken out from the boat 21.
- a vacuum cavity is formed inside the heat insulating plate 40, and by embedding a heat insulating material having a high reflectance in the cavity, radiant heat can be reflected and the heat insulating performance in the processing chamber can be improved.
- B Therefore, the temperature stabilization time in the processing chamber can be shortened, and the in-plane uniformity of the wafer can be improved.
- C Specifically, a vacuum cavity is formed inside the cap heater 34, and the radiant heat of the cap heater 34 is transferred into the furnace by arranging the heat insulating plate 40 in which the heat shield material 50 is embedded in the cavity. It can be fastened to suppress heat escape from the lower part of the processing chamber 6.
- a plurality of heat shields 50 can be laminated and provided in the cavity 60 of the heat insulating plate 40.
- Substrate processing equipment Furnace 3 Heater 4 Reaction tube 6 Processing chamber 7 Wafer (board) 21 Boat (board holder) 22 Insulation structure 29 Controller 34 Cap heater (sub-heater) 40 Insulation plate 50 Heat insulation material 51 Insulation cloth 52 Sealing plate 53 Heat insulation sheet 54 Side heat insulation material 56 Heat absorber
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Abstract
Description
熱処理炉の温度勾配を伴う炉口付近に配置される断熱構造体であって、
金属製の遮熱材と、前記遮熱材の表裏各面を覆う石英もしくはセラミックス製の封止部材とを有し、前記封止部材の内部に構成された真空の空洞に前記遮熱材が配置された断熱板を複数備え、
前記複数の断熱板が、それぞれ互いに間隔を空けて配置されてなる断熱構造体を有する技術が提供される。
複数枚のウェハ7がボート21に装填(ウェハチャージ)されると、ボート21は、ボートエレベータ27によって処理室6内に搬入(ボートロード)される。このとき、蓋19は、Oリング19Aを介してマニホールド5の下端を気密に閉塞(シール)した状態となる。ウェハチャージする前のスタンバイの状態から、バルブ26を開き、カバー39内へ少量のパージガスが供給されうる。
処理室6内、すなわち、ウェハ7が存在する空間が所定の圧力(真空度)となるように、真空ポンプ18によって真空排気(減圧排気)される。この際、処理室6内の圧力は、圧力センサ16で測定され、この測定された圧力情報に基づきAPCバルブ17が、フィードバック制御される。カバー39内へのパージガス供給及び真空ポンプ18の作動は、少なくともウェハ7に対する処理が終了するまでの間は維持する。
処理室6内から酸素等が十分排気された後、処理室6内の昇温が開始される。処理室6が成膜に好適な所定の温度分布となるように、温度検出器28が検出した温度情報に基づきヒータ3及びキャップヒータ34への通電具合がフィードバック制御される。ヒータ3及びキャップヒータ34による処理室6内の加熱は、少なくともウェハ7に対する処理(成膜)が終了するまでの間は継続して行われる。キャップヒータ34への通電期間は、ヒータ3による加熱期間と一致させる必要はない。例えば成膜が開始される直前において、キャップヒータ34の温度は、成膜温度と同温度に到達し、マニホールド5の内面温度は180℃以上(例えば260℃)に到達していることが望ましい。直前に加熱したほうが、Oリング19Aが高温に晒される時間が短くなり、寿命が延びうる。
