WO2020188857A1 - 基板処理装置、反応容器、半導体装置の製造方法および記録媒体 - Google Patents
基板処理装置、反応容器、半導体装置の製造方法および記録媒体 Download PDFInfo
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- WO2020188857A1 WO2020188857A1 PCT/JP2019/035877 JP2019035877W WO2020188857A1 WO 2020188857 A1 WO2020188857 A1 WO 2020188857A1 JP 2019035877 W JP2019035877 W JP 2019035877W WO 2020188857 A1 WO2020188857 A1 WO 2020188857A1
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- gas
- reaction vessel
- substrate
- heat insulating
- protrusion
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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
- H01L21/67—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
- H01L21/67017—Apparatus for fluid treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67098—Apparatus for thermal treatment
- H01L21/67103—Apparatus for thermal treatment mainly by conduction
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
Definitions
- the present disclosure relates to a substrate processing apparatus, a reaction vessel, a manufacturing method of a semiconductor apparatus, and a recording medium.
- a film forming process for forming a film on a substrate housed in a processing chamber may be performed (see, for example, Patent Document 1).
- An object of the present disclosure is to provide a technique for improving the manufacturing throughput of a substrate processing apparatus.
- the reaction vessel is a reaction vessel into which a substrate support having a substrate support region for supporting the substrate and a heat insulating portion provided below the substrate support region are inserted, and is an inner wall of the reaction vessel. It has a reaction vessel in which an end portion of a protrusion toward the inside of the reaction vessel is arranged below the portion facing the substrate support region of the above, and a gas supply portion for supplying a processing gas to the substrate.
- FIG. 1 is a schematic configuration diagram of a vertical processing furnace of a substrate processing apparatus preferably used in one aspect of the present disclosure, and is a diagram showing a processing furnace portion in a vertical cross-sectional view.
- FIG. 2 is a schematic configuration diagram of a vertical processing furnace of a substrate processing apparatus preferably used in one aspect of the present disclosure, and is a view showing a processing furnace portion in a cross-sectional view taken along the line AA of FIG.
- FIG. 3 is a schematic configuration diagram of a gas supply system of a substrate processing apparatus preferably used in one aspect of the present disclosure.
- FIG. 1 is a schematic configuration diagram of a vertical processing furnace of a substrate processing apparatus preferably used in one aspect of the present disclosure, and is a diagram showing a processing furnace portion in a vertical cross-sectional view.
- FIG. 2 is a schematic configuration diagram of a vertical processing furnace of a substrate processing apparatus preferably used in one aspect of the present disclosure, and is a view showing a processing furnace portion in a cross-
- FIG. 4A is a schematic configuration diagram of a vertical processing furnace of a substrate processing apparatus preferably used in one aspect of the present disclosure, and is a view showing a processing furnace portion in a vertical cross-sectional view, FIG. 4B. Is a cross-sectional view taken along the line BB of FIG. 4A.
- FIG. 5 (a) is a schematic configuration diagram of a modified example of a vertical processing furnace of a substrate processing apparatus preferably used in one aspect of the present disclosure
- FIG. 5 (b) is a schematic configuration diagram of a modified example of the vertical processing furnace of the substrate processing apparatus. It is a cross-sectional view of line B.
- FIG. 5 (a) is a schematic configuration diagram of a modified example of a vertical processing furnace of a substrate processing apparatus preferably used in one aspect of the present disclosure
- FIG. 5 (b) is a schematic configuration diagram of a modified example of the vertical processing furnace of the substrate processing apparatus. It is a cross-sectional view of line B.
- FIG. 6 (a) is a schematic configuration diagram of another modification of the vertical processing furnace of the substrate processing apparatus preferably used in one aspect of the present disclosure
- FIG. 6 (b) is a schematic configuration diagram of FIG. 6 (a).
- BB line sectional view. 7 (a) is an enlarged schematic view of the region Z indicated by the alternate long and short dash line in FIG. 4 (a)
- FIG. 7 (b) is an enlarged schematic view of the region Z indicated by the alternate long and short dash line in FIG. 5 (a).
- FIG. 7 (c) is an enlarged schematic view of the region Z indicated by the alternate long and short dash line in FIG. 6 (a).
- 8 (a) is a diagram showing a modified example of the gas flow path, FIG.
- FIG. 8 (b) is a diagram showing another modified example of the gas flow path
- FIG. 8 (c) is a diagram showing another modified example of the gas flow path. It is a figure which shows the other modified example
- FIG. 8 (d) is a figure which shows the other modified example of a gas flow path
- FIG. 8 (e) is a figure which shows the other modified example of a gas flow path
- 8 (f) is a diagram showing another modified example of the gas flow path.
- FIG. 9A is a schematic configuration diagram of another modification of the vertical processing furnace of the substrate processing apparatus preferably used in one aspect of the present disclosure
- FIG. 9B is an aspect of the present disclosure. It is a schematic block diagram of another modification of the vertical processing furnace of a substrate processing apparatus which is preferably used.
- FIG. 9A is a schematic configuration diagram of another modification of the vertical processing furnace of the substrate processing apparatus preferably used in one aspect of the present disclosure
- FIG. 9B is an aspect of the present disclosure. It is a schematic block diagram of another
- FIG. 10 is a schematic configuration diagram of another modification of the vertical processing furnace of the substrate processing apparatus preferably used in one aspect of the present disclosure.
- FIG. 11 is a schematic configuration diagram of another modification of the vertical processing furnace of the substrate processing apparatus preferably used in one aspect of the present disclosure.
- FIG. 12 is a schematic configuration diagram of another modification of the vertical processing furnace of the substrate processing apparatus preferably used in one aspect of the present disclosure, and is a view showing a processing furnace portion in a cross section.
- FIG. 13 is a schematic configuration diagram of a controller of a substrate processing apparatus preferably used in one aspect of the present disclosure, and is a diagram showing a control system of the controller in a block diagram.
- FIG. 11 is a schematic configuration diagram of another modification of the vertical processing furnace of the substrate processing apparatus preferably used in one aspect of the present disclosure.
- FIG. 12 is a schematic configuration diagram of another modification of the vertical processing furnace of the substrate processing apparatus preferably used in one aspect of the present disclosure, and is a view showing a processing furnace portion in
- FIG. 14 is an example of a flow chart showing the operation of the substrate processing apparatus preferably used in one aspect of the present disclosure.
- FIG. 15 is a diagram showing an example of a film forming sequence in one aspect of the present disclosure.
- FIG. 16 is a diagram showing an example of a simulation result of the amount of Gas inflow into the low temperature region.
- the substrate processing device 10 is configured as an example of a device used in the manufacturing process of a semiconductor device.
- the substrate processing device 10 includes a processing furnace 202 provided with a heater 207 as a heating means (heating mechanism, heating system).
- the heater 207 has a cylindrical shape and is vertically installed by being supported by a heater base (not shown) as a holding plate.
- the heater 207 also functions as an activation mechanism (excitation portion) for activating (exciting) the gas with heat.
- a reaction tube constituting a reaction vessel is arranged concentrically with the heater 207.
- the reaction tube has a double tube configuration including an inner tube (inner tube, inner tube) 204 and an outer tube (outer tube, outer tube) 203 that concentrically surrounds the inner tube 204.
- the inner tube 204 and the outer tube 203 are each made of a heat-resistant material such as quartz (SiO 2 ) or silicon carbide (SiC), and are formed in a cylindrical shape with the upper end closed and the lower end open.
- a processing chamber 201 for processing the wafer 200 as a substrate is formed in the hollow portion of the inner tube 204 (inside the reaction vessel).
- the processing chamber 201 is configured to accommodate the wafers 200 in a state of being arranged in the processing chamber 201 from one end side (lower side) to the other end side (upper side).
- the inside of the processing chamber 201 can be divided into a plurality of regions.
- the region in which a plurality of wafers 200 are arranged in the processing chamber 201 is also referred to as a substrate arrangement region (wafer arrangement region).
- the wafer arrangement region is also referred to as a substrate processing region T2 (wafer processing region) and a substrate holding region (wafer holding region).
- the wafer arrangement region is a region where the temperature is kept uniform by the heater 207, the wafer arrangement region is also referred to as a heat equalizing region T1 in the present disclosure.
- a region including the wafer arrangement region and surrounded by the heater 207 that is, a region having a relatively high temperature in the processing chamber 201 is also referred to as a high temperature region.
- a region that does not include the wafer arrangement region and is not surrounded by the heater 207 that is, a region having a relatively low temperature in the processing chamber 201. Is also referred to as a low temperature region.
- the low temperature region is a region in the processing chamber 201 below the upper surface of the heat insulating portion 218.
- the direction in which the wafers 200 are arranged in the processing chamber 201 is also referred to as a substrate arrangement direction (wafer arrangement direction).
- a manifold (inlet flange) 209 is arranged concentrically with the outer tube 203.
- the inner tube 204 and the outer tube 203 are each supported from below by the manifold 209.
- the manifold 209 is made of a metal material such as stainless steel (SUS), and is formed in a cylindrical shape with open upper and lower ends.
- SUS stainless steel
- the inner wall of the manifold 209 is provided with an annular flange portion 209a made of a metal material such as SUS and extending inward in the radial direction of the manifold 209.
- the lower end of the inner tube 204 is in contact with the upper surface of the flange portion 209a.
- the lower end of the outer tube 203 is in contact with the upper end of the manifold 209.
- an O-ring 220a as a sealing member is provided between the manifold 209 and the outer tube 203.
- the reaction vessel is mainly composed of the outer tube 203, the inner tube 204, and the manifold 209.
- a spare chamber (nozzle accommodating chamber) 201a is formed in the hollow portion of the inner tube 204.
- the spare chamber 201a is formed in a channel shape (groove shape) that protrudes outward in the radial direction of the inner tube 204 from the side wall of the inner tube 204 and extends along the vertical direction.
- the inner wall of the spare chamber 201a constitutes a part of the inner wall of the processing chamber 201.
- the spare chamber 201a and the processing chamber 201 are communicated with each other through the opening 201b provided in the inner tube 204.
- the opening 201b is configured as a slit-shaped through hole.
- Nozzles 410 and 420 as gas supply units are housed in the spare chamber 201a, respectively.
- the nozzles 410 and 420 are each made of a heat-resistant material such as quartz or SiC, and each is made of an L-shaped long nozzle.
- the horizontal portions of the nozzles 410 and 420 are provided so as to penetrate the side wall of the manifold 209 and the lower side wall of the inner tube 204.
- the vertical portions of the nozzles 410 and 420 are provided so as to rise upward in the wafer arrangement direction along the upper portion of the inner wall of the spare chamber 201a from the lower portion. That is, as shown in FIG.
- the nozzles 410 and 420 are provided in the regions horizontally surrounding the wafer array region on the side of the wafer array region, respectively, along the wafer array region. As shown in FIG. 1, the nozzles 410 and 420 are provided so that the height position of their upper ends reaches the height position near the ceiling of the boat 217, which will be described later. In the present disclosure, the nozzles 410 and 420 are also referred to as a first nozzle and a second nozzle, respectively.
