WO2023073924A1 - 半導体装置の製造方法、基板処理方法、基板処理装置及び記録媒体 - Google Patents
半導体装置の製造方法、基板処理方法、基板処理装置及び記録媒体 Download PDFInfo
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- WO2023073924A1 WO2023073924A1 PCT/JP2021/040027 JP2021040027W WO2023073924A1 WO 2023073924 A1 WO2023073924 A1 WO 2023073924A1 JP 2021040027 W JP2021040027 W JP 2021040027W WO 2023073924 A1 WO2023073924 A1 WO 2023073924A1
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- oxygen
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- RLOWWWKZYUNIDI-UHFFFAOYSA-N phosphinic chloride Chemical compound ClP=O RLOWWWKZYUNIDI-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/283—Deposition of conductive or insulating materials for electrodes conducting electric current
- H01L21/285—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation
- H01L21/28506—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers
- H01L21/28512—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table
- H01L21/28556—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table by chemical means, e.g. CVD, LPCVD, PECVD, laser CVD
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/02—Pretreatment of the material to be coated
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/06—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 deposition of metallic material
- C23C16/16—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 deposition of metallic material from metal carbonyl compounds
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—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
- C23C16/45529—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 specially adapted for making a layer stack of alternating different compositions or gradient compositions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02172—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 at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/283—Deposition of conductive or insulating materials for electrodes conducting electric current
- H01L21/285—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
Definitions
- the present disclosure relates to a semiconductor device manufacturing method, a substrate processing method, a substrate processing apparatus, and a recording medium.
- a film forming process for forming a film on a substrate accommodated in a processing chamber may be performed (see Patent Document 1, for example).
- the underlying film when forming a metal-containing film containing a metal element on an underlying film, the underlying film may be oxidized and impurities may be included in the metal-containing film.
- An object of the present disclosure is to provide a technique capable of improving the properties of a metal-containing film formed on an underlying film while suppressing oxidation of the underlying film.
- FIG. 1 is a vertical cross-sectional view showing an outline of a vertical processing furnace of a substrate processing apparatus according to an embodiment of the present disclosure
- FIG. FIG. 2 is a schematic cross-sectional view taken along line AA in FIG. 1
- 1 is a schematic configuration diagram of a controller of a substrate processing apparatus according to an embodiment of the present disclosure, and is a block diagram showing a control system of the controller
- FIG. FIG. 4 is a diagram showing a substrate processing process in one embodiment of the present disclosure
- FIG. 5A is a cross-sectional view of a substrate showing a state before a metal-containing film is formed in recesses on the substrate
- FIG. FIG. 5C is a cross-sectional view of the substrate showing a state in which the film is etched
- FIG. 10 is a diagram showing a modification of the substrate processing process in one embodiment of the present disclosure
- FIG. 10 is a diagram showing a modification of the substrate processing process in one embodiment of the present disclosure
- FIG. 10 is a diagram showing a modification of the substrate processing process in one embodiment of the present disclosure
- FIG. 10 is a diagram showing a modification of the substrate processing process in one embodiment of the present disclosure
- FIG. 10 is a diagram showing a modification of the substrate processing process in one embodiment of the present disclosure
- FIG. 10 is a diagram showing a modification of the substrate processing process in one embodiment of the present disclosure
- FIG. 10 is a diagram showing a modification of the substrate processing process in one embodiment of the present disclosure
- FIG. 10 is a diagram showing a modification of the substrate processing process in one embodiment of the present disclosure
- FIG. 10 is a diagram showing a modification of the substrate processing process in one embodiment of the present disclosure
- 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 necessarily match the actual ones. Moreover, the dimensional relationship of each element, the ratio of each element, etc. do not necessarily match between a plurality of drawings.
- the substrate processing apparatus 10 includes a processing furnace 202 provided with a heater 207 as heating means (heating mechanism, heating system).
- the heater 207 has a cylindrical shape and is vertically installed by being supported by a heater base (not shown) as a holding plate.
- an outer tube 203 forming a reaction vessel is arranged concentrically with the heater 207 .
- the outer tube 203 is made of a heat-resistant material such as quartz (SiO 2 ) or silicon carbide (SiC), and has a cylindrical shape with a closed upper end and an open lower end.
- a manifold (inlet flange) 209 is arranged concentrically with the outer tube 203 below the outer tube 203 .
- the manifold 209 is made of metal such as stainless steel (SUS), and has a cylindrical shape with open top and bottom ends.
- An O-ring 220a is provided between the upper end of the manifold 209 and the outer tube 203 as a sealing member.
- An inner tube 204 forming a reaction container is arranged inside the outer tube 203 .
- the inner tube 204 is made of a heat-resistant material such as quartz (SiO 2 ) or silicon carbide (SiC), and has a cylindrical shape with a closed upper end and an open lower end.
- a processing vessel (reaction vessel) is mainly composed of the outer tube 203 , the inner tube 204 and the manifold 209 .
- a processing chamber 201 is formed in the cylindrical hollow portion of the processing container (inside the inner tube 204).
- the processing chamber 201 is configured so that the wafers 200 as substrates can be accommodated in a boat 217 (to be described later) arranged horizontally in multiple stages in the vertical direction.
- Nozzles 410 , 420 , 430 , 440 are provided in the processing chamber 201 so as to penetrate the side wall of the manifold 209 and the inner tube 204 .
- Gas supply pipes 310, 320, 330 and 340 are connected to the nozzles 410, 420, 430 and 440, respectively.
- the processing furnace 202 of this embodiment is not limited to the form described above.
- mass flow controllers (MFC) 312, 322, 332, 342, which are flow controllers (flow control units), valves 314, 324, 334 and 344 are provided respectively.
- Gas supply pipes 510, 520, 530, 540 for supplying inert gas are connected to the gas supply pipes 310, 320, 330, 340 downstream of the valves 314, 324, 334, 344, respectively.
- MFCs 512, 522, 532, 542 as flow rate controllers (flow control units) and valves 514, 524, 534, 544 as on-off valves are provided in this order from the upstream side. is provided.
- Nozzles 410, 420, 430, and 440 are connected to the tip portions of the gas supply pipes 310, 320, 330, and 340, respectively.
- the nozzles 410 , 420 , 430 , 440 are configured as L-shaped nozzles, and their horizontal portions are provided so as to penetrate the side wall of the manifold 209 and the inner tube 204 .
- the vertical portions of the nozzles 410, 420, 430, and 440 protrude outward in the radial direction of the inner tube 204 and extend in the vertical direction inside the channel-shaped (groove-shaped) preliminary chamber 201a. It is provided along the inner wall of the inner tube 204 in the preliminary chamber 201a and directed upward (upward in the direction in which the wafers 200 are arranged).
- the nozzles 410 , 420 , 430 , 440 are provided so as to extend from the lower region of the processing chamber 201 to the upper region of the processing chamber 201 , and have a plurality of gas supply holes 410 a, 410 a, 410 a and 440 , respectively. 420a, 430a and 440a are provided. Thereby, the processing gas is supplied to the wafer 200 from the gas supply holes 410a, 420a, 430a, 440a of the nozzles 410, 420, 430, 440, respectively.
- a plurality of gas supply holes 410a, 420a, 430a, and 440a are provided from the lower portion to the upper portion of the inner tube 204, each having the same opening area and the same opening pitch.
- the gas supply holes 410a, 420a, 430a, and 440a are not limited to the forms described above.
- the opening area may gradually increase from the bottom to the top of the inner tube 204 . This makes it possible to make the flow rate of the gas supplied from the gas supply holes 410a, 420a, 430a, and 440a more uniform.