処理室6内の温度が予め設定された処理温度に安定すると、ステップ1~4を繰り返し実行する。なお、ステップ1を開始する前に、バルブ26を開き、パージガスの供給を増加させてもよい。
ステップ1では、処理室6内のウェハ7に対し、HCDSガスを供給する。バルブ11aを開くと同時にバルブ14aを開き、ガス供給管9a内へHCDSガスを、ガス供給管12a内へN2ガスを流す。HCDSガスおよびN2ガスは、それぞれMFC10a、13aにより流量調整され、ノズル8aを介して処理室6内へ供給され、排気管15から排気される。ウェハ7に対してHCDSガスを供給することにより、ウェハ7の最表面上に、第1の層として、例えば、1原子層未満から数原子層の厚さのシリコン(Si)含有膜が形成される。
第1の層が形成された後、バルブ11aを閉じ、HCDSガスの供給を停止する。このとき、APCバルブ17は開いたままとして、真空ポンプ18により処理室6内を真空排気し、処理室6内に残留する未反応もしくは第1の層の形成に寄与した後のHCDSガスを処理室6内から排出する。また、バルブ14aを開いたままとして、供給されたN2ガスは、ガス供給管9a、ノズル処理室6内をパージする。
ステップ3では、処理室6内のウェハ7に対してNH3ガスを供給する。バルブ11b,14bの開閉制御を、ステップ1におけるバルブ11a,14aの開閉制御と同様の手順で行う。NH3ガスおよびN2ガスは、それぞれMFC10b、13bにより流量調整され、ノズル8bを介して処理室6内へ供給され、排気管15から排気される。ウェハ7に対して供給されたNH3ガスは、ステップ1でウェハ7上に形成された第1の層、すなわちSi含有層の少なくとも一部と反応する。これにより第1の層は窒化され、SiおよびNを含む第2の層、すなわち、シリコン窒化層(SiN層)へと変化(改質)される。
第2の層が形成された後、バルブ11bを閉じ、NH3ガスの供給を停止する。そして、ステップ2と同様の処理手順により、処理室6内に残留する未反応もしくは第2の層の形成に寄与した後のNH3ガスや反応副生成物を処理室6内から排出する。
処理温度(ウェハ温度):250~700℃、
処理圧力(処理室内圧力):1~4000Pa、
HCDSガス供給流量:1~2000sccm、
NH3ガス供給流量:100~10000sccm、
N2ガス供給流量(ノズル):100~10000sccm、
N2ガス供給流量(回転軸):100~500sccm、
が例示される。それぞれの処理条件を、それぞれの範囲内のある値に設定することで、成膜処理を適正に進行させることが可能となる。
成膜処理が完了した後、バルブ14a、14bを開き、ガス供給管12a、12bからN2ガスを処理室6内へ供給し、排気管15から排気する。これにより、処理室6内の雰囲気が不活性ガスに置換され(不活性ガス置換)、残留する原料や副生成物が処理室6内から除去(パージ)される。その後、APCバルブ17が閉じられ、処理室6内の圧力が常圧になるまでN2ガスが充填される(大気圧復帰)。
ボートエレベータ27により蓋19が下降され、マニホールド5の下端が開口される。そして、処理済のウェハ7が、ボート21に支持された状態で、マニホールド5の下端から反応管4の外部に搬出される(ボートアンロード)。処理済のウェハ7は、ボート21より取出される。
(a)断熱板40内部に真空の空洞が形成され、空洞内に高反射率の遮熱材を埋め込むことにより、輻射熱を反射させて、処理室内の断熱性能を向上させることができる。
(b)よって、処理室内の温度安定時間を短縮することができ、ウェハ面内均一性を向上させることができる。
(c)具体的には、キャップヒータ34の下部に内部に真空の空洞が形成され、空洞内に遮熱材50を埋め込んだ断熱板40を配置することで、キャプヒータ34の輻射熱を炉内に留めて、処理室6下部の熱逃げを抑制することができる。
(d)また、断熱板40を覆うカバー39の側面に側部遮熱材54を設けることにより、キャップヒータ34の輻射熱を処理室6下部に逃がさず、ウェハ7に反射させることができる。
(e)また、反応管4の炉口付近に、断熱クロス51を巻き、さらに遮熱シート53で覆うことにより、ボトムウェハ等の温度が下がり易い箇所の断熱性能を向上させることができ、処理室内の温度安定時間を短縮させることができる。また、外部から炉内への輻射熱を反射して炉内温度を安定させることができる。
(f)また、フランジ部4Cの上面に熱吸収体56を設けることにより、フランジ部4C付近の輻射熱が吸収され、フランジ部4Cとマニホールド5の間のシール部材を保護することができる。
(g)また、従来と同等の枚数で断熱性能を向上させることができる。また、従来と同等の断熱性能を維持しようとした場合には、断熱板40の枚数を減らすことが可能となる。