- Gas supply holes (openings) 410a and 420a for supplying gas are provided on the side surfaces of the nozzles 410 and 420, respectively.
- a plurality of gas supply holes 410a and 420a in the nozzles 410 and 420 are provided from the upper part to the lower part of the nozzles 410 and 420 at positions facing the wafer 200, that is, corresponding to the entire area of the wafer arrangement region in the wafer arrangement direction. It is provided. That is, a plurality of gas supply holes 410a and 420a are provided at height positions from the lower part to the upper part of the boat 217, which will be described later, so that gas can be ejected to all the wafers 200 housed in the boat 217. It has become.
- the gas supply holes 410a and 420a are opened so as to face the center of the processing chamber 201, respectively, and are configured so that gas can be ejected toward the wafer 200.
- the gas supply holes 410a and 420a each have the same opening area and are provided with the same opening pitch.
- the gas supply holes 410a and 420a are not limited to such an embodiment.
- the opening area of the gas supply holes 410a and 420a may be gradually increased from the upstream side (lower part of the inner tube 204) to the downstream side (upper part of the inner tube 204), or the opening pitch of the gas supply holes 410a and 420a may be increased. It may be gradually reduced from the upstream side to the downstream side.
- the gas is conveyed via the nozzles 410 and 420 arranged in the spare chamber 201a, which is a cylindrical space. Then, gas is ejected into the processing chamber 201 from the gas supply holes 410a and 420a opened in the nozzles 410 and 420, respectively.
- the main flow of gas in the inner tube 204 is in a direction parallel to the surface of the wafer 200, that is, in a horizontal direction. With such a configuration, it is possible to uniformly supply gas to each wafer 200.
- the gas flowing on the surface of the wafer 200 flows in the direction of the exhaust hole 204a described later. However, the direction of this gas flow is appropriately specified by the position of the exhaust hole 204a, and is not limited to the horizontal direction.
- Gas supply pipes 310 and 320 are connected to the nozzles 410 and 420.
- the inner tube 204 is connected to the two nozzles 410 and 420 and the two gas supply pipes 310 and 320, respectively, and a plurality of types of gas, here two types of gas, are introduced into the processing chamber 201. It is configured to be able to supply.
- a gas supply pipe 350 is connected below the manifold 209.
- the gas supply pipe 350 is provided so as to penetrate the lower side wall of the manifold 209 and the inner tube 204.
- the gas supply pipes 310, 320, and 350 are provided with mass flow controllers (MFCs) 312, 322, 352, and on-off valves, which are flow rate controllers (flow control units), in order from the upstream side of the gas flow.
- MFCs mass flow controllers
- Certain valves 314, 324 and 354 are provided respectively.
- Gas supply pipes 510 and 520 are connected to the downstream side of the valves 314 and 324 of the gas supply pipes 310 and 320, respectively.
- the gas supply pipes 510 and 520 are provided with MFCs 512 and 522 and valves 514 and 524, respectively, in order from the upstream side of the gas flow.
- a gas containing aluminum (Al) as a main element (predetermined element, metal element) constituting a film formed on the wafer 200 as a raw material gas as a processing gas that is, an Al-containing gas.
- Metal-containing gas, metal-containing raw material gas, Al-containing raw material gas can be supplied to the wafer processing region in the processing chamber 201 via the MFC 312, the valve 314, and the nozzle 410.
- the raw material gas is a raw material in a gaseous state, for example, a gas obtained by vaporizing a raw material in a liquid state under normal temperature and pressure, a raw material in a gaseous state under normal temperature and pressure, and the like.
- the Al-containing gas acts as a film-forming gas, that is, an Al source.
- an organic raw material gas containing Al and carbon (C) can be used.
- Al-containing gas for example, trimethylaluminum (Al (CH 3 ) 3 , abbreviation: TMA) gas can be used.
- TMA gas is an organic raw material gas containing alkylaluminum in which an alkyl group is bonded to Al.
- oxygen (O) -containing gas can be supplied to the wafer processing region in the processing chamber 201 via the MFC 322, the valve 324, and the nozzle 420 as the reaction gas (reactant) which is the processing gas. It has become.
- the O-containing gas acts as a film-forming gas, that is, an O source (oxidizing gas, oxidizing agent).
- the O-containing gas for example, can be used ozone (O 3) gas.
- nitrogen (N 2 ) gas as an inert gas is supplied to the wafer processing region in the processing chamber 201 via the MFC 512 and 522, the valves 514 and 524, and the nozzles 410 and 420, respectively. It is possible.
- the N 2 gas acts as a purge gas, a diluent gas, or a carrier gas.
- the N 2 gas as the inert gas, MFC352 it is possible to supply to the low temperature region in the processing chamber 201 through a valve 354.
- the N 2 gas acts as a purge gas.
- the raw material gas supply system (metal-containing raw material gas supply system) is mainly composed of the gas supply pipe 310, the MFC 312, and the valve 314.
- the nozzle 410 may be included in the raw material gas supply system.
- the reaction gas supply system (oxygen-containing gas supply system) is mainly composed of the gas supply pipe 320, the MFC 322, and the valve 324.
- the nozzle 420 may be included in the raw material gas supply system.
- the raw material gas supply system and the reaction gas supply system may be collectively considered as a processing gas supply system (gas supply system). Further, at least one of the raw material gas supply system and the reaction gas supply system may be considered as the processing gas supply unit.
- the gas supply pipes 510, 520, MFC 512, 522, and valves 514, 524 form a first inert gas supply system (purge gas supply system, dilution gas supply system, carrier gas supply system).
- the second inert gas supply system (purge gas supply system) is mainly composed of the gas supply pipe 350, the MFC 352, and the valve 354.
- an exhaust hole (exhaust slit) 204a configured as a slit-shaped through hole is elongated in the vertical direction.
- the exhaust hole 204a is, for example, rectangular in front view, and is provided so as to correspond to the entire area of the wafer arrangement region in the wafer arrangement direction from the lower part to the upper part of the side wall of the inner tube 204.
- the exhaust hole 204a is not limited to the case where it is configured as a slit-shaped through hole, and may be configured by a plurality of holes.
- the inside of the processing chamber 201 and the exhaust passage 206 formed by the annular space (gap) between the inner tube 204 and the outer tube 203 are communicated with each other through the exhaust hole 204a.
- the spare chamber 201a and the exhaust hole 204a face each other with the center of the wafer 200 housed in the processing chamber 201 interposed therebetween (positions opposite to each other by 180 degrees). .. Further, the nozzles 410 and 420 and the exhaust hole 204a face each other with the center of the wafer 200 housed in the processing chamber 201 interposed therebetween.
- an exhaust pipe 231 that exhausts the atmosphere in the processing chamber 201 is connected to the manifold 209 via an exhaust passage 206.
- the exhaust pipe 231 includes a pressure sensor 245 as a pressure detector (pressure detection unit) for detecting the pressure in the exhaust passage 206, that is, in the processing chamber 201, and an APC (Auto Pressure) as a pressure regulator (pressure regulator).
- a vacuum pump 246 as a vacuum exhaust device is connected via a controller valve 243.
- the APC valve 243 can perform vacuum exhaust and vacuum exhaust stop in the processing chamber 201 by opening and closing the valve with the vacuum pump 246 operating, and further, with the vacuum pump 246 operating, the APC valve 243 can perform vacuum exhaust and vacuum exhaust stop.
- the exhaust system that is, the exhaust line is mainly composed of the exhaust pipe 231, the APC valve 243, and the pressure sensor 245.
- the exhaust hole 204a, the exhaust passage 206, and the vacuum pump 246 may be included in the exhaust system.
- the lower end opening of the manifold 209 is configured as a furnace opening of the processing furnace 202, and when the boat 217 is raised by the boat elevator 115 described later, it is hermetically sealed by a seal cap 219 as a lid via an O-ring 220b. It will be stopped.
- the seal cap 219 is made of a metal material such as SUS and is formed in a disk shape.
- a rotation mechanism 267 for rotating the boat 217 is installed below the seal cap 219.
- the rotating shaft 255 of the rotating mechanism 267 penetrates the seal cap 219 and is connected to the boat 217.
- the rotation mechanism 267 is configured to rotate the wafer 200 by rotating the boat 217.
- the seal cap 219 is configured to be vertically lifted and lowered by a boat elevator 115 as a lifting mechanism vertically installed outside the outer tube 203.
- the boat elevator 115 is configured as a transport device (convey mechanism) for carrying in and out (transporting) the wafer 200 supported by the boat 217 into and out of the processing chamber 201 by raising and lowering the seal cap 219.
- the boat 217 as a substrate support supports a plurality of wafers, for example, 25 to 200 wafers 200, in a horizontal position and vertically aligned with each other, that is, in a multi-stage manner. It has a substrate support area configured to be spaced apart. Further, the boat 217 has a heat insulating portion support region for supporting the heat insulating portion 218 at the lower part (lower side) of the substrate supporting region. As the wafer 200, a product wafer, a dummy wafer, a fill dummy wafer, and the like are supported in the substrate support region of the boat 217.
- the boat 217 is made of a heat resistant material such as quartz or SiC. As shown in FIG.
- a heat insulating cylinder 218a as a heat insulating portion 218 formed as a cylindrical member by a heat resistant material such as quartz or SiC is provided in the heat insulating portion supporting region of the boat 217.
- the outer diameter (diameter) of the heat insulating cylinder 218a is larger than the outer diameter (diameter) of the boat 217. That is, in a plan view, the outer peripheral portion of the heat insulating cylinder 218a protrudes radially outward (toward the inner wall of the inner tube 204) from the boat 217 (support).
- the heat insulating cylinder 218a makes it difficult for the heat from the heater 207 to be transferred to the seal cap 219 side.
- the heat insulating cylinder 218a may have a space inside, and a heater (not shown) may be provided in the internal space.
- the heat insulating cylinder 218a can also be referred to as a heat insulating cylinder.
- the inner wall of the inner tube 204 is provided with a flange portion 500a as a protruding portion 500 protruding inward in the radial direction of the inner tube 204.
- the flange portion 500a is provided below the portion of the boat 217 facing the substrate support region. Specifically, the flange portion 500a is provided at a position below the wafer arrangement region and above the height position of the upper surface of the heat insulating cylinder 218a.
- the flange portion 500a is provided so that the inner peripheral portion of the bottom surface (also referred to as the lower end bottom surface) faces the outer peripheral portion (also referred to as the outer upper surface) of the upper surface of the heat insulating cylinder 218a.
- the flange portion 500a is configured such that the inner peripheral portion of the bottom surface of the flange portion 500a and the outer peripheral portion of the upper surface of the heat insulating cylinder 218a overlap in a plan view. Further, the flange portion 500a is provided so as not to come into contact with the boat 217 and the heat insulating cylinder 218a.
- the flange portion 500a may be integrally formed with the inner tube 204, or may be formed separately.
- a gas flow path 501 having a small conductance (a large flow resistance) is configured by the space between the bottom surface of the flange portion 500a and the upper surface of the heat insulating cylinder 218a.