- a plurality of gas supply holes 410a, 420a, 430a, and 440a of the nozzles 410, 420, 430, and 440 are provided at height positions from the bottom to the top of the boat 217, which will be described later. Therefore, the processing gas supplied into the processing chamber 201 from the gas supply holes 410a, 420a, 430a, and 440a of the nozzles 410, 420, 430, and 440 spreads over the entire area of the wafers 200 accommodated from the bottom to the top of the boat 217. supplied.
- the nozzles 410 , 420 , 430 , 440 may be provided to extend from the lower region to the upper region of the processing chamber 201 , but may be provided to extend to the vicinity of the ceiling of the boat 217 . preferable.
- a metal-containing gas which is a raw material gas containing a metal element, is supplied from the gas supply pipe 310 into the processing chamber 201 via the MFC 312 , the valve 314 and the nozzle 410 as the processing gas.
- a reducing gas is supplied as a processing gas from the gas supply pipe 320 into the processing chamber 201 via the MFC 322 , the valve 324 and the nozzle 420 .
- An oxygen-containing gas which is a gas containing oxygen atoms (O) is supplied from the gas supply pipe 330 into the processing chamber 201 via the MFC 332 , the valve 334 and the nozzle 430 as the processing gas.
- a halogen-containing gas which is a gas containing a halogen element, is supplied from the gas supply pipe 340 into the processing chamber 201 via the MFC 342 , the valve 344 and the nozzle 440 as the processing gas.
- the inert gas is supplied to the processing chamber 201 through MFCs 512, 522, 532, 542, valves 514, 524, 534, 544, nozzles 410, 420, 430, 440, respectively. supplied within.
- the inert gas for example, nitrogen (N 2 ) gas, rare gas such as argon (Ar) gas, helium (He) gas, neon (Ne) gas, and xenon (Xe) gas can be used.
- nitrogen (N 2 ) gas rare gas such as argon (Ar) gas, helium (He) gas, neon (Ne) gas, and xenon (Xe) gas can be used.
- Ar argon
- He helium
- Ne neon
- Xe xenon
- a processing gas supply system is mainly composed of gas supply pipes 310, 320, 330, 340, MFCs 312, 322, 332, 342, valves 314, 324, 334, 344, and nozzles 410, 420, 430, 440. Only the nozzles 410, 420, 430, 440 may be considered as the processing gas supply system.
- the processing gas supply system may simply be referred to as a gas supply system.
- the reducing gas supply system is mainly composed of the gas supply pipe 320, the MFC 322, and the valve 324, but the nozzle 420 may be included in the reducing gas supply system.
- the oxygen-containing gas is supplied from the gas supply pipe 330
- the oxygen-containing gas supply system is mainly composed of the gas supply pipe 330, the MFC 332, and the valve 334, and the nozzle 430 is included in the oxygen-containing gas supply system.
- the halogen-containing gas is supplied from the gas supply pipe 340, the gas supply pipe 340, the MFC 342, and the valve 344 mainly constitute the halogen-containing gas supply system.
- An inert gas supply system is mainly composed of gas supply pipes 510, 520, 530, 540, MFCs 512, 522, 532, 542, and valves 514, 524, 534, 544.
- An inert gas supply system may be referred to as a noble gas supply system.
- the method of gas supply in this embodiment includes nozzles 410 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 , 420 . 430, 440 to convey gas.
- Gas is jetted into the inner tube 204 from a plurality of gas supply holes 410a, 420a, 430a, 440a provided in the nozzles 410, 420, 430, 440 at positions facing the wafer. More specifically, the gas supply hole 410 a of the nozzle 410 , the gas supply hole 420 a of the nozzle 420 , the gas supply hole 430 a of the nozzle 430 , and the gas supply hole 440 a of the nozzle 440 allow the processing gas to flow in the direction parallel to the surface of the wafer 200 . Etc. are being ejected.
- the exhaust hole (exhaust port) 204a is a through hole formed in a side wall of the inner tube 204 at a position facing the nozzles 410, 420, 430, and 440, and is, for example, a vertically elongated slit-like opening. It is a through hole.
- the gas supplied into the processing chamber 201 from the gas supply holes 410a, 420a, 430a, and 440a of the nozzles 410, 420, 430, and 440 and flowed over the surface of the wafer 200 passes through the exhaust hole 204a to the inner tube 204 and the outer tube. It flows into the exhaust path 206 formed by the gap formed between the tube 203 and the tube 203 . Then, the gas that has flowed into the exhaust path 206 flows into the exhaust pipe 231 and is discharged out of the processing furnace 202 .
- the exhaust holes 204a are provided at positions facing the plurality of wafers 200, and the gas supplied to the vicinity of the wafers 200 in the processing chamber 201 from the gas supply holes 410a, 420a, 430a, and 440a flows horizontally. , and then flows into the exhaust path 206 via the exhaust hole 204a.
- the exhaust hole 204a is not limited to being configured as a slit-shaped through hole, and may be configured by a plurality of holes.
- the manifold 209 is provided with an exhaust pipe 231 for exhausting the atmosphere inside the processing chamber 201 .
- the exhaust pipe 231 includes, in order from the upstream side, a pressure sensor 245 as a pressure detector (pressure detection unit) for detecting the pressure in the processing chamber 201, an APC (Auto Pressure Controller) valve 243, and a vacuum pump as an evacuation device. 246 are connected.
- the APC valve 243 can evacuate the processing chamber 201 and stop the evacuation by opening and closing the valve while the vacuum pump 246 is in operation. By adjusting the degree of opening, the pressure inside the processing chamber 201 can be adjusted.
- An exhaust system is mainly composed of the exhaust hole 204 a , the exhaust path 206 , the exhaust pipe 231 , the APC valve 243 and the pressure sensor 245 .
- a vacuum pump 246 may be considered to be included in the exhaust system.
- a seal cap 219 is provided below the manifold 209 as a furnace mouth cover capable of airtightly closing the lower end opening of the manifold 209 .
- the seal cap 219 is configured to contact the lower end of the manifold 209 from below in the vertical direction.
- the seal cap 219 is made of metal such as SUS, and is shaped like a disc.
- An O-ring 220 b is provided on the upper surface of the seal cap 219 as a sealing member that contacts the lower end of the manifold 209 .
- a rotating mechanism 267 for rotating the boat 217 containing the wafers 200 is installed on the side of the seal cap 219 opposite to the processing chamber 201 .
- a rotating shaft 255 of the rotating mechanism 267 passes through the seal cap 219 and is connected to the boat 217 .
- the rotating mechanism 267 is configured to rotate the wafers 200 by rotating the boat 217 .
- the seal cap 219 is configured to be vertically moved up and down by a boat elevator 115 as a lifting mechanism installed vertically outside the outer tube 203 .
- the boat elevator 115 is configured to move the boat 217 into and out of the processing chamber 201 by raising and lowering the seal cap 219 .
- the boat elevator 115 is configured as a transport device (transport system) that transports the boat 217 and the wafers 200 housed in the boat 217 into and out of the processing chamber 201 .
- a boat 217 as a substrate support is configured to arrange a plurality of wafers 200, for example, 25 to 200 wafers 200 in a horizontal posture and with their centers aligned with each other at intervals in the vertical direction. .
- the boat 217 is made of a heat-resistant material such as quartz or SiC.
- the lower portion of the boat 217 is supported by a heat-insulating cylinder 218, which is a cylindrical member made of a heat-resistant material such as quartz or SiC.
- This configuration makes it difficult for heat from the heater 207 to be transmitted to the seal cap 219 side.
- this embodiment is not limited to the form described above.
- heat-insulating plates made of a heat-resistant material such as quartz or SiC may be horizontally supported in multiple stages (not shown) below the boat 217.
