WO2022138599A1 - 基板処理方法、半導体装置の製造方法、基板処理装置、およびプログラム - Google Patents
基板処理方法、半導体装置の製造方法、基板処理装置、およびプログラム Download PDFInfo
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- 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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- C23C16/44—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
- C23C16/4401—Means for minimising impurities, e.g. dust, moisture or residual gas, in the reaction chamber
- C23C16/4408—Means for minimising impurities, e.g. dust, moisture or residual gas, in the reaction chamber by purging residual gases from the reaction chamber or gas lines
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- C23C16/4412—Details relating to the exhausts, e.g. pumps, filters, scrubbers, particle traps
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
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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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- C23C16/45546—Atomic layer deposition [ALD] characterized by the apparatus specially adapted for a substrate stack in the ALD reactor
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45557—Pulsed pressure or control pressure
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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
- C23C16/52—Controlling or regulating the coating process
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- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
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- H01J37/32431—Constructional details of the reactor
- H01J37/32798—Further details of plasma apparatus not provided for in groups H01J37/3244 - H01J37/32788; special provisions for cleaning or maintenance of the apparatus
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
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- H01L21/02107—Forming insulating materials on a substrate
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- 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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- 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
- H01L21/02205—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 the layer being characterised by the precursor material for deposition
- H01L21/02208—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 the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si
- H01L21/02211—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 the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si the compound being a silane, e.g. disilane, methylsilane or chlorosilane
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—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
- H01L21/02205—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 the layer being characterised by the precursor material for deposition
- H01L21/02208—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 the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si
- H01L21/02219—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 the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si the compound comprising silicon and nitrogen
- H01L21/02222—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 the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si the compound comprising silicon and nitrogen the compound being a silazane
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—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
- H01L21/02274—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 in the presence of a plasma [PECVD]
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—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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- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/32—Processing objects by plasma generation
- H01J2237/33—Processing objects by plasma generation characterised by the type of processing
- H01J2237/332—Coating
- H01J2237/3321—CVD [Chemical Vapor Deposition]
Definitions
- This disclosure relates to a substrate processing method, a semiconductor device manufacturing method, a substrate processing device, and a program.
- Semiconductor devices such as memory devices such as flash memory and DRAM and logic devices such as CPU are required to be highly integrated year by year.
- a technique for accurately forming an ultrathin film in a fine circuit pattern is required, and as a film forming method for that purpose, for example, a raw material gas and a reaction gas are alternately alternately applied to a substrate.
- a raw material gas and a reaction gas are alternately alternately applied to a substrate.
- wiring dimensions and the like have tended to become finer, so it is important to improve the film thickness and film quality uniformity formed on the substrate and their reproducibility.
- the film formed on the substrate examples include a silicon nitride film (SiN film), and the SiN film etches a silicon oxide film (SiO film) or the like using, for example, a hydrogen fluoride (HF) aqueous solution. It may be used as an etching stopper layer in some cases.
- a silicon nitride film SiN film
- the SiN film etches a silicon oxide film (SiO film) or the like using, for example, a hydrogen fluoride (HF) aqueous solution. It may be used as an etching stopper layer in some cases.
- HF hydrogen fluoride
- One of the film forming techniques for forming a SiN film is a technique for forming a film at a low temperature using plasma (see, for example, Patent Document 1).
- An object of the present disclosure is to provide a technique for forming a high quality film at a low temperature using plasma.
- A The process of supplying the raw material gas to the substrate in the processing container, (B) A step of exciting and supplying a nitrogen- and hydrogen-containing gas to the substrate in the processing container in a plasma state. (C) A step of exciting and supplying an inert gas to the substrate in the processing container in a plasma state. It has a step of forming a film on the substrate by performing a cycle including the above a predetermined number of times. Provided is a technique for lowering the pressure in the processing container in (c) to be lower than the pressure in the processing container in (b).
- 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 portion 202 of the processing furnace 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 diagram showing a portion 202 of the processing furnace in a cross-sectional view taken along the line AA of FIG.
- FIG. 3 is a schematic configuration diagram of a controller 121 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 121 as a block diagram.
- 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 portion 202 of the processing furnace in a vertical cross-sectional view.
- FIG. 2 is a schematic configuration diagram of a vertical processing furnace
- FIG. 4 is a schematic configuration diagram of an electrode unit in a substrate processing apparatus preferably used in one aspect of the present disclosure, and is a diagram showing the electrode unit in a perspective view.
- FIG. 5 is a diagram showing an example of a processing sequence according to one aspect of the present disclosure.
- FIG. 6 is a diagram showing an example of a processing sequence in the first modification of the present disclosure.
- FIG. 7A is a diagram showing an example in which the distance between a plurality of wafers 200 is the distance between the wafers 200 when the maximum number of wafers 200 that can be supported by the boat 217 is supported.
- FIG. 5 is a diagram showing an example of a processing sequence according to one aspect of the present disclosure.
- FIG. 6 is a diagram showing an example of a processing sequence in the first modification of the present disclosure.
- FIG. 7A is a diagram showing an example in which the distance between a plurality of wafers 200 is the distance between the wafers 200 when the maximum number of wafers 200 that can be
- FIG. 7B is a diagram showing an example in which the spacing between a plurality of wafers 200 is at least twice the spacing between the wafers 200 when the maximum number of wafers 200 that can be supported by the boat 217 is supported.
- FIG. 7C is a diagram showing an example in which the spacing between a plurality of wafers 200 is four times or more the spacing between the wafers 200 when the maximum number of wafers 200 that can be supported by the boat 217 is supported.
- FIG. 8 is a diagram showing the measurement results of the wet etching rate (WER) and the film thickness in the wafer surface of the SiN film of the evaluation sample 1.
- FIG. 9 is a diagram showing measurement results of WER and film thickness in the wafer surface of the SiN film of the evaluation sample 2.
- FIG. 10 is a diagram showing measurement results of WER and film thickness in the wafer surface of the SiN film of the evaluation sample 3.
- FIG. 11 is a diagram showing the measurement results of the WER and the film thickness in the wafer
- the drawings used in the following description are all schematic, and the dimensional relationship of each element, the ratio of each element, etc. shown in the drawings do not always match the actual ones. Further, even between the plurality of drawings, the relationship between the dimensions of each element, the ratio of each element, and the like do not always match.
- the processing furnace 202 has a heater 207 as a temperature controller (heating unit).
- the heater 207 has a cylindrical shape and is vertically installed by being supported by a holding plate.
- the heater 207 also functions as an activation mechanism (thermally excited portion) for activating (exciting) the gas with heat.
- a reaction tube 203 is arranged concentrically with the heater 207.
- the reaction tube 203 is made of a heat-resistant material such as quartz (SiO 2 ) or silicon carbide (SiC), and is formed in a cylindrical shape in which the upper end is closed and the lower end is open.
- a manifold 209 is arranged concentrically with the reaction tube 203.
- 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. The upper end of the manifold 209 is engaged with the lower end of the reaction tube 203 and is configured to support the reaction tube 203.
- An O-ring 220a as a sealing member is provided between the manifold 209 and the reaction tube 203.
- the reaction tube 203 is installed vertically like the heater 207.
- a processing container (reaction container) is mainly composed of the reaction tube 203 and the manifold 209.
- a processing chamber 201 is formed in the hollow portion of the cylinder of the processing container.
- the processing chamber 201 is configured to accommodate the wafer 200 as a substrate.
- the wafer 200 is processed in the processing chamber 201, that is, in the processing container.
- Nozzles 249a to 249c as first to third supply units are provided in the processing chamber 201 so as to penetrate the side wall of the manifold 209.
- the nozzles 249a to 249c are also referred to as first to third nozzles, respectively.
- the nozzles 249a to 249c are made of a heat-resistant material such as quartz or SiC.
- Gas supply pipes 232a to 232c are connected to the nozzles 249a to 249c, respectively.
- the nozzles 249a to 249c are different nozzles, and each of the nozzles 249a and 249c is provided adjacent to the nozzle 249b.
- the gas supply pipes 232a to 232c are provided with mass flow controllers (MFCs) 241a to 241c which are flow rate controllers (flow control units) and valves 243a to 243c which are on-off valves, respectively, in order from the upstream side of the gas flow. ..
- Gas supply pipes 232d to 232f are connected to the downstream side of the valves 243a to 243c of the gas supply pipes 232a to 232c, respectively.
- the gas supply pipes 232d to 232f are provided with MFCs 241d to 241f and valves 243d to 243f in order from the upstream side of the gas flow.
- the gas supply pipes 232a to 232f are made of a metal material such as SUS.
- the nozzles 249a to 249c are arranged in an annular space in a plan view between the inner wall of the reaction tube 203 and the wafer 200, along the upper part from the lower part of the inner wall of the reaction tube 203.
- the wafers 200 are provided so as to stand upward in the arrangement direction. That is, the nozzles 249a to 249c are provided in the region horizontally surrounding the wafer array region on the side of the wafer array region in which the wafer 200 is arranged, so as to be along the wafer array region.
- the nozzle 249b is arranged so as to face the exhaust port 231a, which will be described later, with the center of the wafer 200 carried into the processing chamber 201 interposed therebetween.
- the nozzles 249a and 249c are arranged so as to sandwich a straight line L passing through the nozzle 249b and the center of the exhaust port 231a along the inner wall of the reaction tube 203 (the outer peripheral portion of the wafer 200) from both sides.
- the straight line L is also a straight line passing through the nozzle 249b and the center of the wafer 200. That is, it can be said that the nozzle 249c is provided on the opposite side of the nozzle 249a with the straight line L interposed therebetween.
- the nozzles 249a and 249c are arranged line-symmetrically, that is, symmetrically with the straight line L as the axis of symmetry.
- Gas supply holes 250a to 250c for supplying gas are provided on the side surfaces of the nozzles 249a to 249c, respectively. Each of the gas supply holes 250a to 250c is opened so as to face (face) the exhaust port 231a in a plan view, and gas can be supplied toward the wafer 200.
- a plurality of gas supply holes 250a to 250c are provided from the lower part to the upper part of the reaction tube 203.
- the raw material (raw material gas) is supplied into the processing chamber 201 via the MFC 241a, the valve 243a, and the nozzle 249a.
- nitrogen (N) and hydrogen (H) -containing gas as a reactant is supplied into the processing chamber 201 via the MFC 241b, the valve 243b, and the nozzle 249b.
- the N and H-containing gas acts as an N source (nitrogen source, nitriding gas, nitriding agent).
- an oxygen (O) -containing gas as a reactant is supplied into the processing chamber 201 via the MFC 241c, the valve 243c, and the nozzle 249c.
- the O-containing gas acts as an O source (oxygen source, oxidizing gas, oxidizing agent).
- the inert gas is supplied into the processing chamber 201 via the MFC 241d to 241f, the valves 243d to 243f, the gas supply pipes 232a to 232c, and the nozzles 249a to 249c, respectively.
- the inert gas acts as a purge gas, a carrier gas, a diluting gas and the like.
- the inert gas can be excited and supplied to the plasma state in the processing chamber 201, and in that case, the inert gas can also act as the reforming gas.
- the raw material gas supply system is mainly composed of the gas supply pipe 232a, the MFC241a, and the valve 243a.
- the gas supply pipe 232b, the MFC241b, and the valve 243b constitute an N and H-containing gas supply system (reaction gas supply system).
- the O-containing gas supply system (reaction gas supply system) is mainly composed of the gas supply pipe 232c, the MFC 241c, and the valve 243c.
- the inert gas supply system is mainly composed of gas supply pipes 232d to 232f, MFC241d to 241f, and valves 243d to 243f.
- the inert gas supply system can also be referred to as a reforming gas supply system.
- any or all of the gas supply systems may be configured as an integrated gas supply system 248 in which valves 243a to 243f, MFC241a to 241f, and the like are integrated.