- the amount of the processing gas supplied to the wafer arrangement region that invades the low temperature region for example, the region that horizontally surrounds the side surface (outer peripheral surface) of the heat insulating cylinder 218a. That is, it is possible to suppress the invasion of the processing gas into the low temperature region.
- members provided in the processing chamber 201 also referred to as “members in the processing chamber 201”
- members provided in the low temperature region in the processing chamber 201 also referred to as “members in the low temperature region”
- members provided in the low temperature region in the processing chamber 201 also referred to as “members in the low temperature region”.
- the inner tube 204 for example, the lower part of the inner wall of the inner tube 204, the inner wall of the manifold 209, the upper surface of the seal cap 219, the side surface of the rotating shaft 255, the upper surface and the side surface of the heat insulating cylinder 218a, etc. Accumulates (cumulative), that is, it becomes possible to suppress the adhesion of by-products.
- the gas flow path 501 it is possible to reduce the amount of the inert gas diffused (invaded) into the wafer processing region among the inert gases supplied from the gas supply pipe 350 into the low temperature region. Become. That is, it is also possible to suppress the diffusion of the inert gas into the wafer processing region.
- the processing gas supplied to the wafer 200 arranged in the lower region (Bottom zone) in the wafer arrangement direction of the wafer arrangement region is diffused into the wafer processing region.
- the bottom surface of the flange portion 500a is provided so as to be parallel to the upper surface of the heat insulating cylinder 218a.
- the flange portion 500a is provided on the inner wall of the inner tube 204 so as to be continuous in the circumferential direction surrounding the low temperature region. That is, it is preferable that the flange portion 500a is formed over the entire circumference of the inner wall of the inner tube 204. This makes it possible to reliably suppress the invasion of the processing gas into the low temperature region.
- the region near the opening 201b is a region where by-products are unlikely to adhere because the gas having a relatively high flow velocity immediately after being ejected from the nozzles 410 and 420 passes through.
- the region in the reserve chamber 201a is also a region in which by-products are less likely to adhere than in the processing chamber 201. Therefore, as shown in FIG. 4B, it is not necessary to provide the flange portion 500a in the opening 201b and the spare chamber 201a.
- the distance X between the bottom surface of the flange portion 500a and the top surface of the heat insulating cylinder 218a, that is, the width of the gas flow path is, for example, 0.01 to 8 mm, preferably 0. It can be 0.01 to 5 mm, more preferably 2 mm.
- the distance X can be made shorter than the distance D1 between the boat 217 and the inner surface (inner end surface) of the flange portion 500a (distance X ⁇ distance D1).
- the conductance of the gas flow path 501 can be made smaller than the conductance of the space between the boat 217 and the flange portion 500a, and the intrusion of the processing gas into the low temperature region can be reliably suppressed.
- the distance D1 can be, for example, 5 to 10 mm, preferably 7 mm, from the viewpoint of avoiding contact between the boat 217 and the flange portion 500a during rotation of the boat 217.
- the distance X can be made shorter than the distance Y between the inner surface of the flange portion 500a and the side surface of the heat insulating cylinder 218a (distance X ⁇ distance Y). That is, the distance Y is longer than the distance X. As a result, the length of the gas flow path 501 can be sufficiently secured, and the conductance of the gas flow path 501 can be reduced as much as possible. As a result, it is possible to more reliably suppress the invasion of the processing gas into the low temperature region.
- the distance Y can be, for example, 2 to 15 mm, preferably 4 to 10 m.
- the distance X is shorter than the distance D2 between the side surface of the heat insulating cylinder 218a and the inner wall of the inner tube 204 (the inner wall of the inner tube 204 located below the flange portion 500a) (distance X ⁇ distance D2). )be able to.
- the distance D2 can be substantially equal to (equal to) the distance D1 (distance D1 ⁇ distance D2). Similar to the distance D1, the distance D2 can be, for example, 5 to 10 mm, preferably 7 mm, from the viewpoint of avoiding contact between the heat insulating cylinder 218a and the inner tube 204 during rotation of the boat 217.
- a temperature sensor 263 as a temperature detector is installed in the inner tube 204.
- the temperature sensor 263 is L-shaped like the nozzles 410 and 420, and is provided along the inner wall of the inner tube 204.
- the controller 121 which is a control unit (control means), is configured as a computer including a CPU (Central Processing Unit) 121a, a RAM (Random Access Memory) 121b, a storage device 121c, and an I / O port 121d.
- the RAM 121b, the storage device 121c, and the I / O port 121d are configured so that data can be exchanged with the CPU 121a via the internal bus 121e.
- An input / output device 122 configured as, for example, a touch panel is connected to the controller 121.
- the storage device 121c is composed of, for example, a flash memory, an HDD (Hard Disk Drive), an SSD (Solid State Drive), or the like.
- a control program for controlling the operation of the substrate processing device, a process recipe in which procedures and conditions of a method for manufacturing a semiconductor device described later are described, and the like are readablely stored.
- the process recipes are combined so that the controller 121 can execute each process (each step, each procedure, each process) in the method of manufacturing a semiconductor device described later and obtain a predetermined result, and are combined as a program.
- Function process recipes, control programs, etc. are collectively referred to simply as programs.
- a process recipe is also simply referred to as a recipe.
- the RAM 121b is configured as a memory area (work area) in which programs, data, and the like read by the CPU 121a are temporarily held.
- the I / O port 121d includes the above-mentioned MFC 312,322,352,512,522, valve 314,324,354,514,524, pressure sensor 245, APC valve 243, vacuum pump 246, heater 207, temperature sensor 263, and rotation. It is connected to the mechanism 267, the boat elevator 115, and the like.
- the CPU 121a is configured to read and execute a control program from the storage device 121c and read a recipe from the storage device 121c in response to an input of an operation command from the input / output device 122 or the like.
- the CPU 121a adjusts the flow rate of various gases by the MFC 312, 322, 352, 512, 522, opens and closes the valves 314, 324, 354, 514, 524, and opens and closes the APC valve 243 so as to follow the contents of the read recipe.
- APC valve 243 based on pressure sensor 245, temperature adjustment operation of heater 207 based on temperature sensor 263, start and stop of vacuum pump 246, rotation and rotation speed adjustment operation of boat 217 by rotation mechanism 267, boat elevator It is configured to control the ascending / descending operation of the boat 217 by the 115, the accommodation operation of the wafer 200 in the boat 217, and the like.
- the controller 121 can be configured by installing the above-mentioned program stored in the external storage device 123 on the computer.
- the external storage device 123 includes, for example, a magnetic disk such as an HDD, an optical disk such as a CD, a magneto-optical disk such as MO, and a semiconductor memory such as a USB memory.
- the storage device 121c and the external storage device 123 are configured as a computer-readable recording medium. Hereinafter, these are collectively referred to simply as a recording medium.
- recording medium may include only the storage device 121c alone, it may include only the external storage device 123 alone, or it may include both of them.
- the program may be provided to the computer by using a communication means such as the Internet or a dedicated line without using the external storage device 123.
- Substrate processing process (semiconductor device manufacturing process) 14 and 15 show an example of a substrate processing sequence for forming a metal oxide film on a wafer 200, that is, a film forming sequence, as one step of a manufacturing process of a semiconductor device (device) using the above-mentioned substrate processing apparatus 10. Will be described using. In the following description, the operation of each part constituting the substrate processing apparatus 10 is controlled by the controller 121.
- step A of supplying TMA gas as a raw material gas to the wafer 200 in the processing chamber 201, And supplying O 3 gas as a reaction gas (step C) to the wafer 200 in the process chamber 201,
- step C supplying reaction gas
- step C to the wafer 200 in the process chamber 201
- step C A step of forming a film containing Al and O as a metal oxide film (aluminum oxide film (AlO film)) on the wafer 200 by performing a cycle of performing the above non-simultaneously a predetermined number of times (n times, n is an integer of 1 or more). I do.
- wafer When the word “wafer” is used in the present disclosure, it may mean the wafer itself or a laminate of a wafer and a predetermined layer or film formed on the surface thereof.
- wafer surface When the term “wafer surface” is used in the present disclosure, it may mean the surface of the wafer itself or the surface of a predetermined layer or the like formed on the wafer.
- a predetermined layer when it is described that "a predetermined layer is formed on a wafer”, it means that a predetermined layer is directly formed on the surface of the wafer itself, or a layer formed on the wafer or the like. It may mean forming a predetermined layer on top.
- board in the present disclosure is also synonymous with the use of the term "wafer”.
- Vacuum exhaust (vacuum exhaust) is performed by the vacuum pump 246 so that the pressure (vacuum degree) in the processing chamber 201, that is, the space where the wafer 200 exists, becomes a desired pressure.
- the pressure in the processing chamber 201 is measured by the pressure sensor 245, and the APC valve 243 is feedback-controlled based on the measured pressure information (pressure adjustment).
- the wafer 200 in the processing chamber 201 is heated by the heater 207 so as to have a desired processing temperature.
- the state of energization of the heater 207 is feedback-controlled based on the temperature information detected by the temperature sensor 263 so that the inside of the processing chamber 201 has a desired temperature distribution (temperature adjustment).
- the rotation mechanism 267 starts the rotation of the boat 217 and the wafer 200. Exhaust in the processing chamber 201, heating and rotation of the wafer 200 are all continuously performed at least until the processing of the wafer 200 is completed. At this time, by opening the valve 354, it may be flowed N 2 gas to the gas supply pipe 350 within.
- the flow rate of the N 2 gas is adjusted by the MFC 352, is supplied to a low temperature region (for example, a region below the bottom surface of the heat insulating cylinder 218a) in the processing chamber 201, and is discharged from the exhaust pipe 231.
- the flow rate of the N 2 gas at this time can be, for example, 0.1 to 2 slm, preferably 0.3 to 0.5 slm.
- the valve 314 is opened to allow TMA gas to flow into the gas supply pipe 310.
- the flow rate of the TMA gas is adjusted by the MFC 312, and the TMA gas is supplied from the gas supply hole 410a to the wafer processing region in the processing chamber 201.
- the TMA gas flows into the exhaust passage 206 through the exhaust hole 204a and is exhausted from the exhaust pipe 231.
- TMA gas is supplied to the wafer 200 (TMA gas supply).
- TMA gas supply N 2 gas to the gas supply pipe 510.
- the flow rate of the N 2 gas flowing through the gas supply pipe 510 is adjusted by the MFC 512, is supplied into the processing chamber 201 together with the TMA gas, and is discharged from the exhaust pipe 231.
- opening the valve 524 may be flowed N 2 gas to the gas supply pipe 520.
- the flow rate of the N 2 gas is adjusted by the MFC 522, is supplied into the processing chamber 201 via the gas supply pipe 320 and the nozzle 420, and is discharged from the exhaust pipe 231.
- the processing conditions in this step are Processing pressure: 1 to 1000 Pa, preferably 1 to 100 Pa, more preferably 10 to 50 Pa TMA gas supply flow rate: 10 to 2000 sccm, preferably 50 to 1000 sccm, more preferably 100 to 500 sccm TMA gas supply time: 1 to 60 seconds, preferably 1 to 20 seconds, more preferably 2 to 15 seconds N 2 gas supply flow rate (for each gas supply pipe): 1 to 30 slm, preferably 1 to 20 slm, more preferably 1 to 1 to 10 slm
- Treatment temperature room temperature (25 ° C) to 600 ° C, preferably 90 to 550 ° C, more preferably 450 to 550 ° C. Is exemplified.