- a temperature sensor 263 as a temperature detector is installed in the inner tube 204.
- the temperature inside the processing chamber 201 is configured to have a desired temperature distribution.
- the temperature sensor 263 is L-shaped like the nozzles 410 , 420 , 430 , 440 and is provided along the inner wall of the inner tube 204 .
- the controller 121 which is a control unit (control means), is configured as a computer equipped with a CPU (Central Processing Unit) 121a, a RAM (Random Access Memory) 121b, a storage device 121c, and an I/O port 121d. It is The RAM 121b, storage device 121c, and I/O port 121d are configured to be able to exchange data with the CPU 121a via an internal bus.
- An input/output device 122 configured as, for example, a touch panel or the like is connected to the controller 121 .
- the storage device 121c is composed of, for example, a flash memory, HDD (Hard Disk Drive), or the like.
- a control program for controlling the operation of the substrate processing apparatus, a process recipe describing procedures and conditions of a semiconductor device manufacturing method (substrate processing method) described later, and the like are stored in a readable manner.
- the process recipe is a combination that causes the controller 121 to execute each process (each step) in a method for manufacturing a semiconductor device (substrate processing method) to be described later, so that a predetermined result can be obtained, and functions as a program. do.
- this process recipe, control program, etc. will be collectively referred to simply as a program.
- program may include only a process recipe alone, may include only a control program alone, or may include a combination of a process recipe and a control program.
- the RAM 121b is configured as a memory area (work area) in which programs and data read by the CPU 121a are temporarily held.
- the I/O port 121d includes the above MFCs 312, 322, 332, 342, 512, 522, 532, 542, valves 314, 324, 334, 344, 514, 524, 534, 544, pressure sensor 245, APC valve 243, It is connected to the vacuum pump 246, the heater 207, the temperature sensor 263, the rotating mechanism 267, the boat elevator 115, and the like.
- the CPU 121a is configured to read and execute a control program from the storage device 121c, and to read recipes and the like from the storage device 121c in response to input of operation commands from the input/output device 122 and the like.
- the CPU 121a adjusts the flow rate of various gases by the MFCs 312, 322, 332, 342, 512, 522, 532, 542, the valves 314, 324, 334, 344, 514, 524, 534 so as to follow the content of the read recipe.
- the opening and closing operation of the APC valve 243 the opening and closing operation of the APC valve 243, the pressure adjustment operation by the APC valve 243 based on the pressure sensor 245, the temperature adjustment operation of the heater 207 based on the temperature sensor 263, the start and stop of the vacuum pump 246, and the rotation mechanism 267. It is configured to be able to control the rotation of the boat 217 and the rotation speed adjustment operation, the lifting operation of the boat 217 by the boat elevator 115, the storage operation of the wafers 200 in the boat 217, and the like.
- the controller 121 is stored in an external storage device 123 (for example, a magnetic tape, a magnetic disk such as a flexible disk or a hard disk, an optical disk such as a CD or DVD, a magneto-optical disk such as an MO, or a semiconductor memory such as a USB memory or a memory card).
- the program described above can be configured by installing it in a computer.
- the storage device 121c and the external storage device 123 are configured as computer-readable recording media. Hereinafter, these are also collectively referred to simply as recording media.
- the recording medium may include only the storage device 121c alone, or may include only the external storage device 123 alone, or may include both.
- the program may be provided to the computer without using the external storage device 123, but using communication means such as the Internet or a dedicated line.
- Substrate processing step An example of a process of forming a metal-containing film 600 containing a metal element on a wafer 200 on which a metal-containing film 300 containing a metal element is formed as a base film, as one process of manufacturing a semiconductor device. will be described with reference to FIG.
- the process of forming the metal-containing film 600 on the wafer 200 on which the metal-containing film 300 is formed is performed using the processing furnace 202 of the substrate processing apparatus 10 described above.
- the controller 121 controls the operation of each component of the substrate processing apparatus 10 .
- the substrate processing step semiconductor device manufacturing step
- wafer When the term “wafer” is used in this specification, it may mean “the wafer itself” or “a laminate of a wafer and a predetermined layer or film formed on its surface”. be.
- wafer surface when the term “wafer surface” is used, it may mean “the surface of the wafer itself” or “the surface of a predetermined layer, film, etc. formed on the wafer”. be.
- substrate in this specification is synonymous with the use of the term "wafer”.
- the inside of the processing chamber 201 that is, the space in which the wafer 200 exists is evacuated by the vacuum pump 246 to a desired pressure (degree of vacuum). At this time, the pressure in the processing chamber 201 is measured by the pressure sensor 245, and the APC valve 243 is feedback-controlled based on the measured pressure information (pressure adjustment). The vacuum pump 246 is kept in operation at least until the processing of the wafer 200 is completed.
- the inside of the processing chamber 201 is heated by the heater 207 so as to reach a desired temperature.
- the amount of power supplied 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). Heating in the processing chamber 201 by the heater 207 is continued at least until the processing of the wafer 200 is completed.
- the metal-containing film 300 serving as the base film at least one of metal elements and transition metals (transition elements) such as tungsten (W), molybdenum (Mo), copper (Cu), and cobalt (Co) is used. Membranes containing one or more can be used.
- the metal-containing film 300 can be used as a metal wiring, and the metal-containing film 300 may be the metal wiring M1 in the lowest layer of the wiring layer or the metal wiring My in the middle layer (y is a natural number).
- a metal-containing film 300 is formed on a wafer 200, an insulating film 400 is formed on the metal-containing film 300, and recesses 400a such as trenches and holes are formed in the insulating film 400.
- metal oxide which is a natural oxide film, is formed on the surface of the metal-containing film 300 in the concave portion 400a.
- a film 500 may be formed.
- transition metals such as W, Mo, Cu, and Co are easily oxidized, and a metal oxide film 500 may be formed on the surface.
- the contact resistance between the metal-containing film 300 and the metal-containing film 600 embedded in the recess 400a may increase.
- Ru ruthenium
- a halogen-containing film containing a halogen element is applied to the wafer 200 in the same processing chamber 201.
- a pretreatment step is performed to remove at least part of the metal oxide film 500 by supplying a gas. That is, the pretreatment process and the film formation process are continuously performed in the same processing chamber (in-situ). That is, after the metal oxide film 500 is removed by the pretreatment process, which will be described later, the metal-containing film 600 is formed by performing the film forming process, which will be described later, in the same processing chamber 201 .
- Pretreatment step (halogen-containing gas supply, step S1)
- the valve 344 is opened to allow the halogen-containing gas to flow through the gas supply pipe 340 .
- the flow rate of the halogen-containing gas is adjusted by the MFC 342 , supplied into the processing chamber 201 through the gas supply hole 440 a of the nozzle 440 , and exhausted through the exhaust pipe 231 .
- a halogen-containing gas is supplied to the wafer 200 .
- the valve 544 is opened to allow inert gas to flow through the gas supply pipe 540 .
- the inert gas flowing through the gas supply pipe 540 is adjusted in flow rate by the MFC 542 , supplied into the processing chamber 201 together with the halogen-containing gas, and exhausted through the exhaust pipe 231 .
- the valves 514 , 524 , 534 are opened to allow inert gas to flow through the gas supply pipes 510 , 520 , 530 in order to prevent the halogen-containing gas from entering the nozzles 410 , 420 , 430 .
- Inert gas is supplied into the processing chamber 201 through gas supply pipes 310 , 320 , 330 and nozzles 410 , 420 , 430 and exhausted through an exhaust pipe 231 .
- the APC valve 243 is adjusted so that the pressure inside the processing chamber 201 is within the range of 1 to 3990 Pa, for example.