- the integrated gas supply system 248 is connected to each of the gas supply pipes 232a to 232f, and supplies various gases into the gas supply pipes 232a to 232f, that is, the opening / closing operation of the valves 243a to 243f and the MFC 241a to 241f.
- the flow rate adjusting operation and the like are controlled by the controller 121, which will be described later.
- the integrated gas supply system 248 is configured as an integrated or split type integrated unit, and can be attached to and detached from the gas supply pipes 232a to 232f in units of the integrated unit, and is an integrated gas supply system. It is configured so that maintenance, replacement, expansion, etc. of 248 can be performed in units of integrated units.
- an exhaust port 231a for exhausting the atmosphere in the processing chamber 201 is provided below the side wall of the reaction tube 203. As shown in FIG. 2, the exhaust port 231a is provided at a position facing (facing) the nozzles 249a to 249c (gas supply holes 250a to 250c) with the wafer 200 interposed therebetween in a plan view.
- the exhaust port 231a may be provided along the upper part of the side wall of the reaction tube 203 from the lower part, that is, along the wafer arrangement region.
- An exhaust pipe 231 is connected to the exhaust port 231a.
- the exhaust pipe 231 is made of a metal material such as SUS.
- the exhaust pipe 231 is provided via a pressure sensor 245 as a pressure detector (pressure detection unit) for detecting the pressure in the processing chamber 201 and an APC (Auto Pressure Controller) valve 244 as a pressure regulator (pressure regulator).
- a vacuum pump 246 as a vacuum exhaust device is connected.
- the APC valve 244 can perform vacuum exhaust and vacuum exhaust stop in the processing chamber 201 by opening and closing the valve with the vacuum pump 246 operating, and further, with the vacuum pump 246 operating, the APC valve 244 can perform vacuum exhaust and vacuum exhaust stop. By adjusting the valve opening degree based on the pressure information detected by the pressure sensor 245, the pressure in the processing chamber 201 can be adjusted.
- the APC valve 244 can also be referred to as an exhaust valve.
- the exhaust system is mainly composed of an exhaust pipe 231, an APC valve 244, and a pressure sensor 245.
- the vacuum pump 246 may be included in the exhaust system.
- a seal cap 219 is provided as a furnace palate body that can airtightly close the lower end opening of the manifold 209.
- the seal cap 219 is made of a metal material such as SUS and is formed in a disk shape.
- An O-ring 220b as a sealing member that comes into contact with the lower end of the manifold 209 is provided on the upper surface of the seal cap 219.
- a rotation mechanism 267 for rotating the boat 217 which will be described later, is installed.
- the rotation shaft 255 of the rotation mechanism 267 is made of a metal material such as SUS, and is connected to the boat 217 through the seal cap 219.
- 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 installed outside the reaction tube 203.
- the boat elevator 115 is configured as a transport device (transport mechanism) for loading and unloading (transporting) the wafer 200 into and out of the processing chamber 201 by raising and lowering the seal cap 219.
- a shutter 219s is provided as a furnace palate body that can airtightly close the lower end opening of the manifold 209 in a state where the seal cap 219 is lowered and the boat 217 is carried out from the processing chamber 201.
- the shutter 219s is made of a metal material such as SUS and is formed in a disk shape.
- An O-ring 220c as a sealing member that comes into contact with the lower end of the manifold 209 is provided on the upper surface of the shutter 219s.
- the opening / closing operation of the shutter 219s (elevating / lowering operation, rotating operation, etc.) is controlled by the shutter opening / closing mechanism 115s.
- the boat 217 as a support for supporting the substrate is such that a plurality of wafers, for example, 25 to 200 wafers 200, are vertically aligned and supported in multiple stages in a horizontal posture and in a state of being centered on each other. It is configured. That is, the boat 217 is configured to arrange a plurality of wafers 200 in a horizontal posture and at intervals in the vertical direction.
- the boat 217 is made of a heat resistant material such as quartz or SiC.
- a heat insulating plate 218 made of a heat-resistant material such as quartz or SiC is supported in multiple stages. As shown in FIGS.
- the boat 217 has a plurality of, for example, 3 to 4 columns 217a and a plurality of support portions 217b provided on each of the columns 217a.
- Each of the plurality of support portions 217b is configured to be able to support a plurality of wafers 200, respectively.
- a temperature sensor 263 as a temperature detector is installed in the reaction tube 203. By adjusting the energization condition to the heater 207 based on the temperature information detected by the temperature sensor 263, the temperature in the processing chamber 201 becomes a desired temperature distribution.
- the temperature sensor 263 is provided along the inner wall of the reaction tube 203.
- An electrode 300 for plasma generation is provided outside the reaction tube 203, that is, outside the processing container (processing chamber 201).
- electric power By applying electric power to the electrode 300, it is possible to plasmaize and excite the gas inside the reaction tube 203, that is, inside the processing vessel (processing chamber 201), that is, to excite the gas to a plasma state. It has become.
- exciting a gas to a plasma state is also simply referred to as plasma excitation.
- Capacitively coupled plasma (abbreviation: CCP) is applied to the electrode 300 in the reaction tube 203, that is, in the processing container (processing chamber 201) by applying electric power, that is, high frequency power (RF power). Is configured to generate.
- an electrode 300 and an electrode fixture 301 for fixing the electrode 300 are arranged between the heater 207 and the reaction tube 203.
- the electrode fixture 301 is disposed inside the heater 207
- the electrode 300 is disposed inside the electrode fixture 301
- the reaction tube 203 is disposed inside the electrode 300.
- the electrode 300 and the electrode fixture 301 are placed in an annular space in a plan view between the inner wall of the heater 207 and the outer wall of the reaction tube 203, and the outer wall of the reaction tube 203. It is provided so as to extend in the arrangement direction of the wafer 200 along the upper part from the lower part of the above.
- the electrode 300 is provided in parallel with the nozzles 249a to 249c.
- the electrodes 300 and the electrode fixture 301 are arranged and arranged in a concentric arc shape with the reaction tube 203 and the heater 207, and in non-contact with the reaction tube 203 and the heater 207 in a plan view.
- the electrode fixture 301 is composed of an insulating substance (insulator) and is provided so as to cover at least a part of the electrode 300 and the reaction tube 203, the electrode fixture 301 is covered (insulation cover, insulating wall, etc.). It can also be referred to as an insulating plate) or a cross-sectional arc cover (cross-sectional arc body, cross-sectional arc wall).
- a plurality of electrodes 300 are provided, and these plurality of electrodes 300 are fixedly installed on the inner wall of the electrode fixture 301. More specifically, as shown in FIG. 4, the inner wall surface of the electrode fixture 301 is provided with a protrusion (hook portion) 301a on which the electrode 300 can be hooked, and the electrode 300 is provided with a protrusion. An opening 300c, which is a through hole through which the portion 301a can be inserted, is provided. By hooking the electrode 300 on the protrusion 301a provided on the inner wall surface of the electrode fixture 301 via the opening 300c, the electrode 300 can be fixed to the electrode fixture 301. In FIG.
- FIG. 4 shows an example of fixing nine electrodes 300 to one electrode fixture 301
- FIG. 4 shows an example of fixing twelve electrodes 300 to one electrode fixture 301. There is.
- the electrode 300 is made of an oxidation resistant material such as nickel (Ni).
- the electrode 300 may be made of a metal material such as SUS, aluminum (Al), or copper (Cu), but by making it of an oxidation-resistant material such as Ni, deterioration of electrical conductivity can be suppressed. , It is possible to suppress a decrease in plasma generation efficiency.
- the electrode 300 can be made of a Ni alloy material to which Al is added. In this case, an aluminum oxide film (AlO film), which is an oxide film having high heat resistance and corrosion resistance, is formed on the outermost surface of the electrode 300. It can also be formed into.
- the AlO film formed on the outermost surface of the electrode 300 acts as a protective film (block film, barrier membrane), and can suppress the progress of deterioration inside the electrode 300. This makes it possible to further suppress the decrease in plasma generation efficiency due to the decrease in the electrical conductivity of the electrode 300.
- the electrode fixative 301 is made of an insulating substance (insulator), for example, a heat-resistant material such as quartz or SiC. The material of the electrode fixative 301 is preferably the same as that of the reaction tube 203.
- the electrode 300 includes a first electrode 300a and a second electrode 300b.
- the first electrode 300a is connected to the high frequency power supply (RF power supply) 320 via the matching device 305.
- the second electrode 300b is grounded to the ground and has a reference potential (0V).
- the first electrode 300a is also referred to as a Hot electrode or a HOT electrode
- the second electrode 300b is also referred to as a Ground electrode or a GND electrode.
- the first electrode 300a and the second electrode 300b are each configured as a plate-shaped member having a rectangular front view. At least one first electrode 300a is provided, and at least one second electrode 300b is provided. 1, FIG. 2, and FIG.
- FIG. 4 show an example in which a plurality of the first electrode 300a and the second electrode 300b are provided. Note that FIG. 2 shows an example in which six first electrodes 300a and three second electrodes 300b are provided on one electrode fixture 301, and FIG. 4 shows an example in which one electrode fixture 301 is provided with three second electrodes 300b. , Eight first electrodes 300a and four second electrodes 300b are shown.
- RF power between the first electrode 300a and the second electrode 300b from the RF power supply 320 via the matching device 305, plasma is generated in the region between the first electrode 300a and the second electrode 300b. Will be done. This region is also referred to as a plasma generation region.
- the surface area of the first electrode 300a is preferably twice or more and three times or less the surface area of the second electrode 300b.
- the spread of the potential distribution becomes narrow and the plasma generation efficiency may decrease.
- the surface area of the first electrode 300a exceeds three times the surface area of the second electrode 300b, the potential distribution may extend to the edge portion of the wafer 200, and the wafer 200 may become an obstacle and the plasma generation efficiency may be saturated. .. Further, in this case, electric discharge may also occur at the edge portion of the wafer 200, which may cause plasma damage to the wafer 200.
- the electrodes 300 are arranged in an arc shape in a plan view, and are equally spaced, that is, adjacent electrodes 300 (first electrode 300).
- the distances (gap) between the 1 electrode 300a and the 2nd electrode 300b) are arranged to be equal.
- the electrodes 300 (first electrode 300a, second electrode 300b) are provided in parallel with the nozzles 249a to 249c.
- the electrode fixture 301 and the electrode 300 can also be referred to as an electrode unit.
- the electrode unit is arranged at a position avoiding the nozzles 249a to 249c, the temperature sensor 263, the exhaust port 231a, and the exhaust pipe 231.
- the two electrode units face each other (face-to-face) with the center of the wafer 200 (reaction tube 203) interposed therebetween, avoiding the nozzles 249a to 249c, the temperature sensor 263, the exhaust port 231a, and the exhaust pipe 231.
- An example of placement is shown. Note that FIG.
- the nozzles 249a to 249c, the temperature sensor 263, the exhaust port 231a, and the exhaust pipe 231 can be arranged outside the plasma generation region in the processing chamber 201, and these members can be arranged. It is possible to suppress plasma damage to these members, wear and tear of these members, and generation of particles from these members.
- the electrode 300 that is, the first electrode 300a and the second electrode 300b, constitutes a plasma excitation unit (activation mechanism) that excites (activates) the gas into a plasma state.
- the electrode fixture 301, the matching device 305, and the RF power supply 320 may be included in the plasma excitation section.
- 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 or the like is connected to the controller 121. Further, the external storage device 123 can be 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 processing procedures and conditions to be described later are described, and the like are readablely stored.
- the process recipe is a combination in which each procedure in the process described later is executed by the substrate processing device by the controller 121 so that a predetermined result can be obtained, and functions as a program.
- 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 ports 121d include the above-mentioned MFC 241a to 241f, valves 243a to 243f, pressure sensor 245, APC valve 244, vacuum pump 246, temperature sensor 263, heater 207, rotation mechanism 267, boat elevator 115, shutter opening / closing mechanism 115s, It is connected to the RF power supply 320, the matching unit 305, and the like.