- the lower limit of the processing temperature in this step can be appropriately changed depending on the type of O-containing gas used in step C described later.
- step B described later By setting the processing pressure in this step to 1000 Pa or less and the supply flow rate of TMA gas to 2000 sccm or less, step B described later can be suitably performed, and the TMA gas is autolyzed in the nozzle 410. It is possible to suppress the accumulation on the inner wall of the nozzle 410.
- the processing pressure in this step By setting the processing pressure in this step to 1 Pa or more and the supply flow rate of TMA gas to 10 sccm or more, the reaction rate of TMA gas on the surface of the wafer 200 can be increased, and a practical film forming rate can be obtained. It becomes possible.
- an Al-containing layer is formed as the first layer on the outermost surface of the wafer 200.
- the Al-containing layer may contain C and hydrogen (H) in addition to Al.
- the Al-containing layer is formed by chemisorption or physisorption of TMA on the surface of the wafer 200, chemisorption of a substance (Al (CH x ) y ) in which a part of TMA is decomposed, accumulation of Al by thermal decomposition of TMA, and the like. It is formed.
- the Al-containing layer may be an adsorption layer (physisorption layer or chemisorption layer) of TMA or a substance obtained by partially decomposing TMA, or may be an Al deposition layer (Al layer).
- the TMA gas supplied into the processing chamber 201 is not only supplied to the wafer 200, but also on the surface of the member in the processing chamber 201, that is, the inner wall of the inner tube 204 and the surfaces of the nozzles 410 and 420. It is also supplied to the surface of the boat 217, the inner wall of the manifold 209, the upper surface of the seal cap 219, the side surface of the rotating shaft 255, the upper surface and the side surface of the heat insulating portion 218, and the like.
- the TMA gas supplied into the processing chamber 201 comes into contact with the surface of the member in the processing chamber 201, the above-mentioned Al-containing layer is not only on the wafer 200 but also on the surface of the member in the processing chamber 201. It will be formed.
- reaction by-products may be deposited on the surface of the member in the processing chamber 201. In this way, by-products, which will be described later, are attached to the surface of the member in the processing chamber 201.
- gas channel 501 is configured into the processing chamber 201, a wafer processing region of the TMA gas to the cold area intrusion, it is possible to suppress the diffusion of the N 2 gas from the low temperature region to the wafer processing region .. This makes it possible to suppress the adhesion of by-products to the surface of the member in the low temperature region. Further, it is possible to suppress the dilution of the TMA gas in the Bottom zone and improve the uniformity of the film forming process.
- valve 314 is closed and the supply of TMA gas into the processing chamber 201 is stopped. At this time, the APC valve 243 is left open.
- AlCl 3 aluminum chloride (AlCl 3 ) gas or the like can be used in addition to TMA gas.
- a rare gas such as argon (Ar) gas, helium (He) gas, neon (Ne) gas, and xenon (Xe) gas can be used. This point is the same in steps B to D and the like described later.
- step B After the completion of step A, the APC valve 243 is kept open, the inside of the processing chamber 201 is evacuated by the vacuum pump 246, and the TMA gas remaining in the processing chamber 201 after contributing to the formation of the unreacted or Al-containing layer is discharged. Exhaust from the processing chamber 201 (residual gas removal). At this time, by opening the valve 514, 524 may be the N 2 gas is supplied from the nozzle 410, 420 into the process chamber 201. The N 2 gas acts as a purge gas. In this step, the N 2 gas may be continuously flowed (continuously supplied) or intermittently (pulse-like).
- the flow rate of the N 2 gas supplied into the processing chamber 201 does not need to be large, and for example, supplying an amount equivalent to the volume of the inner tube 204 (processing chamber 201) adversely affects the subsequent steps. It is possible to perform a purge that hardly occurs. By not completely purging the inside of the processing chamber 201 in this way, the purging time can be shortened and the throughput can be improved. In addition, the consumption of N 2 gas can be minimized.
- step C After the step B is finished, the wafer 200 in the process chamber 201, i.e., supplying the O 3 gas to the first layer formed on the wafer 200.
- O 3 gas is the flow rate adjusted by MFC322, is supplied to the wafer processing region of the processing chamber 201 from the gas supply holes 420a, through the exhaust hole 204a flows into the exhaust path 206 is discharged from the exhaust pipe 231.
- O 3 gas is supplied to the wafer 200 (O 3 gas supply).
- opening the valve 524 it may be flowed N 2 gas to the gas supply pipe 520.
- the flow rate of the N 2 gas flowing through the gas supply pipe 520 is adjusted by the MFC 522, is supplied into the processing chamber 201 together with the O 3 gas, and is discharged from the exhaust pipe 231.
- opening the valve 514 it may be flowed N 2 gas to the gas supply pipe 510.
- the flow rate of the N 2 gas is adjusted by the MFC 512, is supplied into the processing chamber 201 via the gas supply pipe 310 and the nozzle 410, and is discharged from the exhaust pipe 231.
- the processing conditions in this step are O 3 gas supply flow rate: 0.01 ⁇ 40 slm, preferably 5 ⁇ 30slmm, more preferably, 20 ⁇ 20 slm O 3 gas supply time 0.01 to 90 seconds, preferably 0.01 to 30 seconds, more preferably from 0.1 to 20 seconds treatment pressure: 1 ⁇ 1000 Pa, preferably 1 ⁇ 100 Pa, more preferably, 10 ⁇ 50Pa Is exemplified.
- Other processing conditions are the same as the processing conditions in step A.
- a first layer formed on the wafer 200 at least a portion of the (Al-containing layer) is reacted with the O 3 gas, the first layer At least part of it is oxidized (modified).
- a layer containing Al and O that is, an aluminum oxide layer (AlO layer) is formed on the wafer 200 as a second layer (metal oxide layer).
- AlO layer aluminum oxide layer
- C and impurities such as H contained in the first layer the structure in the course of a reforming reaction of the first layer by the O 3 gas, a gaseous material containing at least C or H Then, it is discharged from the processing chamber 201.
- the second layer becomes a layer having less impurities such as C and H than the first layer.
- O 3 gas supplied into the processing chamber 201 may be supplied to the wafer 200, it is to be supplied to the surface of the member in the process chamber 201.
- Al O 3 gas supplied into the processing chamber 201 by contact with the Al-containing layer formed on the surface of the member in the process chamber 201, a portion of the Al-containing layer, which is formed on the wafer 200 Like the containing layer, it is oxidized (modified) into an AlO layer.
- the processing chamber gas flow path 501 in the 201 are configured, the O 3 gas from entering from the wafer processing region to the cold region, it is possible to suppress the diffusion of the O 3 gas from the low temperature region to the wafer processing region Become. Thus, also in this step, it becomes possible to suppress the adhesion of the byproducts on the surface of the member in the low temperature region, to suppress the dilution of the O 3 gas in Bottom Zone, uniform film formation process It is possible to improve the sex.
- the O-containing gas includes O 3 gas, oxygen (O 2 ) gas, water vapor (H 2 O gas), plasma-excited O 2 gas (O 2 * ), and hydrogen peroxide (H 2 O 2 ) gas.
- O 2 * + H 2 * plasma-excited hydrogen (H 2 ) gas
- step D After step C has been completed, by the same procedure as Step B, and the processing chamber residual unreacted or or O 3 gas after contributing to the formation of AlO layer reaction by-products such as the processing chamber 201 into the 201 Exclude. At this time, it is not necessary to completely eliminate the gas and the like remaining in the processing chamber 201, which is the same as in step B described above.
- steps A to D in order (non-simultaneously), that is, one or more cycles (n times) that are performed without synchronization, an AlO film having a desired film thickness and a desired composition can be formed on the wafer 200. it can.
- the above cycle is preferably repeated a plurality of times. That is, until the thickness of the second layer formed per cycle is made smaller than the desired film thickness and the film thickness of the AlO film formed by laminating the second layer reaches the desired film thickness. It is preferable to repeat the above cycle a plurality of times.
- the film thickness of the AlO film can be, for example, 10 to 150 nm, preferably 40 to 100 nm, and more preferably 60 to 80 nm.
- the film thickness of the AlO film can be, for example, 10 to 150 nm, preferably 40 to 100 nm, and more preferably 60 to 80 nm.
- the by-products adhering to the surface of the member in the processing chamber 201 by performing the above-mentioned film forming treatment are removed by the cleaning treatment performed after the film forming treatment.
- the cleaning process can be performed, for example, by supplying cleaning gas into the processing chamber 201 from at least one of the nozzles 410 and 420. In the cleaning process, the temperature of the cleaning process is raised to activate the cleaning gas, and by-products adhering to the surface of the member in the processing chamber 201 are removed.
- the cleaning gas supplied to the low temperature region is difficult to activate.
- the temperature of the low temperature region of the processing chamber 201 is different from the temperature of the high temperature region, the by-products adhering to the surface of the member in the low temperature region are the members provided in the region other than the low temperature region of the processing chamber 201.
- the properties are different from the by-products attached to the surface (also referred to as "members in the high temperature region").
- the by-products adhering to the surface of the member in the low temperature region are less likely to be removed than the by-products adhering to the surface of the member in the high temperature region. Therefore, if the cleaning process is completed when the by-products adhering to the surface of the member in the high temperature region are removed, the by-products that could not be completely removed remain on the surface of the member in the low temperature region. In some cases. Further, if an attempt is made to completely remove the by-products adhering to the surface of the member in the low temperature region by a cleaning process, the member in the high temperature region may be etched by the cleaning gas.
- the cleaning processing time can be shortened, and the downtime of the substrate processing apparatus can be shortened. As a result, it is possible to improve the manufacturing throughput of the semiconductor manufacturing apparatus and improve the productivity of the semiconductor device.
- the gas flow path 501 it is possible to suppress the diffusion of the N 2 gas supplied from the gas supply pipe 350 into the low temperature region into the wafer processing region. This makes it possible to improve the uniformity of the film forming process.
- a method of suppressing the intrusion of the processing gas into the low temperature region can be considered by reducing the above-mentioned distance D2 without providing the flange portion 500a.
- the distance D2 needs to be 5 mm or more in consideration of the design tolerance.
- the distance D2 needs to be 5 mm or more. That is, it is difficult to make the distance D2 less than 5 mm. Therefore, this method may not be able to sufficiently suppress the intrusion of the processing gas into the low temperature region and the diffusion of the inert gas into the wafer processing region.
- a method of suppressing the intrusion of the processing gas into the low temperature region by supplying a large flow rate of the inert gas from the gas supply pipe 350 to the low temperature region in the processing chamber 201 without providing the flange portion 500a is also considered. Be done. However, in this method, since the inert gas is supplied from the gas supply pipe 350 at a large flow rate (for example, a supply amount larger than the supply amount of the processing gas), the amount of the inert gas diffused into the wafer processing region is large. .. Therefore, the difference between the concentration of the processing gas supplied to the wafer 200 arranged in the Bottom zone and the concentration of the processing gas supplied to the wafer 200 arranged in the Center zone or the Top zone is the present. It will be larger than in the case of the disclosed aspect. As a result, the uniformity of the film forming process may decrease.