- the supply flow rate of the halogen-containing gas controlled by the MFC 342 is, for example, a flow rate within the range of 0.05 to 20 slm.
- the supply flow rates of the inert gases controlled by the MFCs 512, 522, 532, and 542 are, for example, within the range of 0.1 to 50 slm.
- the notation of a numerical range such as "1 to 3990 Pa" in the present disclosure means that the lower limit and the upper limit are included in the range. Therefore, for example, "1 to 3990 Pa” means “1 Pa or more and 3990 Pa or less". The same applies to other numerical ranges.
- the gases flowing in the processing chamber 201 are only the halogen-containing gas and the inert gas.
- the halogen-containing gas undergoes a substitution reaction with at least part of the metal oxide film 500 formed on the metal-containing film 300 . That is, O in the metal oxide film 500 reacts with the halogen element, desorbs from the metal oxide film 500, and is discharged from the processing chamber 201 as a reaction by-product. That is, at least part of the metal oxide film 500 is removed (etched).
- halogen-containing gas for example, a gas capable of selectively etching only the metal oxide film 500 formed in the recess 400a on the wafer 200 is used.
- a gas containing one or more chlorine (Cl) atoms, which are halogen elements, and one or more oxygen (O) atoms, for example, can be used. That is, an oxyhalide having a molecular structure of MO x Cl y can be used as the halogen-containing gas.
- M includes at least one or more of phosphorus (P), sulfur (S), and carbon (C), for example.
- oxyhalide for example, phosphorus oxychloride (POCl 3 ), thionyl chloride (SOCl 2 ), carbonyl dichloride (COCl 2 ) gas, or the like can be used.
- POCl 3 phosphorus oxychloride
- SOCl 2 thionyl chloride
- COCl 2 carbonyl dichloride
- One or more of these can be used as the halogen-containing gas.
- the halogen-containing gas When an oxyhalide is used as the halogen-containing gas in this way, O in the metal oxide film 500 reacts with Cl and O, desorbs from the metal oxide film 500, and as shown in FIG. Only the metal oxide layer 500 can be selectively etched. For example, it is possible to selectively etch only the metal oxide film 500 without etching the insulating film 400 formed of a silicon oxide (SiO 2 ) film. That is, the halogen-containing gas can also be called an etching gas for etching the metal oxide film 500 .
- step S2 After a predetermined period of time, for example 1 to 600 seconds, has passed since the supply of the halogen-containing gas was started, the valve 344 of the gas supply pipe 340 is closed to stop the supply of the halogen-containing gas. That is, the time for which the halogen-containing gas is supplied to the wafer 200 is, for example, 1 to 600 seconds. At this time, while the APC valve 243 of the exhaust pipe 231 is kept open, the inside of the processing chamber 201 is evacuated by the vacuum pump 246, and the unreacted halogen remaining in the processing chamber 201 or the halogen after contributing to the etching of the metal oxide film 500 is removed.
- the contained gas is removed from the processing chamber 201 (the space in which the wafer 200 exists is evacuated). That is, the inside of the processing chamber 201 is purged. At this time, the valves 514 , 524 , 534 , 544 are kept open to maintain the supply of the inert gas into the processing chamber 201 .
- the inert gas acts as a purge gas, and can enhance the effect of removing from the processing chamber 201 the halogen-containing gas remaining in the processing chamber 201 that has not reacted or has contributed to etching.
- the pretreatment process described above can also be referred to as a metal oxide film removal process, a pre-etching process, or a pre-cleaning process.
- Metal-containing film formation process [First metal-containing film forming step] (Metal-containing gas supply, step S11)
- the valve 314 is opened to allow the metal-containing gas, which is the raw material gas, to flow through the gas supply pipe 310 .
- the flow rate of the metal-containing gas is adjusted by the MFC 312 , supplied into the processing chamber 201 through the gas supply hole 410 a of the nozzle 410 , and exhausted through the exhaust pipe 231 .
- the valve 514 is opened to allow inert gas to flow through the gas supply pipe 510 .
- the inert gas flowing through the gas supply pipe 510 is adjusted in flow rate by the MFC 512 , supplied into the processing chamber 201 together with the metal-containing gas, and exhausted through the exhaust pipe 231 .
- the valves 524 , 534 , 544 are opened to allow the inert gas to flow through the gas supply pipes 520 , 530 , 540 in order to prevent the metal-containing gas from entering the nozzles 420 , 430 , 440 .
- Inert gas is supplied into the processing chamber 201 through gas supply pipes 320 , 330 , 340 and nozzles 420 , 430 , 440 and exhausted through an exhaust pipe 231 .
- the APC valve 243 is adjusted so that the pressure inside the processing chamber 201 is within the range of 1 to 3990 Pa, for example.
- the supply flow rate of the metal-containing gas controlled by the MFC 312 is, for example, a flow rate within the range of 0.05 to 1 slm.
- the supply flow rates of the inert gases controlled by the MFCs 512, 522, 532, and 542 are, for example, within the range of 0.1 to 50 slm.
- the gas flowing in the processing chamber 201 is only the metal-containing gas and the inert gas. That is, as shown in FIG. 5B, the metal-containing gas is supplied to the wafer 200 from which the metal oxide film 500 has been removed, and the metal-containing gas is supplied to the wafer 200 (the insulating film 400 on the surface and the recess 400a). A layer is formed.
- the metal-containing layer may be a metal layer containing other elements, or may be an adsorption layer for a metal-containing gas.
- a gas containing, for example, a transition metal (transition element) can be used as a metal element.
- a gas containing a group 8 element that is a platinum group element can be used.
- a Ru-containing gas containing ruthenium (Ru) can be used.
- Metal- containing gases include, for example, bisethylcyclopentadienyl ruthenium ( Ru ( C2H5C5H4 ) 2 ), butylruthenocene ( Ru( C5H5 ) ( C4H9C5H4 ), tris 2,4 octanedionate torthenium ( Ru[ CH3COCHCO ( CH2 ) 3CH3 ] 3 ), 2,4 dimethylpentadienylethylcyclopentadienylruthenium ( Ru( C2H5C5H4 ) ( (CH 3 )C 5 H 5 )), Ru(C 7 H 8 )(C 7 H 11 O 2 ), dicarbonylbis(5-methyl-2,4-hexanediketonate)ruthenium(II)(C 16 H 22 O 6 Ru), triruthenium dodecacarbonyl (Ru 3 (CO) 12 ), ⁇ 4-2,3-dimethylbutadiene ruthenium tricarbon
- a Ru-containing layer is formed in the concave portion 400a on the wafer 200.
- the Ru-containing layer may be a Ru layer containing other elements, an adsorption layer of Ru-containing gas, or both of them.
- step S12 After a predetermined period of time, for example, 1 to 120 seconds, has passed since the metal-containing gas started to be supplied, the valve 314 of the gas supply pipe 310 is closed to stop the supply of the metal-containing gas. In other words, the time for which the metal-containing gas is supplied to the wafer 200 is, for example, 1 to 120 seconds.
- the APC valve 243 of the exhaust pipe 231 is kept open, the inside of the processing chamber 201 is evacuated by the vacuum pump 246, and the unreacted metal-containing gas remaining in the processing chamber 201 or after contributing to the formation of the metal-containing layer is removed. is removed from the processing chamber 201 . That is, the inside of the processing chamber 201 is purged.
- valves 514 , 524 , 534 , 544 are kept open to maintain the supply of the inert gas into the processing chamber 201 .
- the inert gas acts as a purge gas, and can enhance the effect of removing from the processing chamber 201 unreacted metal-containing gas remaining in the processing chamber 201 or after contributing to the formation of the metal-containing layer.