- the CPU 121a is configured to be able 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 MFCs 241a to 241f, opens and closes the valves 243a to 243f, opens and closes the APC valve 244, and adjusts the pressure by the APC valve 244 based on the pressure sensor 245 so as to follow the contents of the read recipe.
- the controller 121 can be configured by installing the above-mentioned program stored in the external storage device 123 in 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, a semiconductor memory such as a USB memory or an SSD, and the like.
- 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.
- a processing sequence for forming a nitride film as an insulating film as a thin film on a wafer 200 as a substrate that is, a film forming sequence, as one step of a semiconductor device manufacturing process using the above-mentioned substrate processing apparatus.
- An example of is described. In the following description, the operation of each part constituting the substrate processing apparatus is controlled by the controller 121.
- (A) A step of supplying the raw material gas to the wafer 200 in the processing container, and (B) A step of exciting the N and H-containing gas into a plasma state and supplying it to the wafer 200 in the processing container.
- (C) A step of exciting and supplying an inert gas to the wafer 200 in the processing container in a plasma state. It has a step of forming a film on the wafer 200 by performing a cycle including, specifically, a cycle in which these are performed non-simultaneously a predetermined number of times (n times, n is an integer of 1 or more).
- the pressure in the processing container in (c) is made lower than the pressure in the processing container in (b).
- FIG. 5 shows an example in which the pressure in the processing container in (c) is made lower than the pressure in the processing container in (a). Further, in FIG. 5, the pressure in the processing container in (c) is made lower than the pressure in the processing container in (b), and the pressure in the processing container in (b) is set in the processing container in (a). An example is shown in which the pressure is lower than the pressure of.
- FIG. 5 in FIG. 5, an example in which the time for exciting and supplying the inert gas to the plasma state in (c) is longer than the time for exciting and supplying the N and H-containing gas to the plasma state in (b). It also shows an example in which the time for exciting and supplying the inert gas to the plasma state in (c) is longer than the time for supplying the raw material gas in (a). More specifically, in FIG. 5, in FIG. 5, the time for exciting and supplying the inert gas to the plasma state in (c) is larger than the time for exciting and supplying the N and H-containing gas to the plasma state in (b). An example is shown in which the time to excite and supply the N and H-containing gas to the plasma state in (b) is longer than the time to supply the raw material gas in (a).
- FIG. 5 further shows an example of purging the inside of the processing container with an inert gas under a non-plasma atmosphere after performing (a) and before performing (b). After performing (b) and before performing (c), the inside of the processing container may be purged with an inert gas in a non-plasma atmosphere.
- the inside of the processing container may be purged with an inert gas in a non-plasma atmosphere.
- an inert gas in a non-plasma atmosphere This makes it possible to suppress mixing of each gas in the processing container in a plasma state, unintended reactions due to the mixing, generation of particles, and the like.
- (a) it is preferable to supply the raw material gas to the wafer 200 from the side of the wafer 200. Further, in (b), it is preferable that the N and H-containing gas is excited to be supplied to the wafer 200 from the side of the wafer 200 in a plasma state. Further, in (c), it is preferable that the inert gas is excited to be supplied to the wafer 200 from the side of the wafer 200 in a plasma state.
- the nitride film includes not only a silicon nitride film (SiN film) but also a nitride film containing carbon (C), oxygen (O), boron (B) and the like. That is, the nitride film is a silicon nitride film (SiN film), a silicon carbon dioxide film (SiCN film), a silicon acid nitride film (SiON film), a silicon acid carbon nitride film (SiOCN film), and a silicon borocarbonic acid nitride film (SiBCN film).
- SiN film silicon nitride film
- SiCN film silicon carbon dioxide film
- SiON film silicon acid nitride film
- SiOCN film silicon acid carbon nitride film
- SiBCN film silicon borocarbonic acid nitride film
- SiBN film Silicon borate nitride film
- SiBOCN film silicon borate carbon nitride film
- SiBON film silicon borate nitride film
- wafer used in the present specification may mean the wafer itself, or may mean a laminate of a wafer and a predetermined layer or film formed on the surface thereof.
- wafer surface 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 is formed on a wafer
- the use of the term "wafer” in the present specification is also synonymous with the use of the term "wafer”.
- the wafer 200 includes a product wafer and a dummy wafer.
- the boat 217 supporting the plurality of wafers 200 is lifted by the boat elevator 115 and carried into the processing chamber 201 (boat load).
- the seal cap 219 is in a state of sealing the lower end of the manifold 209 via the O-ring 220b.
- the inside of the processing chamber 201 is evacuated (vacuum exhaust) by the vacuum pump 246 so as to have a desired pressure (vacuum degree).
- the pressure in the processing chamber 201 is measured by the pressure sensor 245, and the APC valve 244 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 to the heater 207 is feedback-controlled based on the temperature information detected by the temperature sensor 263 so that the inside of the processing chamber 201 has a desired temperature distribution (temperature adjustment).
- the rotation of the wafer 200 by the rotation mechanism 267 is started. 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.
- step 1 the raw material gas is supplied to the wafer 200 in the processing chamber 201.
- valve 243a is opened and the raw material gas flows into the gas supply pipe 232a.
- the flow rate of the raw material gas is adjusted by the MFC 241a, is supplied into the processing chamber 201 via the nozzle 249a, and is exhausted from the exhaust port 231a.
- the raw material gas is supplied to the wafer 200 from the side of the wafer 200 (raw material gas supply).
- the valves 243d to 243f may be opened to supply the inert gas into the processing chamber 201 via each of the nozzles 249a to 249c.
- the processing conditions in this step are Treatment temperature: 250-550 ° C, preferably 400-500 ° C Processing pressure: 100 to 4000 Pa, preferably 100 to 1000 Pa Raw material gas supply flow rate: 0.1 to 3 slm Raw material gas supply time: 1 to 100 seconds, preferably 1 to 30 seconds Inert gas supply flow rate (for each gas supply pipe): 0 to 10 slm Is exemplified.
- the processing temperature in the present specification means the temperature of the wafer 200 or the temperature in the processing chamber 201
- the processing pressure means the pressure in the processing chamber 201.
- the gas supply flow rate: 0 slm means a case where the gas is not supplied.
- a Si-containing layer containing Cl is formed on the outermost surface of the wafer 200 as a base.
- the Si-containing layer containing Cl includes physical adsorption and chemical adsorption of chlorosilane gas molecules on the outermost surface of the wafer 200, physical adsorption and chemical adsorption of molecules of a substance obtained by partially decomposing the chlorosilane gas, and chlorosilane gas. It is formed by the deposition of Si due to thermal decomposition of.
- the Si-containing layer containing Cl may be an adsorption layer (physical adsorption layer or chemical adsorption layer) of a molecule of a chlorosilane-based gas or a molecule of a substance in which a part of the chlorosilane-based gas is decomposed, and the deposition of Si containing Cl. It may be a layer. In the present specification, the Si-containing layer containing Cl is also simply referred to as a Si-containing layer. Under the above-mentioned treatment conditions, the physical adsorption and chemical adsorption of the molecules of the chlorosilane gas or the molecules of the substance obtained by partially decomposing the chlorosilane gas on the outermost surface of the wafer 200 are dominant (priority).
- the Si-containing layer contains an overwhelmingly large amount of adsorption layers (physical adsorption layer and chemical adsorption layer) of molecules of chlorosilane-based gas and molecules of substances in which a part of chlorosilane-based gas is decomposed. Therefore, the Si deposit layer containing Cl is slightly contained or hardly contained.
- the valve 243a is closed and the supply of the raw material gas into the processing chamber 201 is stopped. Then, the inside of the processing chamber 201 is evacuated, and the gas or the like remaining in the processing chamber 201 is removed from the inside of the processing chamber 201 (purge). At this time, the valves 243d to 243f are opened to supply the inert gas into the processing chamber 201.
- the inert gas acts as a purge gas.
- the inside of the processing chamber 201 will be purged in a non-plasma atmosphere.
- the raw material gas remaining in the processing chamber 201 is mixed with the N and H-containing gas supplied into the processing chamber 201 in step 2, and an unintended reaction (for example, a gas phase reaction or a plasma gas phase reaction) due to the mixture. , It is possible to suppress the generation of particles and the like.
- the processing conditions for purging are Treatment temperature: 250-550 ° C, preferably 400-500 ° C Processing pressure: 1 to 20 Pa
- the inert gas supply time: 1 to 600 seconds, preferably 1 to 40 seconds is exemplified.
- a silane-based gas containing silicon (Si) as the main element constituting the film formed on the wafer 200 can be used.
- a silane-based gas for example, a gas containing Si and halogen, that is, a halosilane-based gas can be used.
- Halogen includes chlorine (Cl), fluorine (F), bromine (Br), iodine (I) and the like.
- the halosilane-based gas for example, the above-mentioned chlorosilane-based gas containing Si and Cl can be used.
- the raw material gas examples include monochlorosilane (SiH 3 Cl, abbreviated as MCS) gas, dichlorosilane (SiH 2 Cl 2 , abbreviated as DCS) gas, trichlorosilane (SiHCl 3 , abbreviated as TCS) gas, and tetrachlorosilane (SiCl).
- MCS monochlorosilane
- DCS dichlorosilane
- TCS trichlorosilane
- SiCl tetrachlorosilane
- Chlorosilane-based gas such as hexachlorodisilane gas (Si 2 Cl 6 , abbreviation: HCDS) gas, octachlorotrisilane (Si 3 Cl 8 , abbreviation: OCTS) gas can be used.
- HCDS hexachlorodisilane
- OCTS octachlorotrisilane
- the raw material gas examples include fluorosilane gas such as tetrafluorosilane (SiF 4 ) gas and difluorosilane (SiH 2 F 2 ) gas, tetrabromosilane (SiBr 4 ) gas, and dibromosilane.
- fluorosilane gas such as tetrafluorosilane (SiF 4 ) gas and difluorosilane (SiH 2 F 2 ) gas
- SiBr 4 tetrabromosilane
- dibromosilane tetrabromosilane
- a bromosilane gas such as (SiH 2 Br 2 ) gas
- an iodosilane gas such as tetraiodosilane (SiI 4 ) gas and diiodosilane (SiH 2 I 2 ) gas
- the raw material gas one or more of these can be used.
- a gas containing Si and an amino group that is, an aminosilane-based gas
- the amino group is a monovalent functional group obtained by removing hydrogen (H) from ammonia, a primary amine or a secondary amine, and can be expressed as -NH 2 , -NHR, -NR 2 .
- R represents an alkyl group, and two Rs of ⁇ NR2 may be the same or different.
- raw material gas examples include tetrax (dimethylamino) silane (Si [N (CH 3 ) 2 ] 4 , abbreviation: 4DMAS) gas, tris (dimethylamino) silane (Si [N (CH 3 ) 2 ] 3 H, and so on.
- 3DMAS bis (diethylamino) silane (Si [N (C 2 H 5 ) 2 ] 2 H 2 , abbreviation: BDEAS) gas, bis (territory butyl amino) silane (SiH 2 [NH (C 4 H) 9 )] 2
- Aminosilane gas such as (abbreviated as BTBAS) gas, (diisopropylamino) silane (SiH 3 [N (C 3H 7 ) 2 ], abbreviation: DIPAS) gas can also be used.
- BTBAS bis (diethylamino) silane
- DIPAS bis (territory butyl amino) silane
- Aminosilane gas such as (abbreviated as BTBAS) gas
- DIPAS diisopropylamino) silane
- the raw material gas one or more of these can be used.
- the inert gas examples include nitrogen (N 2 ) gas, argon (Ar) gas, helium (He) gas, neon (Ne) gas, xenon (Xe) gas, krypton (Kr) gas, and radon (Rn).