- the conductance of the gas flow path 501 is further reduced by making the distance X shorter than the distance Y, that is, making the distance Y longer than the distance X and ensuring a sufficient length of the gas flow path 501. It becomes possible. This makes it possible to reliably suppress the intrusion of the processing gas into the low temperature region and the diffusion of the inert gas into the wafer processing region.
- the wall thickness of the inner tube 204 in which the protrusion 500 is located is set to be lower than the protrusion 500. It may be thicker than the wall thickness of the tube 204. That is, the thickness of the side wall 204b of the inner tube 204 that horizontally surrounds the high temperature region may be thicker than the thickness of the side wall 204c of the inner tube 204 that horizontally surrounds the low temperature region.
- the inner tube 204 may be configured by projecting (protruding) the side wall 204b in the radial direction inward from the side wall 204c.
- the side wall 204b constitutes an overhanging portion 500b as a protruding portion 500.
- the gas flow path 501 is formed by the space between the bottom surface of the overhanging portion 500b (the bottom surface of the side wall 204b) and the upper surface of the heat insulating portion 218.
- the outer wall of the inner tube 204 where the protrusion 500 is located and the outer wall of the inner tube 204 below the protrusion 500 are configured on the same surface. That is, the outer peripheral side surface of the inner tube 204 composed of the outer peripheral surface of the side wall 204b and the outer peripheral surface of the side wall 204c is the same surface (curved surface) having no step. In this modification, the side wall 204b and the side wall 204c have substantially the same outer diameter (diameter). In the present disclosure, the "substantially equal outer diameter" means that the difference between the outer diameter of the side wall 204b and the outer diameter of the side wall 204c is within, for example, about ⁇ 3% (within the design tolerance).
- the inner diameter of the side wall 204b is smaller than the inner diameter of the side wall 204c.
- the inner tube 204 can be easily manufactured. Further, it is possible to suppress diffused reflection of radiant heat from the heater 207 on the outer wall of the inner tube 204, and it is possible to improve the temperature uniformity of the wafer 200 among the plurality of wafers 200.
- the exhaust velocity (exhaust conductance) of the gas exhausted from the exhaust hole 204a can be kept uniform from the upper part to the lower part of the exhaust hole 204a. Become. That is, the exhaust characteristics of the wafer processing region can be made uniform from the upper part to the lower part of the boat 217. As a result, the pressure in the processing chamber 201 in the film forming process can be made uniform, and the in-plane film thickness uniformity of the thin film formed on the wafer 200 can be further improved.
- the outer diameter of the side wall 204b is larger than the outer diameter of the inner tube 204 of the above-described embodiment. It needs to be large.
- the outer tube 203 has the same configuration as the above-described embodiment. Therefore, the volume (volume) of the exhaust passage 206 formed in this modification (that is, the volume (volume) of the space between the inner tube 204 and the outer tube 203) becomes smaller than that of the above-described embodiment. As a result, in this modification, it is possible to improve the gas replacement efficiency as compared with the above-described embodiment.
- the side wall 204b is closer to the edge of the wafer 200 than in the above-described embodiment. That is, the distance between the inner surface of the side wall 204b and the edge of the wafer 200 is smaller than the distance between the inner surface of the inner tube 204 and the edge of the wafer 200 in the above-described embodiment. Therefore, the volume of the space between the inner surface of the side wall 204b and the edge of the wafer 200 is smaller than that of the above aspect. As a result, the amount of processing gas diffused in the space between the inner surface of the side wall 204b and the edge of the wafer 200 is reduced, and more processing gas can be supplied to the surface of the wafer 200. As a result, the in-plane film thickness uniformity of the thin film formed on the wafer 200 can be further improved.
- the inner tube 204 of this modification is a cylindrical member whose upper end is closed and whose lower end is open, and a member whose side wall thickness is the thickness of the side wall 204b is prepared, and a low temperature region of the side wall of this member is prepared. It can be manufactured by cutting the side wall of the portion that horizontally surrounds (the side wall of the portion that becomes the side wall 204c) from the inner peripheral surface toward the outer side in the radial direction. As described above, the inner tube 204 of this modified example can be easily manufactured only by cutting, and as a result, the dimensional error in manufacturing is suppressed within the range of ⁇ 1% or less, that is, it is manufactured with high accuracy. It becomes possible. When the inner tube 204 of this modified example is manufactured by cutting, the side wall 204b, the side wall 204c, and the ceiling portion are integrally formed of the same member.
- the inner tube 204 of this modification can also be manufactured by welding the first member constituting the side wall 204b, the second member constituting the side wall 204c, and the third member constituting the ceiling portion.
- the first member and the second member are cylindrical members having open upper ends and lower ends, respectively, and have substantially the same outer diameter.
- the first member has an inner diameter smaller than the inner diameter of the second member.
- the side wall 204b has a vertical portion and a horizontal portion extending outward in the radial direction of the inner tube 204 from the lower end of the vertical portion.
- the side wall 204b may form an overhanging portion 500c as a protruding portion 500.
- the bottom surface of the horizontal portion of the side wall 204b and the upper end of the side wall 204c are in contact with each other.
- the vertical portion and the horizontal portion of the side wall 204b and the side wall 204c each have substantially the same thickness.
- the outer diameter of the vertical portion of the side wall 204b is smaller than the outer diameter of the side wall 204c, and the outer diameter of the horizontal portion of the side wall 204b is equal to the outer diameter of the side wall 204c.
- the gas flow path 501 is formed by the bottom surface of the overhanging portion 500c (that is, the bottom surface of the horizontal portion of the side wall 204b) and the upper surface of the heat insulating cylinder 218a.
- a heat insulating cylinder 218b having a convex shape may be provided with respect to the boat 217. That is, as the heat insulating portion 218, a heat insulating cylinder 218b having a two-stage configuration of an upper stage portion having an outer diameter substantially equal to the outer diameter of the boat 217 and a lower stage portion having an outer diameter larger than the outer diameter of the upper stage portion is provided. You may be.
- the protruding portion 500 (flange portion 500a, overhanging portion 500b, 500c) faces the exposed upper surface (step portion, hereinafter also referred to as “exposed upper surface”) of the lower portion of the heat insulating cylinder 218b. It is provided.
- the gas flow path 501 is formed by the space between the bottom surface of the protruding portion 500 and the exposed upper surface of the lower portion of the heat insulating cylinder 218b. The same effect as that of the above-described embodiment and modification can be obtained by this modification.
- a plurality of heat insulating plates 218c may be provided as the heat insulating portion 218.
- the heat insulating plate 218c is made of a heat-resistant material such as quartz or SiC.
- the protrusion 500 is provided so as to face the upper surface of the heat insulating plate 218c arranged at the uppermost stage.
- the gas flow path 501 is formed by the space between the bottom surface of the protrusion 500 and the upper surface of the heat insulating plate 218c arranged at the uppermost stage. The same effect as that of the above-described embodiment can be obtained by this modification.
- a labyrinth structure (labyrinth structure) is provided in the gas flow path 501 as illustrated in FIGS. 8 (a) and 8 (b), respectively.
- the convex portion 204d projecting from the bottom surface of the projecting portion 500 toward the gas flow path 501 and the convex portion 218d projecting from the upper surface of the heat insulating portion 218 toward the gas flow path 501 do not come into contact with each other.
- the convex portions 204d and 218d are alternately provided so as not to overlap each other in a plan view.
- the heights of the protrusions 204d and 218d are heights that do not block the gas flow path 501, that is, heights that are less than the distance X, respectively.
- the number of convex portions 204d and 218d provided in the gas flow path 501 is not particularly limited.
- the protrusion 500 is provided with a gas vent hole 204e for communicating the gas flow path 501 and the exhaust passage 206, as illustrated in FIGS. 8 (c) and 8 (d), respectively.
- the degassing hole 204e is formed as, for example, a slit-shaped through hole.
- the degassing hole 204e may be composed of a plurality of holes.
- the gas in the gas flow path 501 can be discharged to the exhaust passage 206 through the gas vent hole 204e. This makes it possible to suppress the intrusion of the processing gas into the region near the furnace ostium where the temperature is particularly low even in the low temperature region, and as a result, the surface of the member provided in the region near the furnace ostium, for example, the seal cap. It is possible to reliably prevent the by-products from adhering to the upper surface of the 219 and the side surface of the rotating shaft 255. Further, it is possible to increase the supply amount of the inert gas supplied from the second inert gas supply system.
- the gas flow path 501 is configured in a stepped shape, for example, and a plurality of gas flow paths having a small conductance are configured.
- two gas flow paths 501a and 501b are configured.
- a heat insulating cylinder 218b having a two-stage structure in which the outer diameter of the upper stage portion is larger than the outer diameter of the boat 217 is provided.
- the side wall 204b has a vertical portion and a horizontal portion, and the side wall 204b constitutes an overhanging portion 500c (first overhanging portion) as a protruding portion 500.
- a side wall 204f having a vertical portion and a horizontal portion extending outward in the radial direction of the inner tube 204 from the lower end of the vertical portion is provided between the side wall 204b and the side wall 204c, and the side wall 204f serves as a protruding portion 500.
- the overhanging portion 500d (second overhanging portion) is configured.
- the outer diameter of the vertical portion of the side wall 204f is equal to the outer diameter of the horizontal portion of the side wall 204b, and the outer diameter of the horizontal portion of the side wall 204f is equal to the outer diameter of the side wall 204c.
- the gas flow path 501a is formed by the space between the bottom surface of the overhanging portion 500c (the bottom surface of the horizontal portion of the side wall 204b) and the outer peripheral portion of the upper surface of the upper portion of the heat insulating cylinder 218b, and the overhanging portion is formed.
- the gas flow path 501b is formed by the space between the bottom surface of 500d (the bottom surface of the horizontal portion of the side wall 204f) and the exposed upper surface of the lower portion of the heat insulating cylinder 218b.
- the distance Xa between the bottom surface of the overhanging portion 500c and the upper surface of the upper portion of the heat insulating cylinder 218b and the distance Xb between the bottom surface of the overhanging portion 500d and the upper surface of the lower portion of the heat insulating cylinder 218b are as described above. It can be in the same range as the distance X.
- the distance Yb between the side surface of the lower portion of the 218b can be in the same range as the above-mentioned distance Y, respectively.
- the distance D2a between the side surface of the upper part of the heat insulating cylinder 218b and the vertical part of the side wall 204f and the distance D2b between the side surface of the lower part of the heat insulating cylinder 218b and the side wall 204c are the same as the above-mentioned distance D2, respectively.
- the distance Xa is shorter than the distance Ya (distance Xa ⁇ distance Ya), the distance Xb is shorter than the distance Yb (distance Xb ⁇ distance Yb), and the distance Xa is the distance D2a, as in the above embodiment. It is preferably shorter (distance Xa ⁇ distance D2a) and the distance Xb is shorter than the distance D2b (distance Xb ⁇ distance D2b).
