WO2020188801A1 - 半導体装置の製造方法、基板処理装置、およびプログラム - Google Patents
半導体装置の製造方法、基板処理装置、およびプログラム Download PDFInfo
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- WO2020188801A1 WO2020188801A1 PCT/JP2019/011772 JP2019011772W WO2020188801A1 WO 2020188801 A1 WO2020188801 A1 WO 2020188801A1 JP 2019011772 W JP2019011772 W JP 2019011772W WO 2020188801 A1 WO2020188801 A1 WO 2020188801A1
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- H10P14/6328—Deposition from the gas or vapour phase
- H10P14/6334—Deposition from the gas or vapour phase using decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
- H10P14/6339—Deposition from the gas or vapour phase using decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition deposition by cyclic CVD, e.g. ALD, ALE or pulsed CVD
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- H10P14/65—Formation of materials, e.g. in the shape of layers or pillars of insulating materials characterised by treatments performed before or after the formation of the materials
- H10P14/6502—Formation of materials, e.g. in the shape of layers or pillars of insulating materials characterised by treatments performed before or after the formation of the materials of treatments performed before formation of the materials
- H10P14/6512—Formation of materials, e.g. in the shape of layers or pillars of insulating materials characterised by treatments performed before or after the formation of the materials of treatments performed before formation of the materials by exposure to a gas or vapour
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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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- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/34—Nitrides
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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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- C23C16/00—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
- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45527—Atomic layer deposition [ALD] characterized by the ALD cycle, e.g. different flows or temperatures during half-reactions, unusual pulsing sequence, use of precursor mixtures or auxiliary reactants or activations
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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
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/46—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for heating the substrate
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- 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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- H10P14/6939—Inorganic materials composed of oxides, glassy oxides or oxide-based glasses the material containing at least one metal element, e.g. metal oxides, metal oxynitrides or metal oxycarbides characterised by the metal
- H10P14/69394—Inorganic materials composed of oxides, glassy oxides or oxide-based glasses the material containing at least one metal element, e.g. metal oxides, metal oxynitrides or metal oxycarbides characterised by the metal the material containing titanium, e.g. TiO2
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Definitions
- the present disclosure relates to a semiconductor device manufacturing method, a substrate processing device, and a program.
- a process of selectively growing and forming a film on the surface of a specific substrate among a plurality of types of substrates exposed on the surface of a substrate (hereinafter, this process is selectively grown or selected). (Also referred to as film formation) may be performed (see, for example, Patent Document 1).
- the purpose of the present disclosure is to provide a technique capable of simplifying the manufacturing process of a semiconductor device.
- A An adsorption inhibitor is supplied to a substrate on which the first base and the second base are exposed on the surface under the first temperature, and the surface of one of the first base and the second base is used. And the process of adsorbing to (B) A step of thermally annealing the substrate after adsorbing the adsorption inhibitor on the surface of the one substrate under a second temperature higher than the first temperature. (C) By supplying the film-forming gas to the substrate after the thermal annealing at a third temperature lower than the second temperature, one of the first substrate and the second substrate is used. The process of forming a film on the surface of the other substrate, which is different from The technology to do is provided.
- 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 view 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 in 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 view 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 diagram showing a processing sequence in selective growth of one aspect of the present disclosure.
- FIG. 5A is an enlarged cross-sectional view of the surface of the wafer 200 in which the base 200a containing a tungsten film, the base 200b containing a silicon nitride film, and the base 200c containing a silicon oxide film are exposed on the surface.
- FIG. 5B is an enlarged cross-sectional view of the surface of the wafer 200 after the adsorption inhibitor is selectively adsorbed on the surfaces of the substrates 200b and 200c under the first temperature.
- FIG. 5A is an enlarged cross-sectional view of the surface of the wafer 200 in which the base 200a containing a tungsten film, the base 200b containing a silicon nitride film, and the base 200c containing a silicon oxide film are exposed on the surface.
- FIG. 5B is an enlarged cross-sectional view of the surface of the wafer 200 after the adsorption inhibitor is selectively ads
- FIG. 5C is an enlarged cross-sectional portion of the surface of the wafer 200 after the wafer 200 having the adsorption inhibitor adsorbed on the surfaces of the substrates 200b and 200c is thermally annealed under the second temperature higher than the first temperature.
- FIG. 5D is an enlarged cross-sectional portion of the surface of the wafer 200 after the titanium nitride film is selectively formed on the surface of the base 200a at a third temperature lower than the second temperature.
- 6 (a) to 6 (d) are diagrams showing the measurement results of the thickness of the titanium nitride film formed on the surfaces of the first to third substrates exposed on the surface of the wafer, respectively.
- the processing furnace 202 has a heater 207 as a heating mechanism (temperature adjusting 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 (excitation 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 with the upper end closed and the lower end 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 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.
- nozzles 249a to 249c as first to third supply units are provided 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 this 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 form an annular space in a plan view between the inner wall of the reaction tube 203 and the wafer 200, along the upper part of the inner wall of the reaction tube 203 from the lower part of the wafer 200.
- Each is provided so as to stand upward in the arrangement direction. That is, the nozzles 249a to 249c are provided along the wafer arrangement region in the region horizontally surrounding the wafer arrangement region on the side of the wafer arrangement region in which the wafer 200 is arranged.
- the nozzle 249b is arranged so as to face the exhaust port 231a described later with the center of the wafer 200 carried into the processing chamber 201 in a straight line.
- 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 (outer peripheral portion of the wafer 200) of the reaction tube 203 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 side opposite to the nozzle 249a with the straight line L interposed therebetween.
- the nozzles 249a and 249c are arranged line-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.
- a gas containing titanium (Ti) as a main element forming a film formed on the wafer 200 and a halogen element, that is, a halogenated titanium gas is MFC241a and a valve 243a.
- the halogenated titanium gas acts as a film forming gas, that is, a Ti source (raw material gas, precursor).
- Halogen elements include chlorine (Cl), fluorine (F), bromine (Br), iodine (I) and the like.
- halogenated titanium gas for example, tetrachlorotitanium (TiCl 4 ) gas, which is a titanium chloride gas, can be used.
- an organic adsorption inhibitor such as an organic silane compound is supplied into the processing chamber 201 via the MFC 241b, the valve 243b, and the nozzle 249b.
- an organic adsorption inhibitor for example, dimethylaminotrimethylsilane ((CH 3 ) 2 NSi (CH 3 ) 3 , abbreviation: DMATMS) gas, which is an aminosilane compound, can be used.
- a hydrogen nitride-based gas which is a nitrogen (N) -containing gas, is supplied into the processing chamber 201 as a reaction gas via the MFC 241c, the valve 243c, and the nozzle 249c.
- the hydrogen nitride-based gas acts as a film-forming gas, that is, an N source (nitriding gas, nitriding agent).
- an N source nitriding gas, nitriding agent
- As the hydrogen nitride-based gas for example, ammonia (NH 3 ) gas can be used.