- nitrogen (N 2 ) gas examples include nitrogen (N 2 ) gas, argon (Ar) gas, helium (He) gas, neon (Ne) gas, xenon (Xe) gas, krypton (Kr) gas, and radon (Rn).
- a rare gas such as gas can be used.
- the inert gas one or more of these can be used. This point is the same in each step described later.
- Step 2 After the step 1 is completed, the N and H-containing gas is excited to be supplied to the wafer 200 in the processing chamber 201, that is, the Si-containing layer formed on the wafer 200 in a plasma state.
- valve 243b is opened to allow N and H-containing gas to flow into the gas supply pipe 232b.
- the flow rate of the N and H-containing gas is adjusted by the MFC 241b, is supplied into the processing chamber 201 via the nozzle 249b, and is exhausted from the exhaust port 231a.
- N and H-containing gas is supplied to the wafer 200 from the side of the wafer 200 (N and H-containing gas supply).
- the valves 243d to 243f may be opened to supply the inert gas into the processing chamber 201 via each of the nozzles 249a to 249c.
- a period may be provided for supplying the N and H-containing gas without exciting the N and H-containing gas to the plasma state. That is, before supplying the plasma-excited N and H-containing gas to the wafer 200, the non-plasma-excited N and H-containing gas is supplied, that is, the non-plasma-excited N and H-containing gas is preflowed. It may be (non-plasma excited N and H-containing gas preflow).
- the N and H-containing gas is supplied without being excited to the plasma state, and after a predetermined period of time, the supply of the N and H-containing gas is continued, and the first electrode 300a and the second electrode 300b are connected. RF power may be applied between them. This makes it possible to generate more stable plasma and active species.
- the processing conditions in this step are Treatment temperature: 250-550 ° C, preferably 400-500 ° C Processing pressure: 2 to 100 Pa, preferably 20 to 70 Pa N and H-containing gas supply flow rate: 0.1 to 10 slm Gas supply time containing N and H: 10 to 600 seconds, preferably 1 to 50 seconds Inert gas supply flow rate (for each gas supply pipe): 0 to 10 slm RF power: 100-1000W RF frequency: 13.56MHz or 27MHz Is exemplified.
- SiN layer silicon nitride layer
- impurities such as Cl contained in the Si-containing layer constitute a gaseous substance containing at least Cl in the process of reforming the Si-containing layer with an active species such as NH x *. , Discharged from the processing chamber 201.
- the SiN layer becomes a layer having less impurities such as Cl as compared with the Si-containing layer formed in step 1.
- the valve 243b is closed and the supply of N and H-containing gas into the processing chamber 201 is stopped.
- step 3 is performed, but before that, the inside of the processing chamber 201 may be purged in a non-plasma atmosphere.
- the gas or the like remaining in the processing chamber 201 can be removed from the processing chamber 201 by the same processing procedure as in the purging in step 1 (purge).
- the plasma-excited N and H-containing gas remaining in the processing chamber 201 is mixed with the plasma-excited inert gas supplied into the processing chamber 201 in step 3, resulting in an unintended reaction (for example, plasma gas phase reaction). , It is possible to suppress the generation of particles and the like.
- the N and H-containing gas acts as a nitriding agent (nitrogen source, nitriding gas).
- the N and H-containing gas is both an N-containing gas and an H-containing gas.
- the N and H-containing gas preferably has an N—H bond.
- N and H-containing gas for example, hydrogen nitride gas such as ammonia (NH 3 ) gas, diimide (N 2 H 2 ) gas, hydrazine (N 2 H 4 ) gas, and N 3 H 8 gas can be used. can.
- hydrogen nitride gas such as ammonia (NH 3 ) gas, diimide (N 2 H 2 ) gas, hydrazine (N 2 H 4 ) gas, and N 3 H 8 gas can be used.
- NH 3 ammonia
- N 2 H 2 diimide
- N 2 H 4 hydrazine
- N 3 H 8 gas hydrazine
- N and H-containing gas for example, nitrogen (N), carbon (C) and hydrogen (H) -containing gas can also be used.
- N, C and H-containing gas for example, an amine-based gas or an organic hydrazine-based gas can be used.
- the N, C and H-containing gas is an N-containing gas, a C-containing gas, an H-containing gas, and an N and C-containing gas.
- N and H-containing gas examples include monoethylamine (C 2 H 5 NH 2 , abbreviated as MEA) gas, diethylamine ((C 2 H 5 ) 2 NH, abbreviated as DEA) gas, and triethylamine ((C 2 H 5 )).
- MEA monoethylamine
- DEA diethylamine
- triethylamine ((C 2 H 5 )
- TEA gas and other ethylamine-based gas monomethylamine (CH 3 NH 2 , abbreviation: MMA) gas, dimethylamine ((CH 3 ) 2 NH, abbreviation: DMA) gas, trimethylamine ((CH 3)) 3 ) 3 N, abbreviation: TMA) gas and other methylamine-based gases
- monomethylhydrazine ((CH 3 ) HN 2 H 2 , abbreviation: MMH) gas, dimethylhydrazine ((CH 3 ) 2 N 2 H 2 , abbreviation : DMH) gas, trimethylhydrazine ((CH 3 ) 2 N 2 (CH 3 ) H, abbreviation: TMH) gas and other organic hydrazine-based gases can be used.
- N and H-containing gas one or more of these can be used.
- Step 3 After the step 2 is completed, the inert gas is excited to be supplied to the wafer 200 in the processing chamber 201, that is, the SiN layer formed on the wafer 200 in a plasma state.
- valves 243d to 243f are opened, and the inert gas is allowed to flow into the gas supply pipes 232d to 232f, respectively.
- the flow rate of the inert gas is adjusted by the MFCs 241d to 241f, and the inert gas is supplied into the processing chamber 201 via each of the nozzles 249a to 249c and exhausted from the exhaust port 231a.
- the inert gas is supplied to the wafer 200 from the side of the wafer 200 (inert gas supply).
- the inert gas is excited to the plasma state, an active species is generated, and the inert gas is supplied to the wafer 200 (plasma-excited inert gas supply).
- the wafer 200 is supplied with an inert gas containing the active species.
- N 2 gas When, for example, N 2 gas is used as the inert gas, the N 2 gas is excited to a plasma state to generate an active species such as N x * (x is an integer of 1 to 2) with respect to the wafer 200. It will be supplied (plasma-excited N2 gas supply). In this case, the wafer 200 is supplied with N 2 gas containing active species such as N * and N 2 * .
- the Ar gas When an Ar gas is used as the inert gas, for example, the Ar gas is excited to a plasma state to generate an active species such as Ar * and is supplied to the wafer 200 (plasma excited Ar gas supply). ). At this time, Ar gas containing an active species such as Ar * is supplied to the wafer 200.
- the He gas When, for example, He gas is used as the inert gas, the He gas is excited to a plasma state to generate an active species such as He * and is supplied to the wafer 200 (plasma excited He gas supply). ). At this time, the wafer 200 is supplied with a He gas containing an active species such as He * .
- these can be mixed in the processing chamber 201 and used as a mixed gas.
- a mixed gas of N 2 gas and Ar gas can be used, a mixed gas of N 2 gas and He gas can be used, and N 2 gas, Ar gas and He gas can be used.
- a mixed gas can also be used.
- the wafer 200 may be provided with a period during which the inert gas is supplied without being excited to the plasma state before the inert gas is excited to the plasma state and supplied. That is, the non-plasma-excited inert gas may be supplied to the wafer 200 before the plasma-excited inert gas is supplied, that is, the non-plasma-excited inert gas may be preflowed (non-plasma). Excited inert gas preflow).
- the inert gas is supplied without being excited to the plasma state, and after a predetermined period of time, the RF power is applied between the first electrode 300a and the second electrode 300b in a state where the supply of the inert gas is continued. Should be applied. This makes it possible to generate more stable plasma and active species.
- the processing conditions in this step are Treatment temperature: 250-550 ° C, preferably 400-500 ° C Processing pressure: 2 to 6 Pa, preferably 2.66 to 5.32 Pa, more preferably 3 to 4 P.
- RF frequency: 13.56MHz or 27MHz Is exemplified.
- the SiN layer formed on the wafer 200 is modified by supplying the wafer 200 with an inert gas excited to a plasma state under the above-mentioned processing conditions. At this time, impurities such as Cl remaining in the SiN layer form a gaseous substance containing at least Cl and the like in the process of reforming the SiN layer with the active species, and are discharged from the treatment chamber 201. As a result, the SiN layer after being modified in this step becomes a layer having less impurities such as Cl than the SiN layer formed in step 2. Further, by this modification, the SiN layer is densified, and the SiN layer after modification in this step has a higher density than the SiN layer formed in step 2.
- the content of impurities such as Cl in the SiN layer formed in step 2 by the reforming reaction with an active species such as NH x * in step 2 is the impurities such as Cl in the Si-containing layer formed in step 1. It is reduced from the content of.
- impurities such as Cl may remain in the SiN layer formed in step 2 because they cannot be completely removed by active species such as NH x * .
- impurities such as Cl that cannot be completely removed by the active species such as NH x * and remain in the SiN layer are removed from the active species different from the active species such as NH x * , for example, N * , N 2 * , Ar. It can be removed by active species such as * and He * .
- the pressure in the processing chamber 201 in this step is lower than the pressure in the processing chamber 201 in step 2. Further, the pressure in the processing chamber 201 in step 3 is made lower than the pressure in the processing chamber 201 in step 2, and the pressure in the processing chamber 201 in step 2 is lower than the pressure in the processing chamber 201 in step 1. It is preferable to lower it.
- the lifetime of active species such as NH x * generated in step 2 can be optimized, and the N x * generated in step 3 can be optimized.
- the lifetime of active species such as Ar * and He * can be optimized.
- the supply flow rate of the inert gas supplied in step 3 is smaller than the supply flow rate of the N and H-containing gas supplied in step 2. It is preferable to do so. That is, by controlling the balance of the supply flow rate of each gas supplied in each step, it is possible to adjust the pressure balance between each step and optimize the lifetime of each active species generated in each step. Become.
- the pressure in the processing chamber 201 it is desirable to reduce the pressure in the processing chamber 201 so as to be 2 Pa or more and 6 Pa or less, preferably 2.66 Pa or more and 5.32 Pa or less, and more preferably 3 Pa or more and 4 Pa or less.
- the processing pressure in this step is lower than the processing pressure in steps 1 and 2.
- the flow rate of the inert gas supplied in this step is made lower than the flow rate of the inert gas supplied in the purge, and further is made lower than the flow rate of the N and H-containing gas supplied in step 2. Therefore, it is possible to promote such a reduction in the processing pressure.
- step 5 shows that the flow rate of the inert gas supplied in this step is lower than the flow rate of the inert gas supplied in the purge, and further lower than the flow rate of the N and H-containing gas supplied in step 2.
- An example is shown in which the processing pressure is promoted to be lowered.
- the pressure in the processing chamber 201 is less than 2 Pa
- ions such as N 2+ , Ar + , and He + generated together with the active species are generated when the inert gas is excited to the plasma state .
- the amount may increase rapidly and excessive ion attack on the wafer 200 may occur.
- the wet etching rate (hereinafter referred to as WER) of the finally formed SiN film may increase, and the wet etching resistance of the finally formed SiN film may decrease. It is considered that this is because the surface layer of the SiN layer is attacked by ions, so that the density of the surface layer of the SiN layer and, by extension, the film density of the finally formed SiN film are lowered.
- this ion attack may occur excessively on the outer peripheral portion of the wafer 200, and the WER of the finally formed SiN film becomes high on the outer peripheral portion of the wafer 200, so that the finally formed SiN film is formed.
- Wet etching resistance tends to decrease at the outer peripheral portion of the wafer 200. That is, this ion attack may deteriorate the in-wafer surface WER uniformity of the SiN film finally formed, that is, the in-wafer surface wet etching resistance uniformity.