- the valve 324 is opened to allow the reducing gas to flow through the gas supply pipe 320 .
- the flow rate of the reducing gas is adjusted by the MFC 322 , supplied into the processing chamber 201 through the gas supply hole 420 a of the nozzle 420 , and exhausted through the exhaust pipe 231 .
- a reducing gas is supplied to the wafer 200 .
- the valve 524 is opened to allow inert gas to flow through the gas supply pipe 520 .
- the flow rate of the inert gas flowing through the gas supply pipe 520 is adjusted by the MFC 522 .
- the inert gas is supplied into the processing chamber 201 together with the reducing gas and exhausted through the exhaust pipe 231 .
- the valves 514 , 534 , 544 are opened to allow inert gas to flow through the gas supply pipes 510 , 530 , 540 in order to prevent the reducing gas from entering the nozzles 410 , 430 , 440 .
- Inert gas is supplied into the processing chamber 201 through gas supply pipes 310 , 330 , 340 and nozzles 410 , 430 , 440 and exhausted through an exhaust pipe 231 .
- the APC valve 243 is adjusted so that the pressure inside the processing chamber 201 is within the range of 5 to 15000 Pa, for example.
- the supply flow rate of the reducing gas controlled by the MFC 322 is, for example, 1 to 100 slm, preferably 15 to 50 slm.
- the supply flow rate of the inert gas controlled by the MFCs 512 to 542 is, for example, within the range of 0.1 to 50 slm.
- the pressure (total pressure) of the space where the wafer 200 exists which is the pressure in the processing chamber 201 in this step, is made higher than the pressure (total pressure) of the space where the wafer 200 exists in step S23 described later. That is, the pressure inside the processing chamber 201 in this step is made higher than the pressure inside the processing chamber 201 in step S23 described later.
- the pressure in the processing chamber 201 is set to a high pressure during the supply of the reducing gas in all steps of the substrate processing process, time is required to adjust the pressure from a low pressure to a high pressure between the supply of the metal-containing gas and the supply of the reducing gas.
- the inside of the processing chamber 201 is pressurized when the reducing gas is supplied in the first half of the first metal-containing film forming step, and the pressure in the processing chamber 201 is increased when the reducing gas is supplied in the latter half of the second metal-containing film forming step.
- productivity can be improved.
- the partial pressure of the reducing gas in this step may be higher than the partial pressure of the reducing gas in step S23, which will be described later.
- At least one of the pressure in the processing chamber 201 and the partial pressure of the reducing gas in this step may be changed every predetermined cycle (first number of times). In other words, each time the number of cycles (first number) of the first metal-containing film forming step is repeated, at least the pressure in the processing chamber 201 during supply of the reducing gas in this step and the partial pressure of the reducing gas You may change either. Specifically, in this step, at least one of the pressure inside the processing chamber 201 and the partial pressure of the reducing gas may be decreased every predetermined cycle (first number of times).
- the gases flowing in the processing chamber 201 are only reducing gas and inert gas.
- reducing gas for example, hydrogen (H 2 ) gas, deuterium (D 2 ) gas, gas containing activated hydrogen, etc., which are hydrogen (H)-containing gases, can be used.
- hydrogen (H 2 ) gas deuterium (D 2 ) gas, gas containing activated hydrogen, etc., which are hydrogen (H)-containing gases
- One or more of these can be used as the reducing gas.
- the H 2 gas undergoes a substitution reaction with at least part of the metal-containing layer formed on the wafer 200 in step S11.
- a gas containing a metal element and a carbonyl group is used as the metal-containing gas
- O or the like in the metal-containing layer reacts with H 2 and desorbs from the metal-containing layer to form water vapor (H 2 O) or the like.
- H 2 O water vapor
- a metal-containing layer containing a metal element and having O reduced is formed on the wafer 200 .
- valve 324 is closed to stop the supply of reducing gas. Then, the reducing gas and reaction by-products remaining in the processing chamber 201 after contributing to the formation of the metal-containing layer are removed from the processing chamber 201 by the same procedure as in step S12 described above. That is, the inside of the processing chamber 201 is purged.
- a wafer surface insulating film 400, a first metal-containing film 600a having a predetermined thickness is formed in the recess 400a, that is, on the metal-containing film 300 in the recess 400a.
- the above cycle is preferably repeated multiple times. As a result, the amount of the surface oxide layer of the metal-containing film 300 can be reduced, and the first metal-containing film 600a in which the growth of the interface oxide layer is suppressed can be formed.
- Valve 314 is opened to allow metal-containing gas to flow through gas supply tube 310 .
- the metal-containing gas used in this step may be the same gas as the metal-containing gas used in the first metal-containing film forming step, or may be a different type of metal-containing gas. .
- the flow rate of the metal-containing gas is adjusted by the MFC 312 , supplied into the processing chamber 201 through the gas supply hole 410 a of the nozzle 410 , and exhausted through the exhaust pipe 231 . At this time, a metal-containing gas is supplied to the wafer 200 .
- valve 514 is opened to allow inert gas to flow through the gas supply pipe 510 .
- the inert gas flowing through the gas supply pipe 510 is adjusted in flow rate by the MFC 512 , supplied into the processing chamber 201 together with the metal-containing gas, and exhausted through the exhaust pipe 231 .
- the valves 524 , 523 , 544 are opened to allow inert gas to flow through the gas supply pipes 520 , 530 , 540 in order to prevent the metal-containing gas from entering the nozzles 420 , 430 , 440 .
- Inert gas is supplied into the processing chamber 201 through gas supply pipes 320 , 330 , 340 and nozzles 420 , 430 , 440 and exhausted through an exhaust pipe 231 .
- the APC valve 243 is adjusted so that the pressure inside the processing chamber 201 is within the range of 1 to 3990 Pa, for example.
- the supply flow rate of the metal-containing gas controlled by the MFC 312 is, for example, a flow rate within the range of 0.05 to 1 slm.
- the supply flow rates of the inert gases controlled by the MFCs 512, 522, 532, and 542 are, for example, within the range of 0.1 to 50 slm.
- the gas flowing in the processing chamber 201 is only the metal-containing gas and the inert gas. That is, the metal-containing gas is supplied to the first metal-containing film 600a as shown in FIG. be.
- the metal-containing layer may be a metal layer containing other elements, or may be an adsorption layer for a metal-containing gas.
- step S22 After a predetermined period of time, for example, 1 to 120 seconds, has passed since the metal-containing gas started to be supplied, the valve 314 of the gas supply pipe 310 is closed to stop the supply of the metal-containing gas. Then, the metal-containing gas remaining in the processing chamber 201, which has not reacted or has contributed to the formation of the metal-containing layer, and reaction by-products are removed from the processing chamber 201 by the same processing procedure as in step S12 described above. That is, the inside of the processing chamber 201 is purged.
- a predetermined period of time for example, 1 to 120 seconds
- step S23 Simultaneous supply of reducing gas and oxygen-containing gas, step S23
- the valves 324 and 334 are opened to allow the reducing gas to flow into the gas supply pipe 320 and the small amount of oxygen-containing gas to flow into the gas supply pipe 330 .
- the reducing gas used in the second metal-containing film forming step may be the same gas as the reducing gas used in the above-described first metal-containing film forming step, or may be a different type of reducing gas. may The flow rate of the reducing gas is adjusted by the MFC 322 , supplied into the processing chamber 201 through the gas supply hole 420 a of the nozzle 420 , and exhausted through the exhaust pipe 231 .
- the flow rate of the oxygen-containing gas is adjusted by the MFC 332 , supplied into the processing chamber 201 through the gas supply hole 430 a of the nozzle 430 , and exhausted through the exhaust pipe 231 .