- nitrogen (N 2 ) gas is introduced as an inert gas via MFC241d to 241f, valves 243d to 243f, gas supply pipes 232a to 232c, and nozzles 249a to 249c, respectively. It is supplied into 201.
- the N 2 gas acts as a purge gas, a carrier gas, a diluting gas, and the like.
- the gas supply pipes 232a, 232c, MFC241a, 241c, and valves 243a, 243c constitute a film-forming gas supply system (raw material gas supply system, reaction gas supply system).
- the adsorption inhibitor supply system is mainly composed of the gas supply pipe 232b, the MFC 241b, and the valve 243b.
- the inert gas supply system is mainly composed of gas supply pipes 232d to 232f, MFC241d to 241f, and valves 243d to 243f.
- any or all of the supply systems may be configured as an integrated supply system 248 in which valves 243a to 243f, MFC241a to 241f, and the like are integrated.
- the integrated 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 adjustment operation and the like are configured to be controlled by the controller 121 described later.
- the integrated supply system 248 is configured as an integrated or divided integrated unit, and can be attached to and detached from the gas supply pipes 232a to 232f in units of the integrated unit. It is configured so that maintenance, replacement, expansion, etc. can be performed on an integrated unit basis.
- 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, that is, along the wafer arrangement region.
- An exhaust pipe 231 is connected to the exhaust port 231a.
- the exhaust pipe 231 is provided via a pressure sensor 245 as a pressure detector (pressure detector) 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 exhaust system is mainly composed of the exhaust pipe 231 and the APC valve 244 and the 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 below the seal cap 219.
- the rotating shaft 255 of the rotating mechanism 267 penetrates the seal cap 219 and is connected to the boat 217.
- the rotation mechanism 267 is configured to rotate the wafer 200 by rotating the boat 217.
- the seal cap 219 is configured to be vertically lifted and lowered by a boat elevator 115 as a lifting mechanism installed outside the reaction tube 203.
- the boat elevator 115 is configured as a transport device (transport mechanism) for loading and unloading (conveying) 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 capable of airtightly closing 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 (elevating operation, rotating operation, etc.) of the shutter 219s is controlled by the shutter opening / closing mechanism 115s.
- the boat 217 as a substrate support supports a plurality of wafers, for example 25 to 200 wafers 200, in a horizontal position and vertically aligned with each other, that is, in a multi-stage manner. It is configured to be arranged at intervals.
- 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.
- a temperature sensor 263 as a temperature detector is installed in the reaction tube 203. By adjusting the degree of energization of 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.
- the controller 121 which is a control unit (control means), is configured as a computer including a CPU (Central Processing Unit) 121a, a RAM (Random Access Memory) 121b, a storage device 121c, and an I / O port 121d.
- the RAM 121b, the storage device 121c, and the I / O port 121d are configured so that data can be exchanged with the CPU 121a via the internal bus 121e.
- An input / output device 122 configured as, for example, a touch panel is connected to the controller 121.
- the storage device 121c is composed of, for example, a flash memory, an HDD (Hard Disk Drive), or the like.
- a control program for controlling the operation of the substrate processing device, a process recipe in which the procedures and conditions for substrate processing described later are described, and the like are readablely stored.
- the process recipes are combined so that the controller 121 can execute each procedure in the substrate processing described later and obtain a predetermined result, 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 term program is used in the present specification, it may include only a recipe alone, a control program alone, or both of them.
- the RAM 121b is configured as a memory area (work area) in which programs, data, and the like read by the CPU 121a are temporarily held.
- the I / O port 121d includes the above-mentioned MFCs 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, etc. It is connected to the.
- the CPU 121a is configured to read and execute a control program from the storage device 121c and read a recipe from the storage device 121c in response to an input of an operation command from the input / output device 122 or the like.
- the CPU 121a adjusts the flow rate of various gases by the 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 on the computer.
- the external storage device 123 includes, for example, a magnetic disk such as an HDD, an optical disk such as a CD, a magneto-optical disk such as MO, a semiconductor memory such as a USB memory, 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.
- Substrate processing step Using the above-mentioned substrate processing apparatus, as one step of the manufacturing process of the semiconductor device, selectively on the surface of a specific substrate among a plurality of types of substrates exposed on the surface of the wafer 200 as a substrate.
- An example of a process sequence of selective growth (selective film formation) formed by growing a film will be described mainly with reference to FIGS. 4, 5 (a) to 5 (d).
- the operation of each part constituting the substrate processing apparatus is controlled by the controller 121.
- Step A in which DMATMS gas is supplied as an adsorption inhibitor and is adsorbed on the surface of one of the substrate 200a and the substrate 200b (here, the substrate 200b).
- Step B of thermally annealing the wafer 200 after adsorbing DMATMS on the surface of the base 200b under a second temperature higher than the first temperature By supplying TiCl 4 gas and NH 3 gas as film forming gases to the wafer 200 after thermal annealing at a third temperature lower than the second temperature, one of the above-mentioned bases 200a and 200b is used.
- TiN film titanium nitride film
- FIG. 4 shows a predetermined number of cycles (n) in step C in which the step C1 for supplying the TiCl 4 gas to the wafer 200 and the step C2 for supplying the NH 3 gas to the wafer 200 are performed non-simultaneously.
- Time, n is an integer of 1 or more).
- a third base (base 200c) including a silicon oxide film (SiO film) is further exposed on the surface of the wafer 200.
- step A the DMATMS is also adsorbed on the surface of the base 200c
- step B the wafer 200 having DMATMS adsorbed on the surfaces of the bases 200b and 200c is thermally annealed
- step C the bases 200b and 200c are respectively adsorbed.
- the TiN film is selectively formed on the surface of the base 200a without forming the TiN film on the surface is shown.
- the film formation sequence shown in FIG. 4 may be shown as follows for convenience. The same notation is used in the following description of modified examples and the like.
- wafer When the word “wafer” is used in the present specification, it may mean the wafer itself or a laminate of a wafer and a predetermined layer or film formed on the surface thereof.
- wafer surface When the term “wafer surface” is used in the present specification, it may mean the surface of the wafer itself or the surface of a predetermined layer or the like formed on the wafer.
- a predetermined layer when it is described that "a predetermined layer is formed on a wafer”, it means that a predetermined layer is directly formed on the surface of the wafer itself, or a layer formed on the wafer or the like. It may mean forming a predetermined layer on top of it.
- board in the present specification is also synonymous with the use of the term "wafer”.
- the shutter opening / closing mechanism 115s moves the shutter 219s to open the lower end opening of the manifold 209 (shutter open).
- 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.
- a W film as a transition metal-containing film which is an O-free metal element-containing film (non-oxidizing film).
- the base 200c including the SiO film as the film is in a pre-exposed state.
- the surface of the wafer 200 is previously subjected to a cleaning treatment using an aqueous hydrogen fluoride (HF) solution to remove the natural oxide film formed on the surface of each substrate exposed on the surface of the wafer 200. It is in a state of being.
- the base 200c has a hydroxyl group (OH) -terminated surface over the entire area (entire surface).