- the film structure of the SiN film on the outer peripheral portion of the wafer 200 may be broken, and that portion may change to a sparse film, whereby the film thickness of the SiN film finally formed becomes the wafer. It tends to be thicker at the outer periphery of the 200. That is, this ion attack may deteriorate the uniformity of the film thickness in the wafer surface of the finally formed SiN film.
- this step by setting the pressure in the processing chamber 201 to 2 Pa or more, N 2+ , Ar + , and He generated together with the active species when the inert gas is excited to the plasma state .
- the amount of ions such as + can be reduced, and the generation of ion attack on the wafer 200 can be suppressed.
- the WER of the finally formed SiN film becomes high in the outer peripheral portion of the wafer 200, and the wet etching resistance of the finally formed SiN film decreases in the outer peripheral portion of the wafer 200. It is also possible to eliminate the tendency. That is, by suppressing this ion attack, it is possible to suppress deterioration of the in-wafer surface WER uniformity of the SiN film finally formed, that is, the deterioration of the in-wafer surface wet etching resistance uniformity. Further, by suppressing this ion attack, it is possible to eliminate the tendency that the film thickness of the SiN film finally formed becomes thicker at the outer peripheral portion of the wafer 200. That is, by suppressing this ion attack, it is possible to suppress the deterioration of the film thickness uniformity in the wafer surface of the finally formed SiN film.
- the ion attack suppressing effect can be further enhanced, and the above-mentioned effect can be more sufficiently obtained. Further, in this step, by setting the pressure in the processing chamber 201 to 3 Pa or more, the ion attack suppressing effect can be further enhanced, and the above-mentioned effect can be further sufficiently obtained.
- the pressure in the processing chamber 201 exceeds 6 Pa, the lifetime of active species such as Nx * , Ar * , and He * generated when the inert gas is excited to the plasma state becomes short.
- the active species may be difficult to reach the center of the wafer 200. That is, the proportion of active species such as Nx * , Ar * , and He * generated when the inert gas is excited to the plasma state may increase before reaching the central portion of the wafer 200.
- the WER of the finally formed SiN film may be high in the central portion of the wafer 200, and as a result, the wet etching resistance of the finally formed SiN film may be lowered in the central portion of the wafer 200. ..
- the in-wafer surface WER uniformity of the SiN film finally formed may deteriorate.
- the rate at which active species such as N x * , Ar * , and He * are inactivated before reaching the center of the wafer becomes high, and the effect of film densification at the center of the wafer becomes insufficient.
- the film thickness of the finally formed SiN film may become thicker in the central portion of the wafer 200. That is, the uniformity of the film thickness in the wafer surface of the finally formed SiN film may deteriorate.
- this step by setting the pressure in the processing chamber 201 to 6 Pa or less, the life of the active species such as Nx * , Ar * , and He * generated when the inert gas is excited to the plasma state is used.
- the thyme can be lengthened, and active species such as Nx * , Ar * , and He * can be sufficiently reached to the center of the wafer 200.
- active species such as Nx * , Ar * , and He * can be sufficiently reached to the center of the wafer 200.
- the film thickness of the SiN film finally formed is the center of the wafer 200. It is possible to avoid thickening in the portion. That is, it is possible to suppress deterioration of the film thickness uniformity in the wafer surface of the finally formed SiN film.
- this step by setting the pressure in the processing chamber 201 to 5.32 Pa or less, the effect of improving the lifetime of active species such as Nx * , Ar * , and He * can be further enhanced, as described above. The effect will be more fully obtained. Further, in this step, by setting the pressure in the processing chamber 201 to 4 Pa or less, the effect of improving the lifetime of active species such as N x * , Ar * , and He * can be further enhanced, and the above-mentioned effect can be obtained. You will be able to get more enough.
- the pressure in the processing chamber 201 is 2 Pa or more and 6 Pa or less, preferably 2.66 Pa or more and 5.32 Pa or less, and more preferably 3 Pa or more and 4 Pa or less.
- the time for exciting and supplying the inert gas to the plasma state in this step (step 3) is longer than the time for exciting and supplying the N and H-containing gas to the plasma state in step 2. Further, it is preferable that the time for exciting and supplying the inert gas to the plasma state in this step (step 3) is longer than the time for supplying the raw material gas in step 1. Further, in this step (step 3), the time for exciting and supplying the inert gas to the plasma state is made longer than the time for exciting and supplying the N and H-containing gas to the plasma state in step 2, and step 2 is performed.
- the time for exciting and supplying the N and H-containing gas to the plasma state is longer than the time for supplying the raw material gas in step 1.
- NH x * in step 2 By adjusting the balance of the exposure time of gas and active species to the wafer 200 (hereinafter, also referred to as the exposure time of active species and the exposure time of gas and the like) between each step, NH x * in step 2.
- the reforming reaction caused by the active species such as Nx *, Ar *, He * can be optimized, and the reforming reaction caused by the active species such as Nx * , Ar * , He * can be optimized in step 3.
- step 1 is performed again after step 3 is completed, but before that, the inside of the processing chamber 201 may be purged in a non-plasma atmosphere.
- the gas or the like remaining in the processing chamber 201 can be removed from the processing chamber 201 by the same processing procedure as in the purging in step 1 (purge).
- the plasma-excited inert gas remaining in the processing chamber 201 is mixed with the raw material gas supplied into the processing chamber 201 in step 1, and an unintended reaction (for example, a gas phase reaction or a plasma gas phase reaction) is caused by the mixing. , It is possible to suppress the generation of particles and the like.
- the inert gas examples include nitrogen (N 2 ) gas, argon (Ar) gas, helium (He) gas, neon (Ne) gas, xenon (Xe) gas, krypton (Kr) gas, and radon (Rn).
- nitrogen (N 2 ) gas examples include nitrogen (N 2 ) gas, argon (Ar) gas, helium (He) gas, neon (Ne) gas, xenon (Xe) gas, krypton (Kr) gas, and radon (Rn).
- a rare gas such as gas can be used.
- the inert gas one or more of these can be used.
- examplement a predetermined number of cycles By performing the above-mentioned steps 1, 2 and 3 non-simultaneously, that is, by performing a predetermined number of cycles (n times, n is an integer of 1 or more) without synchronization, the surface of the wafer 200 is used as a base and is placed on the base.
- a film having a predetermined thickness for example, a silicon nitride film (SiN film) having a predetermined thickness can be formed.
- the above cycle is preferably repeated a plurality of times. That is, the thickness of the SiN layer formed per cycle is made thinner than the desired film thickness, and the thickness of the SiN film formed by laminating the SiN layers becomes the desired thickness.
- a silicon carbonitriding layer SiCN layer
- the wafer 200 can be formed by performing the above cycle a predetermined number of times.
- a silicon carbonitriding film SiCN film
- SiCN film can also be formed on the surface of the above.
- the inert gas is supplied into the processing chamber 201 as a purge gas from each of the nozzles 249a to 249c and exhausted from the exhaust port 231a.
- the inside of the treatment chamber 201 is purged, and the gas, reaction by-products, and the like remaining in the treatment chamber 201 are removed from the inside of the treatment chamber 201 (after-purge).
- the atmosphere in the processing chamber 201 is replaced with the inert gas (replacement of the inert gas), and the pressure in the treatment chamber 201 is restored to the normal pressure (return to atmospheric pressure).
- the seal cap 219 is lowered by the boat elevator 115, and the lower end of the manifold 209 is opened. Then, the processed wafer 200 is carried out (boat unloading) from the lower end of the manifold 209 to the outside of the reaction tube 203 while being supported by the boat 217. After the boat is unloaded, the shutter 219s is moved and the lower end opening of the manifold 209 is sealed by the shutter 219s via the O-ring 220c (shutter close).
- the processed wafer 200 is cooled to a predetermined temperature at which it can be taken out while being supported by the boat 217 (wafer cooling).
- the processed wafer 200 cooled to a predetermined temperature that can be taken out is taken out from the boat 217 (wafer discharge).
- the interval (arrangement pitch) of the plurality of wafers 200 is set to support the maximum number of wafers 200 that can be supported by the boat 217. It can also be the spacing (arrangement pitch) of the wafers 200.
- the spacing (arrangement pitch) of the wafers 200 means the spacing (distance) between adjacent wafers 200.
- the film formation process is performed with the 100 wafers 200 supported by the support portion 217b of the boat 217. May be good.
- the spacing (arrangement pitch) of the wafers 200 in FIG. 7A that is, the spacing (arrangement pitch) of the support portions 217b supporting each wafer 200 can be set to, for example, 6 to 12 mm.
- the maximum number of wafers that can be supported by the boat 217 at intervals (arrangement pitch) of a plurality of wafers 200 during the film forming process It may be made larger than the spacing (arrangement pitch) of the wafers 200 when supporting the wafers 200.
- the maximum number of wafers 200 that can be supported by the boat 217 is supported by the spacing (arrangement pitch) of the plurality of wafers 200 when the film forming process is performed.
- the spacing (arrangement pitch) of the wafers 200 in the case may be twice or more.
- the spacing (arrangement pitch) of the wafers 200 can be set to, for example, 12 to 24 mm or more.
- the film thickness of the SiN film finally formed becomes thick in the central portion of the wafer 200. That is, it is possible to sufficiently suppress the deterioration of the film thickness uniformity in the wafer surface of the finally formed SiN film.
- active species such as N x * , Ar * , and He * , especially active species such as N x * , have a relatively short lifetime and are easily deactivated. Therefore, this effect is particularly remarkable in step 3. It will occur.
- the interval (arrangement pitch) of the plurality of wafers 200 when the film forming process is performed is the interval (arrangement pitch) of the wafers 200 when the maximum number of wafers 200 that can be supported by the boat 217 are supported. It may be set to 3 times or more of. For example, when the maximum number of wafers 200 that can be supported by the boat 217 is 120, the film forming process is performed with the 40 wafers 200 supported by the support portion 217b of the boat 217 every two wafers. You may do it.
- the spacing (arrangement pitch) of the wafers 200 can be set to, for example, 18 to 36 mm or more.
- the maximum number of wafers 200 that can be supported by the boat 217 at intervals (arrangement pitch) of the plurality of wafers 200 during the film forming process is used.
- the spacing (arrangement pitch) of the wafers 200 in the case of supporting may be four times or more.
- the spacing (arrangement pitch) of the wafers 200 can be set to, for example, 24 to 48 mm or more.
- the spacing (arrangement pitch) of the wafers 200 is made too large, the number of wafers 200 that can be filmed at one time may decrease, and productivity may decrease. Considering that productivity is a practical level, the spacing (arrangement pitch) of the wafers 200 is 5 times or less the spacing (arrangement pitch) of the wafers 200 when the maximum number of wafers 200 that can be supported by the boat 217 is supported. Is preferable. In this case, the spacing (arrangement pitch) of the wafers 200 can be set to, for example, 30 to 60 mm or less.
- the spacing (arrangement pitch) of the plurality of wafers 200 should be, for example, 12 mm or more and 60 mm or less. It can be said that it is preferable to do so.
- the spacing (arrangement pitch) of the plurality of wafers 200 should be, for example, 15 mm or more and 60 mm or less. Is preferable.
- the spacing (arrangement pitch) of the plurality of wafers 200 may be, for example, 18 mm or more and 60 mm or less. It is more preferably 24 mm or more and 60 mm or less, further preferably 36 mm or more and 60 mm or less, and further preferably 48 mm or more and 60 mm or less. These can be said to be the arrangement pitch of the wafer 200 in which the probability of reaching the central portion of the active species wafer 200 is more important.