- the distance Xa and the distance Xb may be the same or different, the distance Ya and the distance Yb may be the same or different, and the distance D2a and the distance D2b may be the same or different.
- a space 502 formed by the side surface of the upper portion of the heat insulating cylinder 218b and the vertical portion of the side wall 204f and a gas vent hole 204g communicating with the exhaust passage 206 are provided in the vertical portion of the side wall 204f. May be good. As a result, the space 502 can be exhausted, and the amount of gas flowing into the gas flow path 501b can be reduced. That is, it is possible to surely suppress the invasion of the processing gas into the region near the furnace ostium, and as a result, surely suppress the adhesion of by-products to the surface of the member provided in the region near the furnace ostium. It becomes possible to do.
- the side wall 204c may be provided with a gas vent hole 204g, and even in this case, the same effect can be obtained.
- Modification example 10 In the modified example 10, as shown in FIG. 8 (f), a plurality of gas channels having a small conductance are configured.
- a plurality of heat insulating plates 218c are provided as the heat insulating portion 218, and the heat insulating plate 218c arranged at the uppermost stage has a diameter larger than the outer diameter of the boat 217 and the diameter of the other heat insulating plates 218c. Has a smaller diameter.
- the gas flow path 501a is formed by the space between the bottom surface of the overhanging portion 500c and the outer peripheral portion of the upper surface of the heat insulating plate 218c arranged at the uppermost stage.
- the gas flow path 501b is formed by the space between the bottom surface of the overhanging portion 500d and the outer peripheral portion of the upper surface of the heat insulating plate 218c arranged in the second stage from the top.
- Other configurations can be the same as those of the above-described modification 9. The same effect as that of the above-described embodiment and the modified example 9 can be obtained by this modified example.
- the spare chamber 201a may be communicated with the processing chamber 201 via a partition wall 204h provided with a plurality of gas supply slits (gas supply holes) 400a from the upper portion to the lower portion.
- a partition wall 204h provided with a plurality of gas supply slits (gas supply holes) 400a from the upper portion to the lower portion.
- the projecting portion 500 the first projecting portion provided on the inner circumference of the inner tube 204 and the second projecting portion 201b provided in the opening 201b communicating the processing chamber 201 and the spare chamber 201a.
- a protrusion of the above may be formed.
- a side wall 204b having a vertical portion and a horizontal portion similar to that of the second modification is provided, the arrangement position of the partition wall 204h is adjusted, and the side wall 204b provides an overhanging portion 500c (first) as a protruding portion 500.
- the protruding portion) and the horizontal portion of the partition wall 204h and the side wall 204b may form an overhanging portion 500f (second protruding portion) as the protruding portion 500.
- the gas ejected from the gas supply holes 410a and 420a into the spare chamber 201a is ejected into the processing chamber 201 from each of the gas supply slits 400a.
- the same effect as that of the above-described embodiment and modification can be obtained by this modification. Further, in this modification, it is possible to prevent the processing gas in the spare chamber 201a from entering the low temperature region of the processing chamber 201.
- the processing chamber 201 and the transfer chamber 600 may communicate with each other without providing the seal cap 219. Also in this modified example, the same effect as the above-described embodiment and modified example can be obtained. That is, by providing the projecting portion 500, it is possible to suppress the intrusion of the processing gas into the low temperature region of the processing chamber 201 and the transfer chamber 600, and the surface of the member in the low temperature region and the transfer chamber 600 It is possible to suppress the adhesion of by-products. Further, in this modification, the position of the boat 217 in the height direction during the processing of the wafer 200 can be easily adjusted. Further, in this modification, it is possible to suppress the generation of particles. It should be noted that this modification is not limited to the case shown in FIG. 11, and can be suitably applied to any of the above-described aspects and the embodiments shown in the modifications 1 to 11.
- the protrusion 500 may be composed of a plurality of different members.
- the protrusion 500 is formed by the flange portion 500a (first protrusion) of the above-described embodiment and the overhang portion 500e (second protrusion) formed by the nozzle cover. You may.
- the nozzle cover is provided so as to cover the nozzles 410 and 420 and close the opening 201b. The same effect as that of the above-described embodiment and modification can be obtained by this modification.
- the distance X in the atmospheric pressure atmosphere may be set to 0 (zero). That is, in an atmospheric pressure atmosphere, the bottom surface of the protruding portion 500 and the upper surface (exposed upper surface) of the heat insulating portion 218 may be brought into contact with each other. Even when the bottom surface of the protrusion 500 and the upper surface of the heat insulating portion 218 are in contact with each other in the atmospheric pressure atmosphere, a minute gap is generated between them in the reduced pressure atmosphere, and the gas flow path 501 is formed. In this modification as well, the same effect as that of the above-described embodiment can be obtained.
- the spare chamber 201a may accommodate a third nozzle and a fourth nozzle (not shown).
- the third nozzle and the fourth nozzle can have the same configuration as the nozzles 410 and 420, respectively.
- the gas supply pipes 330 and 340 shown by the broken lines in FIG. 3 are connected to the third nozzle and the fourth nozzle.
- the gas supply pipes 330 and 340 are provided with MFCs 332 and 342 and valves 334 and 344 in this order from the upstream side of the gas flow.
- cleaning gas can be supplied into the processing chamber 201 via the MFC 332, the valve 334, and the third nozzle.
- an inert gas can be supplied into the processing chamber 201 via the MFC 342, the valve 344, and the fourth nozzle.
- the heat equalizing region T1 may be an region including the wafer processing region. That is, the length of the wafer processing region in the wafer arrangement direction may be equal to or less than the length of the heat equalizing region T1 in the wafer arrangement direction.
- the reaction tube has an outer tube 203 and an inner tube 204
- the reaction tube may be configured to have only the outer tube 203 without the inner tube 204.
- the protrusion 500 may be provided on the outer tube 203 below the wafer arrangement region.
- the gas vent hole 204e is configured so that gas can be discharged from the gas flow path 501 to the exhaust pipe 231. Also in this aspect, the same effect as the above-mentioned aspect and modification can be obtained.
- the present invention is not limited to this.
- the raw material gas and the reaction gas may be supplied at the same time.
- the film formation rate can be significantly increased, and the film formation processing time can be shortened.
- the processing gas easily invades the low temperature region, it is possible to suppress the invasion of the processing gas into the low temperature region by providing the protrusion 500 as described above. This makes it possible to reduce the amount of by-products adhering to the surface of the member in the low temperature region. As a result, the time of the cleaning process can be shortened, and the downtime of the substrate processing apparatus can be shortened.
- a nitride film containing the metal element or a metalloid element on a wafer, a nitride film containing the metal element or a metalloid element, a carbon nitride film, an oxide film, an acid carbide film, an acid nitride film, an acid carbon nitride film, a boronitride film, or a boro. It can also be suitably applied when forming a carbon nitride film, a metal element single film, or the like.
- step A as the raw material gas, in addition to Al-containing gas such as TMA gas, Si-containing gas, Ti-containing gas, Ta-containing gas, Zr-containing gas, Hf-containing gas, W-containing gas, Nb-containing gas, and Mo-containing gas Gas, W-containing gas, Y-containing gas, La-containing gas, Sr-containing gas and the like may be used.
- Al-containing gas such as TMA gas, Si-containing gas, Ti-containing gas, Ta-containing gas, Zr-containing gas, Hf-containing gas, W-containing gas, Nb-containing gas, and Mo-containing gas Gas
- W-containing gas, Y-containing gas, La-containing gas, Sr-containing gas and the like may be used as the raw material gas.
- reaction gas other O-containing gas such as O 3 gas, ammonia (NH 3) nitrogen such as a gas (N) containing gas, triethylamine ((C 2 H 5) 3 N, abbreviation: TEA) gas or the like
- Hydrogen (H) -containing gas, carbon (C) -containing gas such as propylene (C 3 H 6 ) gas, boron (B) -containing gas such as trichloroborane (BCl 3 ) gas, phosphorus such as phosphine (PH 3 ) gas (P) Containing gas or the like may be used. Even when these gases are used, the same effects as those of the above-mentioned embodiments and modifications can be obtained.
- the film formation process performed as one step of the manufacturing process of the semiconductor device is given as an example of the process performed by the substrate processing device, but the present disclosure is not limited to this. That is, in addition to the film forming treatment, it can be suitably applied to other substrate treatments such as a treatment of supplying a reaction gas without supplying a raw material gas such as an oxidation treatment and a nitriding treatment. Further, for example, it can be suitably applied to a process performed as one step of a semiconductor device manufacturing process, a process performed as one step of a display device (display device) manufacturing process, a process performed as one step of a ceramic substrate manufacturing process, and the like. .. Also in this aspect, the same effect as the above-mentioned aspect and modification can be obtained. For example, it is possible to suppress deterioration (oxidation) of members in a low temperature region.
- the recipes used for each process are individually prepared according to the processing content and stored in the storage device 121c via a telecommunication line or an external storage device 123. Then, when starting each process, it is preferable that the CPU 121a appropriately selects an appropriate recipe from a plurality of recipes stored in the storage device 121c according to the processing content. This makes it possible to form films of various film types, composition ratios, film qualities, and film thicknesses with good reproducibility with one substrate processing apparatus. In addition, the burden on the operator can be reduced, and each process can be started quickly while avoiding operation mistakes.
- the above recipe is not limited to the case of newly creating, for example, it may be prepared by changing an existing recipe already installed in the board processing apparatus.
- the changed recipe may be installed on the substrate processing apparatus via a telecommunication line or a recording medium on which the recipe is recorded.
- the input / output device 122 included in the existing board processing device may be operated to directly change the existing recipe already installed in the board processing device.
- an example of forming a film using a batch type substrate processing apparatus that processes a plurality of substrates at one time has been described.
- the present disclosure is not limited to the above-described embodiment, and can be suitably applied to, for example, a case where a film is formed by using a single-wafer type substrate processing apparatus that processes one or several substrates at a time.
- an example of forming a film by using a substrate processing apparatus having a hot wall type processing furnace has been described.
- the present disclosure is not limited to the above-described embodiment, and can be suitably applied to the case where a film is formed by using a substrate processing apparatus having a cold wall type processing furnace.
- each processing can be performed under the same processing procedure and processing conditions as those in the above-described embodiment, and the same effects as those in the above-described embodiment can be obtained.
- processing procedure and processing conditions at this time can be the same as the processing procedures and processing conditions such as the above-described aspects and modifications.
- FIG. 16 shows the simulation results.
- ⁇ and ⁇ mark indicate the evaluation result of the substrate processing apparatus (new structure) shown in FIG. 6, and the evaluation result of the substrate processing apparatus (conventional structure) without the protrusion 500, respectively. According to FIG. 16, it can be seen that the new structure can suppress the invasion of gas into the low temperature region as compared with the conventional structure.