- the bases 200a and 200b have a surface in which many regions are not OH-terminated, that is, a surface in which some regions are OH-terminated.
- the OH termination rate on the surface of the base 200a tends to be smaller than the OH termination rate on the surface of the base 200b.
- the W film constituting the base 200a is a film having conductivity
- the SiN film forming the base 200b and the SiO film forming the base 200c are each non-conductive film, that is, a film having insulation property. Is.
- Vacuum exhaust (vacuum exhaust) is performed by the vacuum pump 246 so that the pressure (vacuum degree) in the processing chamber 201, that is, the space where the wafer 200 exists, becomes a desired pressure.
- the pressure in the processing chamber 201 is measured by the pressure sensor 245, and the APC valve 244 is feedback-controlled based on the measured pressure information.
- the wafer 200 in the processing chamber 201 is heated by the heater 207 so as to have a desired processing temperature.
- the state of energization of the heater 207 is feedback-controlled based on the temperature information detected by the temperature sensor 263 so that the inside of the processing chamber 201 has a desired temperature distribution.
- the rotation mechanism 267 starts the rotation of the wafer 200. Exhaust in the processing chamber 201, heating and rotation of the wafer 200 are all continuously performed at least until the processing of the wafer 200 is completed.
- Step A DMATMS gas is supplied to the wafer 200 in the processing chamber 201, that is, the wafer 200 in which the bases 200a to 200c are exposed on the surface, respectively, under the first temperature.
- valve 243b is opened to allow DMATMS gas to flow into the gas supply pipe 232b.
- the flow rate of the DMATMS 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.
- DMATMS gas is supplied to the wafer 200 (DMATMS gas supply).
- the valves 243d and 243f are opened, and N 2 gas is supplied into the processing chamber 201 via the nozzles 249a and 249c, respectively.
- the supply of N 2 gas may not be implemented.
- the processing conditions in this step are DMATMS gas supply flow rate: 50 to 1000 sccm, preferably 50 to 500 sccm
- DMATMS gas supply time 1 to 60 minutes, preferably 10 to 30 minutes
- Processing temperature (first temperature) 50 to 300 ° C, preferably 80 to 200 ° C
- Processing pressure 10 to 1000 Pa, preferably 100 to 500 Pa Is exemplified.
- the conditions described here are conditions in which the DMATMS gas does not undergo vapor phase decomposition (thermal decomposition) in the processing chamber 201.
- the DMATMS is suppressed on the surface of the base 200a while suppressing the adsorption of the DMATMS on the surfaces of the bases 200b and 200c. Can be selectively (preferentially) adsorbed. At this time, DMATMS may be adsorbed on a part of the surface of the base 200a, but the amount of adsorption is small, and the amount of DMATMS adsorbed on the surfaces of the bases 200b and 200c is overwhelmingly large.
- the amount of DMATMS adsorbed on the surfaces of the bases 200b and 200c tends to be larger than the amount of DMATMS adsorbed on the surface of the base 200b.
- the treatment conditions in this step are conditions in which the DMATMS gas does not undergo vapor phase decomposition in the treatment chamber 201.
- the surface of the base 200c is OH-terminated over the entire area, many regions of the surfaces of the bases 200a and 200b are not OH-terminated (a part of the surface is OH-terminated). is there.
- the OH termination rate on the surface of the base 200a tends to be smaller than the OH termination rate on the surface of the base 200b.
- the W film constituting the base 200a is a film having conductivity
- each of the SiN film forming the base 200b and the SiO film forming the base 200c does not have conductivity (insulation property). This is because it is a film having.
- DMATMS may be physically adsorbed on the surface of the base 200a very slightly, this adsorption state is extremely unstable physical adsorption unlike the physical adsorption on the surface of the base 200b described later. It becomes.
- DMATMS is not adsorbed at all, or even if it is adsorbed, the amount of adsorption is very small, and the adsorption becomes a temporary phenomenon that is released in a very short time. ..
- the adsorption state of DMATMS on the surface of the base 200a becomes extremely unstable because the W film constituting the base 200a has conductivity, so that the adsorption state of DMATMS on the surface of the base 200a becomes physical adsorption without charging. It is presumed that this is the case.
- DMATMS is mainly physically adsorbed on the surface of the base 200b.
- This adsorption state is a stable physical adsorption as compared with the physical adsorption of DMATMS on the surface of the base 200a.
- the adsorption state of DMATMS on the surface of the substrate 200b is more stable than the adsorption state of DMATMS on the surface of the substrate 200a because the SiN film constituting the substrate 200b does not have conductivity (has insulating property). Therefore, it is presumed that the adsorption state of DMATMS on the surface of the base 200b becomes physical adsorption accompanied by weak charging.
- step A that is, before the implementation of step B described later, the adsorption state of DMATMS on the surface of the base 200b is unstable as compared with the chemisorption of DMATMS on the surface of the base 200c described later.
- Adsorption DMATMS is mainly physically adsorbed on the surface of the base 200b, but DMATMS may be partially chemically adsorbed. However, even in that case, the amount of chemisorption is much smaller than the amount of chemisorption of DMATMS on the surface of the base 200c described later.
- DMATMS is mainly chemisorbed on the surface of the base 200c.
- the OH termination formed on the entire surface of the base 200c reacts with DMATMS, and as a result, Si contained in DMATMS is chemisorbed on the surface of the base 200c.
- the adsorption state of DMATMS on the surface of the base 200c is more stable than the physical adsorption of DMATMS on the surface of the base 200b described above.
- Si contained in DMATMS is chemically adsorbed on the surface of the base 200c, most of the ligand bound to Si contained in DMATMS is maintained, but a part of the ligand is eliminated.
- DMATMS in which a part of the ligand is eliminated during chemisorption is also referred to as DMATMS for convenience.
- the first temperature is less than 50 ° C.
- DMATMS is less likely to be adsorbed not only on the surface of the base 200a but also on the surfaces of the bases 200b and 200c.
- the first temperature is set to a temperature of 50 ° C. or higher
- DMATMS can be adsorbed on the surfaces of the substrates 200b and 200c.
- the first temperature is set to a temperature of 80 ° C. or higher, it is possible to promote the adsorption of DMATMS on the surfaces of the substrates 200b and 200c.
- the thermal energy given to the reaction system exceeds the activation energy for chemically adsorbing DMATMS on the surface, and not only the surfaces of the substrates 200b and 200c but also the surface of the substrate 200a. DMATMS may also be adsorbed on the top. Further, when the first temperature exceeds 300 ° C., DMATMS may undergo vapor phase decomposition, and the constituent components and constituent elements (Si, amino group and methyl group) of DMATMS are placed on the respective surfaces of the substrates 200a, 200b and 200c. And the elements such as N, C, and H that compose them) may be deposited multiple times. By setting the first temperature to a temperature of 300 ° C.
- adsorption of DMATMS on the surface of the substrate 200a and multiple deposition of components and elements of DMATMS are suppressed, and DMATMS is selected on the surfaces of the substrates 200b and 200c. It is possible to properly perform the target adsorption.