- the reducing gas and the oxygen-containing gas are simultaneously supplied to the wafer 200 . That is, the supply of the oxygen-containing gas is started simultaneously with the start of the supply of the reducing gas.
- the valves 524 and 534 are also opened at the same time to flow the inert gas into the gas supply pipes 520 and 530, respectively.
- the flow rate of the inert gas flowing through the gas supply pipes 520 and 530 is adjusted by the MFCs 522 and 532 .
- the inert gas is supplied into the processing chamber 201 together with the reducing gas and the oxygen-containing gas and exhausted through the exhaust pipe 231 .
- valves 514 and 544 are opened to allow inert gas to flow through gas supply pipes 510 and 540 in order to prevent reducing gas and oxygen-containing gas from entering nozzles 410 and 440 .
- the inert gas is supplied into the processing chamber 201 through gas supply pipes 310 and 340 and nozzles 410 and 440 and exhausted through an exhaust pipe 231 .
- the APC valve 243 is adjusted so that the pressure in the processing chamber 201 is within the range of 1 to 13000 Pa, for example.
- the supply flow rate of the reducing gas controlled by the MFC 322 is, for example, 1 to 100 slm, preferably 5 to 50 slm.
- the supply flow rate of the oxygen-containing gas controlled by the MFC 332 is, for example, 0.01 to 10 slm, preferably 0.1 to 5 slm.
- the supply flow rates of the inert gases controlled by the MFCs 512, 522, 532, and 542 are, for example, within the range of 0.1 to 50 slm.
- the gases flowing in the processing chamber 201 are only reducing gas, oxygen-containing gas, and inert gas. That is, the reducing gas and the oxygen-containing gas are supplied in parallel.
- the reducing gas and the oxygen-containing gas decompose the metal-containing gas and undergo a substitution reaction with at least part of the first metal-containing film 600 a formed on the wafer 200 .
- the decomposition effect of the metal-containing gas can be enhanced. That is, by performing this step, the organic ligands in the metal-containing gas can be removed.
- oxygen atoms can be reduced by the reducing gas and exhausted, and oxidation of the metal-containing film 300 can be suppressed.
- both effects of decomposition of the metal-containing gas and suppression of oxidation of the metal-containing film can be obtained.
- oxygen-containing gas examples include gases containing oxygen (O) atoms, such as oxygen (O 2 ) gas, ozone (O 3 ) gas, plasma-excited O 2 (O 2 * ) gas, and O 2 gas + hydrogen.
- O 2 gas examples include gases containing oxygen (O) atoms, such as oxygen (O 2 ) gas, ozone (O 3 ) gas, plasma-excited O 2 (O 2 * ) gas, and O 2 gas + hydrogen.
- H 2 ) gas, water vapor (H 2 O gas), hydrogen peroxide (H 2 O 2 ) gas, nitrous oxide (N 2 O) gas, nitric oxide (NO) gas, nitrogen dioxide (NO 2 ) gas , carbon monoxide (CO) gas, carbon dioxide (CO 2 ) gas, and the like can be used.
- gases containing oxygen (O) atoms such as oxygen (O 2 ) gas, ozone (O 3 ) gas, plasma-excited O 2 (O 2 * ) gas, and O 2 gas +
- the organic ligand in the first metal-containing film 600a is H 2 and O 2 , desorbed from the first metal-containing film 600a, and discharged from the processing chamber 201 as reaction by-products such as water vapor (H 2 O). Then, a metal-containing layer containing a metal element and substantially free of impurities is formed on the wafer 200 .
- step S24 the valves 324 and 334 are closed to simultaneously stop the supply of the reducing gas and the oxygen-containing gas. That is, the timing of stopping the supply of the reducing gas and the timing of stopping the supply of the oxygen-containing gas are made at the same time. By stopping the supply of the oxygen-containing gas at the same time that the supply of the reducing gas is stopped, oxygen atoms can be reduced by the reducing gas and exhausted, thereby suppressing the oxidation of the first metal-containing film 600a. be able to.
- the reducing gas, the oxygen-containing gas, and the reaction by-products remaining in the processing chamber 201 after contributing to the formation of the metal-containing layer are removed from the processing chamber 201 by the same processing procedure as in step S12 described above. Exclude. That is, the inside of the processing chamber 201 is purged.
- a second metal-containing film 600b having a predetermined thickness is formed on the first metal-containing film 600a formed on the wafer 200, and the metal-containing film 600 is modified. That is, a metal-containing film 600 can be formed on the metal-containing film 300, as shown in FIG. 5(E).
- the above cycle is preferably repeated multiple times.
- An inert gas is supplied into the processing chamber 201 from each of the gas supply pipes 510 to 540 and exhausted from the exhaust pipe 231 .
- the inert gas acts as a purge gas, thereby purging the inside of the processing chamber 201 with the inert gas and removing the gas remaining in the processing chamber 201 and reaction by-products from the inside of the processing chamber 201 (afterpurge).
- the atmosphere in the processing chamber 201 is replaced with an inert gas (inert gas replacement), and the pressure in the processing chamber 201 is returned to normal pressure (atmospheric pressure recovery).
- the growth of the oxide layer at the interface on the metal-containing film 300 is suppressed on the wafer 200 having the metal-containing film 300 formed on the surface thereof by the first metal-containing film forming step. Then, a first metal-containing film 600a is formed. Subsequently, a second metal-containing film forming step is performed to form a second metal-containing film 600b in which impurities such as organic ligands in the first metal-containing film 600a are reduced. This makes it possible to form the metal-containing film 600 from which impurities are removed while suppressing oxidation of the metal-containing film 300 on the metal-containing film 300 which is a base film.
- the number of cycles in the first metal-containing film forming step thickness of the first metal-containing film 600a
- the number of cycles in the second metal-containing film forming step the thickness of the second metal-containing film 600b
- FIG. 6 is a diagram showing a modification of the substrate processing process shown in FIG. 4 described above.
- the above-described substrate processing step and the second metal-containing film forming step are different. That is, in this modification, the timing of starting the supply of the reducing gas in step S23 of the second metal-containing film forming step is made different from the timing of starting the supply of the oxygen-containing gas.
- the end timing is made different from the end timing of the supply of the oxygen-containing gas. Specifically, after starting the supply of the reducing gas, the supply of the oxygen-containing gas is started, and after stopping the supply of the oxygen-containing gas, the supply of the reducing gas is stopped. That is, there is a timing for supplying the oxygen-containing gas and the reducing gas in parallel. Then, the pressure in the processing chamber 201 at the timing of supplying the oxygen-containing gas and the reducing gas in parallel is higher than the pressure in the processing chamber 201 at the timing of supplying only the reducing gas without parallel supply. do.
- FIG. 7 is a diagram showing a modification of the substrate processing process shown in FIG. 4 described above.
- the above-described substrate processing step and the second metal-containing film forming step are different. That is, in this modification, the timing of starting the supply of the reducing gas in step S23 of the second metal-containing film forming step is made different from the timing of starting the supply of the oxygen-containing gas. Specifically, the supply of the oxygen-containing gas is started after the supply of the reducing gas is started, and the supply of the reducing gas is stopped at the same time as the supply of the oxygen-containing gas is stopped. In other words, there is a timing for supplying the oxygen-containing gas and the reducing gas in parallel. Then, the pressure in the processing chamber 201 at the timing of supplying the oxygen-containing gas and the reducing gas in parallel is higher than the pressure in the processing chamber 201 at the timing of supplying only the reducing gas without parallel supply. do.
- FIG. 8 is a diagram showing a modification of the substrate processing process shown in FIG. 4 described above.