- Substrate processing device 121: Controller, 200: Wafer (board), 204: Inner tube, 218: Insulation part, 500: Protruding part
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Abstract
Description
図1に示すように、基板処理装置10は、加熱手段(加熱機構、加熱系)としてのヒータ207が設けられた処理炉202を備える。ヒータ207は円筒形状であり、保持板としてのヒータベース(図示せず)に支持されることにより垂直に据え付けられている。ヒータ207は、ガスを熱で活性化(励起)させる活性化機構(励起部)としても機能する。
上述の基板処理装置10を用い、半導体装置(デバイス)の製造工程の一工程として、ウエハ200上に金属酸化膜を形成する基板処理シーケンス、すなわち、成膜シーケンスの一例について、図14、図15を用いて説明する。以下の説明において、基板処理装置10を構成する各部の動作はコントローラ121により制御される。
処理室201内のウエハ200に対して原料ガスとしてTMAガスを供給するステップ(ステップA)と、
処理室201内のウエハ200に対して反応ガスとしてO3ガスを供給するステップ(ステップC)と、
を非同時に行うサイクルを所定回数(n回、nは1以上の整数)行うことで、ウエハ200上に金属酸化膜としてAlおよびOを含む膜(アルミニウム酸化膜(AlO膜))を形成するステップを行う。
複数枚のウエハ200がボート217に装填(ウエハチャージ)されると、図1に示すように、複数枚のウエハ200を支持したボート217は、ボートエレベータ115により持ち上げられて処理室201内へ搬入(ボートロード)される。この状態で、シールキャップ219は、Oリング220bを介してマニホールド209の下端をシールした状態となる。またこの状態で、図4(a)に示すように、フランジ部500aの底面(端部)と断熱筒218aの上面とが近接し、フランジ部500aの底面と断熱筒218aの上面との間の空間により、コンダクタンスの小さいガス流路501が構成された状態となる。
処理室201内、すなわち、ウエハ200が存在する空間が所望の圧力(真空度)となるように、真空ポンプ246によって真空排気(減圧排気)される。この際、処理室201内の圧力は圧力センサ245で測定され、この測定された圧力情報に基づきAPCバルブ243がフィードバック制御される(圧力調整)。また、処理室201内のウエハ200が所望の処理温度となるように、ヒータ207によって加熱される。この際、処理室201内が所望の温度分布となるように、温度センサ263が検出した温度情報に基づきヒータ207への通電具合がフィードバック制御される(温度調整)。また、回転機構267によるボート217およびウエハ200の回転を開始する。処理室201内の排気、ウエハ200の加熱および回転は、いずれも、少なくとも、ウエハ200に対する処理が終了するまでの間は継続して行われる。このとき、バルブ354を開き、ガス供給管350内へN2ガスを流してもよい。N2ガスは、MFC352により流量調整され、処理室201内の低温領域(例えば断熱筒218aの底面よりも下方の領域)へ供給され、排気管231より排出される。このときのN2ガスの流量は例えば0.1~2slm、好ましくは0.3~0.5slmの範囲内の流量とすることができる。
その後、次の4つのステップ、すなわちステップA~Dを順次実施する。
このステップでは、処理室201内のウエハ200に対してTMAガスを供給する。
処理圧力:1~1000Pa、好ましくは1~100Pa、より好ましくは10~50Pa
TMAガス供給流量:10~2000sccm、好ましくは50~1000sccm、より好ましくは100~500sccm
TMAガス供給時間:1~60秒、好ましく1~20秒、より好ましくは2~15秒
N2ガス供給流量(ガス供給管毎):1~30slm、好ましくは1~20slm、より好ましくは1~10slm
処理温度:室温(25℃)~600℃、好ましくは90~550℃、より好ましくは450~550℃
が例示される。本ステップにおける処理温度の下限値は、後述するステップCで用いるO含有ガスの種類によって適宜変更することができる。
ステップAが終了した後、APCバルブ243は開いたまま、真空ポンプ246により処理室201内を真空排気し、処理室201内に残留する未反応またはAl含有層形成に寄与した後のTMAガスを処理室201内から排除する(残留ガス除去)。このとき、バルブ514,524を開き、ノズル410,420より処理室201内へN2ガスを供給するようにしてもよい。N2ガスはパージガスとして作用する。なお、本ステップでは、N2ガスを常に流し続けてもよく(連続的に供給してもよく)、断続的(パルス的)に供給してもよい。
ステップBが終了した後、処理室201内のウエハ200、すなわち、ウエハ200上に形成された第1の層に対してO3ガスを供給する。
O3ガス供給流量:0.01~40slm、好ましくは5~30slmm、更に好ましくは、20~20slm
O3ガス供給時間:0.01~90秒、好ましくは0.01~30秒、更に好ましくは、0.1~20秒
処理圧力:1~1000Pa、好ましくは1~100Pa、更に好ましくは、10~50Pa
が例示される。他の処理条件は、ステップAにおける処理条件と同様とする。
ステップCが終了した後、ステップBと同様の処理手順により、処理室201内に残留する未反応もしくはAlO層の形成に寄与した後のO3ガスや反応副生成物等を処理室201内から排除する。このとき、処理室201内に残留するガス等を完全に排除しなくてもよい点は、上述のステップBと同様である。
ステップA~Dを順に(非同時に)、すなわち、同期させることなく行うサイクルを1回以上(n回)行うことにより、ウエハ200上に、所望膜厚、所望組成のAlO膜を形成することができる。上述のサイクルは、複数回繰り返すのが好ましい。すなわち、1サイクルあたりに形成される第2層の厚さを所望の膜厚よりも小さくし、第2層を積層することで形成されるAlO膜の膜厚が所望の膜厚になるまで、上述のサイクルを複数回繰り返すのが好ましい。AlO膜の膜厚は、例えば、10~150nm、好ましくは40~100nm、より好ましくは60~80nmとすることができる。AlO膜の膜厚を150nm以下とすることで、表面粗さを小さくすることが可能となる。AlO膜の膜厚を10nm以上とすることで、下地膜との応力差に起因する膜剥がれの発生を抑制することが可能となる。上述のサイクルの繰り返し回数は最終的に形成するAlO膜の膜厚に応じて適宜選択される。判定工程(S307)では、上述のサイクルが所定回数実施されたか否かを判定する。上述のサイクルが所定回数実施されていれば、YES(Y)と判定し、成膜工程(S300)を終了する。上述のサイクルが所定回数実施されていなければ、No(N)と判定し、成膜工程(S300)を再び行う。
成膜工程(S300)が終了した後、ノズル410,420のそれぞれからパージガスとしてのN2ガスを処理室201内へ供給し、排気孔204a、排気路206を介して排気管231より排出する。これにより、処理室201内がパージされ、処理室201内に残留するガスや反応副生成物等が処理室201内から除去される(アフターパージ)。その後、処理室201内の雰囲気が不活性ガス(N2ガス)に置換され(不活性ガス置換)、処理室201内の圧力が常圧に復帰される(大気圧復帰)。
その後、ボートエレベータ115によりシールキャップ219が下降され、マニホールド209の下端が開口される。そして、処理済のウエハ200が、ボート217に支持された状態で、マニホールド209の下端からインナーチューブ204(反応管)の外部に搬出(ボートアンロード)される。処理済のウエハ200は、インナーチューブ204の外部に搬出された後、ボート217より取り出される(ウエハディスチャージ)。
上述の態様によれば、以下に示す1つまたは複数の効果が得られる。
本開示は、上述の態様に限定されず、以下に示す変形例のように変更することができる。これらの変形例は、基板処理装置10の構成等に応じて、任意に組み合わせることができる。
図5(a)、図5(b)、および図7(b)に示すように、突出部500が位置するインナーチューブ204の壁の厚さを、突出部500よりも下側に位置するインナーチューブ204の壁の厚さよりも厚くしてもよい。すなわち、高温領域を水平に取り囲むインナーチューブ204の側壁204bの厚さを、低温領域を水平に取り囲むインナーチューブ204の側壁204cの厚さよりも厚くしてもよい。具体的には、インナーチューブ204は、側壁204bを側壁204cよりも径方向内側に向けて張出させて(突出させて)構成してもよい。本変形例では、側壁204bにより、突出部500としての張出部500bが構成される。本変形例では、張出部500bの底面(側壁204bの底面)と断熱部218の上面との間の空間によりガス流路501が構成される。本変形例においても、上述の態様と同様の効果が得られる。
図6(a)、図6(b)、および図7(c)に示すように、側壁204bは垂直部と、垂直部の下端からインナーチューブ204の径方向外向きに延出する水平部とを有する構成とし、側壁204bにより突出部500としての張出部500cを構成してもよい。本変形例では、側壁204bの水平部の底面と側壁204cの上端部とが当接している。また、側壁204bの垂直部および水平部、側壁204cは、それぞれ、略等しい厚さを有している。また、側壁204bの垂直部の外径は側壁204cの外径よりも小さく、側壁204bの水平部の外径は、側壁204cの外径と等しい。本変形例では、張出部500cの底面(すなわち側壁204bの水平部の底面)と断熱筒218aの上面とによりガス流路501が構成される。
図9(a)に示すように、ボート217に対して凸形状を有する断熱筒218bが設けられていてもよい。すなわち、断熱部218として、ボート217の外径と略等しい外径を有する上段部と、上段部の外径よりも大きな外径を有する下段部との2段構成を有する断熱筒218bが設けられていてもよい。本変形例では、突出部500(フランジ部500a、張出部500b,500c)は、断熱筒218bの下段部の露出された上面(段差部分、以下「露出上面」とも称する)と対向するように設けられている。また、突出部500の底面と断熱筒218bの下段部の露出上面との間の空間によりガス流路501が構成される。本変形例によっても、上述の態様や変形例と同様の効果が得られる。
図9(b)に示すように、断熱部218として、複数の断熱板218cが設けられていてもよい。断熱板218cは、石英やSiC等の耐熱性材料により構成される。本変形例では、突出部500は、最上段に配置された断熱板218cの上面と対向するように設けられている。本変形例では、突出部500の底面と最上段に配置された断熱板218cの上面との間の空間によりガス流路501が形成される。本変形例によっても、上述の態様と同様の効果が得られる。
変形例5,6では、図8(a)、図8(b)にそれぞれ例示するように、ガス流路501にラビリンス構造(迷宮構造)が設けられている。具体的には、突出部500の底面からガス流路501に向かって突出する凸部204dと、断熱部218の上面からガス流路501に向かって突出する凸部218dとが、互いに接触しないように交互に設けられている。すなわち、凸部204d,218dは、それぞれ、平面視において互いに重ならないように交互に設けられている。凸部204d,218dの高さは、それぞれ、ガス流路501を塞ぐことがない高さ、すなわち、距離X未満の高さである。なお、ガス流路501に設ける凸部204d、218dの数は特に限定されない。