- the first temperature to 200 ° C. or lower, adsorption of DMATMS on the surface of the base 200a and multiple deposition of components and elements of DMATMS are surely suppressed, and DMATMS on the surfaces of the bases 200b and 200c. It becomes possible to more appropriately perform selective adsorption of.
- the adsorption of DMATMS on the surfaces of the substrates 200b and 200c is saturated. That is, self-limitation is applied to the adsorption of DMATMS on the surfaces of the substrates 200b and 200c.
- the amount of DMATMS adsorbed on the surfaces of the bases 200b and 200c becomes a substantially uniform amount over the entire surface of the bases 200b and 200c.
- the valve 243a is closed to stop the supply of DMATMS into the processing chamber 201. Then, the gas or the like remaining in the processing chamber 201 is removed from the processing chamber 201. At this time, by opening the valve 243 d ⁇ 243 f, and supplies N 2 gas through the nozzle 249a ⁇ 249 c into the process chamber 201.
- the N 2 gas supplied from the nozzles 249a to 249c acts as a purge gas, whereby the inside of the processing chamber 201 is purged (purge).
- an aminosilane compound represented by the following general formula [1] can be used.
- A represents an alkyl group such as a hydrogen atom, a methyl group, an ethyl group, a propyl group or a butyl group, or an alkoxy group such as a methoxy group, an ethoxy group, a propoxy group or a butoxy group.
- the alkyl group may be not only a linear alkyl group but also a branched alkyl group such as an isopropyl group, an isobutyl group, a secondary butyl group and a tertiary butyl group.
- the alkoxy group may be not only a linear alkoxy group but also a branched alkoxy group such as an isopropoxy group or an isobutoxy group.
- B represents a hydrogen atom or an alkyl group such as a methyl group, an ethyl group, a propyl group or a butyl group.
- the alkyl group may be not only a linear alkyl group but also a branched alkyl group such as an isopropyl group, an isobutyl group, a secondary butyl group and a tertiary butyl group.
- the plurality of A's may be the same or different, and the two B's may be the same or different.
- x is an integer of 1 to 3.
- the inert gas in addition to the N 2 gas, a rare gas such as Ar gas, He gas, Ne gas, and Xe gas can be used. This point is the same in each step described later.
- Step B the output of the heater 207 is adjusted so that the wafer 200 after adsorbing DMATMS on the surfaces of the bases 200b and 200c is thermally annealed under a second temperature higher than the first temperature.
- This step may be performed with the valves 243d to 243f opened and the N 2 gas supplied into the processing chamber 201, or the valves 243d to 243f are closed and the supply of the N 2 gas to the processing chamber 201 is stopped. You may go in this state.
- the processing conditions in this step are N 2 gas supply flow rate (for each gas supply pipe): 0 to 1000 sccm, preferably 50 to 500 sccm Processing temperature (second temperature): 400 to 600 ° C, preferably 450 to 550 ° C Processing pressure: 1 to 1000 Pa, preferably 100 to 500 Pa Processing time: 1 minute to 12 hours, preferably 1 to 5 hours is exemplified.
- the wafer 200 By thermally annealing the wafer 200 under the above-mentioned conditions, it is possible to shift (change) the adsorption state of DMATMS physically adsorbed on the surface of the base 200b from physical adsorption to chemisorption. As a result, as shown in FIG. 5C, the adsorption state of DMATMS on the surface of the substrate 200b is changed to a more stable adsorption state than the adsorption state of DMATMS on the surface of the substrate 200b in step A. Is possible. In this way, the surface of the base 200b is modified by performing steps A and B, that is, through a two-step treatment.
- DMATMS is partially chemically adsorbed on the surface of the base 200b, even if this step is performed, the adsorption state of the chemically adsorbed component remains chemically adsorbed, that is, a stable adsorption state. Will be maintained. Further, even if this step is performed, the adsorption state of DMATMS on the surface of the base 200c is maintained as chemisorption, that is, as a stable adsorption state. That is, the modification of the surface of the base 200c is almost completed by performing step A, that is, by one-step treatment. Further, even if this step is performed, the surface of the base 200a is maintained in a state where DMATMS is not adsorbed, that is, without being modified.
- the second temperature is less than 400 ° C.
- the surface of the base 200b is not sufficiently modified, and DMATMS may be desorbed from the surface of the base 200b in step C described later.
- the second temperature By setting the second temperature to a temperature of 400 ° C. or higher, it becomes possible to sufficiently modify the surface of the base 200b, and in step C described later, desorption of DMATMS from the surface of the base 200b is suppressed. Is possible.
- the second temperature By setting the second temperature to 450 ° C. or higher, the surface of the base 200b can be reliably modified, and the desorption of DMATMS from the surface of the base 200b in step C can be reliably suppressed. It becomes.
- the second temperature exceeds 600 ° C.
- DMATMS adsorbed on the surfaces of the substrates 200b and 200c may be decomposed, and most of the ligands bound to Si contained in DMATMS may be eliminated. If most of the ligands bound to Si contained in DMATMS are eliminated, the effect of inhibiting film formation on the surfaces of the substrates 200b and 200c may not be obtained in step C described later.
- the second temperature By setting the second temperature to 600 ° C. or lower, it becomes possible to suppress the desorption of the ligand due to the decomposition of DMATMS adsorbed on the surfaces of the substrates 200b and 200c.
- the second temperature By setting the second temperature to 550 ° C. or lower, it is possible to reliably suppress the desorption of the ligand due to the decomposition of DMATMS adsorbed on the surfaces of the substrates 200b and 200c.
- the output of the heater 207 is adjusted to lower the temperature in the processing chamber 201 to a third temperature lower than the second temperature. At this time, the gas or the like remaining in the processing chamber 201 is removed from the processing chamber 201 (purge) by the same processing procedure as in the purging in step A.
- steps C1 and C2 are sequentially executed.
- Step C1 TiCl 4 gas is supplied to the wafer 200 in the processing chamber 201, that is, the wafer 200 after thermal annealing.
- valve 243a is opened to allow TiCl 4 gas to flow into the gas supply pipe 232a.
- the flow rate of the TiCl 4 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.
- TiCl 4 gas is supplied to the wafer 200 (TiCl 4 gas supply).
- the valves 243e and 243f may be opened to supply the N 2 gas into the processing chamber 201 via the nozzles 249b and 249c, respectively.
- the processing conditions in this step are TiCl 4 gas supply flow rate: 1 to 1000 sccm, preferably 10 to 500 sccm TiCl 4 gas supply time: 1 to 60 seconds, preferably 2 to 10 seconds Treatment temperature (third temperature): 50 to 250 ° C, preferably 150 to 200 ° C. Processing pressure: 1 to 500 Pa, preferably 10 to 100 Pa Is exemplified. Other processing conditions are the same as the processing conditions in step A.
- Ti-containing layer containing Cl is formed on the surface of the base 200a in which the DMATMS is not adsorbed among the bases 200a to 200c.