- the above-described substrate processing step and the second metal-containing film forming step are different. That is, in this modification, the supply of the oxygen-containing gas is started simultaneously with the start of the supply of the reducing gas in step S23 of the second metal-containing film forming step, and the timing of the end of the supply of the reducing gas and the oxygen-containing gas supply end timing. That is, the supply of the oxygen-containing gas is started simultaneously with the start of the supply of the reducing gas, and after the supply of the oxygen-containing gas is stopped, the supply of the reducing gas is stopped. In other words, there is a timing for supplying the oxygen-containing gas and the reducing gas in parallel. Then, the pressure in the processing chamber 201 at the timing of supplying the oxygen-containing gas and the reducing gas in parallel is higher than the pressure in the processing chamber 201 at the timing of supplying only the reducing gas without parallel supply. do.
- the effect of decomposing the metal-containing gas can be enhanced. Further, by stopping the supply of the reducing gas after stopping the supply of the oxygen-containing gas, oxygen atoms can be prevented from remaining in the processing chamber 201 . In addition, by having the timing of supplying the oxygen-containing gas and the reducing gas in parallel, it is possible to obtain both effects of decomposition of the metal-containing gas and suppression of oxidation of the metal-containing film. Furthermore, even in this case, the same effect as in the substrate processing step shown in FIG. 4 can be obtained.
- FIG. 9 is a diagram showing a modification of the substrate processing process shown in FIG. 4 described above.
- the above-described substrate processing step and the second metal-containing film forming step are different. That is, in this modification, the timing of starting the supply of the reducing gas in step S23 of the second metal-containing film forming step is different from the timing of starting the supply of the oxygen-containing gas, and further, the timing of ending the supply of the reducing gas is different. The timing is made different from the timing of the end of the supply of the oxygen-containing gas. Specifically, after starting the supply of the reducing gas, the supply of the oxygen-containing gas is started, and after stopping the supply of the reducing gas, the supply of the oxygen-containing gas is stopped. In other words, there is a timing for supplying the oxygen-containing gas and the reducing gas in parallel. Then, the pressure in the processing chamber 201 at the timing of supplying the oxygen-containing gas and the reducing gas in parallel is changed to Make it higher than the pressure.
- FIG. 10 is a diagram showing a modification of the substrate processing process shown in FIG. 4 described above.
- the above-described substrate processing step and the second metal-containing film forming step are different. That is, in this modification, the timing of starting the supply of the reducing gas in step S23 of the second metal-containing film forming step is different from the timing of starting the supply of the oxygen-containing gas. , the timing of the end of the supply of the oxygen-containing gas is made different. Specifically, after starting the supply of the oxygen-containing gas, the supply of the reducing gas is started, and after stopping the supply of the oxygen-containing gas, the supply of the reducing gas is stopped. In other words, there is a timing for supplying the oxygen-containing gas and the reducing gas in parallel. Then, the pressure in the processing chamber 201 at the timing of supplying the oxygen-containing gas and the reducing gas in parallel is changed to Make it higher than the pressure.
- the effect of decomposing the metal-containing gas can be enhanced. Further, by stopping the supply of the reducing gas after stopping the supply of the oxygen-containing gas, oxygen atoms can be prevented from remaining in the processing chamber 201 . In addition, by having the timing of supplying the oxygen-containing gas and the reducing gas in parallel, it is possible to obtain both effects of decomposition of the metal-containing gas and suppression of oxidation of the metal-containing film. Furthermore, even in this case, the same effect as in the substrate processing step shown in FIG. 4 can be obtained.
- FIG. 11 is a diagram showing a modification of the substrate processing process shown in FIG. 4 described above.
- the order of gas supply differs between the above-described substrate processing step and the first metal-containing film forming step. That is, in the first metal-containing film forming step, the supply of the reducing gas in step S13 is started. That is, the reducing gas is supplied in step S13 before the metal-containing gas is supplied in step S11.
- Halogen-containing gas may be adsorbed on the wafer 200 after the pretreatment process.
- the halogen element adsorbed on the wafer 200 can be removed.
- the H 2 gas reacts with Cl adsorbed on the wafer 200 to remove Cl from the wafer 200 . Separated, they are discharged from the processing chamber 201 as reaction by-products such as hydrogen chloride (HCl) and chlorine (Cl 2 ).
- the surface of the metal-containing film 300 can be terminated with H by starting the supply of the reducing gas after the pretreatment step, and the metal-containing film 300 can be oxidized. can be suppressed. This is effective even if the pretreatment step is not performed.
- H 2 gas when H 2 gas is used as the reducing gas, the H 2 gas reacts with O adsorbed on the wafer 200 to desorb O from the wafer 200 to form water vapor (H 2 O ) and other reaction by-products discharged from the processing chamber 201 and adsorbed onto the wafer 200 can be removed, and oxidation of the metal-containing film 300 as the underlying film can be suppressed. Furthermore, even in this case, the same effect as in the substrate processing step shown in FIG. 4 can be obtained.
- FIG. 12 is a diagram showing a modification of the substrate processing process shown in FIG. 4 described above.
- the substrate processing step and the pretreatment step shown in FIG. 4 are different.
- supply of halogen-containing gas in step S1 and removal of residual gas (exhaust) in step S2 are repeated a predetermined number of times. That is, cyclic processing is performed.
- the same effect as the substrate processing step shown in FIG. 4 described above can be obtained, and the residual reaction by-products can be suppressed, and the discharge of the reaction by-products can be promoted.
- FIG. 13 is a diagram showing a modification of the substrate processing process shown in FIG. 4 described above.
- the film type is not particularly limited in the present disclosure.
- a substrate processing apparatus which is a batch-type vertical apparatus that processes a plurality of substrates at once.
- the present invention can be suitably applied to film formation using a single substrate processing apparatus for processing one or several substrates.
- Recipes programs that describe processing procedures, processing conditions, etc.
- the CPU 121a appropriately selects an appropriate recipe from among the plurality of recipes stored in the storage device 121c according to the processing content.
- a single substrate processing apparatus can form films having various film types, composition ratios, film qualities, and film thicknesses with good reproducibility.
- the process recipe described above is not limited to the case of newly creating it, but may be prepared by modifying an existing recipe that has already been installed in the substrate processing apparatus, for example.
- the changed recipe may be installed in the substrate processing apparatus via an electric communication line or a recording medium recording the recipe.
- an existing recipe already installed in the substrate processing apparatus may be directly changed by operating the input/output device 122 provided in the existing substrate processing apparatus.