変形例7,8では、図8(c)、図8(d)にそれぞれ例示するような、ガス流路501と排気路206とを連通させるガス抜き孔204eを突出部500に設けている。ガス抜き孔204eは、例えばスリット状の貫通孔として形成されている。ガス抜き孔204eは、複数個の孔により構成されていてもよい。
変形例9では、図8(e)に例示するように、ガス流路501を例えば階段状に構成し、コンダクタンスの小さなガス流路を複数構成している。本変形例では、例えば2つのガス流路501a,501bを構成している。具体的には、本変形例では、上段部の外径がボート217の外径よりも大きい2段構成を有する断熱筒218bを設けている。また、変形例2と同様に、側壁204bは、垂直部と水平部とを有する構成とし、側壁204bにより突出部500としての張出部500c(第1の張出部)を構成している。また、垂直部と、垂直部の下端からインナーチューブ204の径方向外向きに延出する水平部とを有する側壁204fを、側壁204bと側壁204cとの間に設け、側壁204fにより突出部500としての張出部500d(第2の張出部)を構成している。なお、側壁204fの垂直部の外径は側壁204bの水平部の外径と等しく、側壁204fの水平部の外径は側壁204cの外径と等しい。本変形例では、張出部500cの底面(側壁204bの水平部の底面)と断熱筒218bの上段部の上面の外周部との間の空間により、ガス流路501aが構成され、張出部500dの底面(側壁204fの水平部の底面)と断熱筒218bの下段部の露出上面との間の空間により、ガス流路501bが構成される。
変形例10では、図8(f)に示すように、コンダクタンスの小さなガス流路を複数構成している。本変形例では、断熱部218として複数の断熱板218cが設けられており、最上段に配置される断熱板218cは、ボート217の外径よりも大きな直径であって他の断熱板218cの直径よりも小さな直径を有している。本変形例では、張出部500cの底面と、最上段に配置された断熱板218cの上面の外周部との間の空間により、ガス流路501aが構成される。また、張出部500dの底面と、上から2段目に配置された断熱板218cの上面の外周部との間の空間により、ガス流路501bが構成される。その他の構成は上述の変形例9と同様とすることができる。本変形例によっても、上述の態様や変形例9と同様の効果が得られる。
予備室201aは、複数のガス供給スリット(ガス供給孔)400aが上部から下部にわたって複数設けられた隔壁204hを介して処理室201と連通されていてもよい。変形例では、図10に示すように、突出部500として、インナーチューブ204の内周に設けられる第1の突出部と、処理室201と予備室201aとを連通する開口201bに設けられる第2の突出部と、を形成してもよい。具体的には、変形例2と同様の垂直部と水平部とを有する側壁204bを設けるとともに、隔壁204hの配置位置を調整し、側壁204bにより突出部500としての張出部500c(第1の突出部)と、隔壁204hと側壁204bの水平部とにより突出部500としての張出部500f(第2の突出部)とを構成してもよい。本変形例では、ガス供給孔410a,420aから予備室201a内に噴出したガスは、ガス供給スリット400aのそれぞれより処理室201内に噴出する。本変形例によっても、上述の態様や変形例と同様の効果が得られる。また本変形例では、予備室201a内の処理ガスが処理室201の低温領域内へ侵入することを抑制することが可能となる。
図11に示すように、シールキャップ219を設けず、処理室201と移載室600とが連通していてもよい。本変形例においても、上述の態様や変形例と同様の効果が得られる。すなわち、突出部500を設けることにより、処理室201の低温領域および移載室600内への処理ガスの侵入を抑制することが可能となり、低温領域内の部材の表面および移載室600内に副生成物が付着することを抑制することが可能となる。また、本変形例では、ウエハ200の処理時のボート217の高さ方向の位置調整が容易となる。また、本変形例では、パーティクルの発生を抑制することも可能となる。なお、本変形例は、図11に示す場合に限らず、上述の態様や変形例1~11に示すいずれの態様にも好適に適用できる。
突出部500を複数の異なる部材により構成してもよい。例えば、図12に示すように、上述の態様のフランジ部500a(第1の突出部)と、ノズルカバーにより形成される張出部500e(第2の突出部)とにより突出部500を構成してもよい。ノズルカバーは、ノズル410,420を覆うとともに開口201bを塞ぐように設けられている。本変形例によっても、上述の態様や変形例等と同様の効果が得られる。
ボート217を回転させることなく基板処理を行う場合には、大気圧雰囲気下における距離Xを0(ゼロ)としてもよい。すなわち、大気圧雰囲気において、突出部500の底面と断熱部218の上面(露出上面)とを接触させてもよい。大気圧雰囲気では突出部500の底面と断熱部218の上面とが接触している場合であっても、減圧雰囲気では、これらの間に微小な隙間が生じ、ガス流路501が構成される。本変形例においても、上述の態様と同様の効果が得られる。
予備室201a内には、ノズル410,420に加えて、第3ノズル、第4ノズル(不図示)が収容されていてもよい。第3ノズルおよび第4ノズルは、それぞれ、ノズル410,420と同様の構成とすることができる。第3ノズル、第4ノズルには、例えば図3に破線で示すガス供給管330,340が接続される。ガス供給管330,340には、ガス流の上流側から順に、MFC332,342、バルブ334,344がそれぞれ設けられている。ガス供給管330からは、例えばクリーニングガスを、MFC332、バルブ334、第3ノズルを介して処理室201内へ供給することが可能となっている。ガス供給管340からは、例えば不活性ガスを、MFC342、バルブ344、第4ノズルを介して処理室201内へ供給することが可能となっている。
図3に点線で示すように、ガス供給管320のMFC322とバルブ324との間にフラッシュタンク(ガス溜め部)321を設け、フラッシュタンク321内に溜めた高圧のO3ガスを処理室201内へ一気に供給してもよい。この場合には、バルブ324を閉じた状態で、フラッシュタンク321内へO3ガスを溜める。そして、フラッシュタンク321内に所定圧、所定量のO3ガスが溜まったら、バルブ324を開く。これにより、フラッシュタンク321内に溜められた高圧のO3ガスが処理室201内へ一気に(パルス的に)供給される。
第2の不活性ガス供給部から低温領域内へ不活性ガスを供給しなくてもよい。この場合であっても突出部500を設けることにより、ウエハ処理領域から低温領域内への処理ガスの侵入を抑制することが可能となる。
ウエハ配列領域(ウエハ処理領域)が均熱領域T1である場合に限らず、均熱領域T1は、ウエハ処理領域を包含する領域であればよい。すなわち、ウエハ配列方向におけるウエハ処理領域の長さはウエハ配列方向における均熱領域T1の長さ以下であればよい。
以上、本開示の態様を具体的に説明したが、本開示は上述の態様に限定されるものではなく、その要旨を逸脱しない範囲で種々変更可能である。
Claims (19)
- 基板を支持する基板支持領域を有する基板支持具と前記基板支持領域の下部に設けられた断熱部とが挿入される反応容器であって、前記反応容器の内壁の前記基板支持領域と対向する部分よりも下側に前記反応容器の内側に向かって突出する突出部の端部が配置される反応容器と、
前記基板に処理ガスを供給するガス供給部と、を有する基板処理装置。 - 前記突出部は、前記突出部の下端底面が、前記断熱部の外側上面と対向する様に構成される
請求項1に記載の基板処理装置。 - 前記突出部の下端底面は、前記断熱部の外側上面と平行に構成される
請求項1または2に記載の基板処理装置。 - 前記断熱部の直径は、前記基板支持具の直径よりも大きく構成される
請求項1~3のいずれか一項に記載の基板処理装置。 - 前記突出部の下端底面と前記断熱部の外側上面との間の空間によりガス流路を構成する様に、前記突出部と前記断熱部が構成される
請求項1~4のいずれか一項に記載の基板処理装置。 - 前記突出部の下端底面と前記断熱部の外側上面との間の距離は
前記突出部の内面と前記断熱部の側面との間の距離よりも短く構成される
請求項1~5のいずか一項に記載の基板処理装置。 - 前記突出部の下端底面と前記断熱部の外側上面との間の距離は
前記断熱部の側面と前記反応容器の前記突出部よりも下側の内壁との間の距離よりも短く構成される
請求項1~6のいずれか一項に記載の基板処理装置。 - 前記突出部の下端底面と前記断熱部の外側上面との間の空間により構成されるガス流路にはラビリンス構造が設けられている
請求項1~7のいずれか一項に記載の基板処理装置。 - 前記突出部が位置する前記反応容器の外壁と前記突出部よりも下側の前記反応容器の外壁は、同じ面に構成される
請求項1~8のいずれか一項に記載の基板処理装置。 - 前記突出部が位置する前記反応容器の外径と前記突出部よりも下側の前記反応容器の外径とが等しい
請求項1~8のいずれか一項に記載の基板処理装置。 - 前記突出部が位置する前記反応容器の壁の厚さは、前記突出部よりも下側の前記反応容器の壁の厚さよりも厚い
請求項1~10のいずれか一項に記載の基板処理装置。 - 前記突出部が位置する前記反応容器の内壁は、前記突出部よりも下側の前記反応容器の内壁よりも前記基板の縁に近接する様に構成される
請求項1~11のいずれか一項に記載の基板処理装置。 - 前記突出部が位置する前記反応容器の外径は、前記突出部よりも下側の前記反応容器の外径よりも小さい
請求項1~8のいずれか一項に記載の基板処理装置。 - 前記突出部は、前記反応容器の内壁の全周にわたって設けられている
請求項1~13のいずれか一項に記載の基板処理装置。 - 前記反応容器内には、基板を処理する処理室と、前記ガス供給部が配置される予備室とが形成されており、
前記突出部は、前記反応容器の内周に設けられる第1の突出部と、
前記処理室と前記予備室とを連通する開口に設けられる第2の突出部と、を有する
請求項1~13のいずれか一項に記載の基板処理装置。 - 前記反応容器は、前記基板支持具が挿入される内筒と、前記内筒の外側に配置され、一端が閉塞した外筒と、で構成され、
前記突出部には、前記ガス流路と、前記内筒と前記外筒との間の空間と、の間を連通するガス抜き孔が形成されている
請求項5~13のいずれか一項に記載の基板処理装置。 - 基板を支持する基板支持領域を有する基板支持具と前記基板支持領域の下部に設けられた断熱部とが挿入される反応容器であって、
前記反応容器の内壁の前記基板支持領域と対向する部分よりも下側に突出部の端部が配置されて構成される反応容器。 - 基板支持領域を有する基板支持具に基板を支持させる工程と、
前記基板支持具を反応容器に挿入し、前記基板支持具の下部に設けられた断熱部の外側上面と前記反応容器の内壁の前記基板支持領域と対向する部分よりも下側に設けられた突出部の端部とを近接させて前記反応容器内の前記基板に対して処理ガスを供給する工程と、
前記反応容器内の雰囲気を排気する工程と、
を有する半導体装置の製造方法。 - 基板支持領域を有する基板支持具に基板を支持させる手順と、
前記基板支持具を反応容器に挿入し、前記基板支持具の下部に設けられた断熱部の外側上面と前記反応容器の内壁の前記基板支持領域と対向する部分よりも下側に設けられた突出部の端部とを近接させて前記反応容器内の前記基板に対して処理ガスを供給させる手順と、
前記反応容器内の雰囲気を排気させる手順と、をコンピュータによって基板処理装置に実行させるプログラムが記録されたコンピュータ読み取り可能な記録媒体。
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