- Ti-containing layer containing Cl is on the surface of the base 200a, chemisorption and physisorption TiCl 4, chemical adsorption of the substance portion of TiCl 4 was decomposed (TiCl x), deposition of Ti by thermal decomposition of TiCl 4 And so on.
- the Ti-containing layer containing Cl may be an adsorption layer of TiCl 4 or TiCl x (physisorption layer or chemisorption layer), or may be a Ti deposition layer containing Cl. In the present specification, the Ti-containing layer containing Cl is also simply referred to as a Ti-containing layer.
- this step it is possible to selectively form the Ti-containing layer on the surface of the base 200a while suppressing the formation of the Ti-containing layer on the surfaces of the bases 200b and 200c.
- a very slight Ti-containing layer may be formed on the surfaces of the bases 200b and 200c.
- the thickness of the Ti-containing layer formed on the surfaces of the bases 200b and 200c is much thinner than the thickness of the Ti-containing layer formed on the surface of the bases 200a. ..
- Such selective formation of the Ti-containing layer is possible because DMATMS existing on the surfaces of the bases 200b and 200c can form the Ti-containing layer (adsorption of Ti) on the surface of the bases 200b and 200c. This is because it acts as an inhibitory factor, that is, an inhibitor.
- the above-mentioned action of DMATMS makes it possible to prolong the time until the film formation reaction occurs, that is, the incubation time, and as a result, the substrates 200a to be exposed on the surface of the wafer 200.
- the Ti-containing layer can be selectively formed on the surface of the base 200a.
- the DMATMS chemically adsorbed on the surfaces of the substrates 200b and 200c is stably maintained without being desorbed even when this step is performed.
- the raw material gas film forming gas
- other chloro titanium-based gas such as TiCl 4 gas, tetrabromobisphenol titanium (TiBr 4) and bromo titanium-based gas such as a gas, tetra-iodo titanium (TiI 4) iodine, such as gas Titanium-based gas
- TiCl 4 gas tetrabromobisphenol titanium
- TiBr 4 tetrabromobisphenol titanium
- bromo titanium-based gas such as a gas
- TiI 4 iodine such as gas Titanium-based gas
- Step C2 In this step, the wafer 200 in the process chamber 201, i.e., supplying the NH 3 gas to the Ti-containing layer formed on the base 200a.
- valve 243 c By opening the valve 243 c, flow the NH 3 gas into the gas supply pipe 232c.
- the flow rate of the NH 3 gas is adjusted by the MFC 241c, is supplied into the processing chamber 201 via the nozzle 249c, and is exhausted from the exhaust port 231a.
- NH 3 gas is supplied to the wafer 200 (NH 3 gas supply).
- the valves 243d and 243e may be opened to supply the N 2 gas into the processing chamber 201 via the nozzles 249a and 249b, respectively.
- the processing conditions in this step are NH 3 gas supply flow rate: 100-2000 sccm, 500-1000 sccm NH 3 gas supply time: 10 to 200 seconds, preferably 20 to 120 seconds Processing pressure: 1 to 1000 Pa, preferably 50 to 500 Pa Is exemplified. Other processing conditions are the same as the processing conditions in step C1.
- Ti-containing layer formed on the surface of the base 200a is nitrided (reforming).
- a layer containing Ti and N that is, a titanium nitride layer (TiN layer) is formed on the surface of the base 200a.
- impurities such as Cl contained in the Ti-containing layer in the course of the reforming reaction of the Ti-containing layer according to the NH 3 gas, constitutes a gaseous material containing at least Cl, the process chamber 201 It is discharged from inside.
- the TiN layer becomes a layer having less impurities such as Cl than the Ti-containing layer formed in step C1.
- the DMATMS existing on the surfaces of the bases 200b and 200c is maintained without being detached even when this step is performed. That is, the surfaces of the bases 200b and 200c are stably maintained in a state in which DMATMS is adsorbed without being modified (NH-terminated).
- reaction gas in addition to NH 3 gas, for example, hydrogen nitride-based gas such as diimide (N 2 H 2 ) gas, hydrazine (N 2 H 4 ) gas, and N 3 H 8 gas should be used. Can be done.
- hydrogen nitride-based gas such as diimide (N 2 H 2 ) gas, hydrazine (N 2 H 4 ) gas, and N 3 H 8 gas should be used. Can be done.
- the surface of the wafer 200 is formed by performing the above-mentioned steps C1 and C2 non-simultaneously, that is, by performing a predetermined number of cycles (n times, n is an integer of 1 or more) without synchronization.
- a TiN film can be selectively formed on the surface of the base 200a out of the bases 200a to 200c exposed to the surface.
- the above cycle is preferably repeated a plurality of times. That is, the above-mentioned cycle is performed until the thickness of the TiN layer formed per cycle is made thinner than the desired film thickness and the film thickness formed by laminating the TiN layers reaches the desired film thickness. Is preferably repeated a plurality of times.
- the DMATMS adsorbed on the surfaces of the bases 200b and 200c is maintained without being detached, so that no TiN film is formed on the surfaces of the bases 200b and 200c. ..
- a very slight TiN film may be formed on the surfaces of the bases 200b and 200c.
- the thickness of the TiN film formed on the surfaces of the bases 200b and 200c is much thinner than the thickness of the TiN film formed on the surface of the bases 200a.
- 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 carried out of the reaction tube 203 and then taken out from the boat 217 (wafer discharge).
- steps A to C By performing steps A to C, it is possible to selectively form a TiN film on the surface of the base 200a among the bases 200a to 200c exposed on the surface of the wafer 200. This makes it possible to simplify those steps, such as omitting the patterning process including photolithography when manufacturing a semiconductor device, for example. As a result, it becomes possible to improve the productivity of the semiconductor device and reduce the manufacturing cost.
- step A DMATMS is adsorbed on the surfaces of the bases 200b and 200c, and the adsorption state of DMATMS on the surface of the bases 200c can be made stable chemisorption. Further, by performing step B after performing step A, it is possible to shift the adsorption state of DMATMS on the surface of the base 200b from an unstable physical adsorption state to a stable chemical adsorption state. As a result, according to this aspect, the formation of the TiN film on the surfaces of the two types of substrates (bases 200b and 200c) can be suppressed by using one type of adsorption inhibitor. As a result, it becomes possible to simplify the manufacturing process of the semiconductor device, improve the productivity, and reduce the manufacturing cost.
- step A the amount of DMATMS selectively adsorbed on the bases 200b and 200c can be made substantially uniform over the entire surface of the bases 200b and 200c.
- step C it is possible to substantially and reliably inhibit the formation of the TiN film on the substrates 200b and 200c over the entire surface thereof. That is, it becomes possible to enhance the selectivity in selective growth.
- steps A to C Since at least one of steps A to C, preferably each of steps A to C, is performed in a non-plasma atmosphere, plasma damage to the wafer 200 can be avoided. It can also be applied to processes that are concerned about plasma damage.