- the spacing (arrangement pitch) of the plurality of wafers 200 should be, for example, 12 mm or more and 48 mm or less. It is more preferably 12 mm or more and 40 mm or less, further preferably 12 mm or more and 36 mm or less, and further preferably 12 mm or more and 30 mm or less. These can be said to be the arrangement pitch of the wafer 200 with more emphasis on productivity.
- the upper limit and lower limit of the numerical range of the interval (arrangement pitch) of the plurality of wafers 200 described above are appropriately set in consideration of the balance between the probability that the active species reaches the central portion of the wafer 200 and the productivity. Can be combined. Further, in these cases, the interval (arrangement pitch) of the support portions 217b is not limited to the case where the wafer 200 is supported every few wafers by the boat 217 in which the interval (arrangement pitch) of the support portions 217b is, for example, 6 to 12 mm. The wafer 200 may be supported by the boat 217 having the above numerical range.
- step 3 The relatively life generated in step 3 is achieved by adjusting the pressure balance between each step so that the pressure in the processing chamber 201 in step 3 is lower than the pressure in the processing chamber 201 in step 2. It is possible to optimize the lifetime of active species such as Nx * , Ar * , and He * , which have a short time and tend to be deactivated. This makes it possible to enhance the modification effect of the SiN layer in step 3. As a result, the WER of the finally formed SiN film can be lowered, and the wet etching resistance of the finally formed SiN film can be improved. Further, the SiN film finally formed can be densified, and a SiN film having a high film density can be formed.
- active species such as Nx * , Ar * , and He *
- the supply flow rate of the inert gas supplied in step 3 is smaller than the supply flow rate of the N and H-containing gas supplied in step 2. It is preferable to do so.
- the pressure in the processing chamber 201 in step 3 is lower than the pressure in the processing chamber 201 in step 2, and the pressure in the processing chamber 201 in step 2 is lower than the pressure in the processing chamber 201 in step 1. It is preferable to adjust the pressure balance between each step so as to do so.
- the lifetime of active species such as NH x * generated in step 2 can be optimized, and the lifetime generated in step 3 is relatively short, and N x * and Ar tend to be deactivated. It is possible to optimize the lifetime of active species such as * and He * . In particular, it is possible to prolong the lifetime of active species such as N x * , Ar * , and He * generated in step 3. This makes it possible to enhance the modification effect of the SiN layer in step 3.
- the WER of the finally formed SiN film can be lowered, and the wet etching resistance of the finally formed SiN film can be improved. That is, it is possible to improve the film quality of the finally formed SiN film, and it is possible to form a high-quality SiN film.
- step 3 By setting the pressure in the processing chamber 201 in step 3 to 2 Pa or more, preferably 2.66 Pa or more, more preferably 3 Pa or more, the inert gas is excited to the plasma state together with the active species.
- the amount of ions such as N 2+, Ar +, and He + generated in the wafer can be reduced, and the ion attack on the wafer 200 can be suppressed.
- the ion attack it is possible to eliminate the tendency that the WER of the finally formed SiN film becomes high in the outer peripheral portion of the wafer 200, and the wet etching resistance of the finally formed SiN film becomes the wafer. It is possible to eliminate the tendency of the decrease in the outer peripheral portion of the 200. That is, it is possible to suppress deterioration of the in-wafer surface WER uniformity of the SiN film finally formed, that is, the deterioration of the in-wafer surface wet etching resistance uniformity. Further, by suppressing the ion attack, it is possible to eliminate the tendency that the film thickness of the SiN film finally formed becomes thicker at the outer peripheral portion of the wafer 200. That is, it is possible to suppress deterioration of the film thickness uniformity in the wafer surface of the finally formed SiN film.
- the film thickness of the SiN film finally formed is the center of the wafer 200. It is possible to avoid thickening in the portion. That is, it is possible to suppress deterioration of the film thickness uniformity in the wafer surface of the finally formed SiN film.
- the time for exciting and supplying the inert gas to the plasma state in step 3 is longer than the time for exciting and supplying the N and H-containing gas to the plasma state in step 2.
- the modification reaction caused by the active species such as Nx * , Ar * , He * in step 3 can be optimized. That is, it is possible to more appropriately generate the above-mentioned reforming reaction.
- N x * and Ar *. , He * and other active species may have an insufficient modification effect.
- the exposure time of the gas or the like to the wafer 200 between each step is set so that the time for exciting and supplying the inert gas to the plasma state in step 3 is longer than the time for supplying the raw material gas in step 1. It is preferable to adjust the balance of. This makes it possible to optimize the reforming reaction caused by active species such as N x * , Ar * , and He * in step 3. That is, it is possible to more appropriately generate the above-mentioned reforming reaction.
- the time for exciting and supplying the inert gas to the plasma state in step 3 is shorter than the time for supplying the raw material gas in step 1, it is modified by active species such as N x * , Ar * , and He *. The quality effect may be inadequate.
- the time for exciting and supplying the inert gas to the plasma state in step 3 is longer than the time for exciting and supplying the N and H-containing gas to the plasma state in step 2, and the N and H-containing gas is contained in step 2. It is possible to adjust the balance of the exposure time of gas etc. to the wafer 200 between each step so that the time for exciting and supplying the gas to the plasma state is longer than the time for supplying the raw material gas in step 1. preferable.
- This makes it possible to optimize the reforming reaction caused by an active species such as NH x * in step 2, and the reforming caused by an active species such as N x * , Ar * , He * in step 3.
- the reaction can be optimized.
- the reforming reaction with active species such as N x * , Ar * , and He * in step 3 can be further optimized. That is, it is possible to more appropriately generate the above-mentioned reforming reaction.
- step 3 the generation of abnormal discharge is prevented by exciting the inert gas to the plasma state inside the processing container by applying electric power to the electrode 300 provided outside the processing container. Is possible. As a result, it is possible to suppress damage to the members in the processing container and damage to the wafer 200, and further, it is possible to suppress the generation of particles.
- an electrode for plasma generation is provided in the plasma generation chamber communicating with the inside of the processing vessel, and the inert gas is excited to the plasma state under the pressure conditions as described above in the plasma generation chamber to enter the treatment vessel.
- Abnormal discharge may occur when ejecting. That is, in this case, a local discharge that is difficult to control may randomly occur in the vicinity of the ejection port where the active species generated in the plasma generation chamber is ejected from the plasma generation chamber into the processing vessel.
- damage may occur to the inner wall of the partition wall constituting the plasma generation chamber, the nozzle provided in the plasma generation chamber, and the like.
- the inert gas is excited to the plasma state inside the processing container, thereby preventing the above-mentioned abnormal discharge from occurring. It is possible to suppress damage to the members in the processing container and damage to the wafer 200, and it is possible to suppress the generation of particles. The lower the processing pressure, the more remarkable this effect will be.
- step 2 by applying electric power to the electrode 300 provided outside the processing container, the N and H-containing gas is excited to the plasma state inside the processing container, thereby preventing the occurrence of abnormal discharge. It becomes possible to do. As a result, it is possible to suppress damage to the members in the processing container and damage to the wafer 200, and further, it is possible to suppress the generation of particles.
- the spacing (arrangement pitch) of the plurality of wafers 200 is larger than the spacing (arrangement pitch) of the wafers 200 when the maximum number of wafers 200 that can be supported by the boat 217 is supported.
- the size By increasing the size, it becomes possible to suppress deactivation due to collision with the wafer 200 of the active species. As a result, it is possible to increase the probability that the active species will reach the central portion of the wafer 200.
- the interval (arrangement pitch) of a plurality of wafers 200 is twice the interval (arrangement pitch) of the wafers 200 when the maximum number of wafers 200 that can be supported by the boat 217 is supported.
- the above may be adopted.
- the spacing (arrangement pitch) of the wafers 200 can be set to, for example, 12 to 24 mm or more.
- the interval (arrangement pitch) of a plurality of wafers 200 is set to the interval (arrangement pitch) of the wafers 200 when the maximum number of wafers 200 that can be supported by the boat 217 are supported. It may be tripled or more.
- the spacing (arrangement pitch) of the wafers 200 can be set to, for example, 18 to 36 mm or more.
- the interval (arrangement pitch) of a plurality of wafers 200 is set to the interval (arrangement pitch) of the wafers 200 when the maximum number of wafers 200 that can be supported by the boat 217 are supported. It may be quadrupled or more.
- the spacing (arrangement pitch) of the wafers 200 can be set to, for example, 24 to 48 mm or more.
- a SiN film may be formed on the wafer 200 by the process sequence shown in FIG. 6 and the following.
- (A) A step of supplying the raw material gas to the wafer 200 in the processing container, and (C) A step of exciting and supplying an inert gas to the wafer 200 in the processing container in a plasma state.
- a film is formed on the wafer 200 by performing a cycle including the above, specifically, a cycle in which these are performed non-simultaneously a predetermined number of times.
- the above-mentioned processing sequence shows an example in which a cycle in which (a) and (c) are performed non-simultaneously is performed a predetermined number of times with a step of purging the inside of the processing container sandwiched between them.
- the pressure in the processing container in (c) is 2 Pa or more and 6 Pa or less, preferably 2.66 Pa or more and 5.32 Pa or less, and more preferably 3 Pa or more and 4 Pa or less.
- the raw material gas in this modification is monosilylamine ((SiH 3 ) NH 2 , abbreviation: MSA) gas, disilylamine ((SiH 3 ) 2 NH, abbreviation: DSA) gas.
- Trisilylamine ((SiH 3 ) 3N , abbreviation: TSA) gas and the like can be used.
- the raw material gas one or more of these can be used. Among these, it is preferable to use TSA containing three Si—N bonds as the raw material gas.
- These raw material gases can be supplied to the wafer 200 from the above-mentioned raw material gas supply system.
- the processing conditions can be the same as the processing conditions in step 1 of the processing sequence of the above-described embodiment.
- N2 gas or a rare gas such as Ar gas, He gas, Ne gas, Xe gas can be used.
- Ar gas Ar gas
- He gas He gas
- Ne gas Ne gas
- Xe gas Xe gas
- the inert gas one or more of these can be used.
- N2 gas among these N2 gas among these as the inert gas.
- These inert gases can be supplied to the wafer 200 from the above-mentioned inert gas supply system.
- the processing conditions can be the same as the processing conditions in step 3 of the processing sequence of the above-described embodiment.
- the cycle described above may further include a step of supplying the O-containing gas to the wafer 200.
- a silicon oxynitride film SiON film
- the O-containing gas may be supplied to the wafer 200 without being excited to the plasma state, or the O-containing gas may be excited to be supplied to the plasma state. That is, in the film forming process, a SiON film may be formed on the wafer 200 by the process sequence shown below.
- the purging before and after the supply of the plasma-excited inert gas can be omitted.
- the O-containing gas can be supplied to the wafer 200 from the above-mentioned O-containing gas supply system.
- the processing conditions can be the same as the processing conditions in step 2 of the processing sequence of the above-described embodiment.
- the hydrogen (H) -containing gas may be supplied together with the O-containing gas.
- the H-containing gas can be supplied from, for example, a raw material gas supply system or an N and H-containing gas supply system.
- O-containing gas examples include oxygen (O 2 ) gas, ozone (O 3 ) gas, water vapor (H 2 O gas), hydrogen peroxide (H 2 O 2 ) gas, and nitrogen oxide (N 2 O) gas.
- oxygen (O 2 ) gas examples include oxygen (O 2 ) gas, ozone (O 3 ) gas, water vapor (H 2 O gas), hydrogen peroxide (H 2 O 2 ) gas, and nitrogen oxide (N 2 O) gas.
- Nitrogen monoxide (NO) gas Nitrogen dioxide (NO 2 ) gas, carbon monoxide (CO) gas, carbon dioxide (CO 2 ) gas and the like can be used.
- NO Nitrogen monoxide
- CO carbon monoxide
- CO 2 carbon dioxide
- H-containing gas When the H-containing gas is supplied together with the O-containing gas, for example, hydrogen (H 2 ) gas, deuterium ( 2 H 2 ) gas, or the like can be used as the H-containing gas.