なお当業者であれば、上述の実施形態における石英カバーの遮熱材は、最も上段の断熱板より上に配置し、それより下は不要或いは不透明石英で代替できることを理解するであろう。
2 炉
3 ヒータ
4 反応管
6 処理室
7 ウェハ(基板)
21 ボート(基板保持具)
22 断熱構造体
29 コントローラ
34 キャップヒータ(サブヒータ)
40 断熱板
50 遮熱材
51 断熱クロス
52 封止板
53 遮熱シート
54 側部遮熱材
56 熱吸収体
Claims (11)
- 熱処理炉の温度勾配を伴う炉口付近に配置される断熱構造体であって、
金属製の遮熱材と、前記遮熱材の表裏各面を覆う石英もしくはセラミックス製の封止部材とを有し、前記封止部材の内部に構成された真空の空洞に前記遮熱材が配置された断熱板を複数備え、
前記複数の断熱板が、それぞれ互いに間隔を空けて配置されてなる断熱構造体。 - 前記封止部材は1対の円盤状の封止板で構成され、
前記複数の断熱板におけるそれぞれの前記遮熱材は、それぞれ前記1対の封止板のいずれよりも薄く形成されるとともに、表裏面の間を連通させる少なくとも1つの貫通孔を有し、前記1対の封止板は、前記1対の封止板の全周及び前記貫通孔の中において互いに接続される請求項1記載の断熱構造体。 - 前記複数の断熱板におけるそれぞれの前記遮熱材は、鏡面の表面を有する請求項1記載の断熱構造体。
- 前記複数の断熱板におけるそれぞれの前記遮熱材は、前記空洞内で前記1対の封止板と面接触しないように支持される請求項2記載の断熱構造体。
- 前記複数の断熱板におけるそれぞれの前記遮熱材は、規則的に配置された複数の前記貫通孔を有する請求項2記載の断熱構造体。
- 前記1対の封止板は、自重で撓まないような剛性を有し、少なくとも前記互いに接続される部分を除き、鏡面の表面を有する請求項2記載の断熱構造体。
- 前記複数の断熱板の配列軸と略同軸に設けられ、前記複数の断熱板を保持する断熱板保持具と、
前記配列軸と略同軸に設けられ、前記複数の断熱板を覆う、石英もしくはセラミックス製の筒状のカバーと、を更に備え、
前記カバーは、筒状の側部遮熱材が埋め込まれた側面を有する請求項1記載の断熱構造体。 - 内部で基板を処理する筒形の処理容器と、
前記処理容器内で前記基板を保持する基板保持具と、
前記処理容器内に処理ガスを供給する処理ガス供給部と、
前記処理容器外に設置され、前記処理容器内を加熱する筒形の第1ヒータと、
前記処理容器の一端に配置される蓋と、
前記基板保持具よりも前記蓋側寄りに設置され、前記処理容器内を加熱する第2ヒータと、
前記第1ヒータの前記蓋側の端と、前記蓋との間において、前記処理容器の外周に設置される断熱クロスと、
前記断熱クロスの外側に巻かれる遮熱シートと、
前記蓋と前記基板保持具との間に設置された断熱構造体と、を備え、
前記断熱構造体は、金属製の遮熱材と、前記遮熱材の表裏各面を覆う石英もしくはセラミックス製の封止部材とを有し、前記封止部材の内部に構成された真空の空洞に前記遮熱材が配置された断熱板を、互いに間隔を空けて複数配置して構成され、
前記断熱構造体の前記蓋から遠い端は、前記第1ヒータの前記蓋側の端よりも、前記処理容器の奥側に配置される
基板処理装置。 - 前記処理容器は、少なくとも前記第1ヒータに囲まれた部分が、赤外線を透過する材料で形成された反応管によって構成され、
前記反応管は、前記蓋側の相手側部材とシール部材を介して接続するフランジ部を有し、
前記フランジ部の、前記蓋側の相手側部材と反対側の面に、所定の放射率を有する熱吸収体を備えた請求項8記載の基板処理装置。 - 前記遮熱材および前記遮熱シートは、モリブデン製である請求項8又は9記載の基板処理装置。
- 内部で基板を処理する筒形の処理容器内で基板保持具に前記基板を保持して、前記処理容器内に処理ガスを供給する工程と、
前記処理容器外に設置される筒形の第1ヒータの、前記処理容器の一端に設けられた蓋側の端と、前記蓋との間において、前記処理容器の外周に設置される断熱クロスと、前記断熱クロスの外側に巻かれる遮熱シートと、金属製の遮熱材と前記遮熱材の表裏各面を覆う石英もしくはセラミックス製の封止部材とを有し、前記封止部材の内部に構成された真空の空洞に前記遮熱材が配置された断熱板を、前記処理容器内の前記蓋と前記基板保持具との間に互いに間隔を空けて複数配置して構成され、前記蓋から遠い側の端が、前記第1ヒータの前記蓋側の端よりも、前記蓋から遠くに配置された断熱構造体とにより断熱しながら、前記第1ヒータと、前記断熱構造体内に設置される第2ヒータにより、前記処理容器内を加熱する工程と、
を有する半導体装置の製造方法。
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US20220108900A1 (en) | 2022-04-07 |
JP7189345B2 (ja) | 2022-12-13 |
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