- the metal element-containing film constituting the base 200a may be a conductive metal element-containing film such as a tungsten nitride film (WN film) or a titanium nitride film (TiN film) in addition to the W film.
- a conductive metal element-containing film such as a tungsten nitride film (WN film) or a titanium nitride film (TiN film) in addition to the W film.
- WN film tungsten nitride film
- TiN film titanium nitride film
- step C before starting the cycle in which steps C1 and C2 are performed non-simultaneously, DMATMS is selectively selected on the surface of the wafer 200 in the processing chamber 201, that is, the substrates 200b and 200c of the substrates 200a to 200c.
- the wafer 200 after being adsorbed on the wafer 200 may be subjected to a step of supplying NH 3 gas for a predetermined time (NH 3 preflow).
- NH 3 preflow a predetermined time
- the DMATMS existing on the surfaces of the bases 200b and 200c is stably maintained without being desorbed, so that the same effect as the above-described aspect can be obtained.
- the adsorption site on the surface of the base 200a can be optimized, and the quality of the film formed on the base 200a can be improved.
- an organic metal gas such as trimethylaluminum (Al (CH 3 ) 3 , abbreviation: TMA) gas, dichlorosilane ( SiH 2 Cl 2 , abbreviation: DCS) gas, tetrachlorosilane (SiCl 4 , abbreviation: 4CS) gas, hexachlorodisilane (Si 2 Cl 6 , abbreviation: HCDS) gas and other halosilane gases, trisdimethylaminosilane (Si [N] (CH 3) 2] 3 H , abbreviation: 3DMAS) may be used aminosilane-based gas such as a gas.
- TMA trimethylaluminum
- DCS dichlorosilane
- SiCl 4 tetrachlorosilane
- 4CS hexachlorodisilane
- HCDS hexachlorodisilane
- 3DMAS trisdimethylaminosilane
- reaction gas in addition to N-containing gas such as NH 3 gas, O-containing gas such as oxygen (O 2 ) gas and ozone (O 3 ) gas, triethylamine ((C 2 H 5 ) 3 N, abbreviation:
- N-containing gas such as NH 3 gas
- O-containing gas such as oxygen (O 2 ) gas and ozone (O 3 ) gas
- triethylamine ((C 2 H 5 ) 3 N triethylamine ((C 2 H 5 ) 3 N, abbreviation:
- An N and C-containing gas such as TEA) gas
- C-containing gas such as propylene (C 3 H 6 ) gas
- B boron -containing gas
- BCl 3 trichloroborane
- a titanium aluminum nitride film (TiAlN film), a titanium oxynitride film (TiON film), a titanium oxide film (TIO film), and SiN are placed on the surface of the base 200a among the bases 200a to 200c.
- Membrane, silicon oxynitride film (SiON film), silicon boronitride film (SiBN film), silicon borocarbon nitride film (SiBCN film), silicon carbon nitride film (SiCN film), silicon oxycarbonate film (SiOCN film), silicon A film such as an acid carbide film (SiOC film) or a SiO film may be formed. In these cases as well, the same effects as those described above can be obtained.
- the recipes used for each process are individually prepared according to the processing content and stored in the storage device 121c via a telecommunication line or an external storage device 123. Then, when starting each process, it is preferable that the CPU 121a appropriately selects an appropriate recipe from a plurality of recipes stored in the storage device 121c according to the processing content. This makes it possible to form films of various film types, composition ratios, film qualities, and film thicknesses with good reproducibility with one substrate processing apparatus. In addition, the burden on the operator can be reduced, and each process can be started quickly while avoiding operation mistakes.
- the above recipe is not limited to the case of newly creating, for example, it may be prepared by changing an existing recipe already installed in the board processing apparatus.
- the changed recipe may be installed on the substrate processing apparatus via a telecommunication line or a recording medium on which the recipe is recorded.
- the input / output device 122 included in the existing board processing device may be operated to directly change the existing recipe already installed in the board processing device.
- an example of forming a film using a batch type substrate processing apparatus that processes a plurality of substrates at one time has been described.
- the present disclosure is not limited to the above-described embodiment, and can be suitably applied to, for example, a case where a film is formed by using a single-wafer type substrate processing apparatus that processes one or several substrates at a time.
- an example of forming a film by using a substrate processing apparatus having a hot wall type processing furnace has been described.
- the present disclosure is not limited to the above-described embodiment, and can be suitably applied to the case where a film is formed by using a substrate processing apparatus having a cold wall type processing furnace.
- each processing can be performed under the same processing procedure and processing conditions as those in the above-described embodiment, and the same effects as those in the above-described embodiment can be obtained.
- the above aspects 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 procedure and processing conditions of the above-described aspect.
- step C was performed.
- the processing conditions in step C were predetermined conditions within the processing condition range described in the above aspect.
- step A in the above-described embodiment was carried out, step B was not carried out, and step C was carried out.
- the processing conditions in step A were predetermined conditions within the processing condition range described in the above aspect.
- the processing conditions in step C were the same as the processing conditions in step C when preparing the sample 1.
- steps A, B, and C in the above-described embodiment were performed, respectively.
- the processing conditions in step A were the same as the processing conditions in step A when preparing the sample 2.
- the processing conditions in step B were predetermined conditions within the processing condition range described in the above aspect.
- the processing conditions in step C were the same as the processing conditions in step C when preparing the sample 1.
- steps A, B, and C in the above-described embodiment were performed, respectively.
- the processing temperature (first temperature) in step A was set to a predetermined temperature within the range of 400 to 600 ° C., which was about the same as the processing temperature (second temperature) in step B.
- the other treatment conditions were the same as the treatment conditions for preparing the sample 3.
- the thickness of the TiN film formed on the surfaces of the first to third substrates of each of the samples 1 to 4 was measured.
- the results are shown in FIGS. 6 (a) to 6 (d).
- the vertical axis represents the film thickness (nm) of the TiN film formed on the surface of each substrate
- the horizontal axis represents the type of substrate (third substrate (SiO film) and second substrate (SiN in order from the left).
- the film) and the first substrate (W film)) are shown, respectively.
- the TiN film was properly formed on the surface of the first base film (W film). Although the formation of the TiN film on the surface of the third substrate (SiO film) can be suppressed, the TiN film having a certain thickness is formed on the surface of the second substrate (SiN film). It was confirmed that sufficient selectivity was not obtained for multiple types of substrates.
- the TiN film was properly formed on the surface of the first substrate (W film), and the second substrate was formed. It was confirmed that the formation of the TiN film on the surfaces of the (SiN film) and the third substrate (SiO film) was suppressed, and that sufficient selectivity was obtained for a plurality of types of substrates.
- the thickness of the TiN film formed on the surface of the second substrate (SiN film) is about 1 nm, and by reducing the number of cycles in step C, the TiN film is formed on the surface of the second substrate (SiN film). It can be seen that the thickness of the TiN film can be reduced to zero.
- both steps A and B are carried out, and at that time, the processing temperature (first temperature) of step A is the same as the processing temperature (second temperature) of step B.