- 2 H 2 gas is also referred to as D 2 gas.
- the H-containing gas one or more of these can be used.
- the same effect as the above-mentioned aspect can be obtained. That is, even when the cycle further includes a step of supplying an O-containing gas to the wafer 200 and a SiON film is formed on the wafer 200, the same effect as described above can be obtained.
- the above-mentioned cycle in the first modification may further include a step of supplying the O-containing gas to the wafer 200.
- a SiON film on the wafer 200.
- the O-containing gas may be supplied to the wafer 200 without being excited to the plasma state, or the O-containing gas may be excited to be supplied to the plasma state. That is, in the film forming process, a SiON film may be formed on the wafer 200 by the process sequence shown below.
- the purging before and after the supply of the plasma-excited inert gas can be omitted as in the above-described embodiment.
- the cycle further includes a step of supplying an O-containing gas to the wafer 200 and a SiON film is formed on the wafer 200, the same effects as those described above and the first modification can be obtained. Be done.
- step 1 the composition and modification effect of the outermost surface of the film finally formed may be different from the other parts. Therefore, as in the processing sequence shown below, after the final cycle is completed, steps 2 and 3 are performed, and the degree of nitriding by step 2 and the degree of modification by step 3 are the same as those of the layers formed so far. As described above, it is preferable to finely adjust the film quality on the outermost surface of the finally formed film.
- a predetermined number of times (n times, n is an integer of 1 or more) with steps 1, 2 and 3 as one cycle
- steps 1, 2 and 3 as one cycle
- steps 1 and 2 are performed.
- step 3 may be performed, and this cycle may be performed a predetermined number of times (n times, n is an integer of 1 or more).
- steps 2 and 3 may be performed a plurality of times (m times, m is an integer of 2 or more), and this cycle may be performed a predetermined number of times (n times, n is an integer of 1 or more).
- These processing sequences can be expressed as follows. In these cases as well, the same effects as those described above can be obtained.
- Step 1 ⁇ Step 2 ⁇ Step 3 ⁇ n [(Step 1 ⁇ Step 2) ⁇ m ⁇ Step 3] ⁇ n [Step 1 ⁇ (Step 2 ⁇ Step 3) ⁇ m] ⁇ n
- steps 1 and 2 are performed with a plurality of wafers 200 supported by the boat 217 as shown in FIG. 7 (a), and the plurality of wafers are supported as shown in FIG. 7 (b) or FIG. 7 (c).
- the wafer 200 may be supported by the boat 217 and the step 3 may be performed. That is, the spacing (arrangement pitch) P 1 of the plurality of wafers 200 in step 3 is made larger than the spacing (arrangement pitch) P 2 of the plurality of wafers 200 in steps 1 and 2 (P 1 > P 2 ). You may do it. In this case, for example, P 1 ⁇ 2 P 2 is preferable, P 1 ⁇ 3 P 2 is more preferable, and P 1 ⁇ 4 P 2 is further preferable.
- the spacing (arrangement pitch) of the support portions 217b is not limited to the case where the wafer 200 is supported every few wafers by the boat 217 in which the spacing (arrangement pitch) of the support portions 217b is, for example, 6 to 12 mm.
- the wafer 200 may be supported by the boat 217 whose pitch) itself is within the above numerical range.
- a first processing chamber and a second processing chamber having the same configuration as the processing chamber 201 are prepared, steps 1 and 2 are performed in the first processing chamber, and step 3 is performed in the second processing chamber. You may do so. Also in this case, the same effect as the above-described aspect can be obtained. Further, in this case, the number of wafers 200 for performing steps 1 and 2 can be increased to be larger than the number of wafers 200 for performing step 3.
- step 1 is performed with a plurality of wafers 200 supported by the boat 217 as shown in FIG. 7 (a), and the plurality of wafers are supported as shown in FIG. 7 (b) or FIG. 7 (c).
- Steps 2 and 3 may be performed with the 200 supported by the boat 217. That is, the spacing (arrangement pitch) P 1 of the plurality of wafers 200 in steps 2 and 3 is made larger than the spacing (arrangement pitch) P 2 of the plurality of wafers 200 in step 1 (P 1 > P 2 ). You may do it. In this case, for example, P 1 ⁇ 2 P 2 is preferable, P 1 ⁇ 3 P 2 is more preferable, and P 1 ⁇ 4 P 2 is further preferable.
- the spacing (arrangement pitch) of the support portions 217b is not limited to the case where the wafer 200 is supported every few wafers by the boat 217 having a spacing (arrangement pitch) of, for example, 6 to 12 mm, and the spacing between the support portions 217b.
- the wafer 200 may be supported by the boat 217 whose (arrangement pitch) itself is within the above numerical range.
- a first processing chamber and a second processing chamber having the same configuration as the processing chamber 201 are prepared, step 1 is performed in the first processing chamber, and steps 2 and 3 are performed in the second processing chamber. You may do so. Also in this case, the same effect as the above-described aspect can be obtained. Further, in this case, the number of wafers 200 for performing step 1 can be increased to be larger than the number of wafers 200 for performing steps 2 and 3.
- inductively coupled plasma Inductively Coupled Plasma, abbreviated as ICP
- capacitively coupled plasma Capacitively Coupled Plasma, abbreviated as CCP
- 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 the plurality of recipes stored in the storage device 121c according to the processing content. This makes it possible to form films having various film types, composition ratios, film qualities, and film thicknesses with good reproducibility with one substrate processing device. 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 device.
- 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-mentioned various aspects and various modifications, and is also suitable for forming a film using, for example, a single-wafer type substrate processing apparatus that processes one or several substrates at a time. Applicable.
- 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-mentioned various aspects and various modifications, 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 procedures and conditions as the processing procedures and processing conditions in the above-mentioned various aspects and various modifications, and the above-mentioned various aspects and various modifications can be performed.
- the same effect as the example can be obtained.
- the above-mentioned various aspects and various modifications can be used in combination as appropriate.
- the processing procedure and processing conditions at this time can be, for example, the same as the processing procedures and processing conditions in the above-mentioned various aspects and various modified examples.
- a SiN film was formed on the wafer by the processing sequence in the above-mentioned embodiment.
- DCS gas was used as the raw material gas
- NH 3 gas was used as the N and H-containing gas
- N 2 gas was used as the inert gas.
- the processing pressure in step 3 is set to the following four pressure conditions (pressure conditions 1 to 4), a SiN film is formed on the wafer under each condition, and evaluation samples 1 to 4 of four types of SiN films are formed.
- the processing conditions other than the processing pressure in step 3 are the same processing conditions within the processing condition range in the above-described embodiment, and the wafer spacing (arrangement pitch) is 15 to 40 mm in each case. And said.
- Pressure condition 1 0.01 Torr (1.33 Pa)
- Pressure condition 2 0.02 Torr (2.66 Pa)
- Pressure condition 3 0.04 Torr (5.32 Pa)
- Pressure condition 4 0.06 Torr (7.98Pa)
- FIGS. 8 to 11 show the WER and the film thickness in the wafer surface of each SiN film of the evaluation samples 1 to 4.
- the results are shown in FIGS. 8 to 11.
- the horizontal axis of FIGS. 8 to 11 indicates the distance (radius) from the center of the wafer 200, where 0 mm is the central portion of the wafer, and 150 mm and ⁇ 150 mm are the outer peripheral portion (edge portion) of the wafer 200. Is shown.
- the vertical axis on the left side of FIGS. 8 to 11 indicates WER in an arbitrary unit (au), and the vertical axis on the right side indicates the film thickness in an arbitrary unit (a.u.).
- ⁇ indicates the film thickness
- ⁇ indicates WER. 8 to 11 show the measurement results of the WER and the film thickness in the wafer surface of the SiN films of the evaluation samples 1 to 4, respectively.
- the WER of the SiN film of the evaluation sample 4 was high in the center of the wafer because of active species such as N * and N 2 * generated when N 2 gas was plasma-excited under pressure condition 4, especially. It is considered that the cause is that the rate of inactivation of active species such as N * before reaching the central part of the wafer increases, and the film modification effect in the central part of the wafer becomes insufficient. In addition, the thickness of the SiN film of the evaluation sample 4 became thicker at the center of the wafer because of active species such as N * and N 2 * generated when N 2 gas was plasma-excited under pressure condition 4, especially. , N * , etc. are considered to be caused by a high rate of deactivation before reaching the central part of the wafer, and the effect of film densification in the central part of the wafer is insufficient.