- the treatment temperature of step A is set to the same temperature as the treatment temperature of step B, so that the heat energy given to the reaction system when step A is carried out is activated for chemisorption of DMATMS on the surface.
- DMATMS chemically adsorbs to all the surfaces of the first to third substrates without selectivity, or DMATMS undergoes vapor phase decomposition and is on all surfaces of the first to third substrates. It is presumed that the constituents and constituent elements of DMATMS (Si, amino groups, methyl groups, and elements such as N, C, and H constituting them) were accumulated in multiple layers.
- step A DMATMS is selectively adsorbed on the surfaces of the second base (SiN film) and the third base (SiO film), and DMATMS is adsorbed on the surface of the first base (W film).
- first temperature the processing temperature
- second temperature the processing temperature of step B
- step B the wafer is thermally annealed at a second temperature higher than the first temperature. It turns out that step B needs to be performed. Further, it can be seen that even if step B is performed under the second temperature higher than the first temperature, the stable adsorption state of DMATMS on the surface of the third substrate is maintained without change.
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Abstract
Description
(a)第1温度下で、第1下地と第2下地とが表面に露出した基板に対して、吸着抑制剤を供給し、前記第1下地および前記第2下地のうち一方の下地の表面に吸着させる工程と、
(b)前記第1温度よりも高い第2温度下で、前記一方の下地の表面に前記吸着抑制剤を吸着させた後の前記基板を熱アニールする工程と、
(c)前記第2温度よりも低い第3温度下で、前記熱アニール後の前記基板に対して成膜ガスを供給することで、前記第1下地および前記第2下地のうち前記一方の下地とは異なる他方の下地の表面上に膜を形成する工程と、
を行う技術が提供される。
以下、本開示の一態様について、主に、図1~図4を参照しながら説明する。
図1に示すように、処理炉202は加熱機構(温度調整部)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(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の表面に露出した複数種類の下地のうち特定の下地の表面上に選択的に膜を成長させて形成する選択成長(選択成膜)の処理シーケンス例について、主に、図4、図5(a)~図5(d)を用いて説明する。以下の説明において、基板処理装置を構成する各部の動作はコントローラ121により制御される。
第1温度下で、タングステン膜(W膜)を含む第1下地(下地200a)とシリコン窒化膜(SiN膜)を含む第2下地(下地200b)とが表面に露出したウエハ200に対して、吸着抑制剤としてDMATMSガスを供給し、下地200aおよび下地200bのうち一方の下地(ここでは下地200b)の表面に吸着させるステップAと、
第1温度よりも高い第2温度下で、下地200bの表面にDMATMSを吸着させた後のウエハ200を熱アニールするステップBと、
第2温度よりも低い第3温度下で、熱アニール後のウエハ200に対して成膜ガスとしてTiCl4ガスおよびNH3ガスを供給することにより、下地200aおよび下地200bのうち上述の一方の下地とは異なる他方の下地(ここでは下地200a)の表面上に、膜として、TiおよびNを含む膜であるチタン窒化膜(TiN膜)を形成するステップCと、を行う。
複数枚のウエハ200がボート217に装填(ウエハチャージ)されると、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)。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。
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。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。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A~Cを順次実行する。
このステップでは、第1温度下で、処理室201内のウエハ200、すなわち、表面に下地200a~200cがそれぞれ露出したウエハ200に対してDMATMSガスを供給する。
DMATMSガス供給流量:50~1000sccm、好ましくは50~500sccm
DMATMSガス供給時間:1~60分、好ましくは10~30分
N2ガス供給流量(ガス供給管毎):0~10000sccm
処理温度(第1温度):50~300℃、好ましくは80~200℃
処理圧力:10~1000Pa、好ましくは100~500Pa
が例示される。ここで述べた条件は、処理室201内においてDMATMSガスが気相分解(熱分解)しない条件である。
このステップでは、第1温度よりも高い第2温度下で、下地200b,200cの表面にDMATMSを吸着させた後のウエハ200を熱アニールするように、ヒータ207の出力を調整する。このステップは、バルブ243d~243fを開き、処理室201内へN2ガスを供給した状態で行ってもよく、また、バルブ243d~243fを閉じ、処理室201へのN2ガスの供給を停止した状態で行ってもよい。
N2ガス供給流量(ガス供給管毎):0~1000sccm、好ましくは50~500sccm
処理温度(第2温度):400~600℃、好ましくは450~550℃
処理圧力:1~1000Pa、好ましくは100~500Pa
処理時間:1分~12時間、好ましくは1~5時間
が例示される。
このステップでは、ステップC1,C2を順次実行する。
このステップでは、処理室201内のウエハ200、すなわち、熱アニール後のウエハ200に対してTiCl4ガスを供給する。
TiCl4ガス供給流量:1~1000sccm、好ましくは10~500sccm
TiCl4ガス供給時間:1~60秒、好ましくは2~10秒
処理温度(第3温度):50~250℃、好ましくは150~200℃
処理圧力:1~500Pa、好ましくは10~100Pa
が例示される。他の処理条件は、ステップAにおける処理条件と同様とする。
このステップでは、処理室201内のウエハ200、すなわち、下地200a上に形成されたTi含有層に対してNH3ガスを供給する。
NH3ガス供給流量:100~2000sccm、500~1000sccm
NH3ガス供給時間:10~200秒、好ましくは20~120秒
処理圧力:1~1000Pa、好ましくは50~500Pa
が例示される。他の処理条件は、ステップC1における処理条件と同様とする。
上述したステップC1,C2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、図5(d)に示すように、ウエハ200の表面に露出した下地200a~200cのうち下地200aの表面上にTiN膜を選択的に形成することができる。上述のサイクルは、複数回繰り返すのが好ましい。すなわち、1サイクルあたりに形成されるTiN層の厚さを所望の膜厚よりも薄くし、TiN層を積層することで形成される膜の膜厚が所望の膜厚になるまで、上述のサイクルを複数回繰り返すのが好ましい。
下地200aの表面上へのTiN膜の選択的な形成が完了した後、ノズル249a~249cのそれぞれからパージガスとしてのN2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)。
処理室201内の圧力が常圧に復帰された後、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)。処理済のウエハ200は、反応管203の外部に搬出された後、ボート217より取り出される(ウエハディスチャージ)。
本態様によれば、以下に示す1つ又は複数の効果が得られる。
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。
DMATMS→ANL→(TiCl4→NH3→O2)×n ⇒ TiON
DMATMS→ANL→(TiCl4→O3)×n ⇒ TiO
DMATMS→ANL→(4CS→NH3→O2)×n ⇒ SiON
DMATMS→ANL→(DCS→BCl3→NH3)×n ⇒ SiBN
DMATMS→ANL→(DCS→C3H6→BCl3→NH3)×n ⇒ SiBCN
DMATMS→ANL→(HCDS→C3H6→NH3)×n ⇒ SiCN
DMATMS→ANL→(HCDS→C3H6→NH3→O2)×n ⇒ SiOCN
DMATMS→ANL→(HCDS→TEA→O2)×n ⇒ SiOC(N)
DMATMS→ANL→(3DMAS→O3)×n ⇒ SiO
200a 下地(第1下地)
200b 下地(第2下地)
200c 下地(第3下地)
Claims (20)
- (a)第1温度下で、第1下地と第2下地とが表面に露出した基板に対して、吸着抑制剤を供給し、前記第1下地および前記第2下地のうち一方の下地の表面に吸着させる工程と、
(b)前記第1温度よりも高い第2温度下で、前記一方の下地の表面に前記吸着抑制剤を吸着させた後の前記基板を熱アニールする工程と、
(c)前記第2温度よりも低い第3温度下で、前記熱アニール後の前記基板に対して成膜ガスを供給することで、前記第1下地および前記第2下地のうち前記一方の下地とは異なる他方の下地の表面上に膜を形成する工程と、
を有する半導体装置の製造方法。 - (a)では、前記吸着抑制剤の前記他方の下地の表面への吸着を抑制しつつ、前記吸着抑制剤を前記一方の下地の表面に吸着させる請求項1に記載の半導体装置の製造方法。
- (a)を、前記吸着抑制剤が気相分解しない条件下で行う請求項1に記載の半導体装置の製造方法。
- (a)での前記一方の下地の表面への前記吸着抑制剤の吸着状態は、物理吸着を含む請求項1に記載の半導体装置の製造方法。
- (b)では、前記一方の下地の表面への前記吸着抑制剤の吸着状態を、化学吸着へ移行させる請求項4に記載の半導体装置の製造方法。
- (b)では、前記一方の下地の表面への前記吸着抑制剤の吸着状態を、(a)での前記一方の下地の表面への前記吸着抑制剤の吸着状態よりも安定な吸着状態へ変化させる請求項1に記載の半導体装置の製造方法。
- (c)では、前記一方の下地の表面上に前記膜を形成することなく、前記他方の下地の表面上に前記膜を形成する請求項1に記載の半導体装置の製造方法。
- 前記基板の表面には第3下地が更に露出しており、
(a)では、前記吸着抑制剤を、前記第3下地の表面に吸着させる請求項1に記載の半導体装置の製造方法。 - (a)での前記第3下地の表面への前記吸着抑制剤の吸着状態は、化学吸着を含む請求項8に記載の半導体装置の製造方法。
- (a)での前記第3下地の表面への前記吸着抑制剤の吸着状態は、(a)での前記一方の下地の表面への前記吸着抑制剤の吸着状態よりも安定な吸着状態である請求項8に記載の半導体装置の製造方法。
- (c)では、前記一方の下地の表面上、および、前記第3下地の表面上に前記膜を形成することなく、前記他方の下地の表面上に前記膜を形成する請求項8に記載の半導体装置の製造方法。
- 前記第1下地は酸素非含有の金属元素含有膜を含み、前記第2下地は酸素非含有の半金属元素含有膜を含み、前記第3下地は酸素含有膜を含む請求項8に記載の半導体装置の製造方法。
- 前記第1下地は導電性の金属元素含有膜を含み、前記第2下地は窒化膜を含み、前記第3下地は酸化膜を含む請求項8に記載の半導体装置の製造方法。
- 前記第1下地は遷移金属含有膜を含み、前記第2下地はシリコンおよび窒素を含有する膜を含み、前記第3下地はシリコンおよび酸素を含有する膜を含む請求項8に記載の半導体装置の製造方法。
- 前記一方の下地は前記第2下地であり、前記他方の下地は前記第1下地である請求項12に記載の半導体装置の製造方法。
- 前記第1下地は酸素非含有の金属元素含有膜を含み、前記第2下地は酸素非含有の半金属元素含有膜を含む請求項1に記載の半導体装置の製造方法。
- 前記一方の下地は前記第2下地であり、前記他方の下地は前記第1下地である請求項16に記載の半導体装置の製造方法。
- (a)、(b)、および(c)のうち少なくともいずれかをノンプラズマの雰囲気下で行う請求項1~17のいずれかに記載の半導体装置の製造方法。
- 基板が処理される処理室と、
前記処理室内の基板に対して吸着抑制剤を供給する吸着抑制剤供給系と、
前記処理室内の基板に対して成膜ガスを供給する成膜ガス供給系と、
前記処理室内の基板を加熱するヒータと、
前記処理室内において、(a)第1温度下で、第1下地と第2下地とが表面に露出した基板に対して、前記吸着抑制剤を供給し、前記第1下地および前記第2下地のうち一方の下地の表面に吸着させる処理と、(b)前記第1温度よりも高い第2温度下で、前記一方の下地の表面に前記吸着抑制剤を吸着させた後の前記基板を熱アニールする処理と、(c)前記第2温度よりも低い第3温度下で、前記熱アニール後の前記基板に対して前記成膜ガスを供給することで、前記第1下地および前記第2下地のうち前記一方の下地とは異なる他方の下地の表面上に膜を形成する処理と、を行わせるように、前記吸着抑制剤供給系、前記成膜ガス供給系、および前記ヒータ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。 - 基板処理装置の処理室内において、
(a)第1温度下で、第1下地と第2下地とが表面に露出した基板に対して、吸着抑制剤を供給し、前記第1下地および前記第2下地のうち一方の下地の表面に吸着させる手順と、
(b)前記第1温度よりも高い第2温度下で、前記一方の下地の表面に前記吸着抑制剤を吸着させた後の前記基板を熱アニールする手順と、
(c)前記第2温度よりも低い第3温度下で、前記熱アニール後の前記基板に対して成膜ガスを供給することで、前記第1下地および前記第2下地のうち前記一方の下地とは異なる他方の下地の表面上に膜を形成する手順と、
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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| KR1020217030315A KR102685504B1 (ko) | 2019-03-20 | 2019-03-20 | 반도체 장치의 제조 방법, 기판 처리 방법, 기판 처리 장치 및 프로그램 |
| CN201980088596.6A CN113316836B (zh) | 2019-03-20 | 2019-03-20 | 半导体器件的制造方法、衬底处理方法、衬底处理装置及记录介质 |
| JP2021506099A JP7166431B2 (ja) | 2019-03-20 | 2019-03-20 | 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 |
| SG11202110268WA SG11202110268WA (en) | 2019-03-20 | 2019-03-20 | Method of manufacturing semiconductor device, method of processing substrate, substrate processing apparatus, and program |
| TW109105947A TWI730638B (zh) | 2019-03-20 | 2020-02-25 | 半導體裝置之製造方法、基板處理裝置及記錄媒體 |
| US17/477,058 US20220005685A1 (en) | 2019-03-20 | 2021-09-16 | Method of manufacturing semiconductor device, method of processing substrate, substrate processing apparatus, and recording medium |
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| JPWO2020188801A1 (ja) | 2020-09-24 |
| KR20210128475A (ko) | 2021-10-26 |
| KR102685504B1 (ko) | 2024-07-17 |
| TW202104633A (zh) | 2021-02-01 |
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