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Abstract
Description
(a)処理容器内の基板に対して原料ガスを供給する工程と、
(b)前記処理容器内の前記基板に対して窒素及び水素含有ガスをプラズマ状態に励起させて供給する工程と、
(c)前記処理容器内の前記基板に対して不活性ガスをプラズマ状態に励起させて供給する工程と、
を含むサイクルを所定回数行うことで、前記基板上に膜を形成する工程を有し、
(c)における前記処理容器内の圧力を、(b)における前記処理容器内の圧力よりも低くする技術が提供される。
以下、本開示の一態様について、主に、図1~図5、図7(a)~図7(c)を参照しつつ説明する。なお、以下の説明において用いられる図面は、いずれも模式的なものであり、図面に示される、各要素の寸法の関係、各要素の比率等は、現実のものとは必ずしも一致していない。また、複数の図面の相互間においても、各要素の寸法の関係、各要素の比率等は必ずしも一致していない。
図1に示すように、処理炉202は温度調整器(加熱部)としてのヒータ207を有する。ヒータ207は円筒形状であり、保持板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(熱励起部)としても機能する。
上述の基板処理装置を用い、半導体装置の製造工程の一工程として、基板としてのウエハ200上に薄膜として絶縁膜である窒化膜を形成する処理シーケンス、すなわち、成膜シーケンスの例について説明する。以下の説明において、基板処理装置を構成する各部の動作はコントローラ121により制御される。
(a)処理容器内のウエハ200に対して原料ガスを供給する工程と、
(b)処理容器内のウエハ200に対してN及びH含有ガスをプラズマ状態に励起させて供給する工程と、
(c)処理容器内のウエハ200に対して不活性ガスをプラズマ状態に励起させて供給する工程と、
を含むサイクル、具体的には、これら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上に膜を形成する工程を有し、
(c)における処理容器内の圧力を、(b)における処理容器内の圧力よりも低くする。
(原料ガス→P→プラズマ励起N及びH含有ガス→P→プラズマ励起不活性ガス)×n
(原料ガス→P→プラズマ励起N及びH含有ガス→プラズマ励起不活性ガス→P)×n
(原料ガス→P→プラズマ励起N及びH含有ガス→P→プラズマ励起不活性ガス→P)×n
複数枚のウエハ200がボート217に装填(ウエハチャージ)される。その後、シャッタ開閉機構115sによりシャッタ219sが移動させられて、マニホールド209の下端開口が開放される(シャッタオープン)。ウエハ200は、製品ウエハやダミーウエハを含む。
その後、図1に示すように、複数枚のウエハ200を支持したボート217は、ボートエレベータ115によって持ち上げられて処理室201内へ搬入(ボートロード)される。この状態で、シールキャップ219は、Oリング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。
ボートロードが終了した後、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244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。
その後、次のステップ1,2,3を順次実行する。
ステップ1では、処理室201内のウエハ200に対して原料ガスを供給する。
処理温度:250~550℃、好ましくは400~500℃
処理圧力:100~4000Pa、好ましくは100~1000Pa
原料ガス供給流量:0.1~3slm
原料ガス供給時間:1~100秒、好ましくは1~30秒
不活性ガス供給流量(ガス供給管毎):0~10slm
が例示される。
処理温度:250~550℃、好ましくは400~500℃
処理圧力:1~20Pa
不活性ガス供給流量(ガス供給管毎):0.05~20slm
不活性ガス供給時間:1~600秒、好ましくは1~40秒
が例示される。
ステップ1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Si含有層に対してN及びH含有ガスをプラズマ状態に励起させて供給する。
処理温度:250~550℃、好ましくは400~500℃
処理圧力:2~100Pa、好ましくは20~70Pa
N及びH含有ガス供給流量:0.1~10slm
N及びH含有ガス供給時間:10~600秒、好ましくは1~50秒
不活性ガス供給流量(ガス供給管毎):0~10slm
RF電力:100~1000W
RF周波数:13.56MHzまたは27MHz
が例示される。
ステップ2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SiN層に対して不活性ガスをプラズマ状態に励起させて供給する。
処理温度:250~550℃、好ましくは400~500℃
処理圧力:2~6Pa、好ましくは2.66~5.32Pa、より好ましくは3~4P
a
不活性ガス供給流量(ガス供給管毎):0.01~2slm
不活性ガス供給時間:1~600秒、好ましくは10~60秒
RF電力:100~1000W
RF周波数:13.56MHzまたは27MHz
が例示される。
上述のステップ1,2,3を非同時に、すなわち、同期させることなく行うサイクルを所定回数(n回、nは1以上の整数)行うことにより、ウエハ200の表面を下地として、この下地上に、所定の厚さの膜として、例えば、所定の厚さのシリコン窒化膜(SiN膜)を形成することができる。上述のサイクルは、複数回繰り返すことが好ましい。すなわち、1サイクルあたりに形成されるSiN層の厚さを所望の膜厚よりも薄くし、SiN層を積層することで形成されるSiN膜の厚さが所望の厚さになるまで、上述のサイクルを複数回繰り返すことが好ましい。なお、反応ガスとして、N,C及びH含有ガスを用いる場合、ステップ2において、例えば、シリコン炭窒化層(SiCN層)を形成することもでき、上述のサイクルを所定回数行うことで、ウエハ200の表面上に、膜として、例えば、シリコン炭窒化膜(SiCN膜)を形成することもできる。
ウエハ200上へ所望の厚さのSiN膜を形成する処理が完了した後、ノズル249a~249cのそれぞれからパージガスとして不活性ガスを処理室201内へ供給し、排気口231aより排気する。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の下端から反応管203の外部に搬出(ボートアンロード)される。ボートアンロードの後は、シャッタ219sが移動させられ、マニホールド209の下端開口がOリング220cを介してシャッタ219sによりシールされる(シャッタクローズ)。
ボートアンロード後、すなわち、シャッタクローズ後、処理済のウエハ200は、ボート217に支持された状態で、取り出し可能な所定の温度となるまで冷却される(ウエハ冷却)。
ウエハ冷却後、取り出し可能な所定の温度となるまで冷却された処理済のウエハ200は、ボート217より取り出される(ウエハディスチャージ)。
本態様によれば、以下に示す1つ又は複数の効果が得られる。
本態様における処理シーケンスは、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、任意に組み合わせることができる。特に説明がない限り、各変形例の各ステップにおける処理手順、処理条件は、上述の処理シーケンスの各ステップにおける処理手順、処理条件と同様とすることができる。
原料ガスとして、Si-N結合を含む原料ガスを用いることにより、原料ガスを、Siソースとして作用させるだけでなく、Nソースとしても作用させることができ、N及びH含有ガスの供給を省略することもできる。すなわち、成膜処理では、図6および以下に示す処理シーケンスにより、ウエハ200上にSiN膜を形成するようにしてもよい。
(a)処理容器内のウエハ200に対して原料ガスを供給する工程と、
(c)処理容器内のウエハ200に対して不活性ガスをプラズマ状態に励起させて供給する工程と、
を含むサイクル、具体的には、これらを非同時に行うサイクルを所定回数行うことで、ウエハ200上に膜を形成することとなる。なお、上述の処理シーケンスは、(a)と(c)とを非同時に行うサイクルを、それらの間に処理容器内をパージする工程を挟んで、所定回数行う例を示している。
上述のサイクルは、さらに、ウエハ200に対してO含有ガスを供給する工程を含んでいてもよい。この場合、ウエハ200上にシリコン酸窒化膜(SiON膜)を形成することが可能となる。その場合、ウエハ200に対して、O含有ガスをプラズマ状態に励起させることなく供給するようにしてもよく、O含有ガスをプラズマ状態に励起させて供給するようにしてもよい。すなわち、成膜処理では、以下に示す処理シーケンスにより、ウエハ200上にSiON膜を形成するようにしてもよい。なお、上述の態様と同様、プラズマ励起不活性ガスの供給前後のパージを省略することもできる。
(原料ガス→P→プラズマ励起N及びH含有ガス→P→O含有ガス→P→プラズマ励起不活性ガス→P)×n
(原料ガス→P→プラズマ励起N及びH含有ガス→P→プラズマ励起不活性ガス→P→O含有ガス→P)×n
(原料ガス→P→プラズマ励起O含有ガス→P→プラズマ励起N及びH含有ガス→P→プラズマ励起不活性ガス→P)×n
(原料ガス→P→プラズマ励起N及びH含有ガス→P→プラズマ励起O含有ガス→P→プラズマ励起不活性ガス→P)×n
(原料ガス→P→プラズマ励起N及びH含有ガス→P→プラズマ励起不活性ガス→P→プラズマ励起O含有ガス→P)×n
(原料ガス→P→プラズマ励起不活性ガス→P→O含有ガス→P)×n
(原料ガス→P→プラズマ励起O含有ガス→P→プラズマ励起不活性ガス→P)×n
(原料ガス→P→プラズマ励起不活性ガス→P→プラズマ励起O含有ガス→P)×n
以上、本開示の態様を具体的に説明した。しかしながら、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。
(ステップ2→ステップ3→ステップ1)×n
(ステップ3→ステップ1→ステップ2)×n
(ステップ3→ステップ1→ステップ2)×n→ステップ3
[(ステップ1→ステップ2)×m→ステップ3]×n
[ステップ1→(ステップ2→ステップ3)×m]×n
圧力条件2:0.02Torr(2.66Pa)
圧力条件3:0.04Torr(5.32Pa)
圧力条件4:0.06Torr(7.98Pa)
201 処理室
Claims (20)
- (a)処理容器内の基板に対して原料ガスを供給する工程と、
(b)前記処理容器内の前記基板に対して窒素及び水素含有ガスをプラズマ状態に励起させて供給する工程と、
(c)前記処理容器内の前記基板に対して不活性ガスをプラズマ状態に励起させて供給する工程と、
を含むサイクルを所定回数行うことで、前記基板上に膜を形成する工程を有し、
(c)における前記処理容器内の圧力を、(b)における前記処理容器内の圧力よりも低くする基板処理方法。 - (c)における前記処理容器内の圧力を、2Pa以上6Pa以下とする請求項1に記載の基板処理方法。
- (c)における前記処理容器内の圧力を、2.66Pa以上5.32Pa以下とする請求項1に記載の基板処理方法。
- (c)における前記処理容器内の圧力を、3Pa以上4Pa以下とする請求項1に記載の基板処理方法。
- (c)において前記不活性ガスをプラズマ状態に励起させて供給する時間を、(b)において前記窒素及び水素含有ガスをプラズマ状態に励起させて供給する時間よりも長くする請求項1~4のいずれか1項に記載の基板処理方法。
- (c)において前記不活性ガスをプラズマ状態に励起させて供給する時間を、(a)において前記原料ガスを供給する時間よりも長くする請求項1~5のいずれか1項に記載の基板処理方法。
- 前記不活性ガスは、窒素ガスおよび希ガスのうち少なくともいずれかを含む請求項1~6のいずれか1項に記載の基板処理方法。
- 前記不活性ガスは、N2ガスを含む請求項1~6のいずれか1項に記載の基板処理方法。
- 前記不活性ガスは、Arガスを含む請求項1~6のいずれか1項に記載の基板処理方法。
- 前記窒素及び水素含有ガスは、NH3ガス、N2H2ガス、N2H4ガス、N3H8ガスのうち少なくともいずれかを含む請求項1~9のいずれか1項に記載の基板処理方法。
- 前記原料ガスは、ハロシランガスを含む請求項1~10のいずれか1項に記載の基板処理方法。
- (c)では、前記処理容器の外部に設けられた電極に電力を印加することにより、前記処理容器の内部で前記不活性ガスをプラズマ状態に励起させる請求項1~11のいずれか1項に記載の基板処理方法。
- 前記基板上に膜を形成する工程を、前記処理容器内で複数枚の前記基板を支持具により支持した状態で行い、その際、複数枚の前記基板の間隔を、前記支持具により支持可能な最大枚数の基板を支持する場合における基板の間隔よりも大きくする請求項1~12のいずれか1項に記載の基板処理方法。
- 前記基板上に膜を形成する工程では、複数枚の前記基板の間隔を、前記支持具により支持可能な最大枚数の基板を支持する場合における基板の間隔の2倍以上とする請求項13に記載の基板処理方法。
- 前記基板上に膜を形成する工程を、前記処理容器内に複数枚の前記基板を配列させた状態で行い、その際、複数枚の前記基板の間隔を12mm以上60mm以下とする請求項1~14のいずれか1項に記載の基板処理方法。
- 前記基板上に膜を形成する工程を、前記処理容器内に複数枚の前記基板を配列させた状態で行い、その際、複数枚の前記基板の間隔を15mm以上60mm以下とする請求項1~14のいずれか1項に記載の基板処理方法。
- (c)では、前記基板の側方から、前記基板に対して、前記不活性ガスをプラズマ状態に励起させて供給する請求項1~15のいずれか1項に記載の基板処理方法。
- (a)処理容器内の基板に対して原料ガスを供給する工程と、
(b)前記処理容器内の前記基板に対して窒素及び水素含有ガスをプラズマ状態に励起させて供給する工程と、
(c)前記処理容器内の前記基板に対して不活性ガスをプラズマ状態に励起させて供給する工程と、
を含むサイクルを所定回数行うことで、前記基板上に膜を形成する工程を有し、
(c)における前記処理容器内の圧力を、(b)における前記処理容器内の圧力よりも低くする半導体装置の製造方法。 - 基板が処理される処理容器と、
前記処理容器内へ原料ガスを供給する原料ガス供給系と、
前記処理容器内へ窒素及び水素含有ガスを供給する窒素及び水素含有ガス供給系と、
前記処理容器内へ不活性ガスを供給する不活性ガス供給系と、
ガスをプラズマ状態に励起させるプラズマ励起部と、
前記処理容器内の圧力を調整する圧力調整部と、
(a)処理容器内の基板に対して前記原料ガスを供給する処理と、(b)前記処理容器内の前記基板に対して前記窒素及び水素含有ガスをプラズマ状態に励起させて供給する処理と、(c)前記処理容器内の前記基板に対して前記不活性ガスをプラズマ状態に励起させて供給する処理と、を含むサイクルを所定回数行うことで、前記基板上に膜を形成する処理を行わせ、(c)における前記処理容器内の圧力を、(b)における前記処理容器内の圧力よりも低くするように、前記原料ガス供給系、前記窒素及び水素含有ガス供給系、前記不活性ガス供給系、前記プラズマ励起部、および前記圧力調整部を制御することが可能なよう構成される制御部と、
を有する基板処理装置。 - (a)基板処理装置の処理容器内の基板に対して原料ガスを供給する手順と、
(b)前記処理容器内の前記基板に対して窒素及び水素含有ガスをプラズマ状態に励起させて供給する手順と、
(c)前記処理容器内の前記基板に対して不活性ガスをプラズマ状態に励起させて供給する手順と、
を含むサイクルを所定回数行うことで、前記基板上に膜を形成する手順と、
(c)における前記処理容器内の圧力を、(b)における前記処理容器内の圧力よりも低くする手順と、
をコンピュータによって前記基板処理装置に実行させるプログラム。
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