- controller 200 wafer (substrate) 201 processing chamber
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Abstract
Description
(a)金属含有膜が形成された基板に対して、金属元素を含有する金属含有ガスを供給する工程と、
(b)前記基板に対して還元ガスを供給する工程と、
(c)前記基板に対して酸素原子を含有する酸素含有ガスと前記還元ガスを供給する工程と、
(d)(a)と(b)とを含むサイクルを第1の回数繰り返す工程と、
(e)(d)の後、(a)と(c)とを含むサイクルを第2の回数繰り返す工程と、
を有する技術が提供される。
基板処理装置10は、加熱手段(加熱機構、加熱系)としてのヒータ207が設けられた処理炉202を備える。ヒータ207は円筒形状であり、保持板としてのヒータベース(図示せず)に支持されることにより垂直に据え付けられている。
半導体装置(デバイス)の製造工程の一工程として、下地膜としての金属元素を含有する金属含有膜300が形成されたウエハ200上に、金属元素を含有する金属含有膜600を形成する工程の一例について、図4を用いて説明する。金属含有膜300が形成されたウエハ200上に金属含有膜600を形成する工程は、上述した基板処理装置10の処理炉202を用いて実行される。以下の説明において、基板処理装置10を構成する各部の動作はコントローラ121により制御される。
(a)金属含有膜が形成されたウエハ200に対して、金属元素を含有する金属含有ガスを供給する工程と、
(b)ウエハ200に対して還元ガスを供給する工程と、
(c)ウエハ200に対して酸素原子を含有する酸素含有ガスと前記還元ガスを供給する工程と、
(d)(a)と(b)とを含むサイクルを第1の回数繰り返す工程と、
(e)(d)の後、(a)と(c)とを含むサイクルを第2の回数繰り返す工程と、
を有する。
複数枚のウエハ200がボート217に装填(ウエハチャージ)されると、図1に示されているように、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内に搬入(ボートロード)され、処理容器に収容される。この状態で、シールキャップ219はOリング220を介してアウタチューブ203の下端開口を閉塞した状態となる。
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によって真空排気される。この際、処理室201内の圧力は、圧力センサ245で測定され、この測定された圧力情報に基づき、APCバルブ243がフィードバック制御される(圧力調整)。真空ポンプ246は、少なくともウエハ200に対する処理が完了するまでの間は常時作動させた状態を維持する。
(ハロゲン含有ガス供給、ステップS1)
バルブ344を開き、ガス供給管340内にハロゲン含有ガスを流す。ハロゲン含有ガスは、MFC342により流量調整され、ノズル440のガス供給孔440aから処理室201内に供給され、排気管231から排気される。このとき、ウエハ200に対してハロゲン含有ガスが供給される。このとき同時にバルブ544を開き、ガス供給管540内に不活性ガスを流す。ガス供給管540内を流れた不活性ガスは、MFC542により流量調整され、ハロゲン含有ガスと一緒に処理室201内に供給され、排気管231から排気される。このとき、ノズル410,420,430内へのハロゲン含有ガスの侵入を防止するために、バルブ514,524,534を開き、ガス供給管510,520,530内に不活性ガスを流す。不活性ガスは、ガス供給管310,320,330、ノズル410,420,430を介して処理室201内に供給され、排気管231から排気される。
ハロゲン含有ガスの供給を開始してから所定時間経過後であって例えば1~600秒後に、ガス供給管340のバルブ344を閉じて、ハロゲン含有ガスの供給を停止する。つまり、ハロゲン含有ガスをウエハ200に対して供給する時間は、例えば1~600秒とする。このとき排気管231のAPCバルブ243は開いたままとして、真空ポンプ246により処理室201内を真空排気し、処理室201内に残留する未反応もしくは金属酸化膜500のエッチングに寄与した後のハロゲン含有ガスを処理室201内から排除(ウエハ200が存在する空間を排気)する。すなわち、処理室201内をパージする。このときバルブ514,524,534,544は開いたままとして、不活性ガスの処理室201内への供給を維持する。不活性ガスはパージガスとして作用し、処理室201内に残留する未反応もしくはエッチングに寄与した後のハロゲン含有ガスを処理室201内から排除する効果を高めることができる。
[第1の金属含有膜形成工程]
(金属含有ガス供給、ステップS11)
バルブ314を開き、ガス供給管310内に、原料ガスである金属含有ガスを流す。金属含有ガスは、MFC312により流量調整され、ノズル410のガス供給孔410aから処理室201内に供給され、排気管231から排気される。このとき同時にバルブ514を開き、ガス供給管510内に不活性ガスを流す。ガス供給管510内を流れた不活性ガスは、MFC512により流量調整され、金属含有ガスと一緒に処理室201内に供給され、排気管231から排気される。このとき、ノズル420,430,440内への金属含有ガスの侵入を防止するために、バルブ524,534,544を開き、ガス供給管520,530,540内に不活性ガスを流す。不活性ガスは、ガス供給管320,330,340、ノズル420,430,440を介して処理室201内に供給され、排気管231から排気される。
金属含有ガスの供給を開始してから所定時間経過後であって例えば1~120秒後に、ガス供給管310のバルブ314を閉じて、金属含有ガスの供給を停止する。つまり、金属含有ガスをウエハ200に対して供給する時間は、例えば1~120秒とする。このとき排気管231のAPCバルブ243は開いたままとして、真空ポンプ246により処理室201内を真空排気し、処理室201内に残留する未反応もしくは金属含有層形成に寄与した後の金属含有ガスを処理室201内から排除する。すなわち、処理室201内をパージする。このときバルブ514,524,534,544は開いたままとして、不活性ガスの処理室201内への供給を維持する。不活性ガスはパージガスとして作用し、処理室201内に残留する未反応もしくは金属含有層形成に寄与した後の金属含有ガスを処理室201内から排除する効果を高めることができる。
処理室201内の残留ガスを除去した後、バルブ324を開き、ガス供給管320内に、還元ガスを流す。還元ガスは、MFC322により流量調整され、ノズル420のガス供給孔420aから処理室201内に供給され、排気管231から排気される。このときウエハ200に対して、還元ガスが供給される。このとき同時にバルブ524を開き、ガス供給管520内に不活性ガスを流す。ガス供給管520内を流れた不活性ガスは、MFC522により流量調整される。不活性ガスは還元ガスと一緒に処理室201内に供給され、排気管231から排気される。このとき、ノズル410,430,440内への還元ガスの侵入を防止するために、バルブ514,534,544を開き、ガス供給管510,530,540内に不活性ガスを流す。不活性ガスは、ガス供給管310,330,340、ノズル410,430,440を介して処理室201内に供給され、排気管231から排気される。
金属含有層を形成した後、バルブ324を閉じて、還元ガスの供給を停止する。そして、上述したステップS12と同様の処理手順により、処理室201内に残留する未反応もしくは金属含有層の形成に寄与した後の還元ガスや反応副生成物を処理室201内から排除する。すなわち、処理室201内をパージする。
上記したステップS11~ステップS14を順に行うサイクルを少なくとも1回以上(第1の回数(所定回数)(n回))行うことにより、図5(C)に示すように、ウエハ(表面の絶縁膜400、凹部400a内、すなわち凹部400a内の金属含有膜300)上に、所定の厚さの第1の金属含有膜600aを形成する。上述のサイクルは、複数回繰り返すのが好ましい。これにより、金属含有膜300の表面酸化層の量を低減し、界面の酸化層の成長が抑制された第1の金属含有膜600aを形成することができる。
(金属含有ガス供給、ステップS21)
バルブ314を開き、ガス供給管310内に金属含有ガスを流す。なお、本ステップで用いられる金属含有ガスは、上述の第1の金属含有膜形成工程で用いられた金属含有ガスと同じガスであってもよいし、異なる種類の金属含有ガスであってもよい。金属含有ガスは、MFC312により流量調整され、ノズル410のガス供給孔410aから処理室201内に供給され、排気管231から排気される。このとき、ウエハ200に対して金属含有ガスが供給される。このとき同時にバルブ514を開き、ガス供給管510内に不活性ガスを流す。ガス供給管510内を流れた不活性ガスは、MFC512により流量調整され、金属含有ガスと一緒に処理室201内に供給され、排気管231から排気される。このとき、ノズル420,430,440内への金属含有ガスの侵入を防止するために、バルブ524,523,544を開き、ガス供給管520,530,540内に不活性ガスを流す。不活性ガスは、ガス供給管320,330,340、ノズル420,430,440を介して処理室201内に供給され、排気管231から排気される。
金属含有ガスの供給を開始してから所定時間経過後であって例えば1~120秒後に、ガス供給管310のバルブ314を閉じて、金属含有ガスの供給を停止する。そして、上述したステップS12と同様の処理手順により、処理室201内に残留する未反応もしくは金属含有層形成に寄与した後の金属含有ガスや反応副生成物を処理室201内から排除する。すなわち、処理室201内をパージする。
処理室201内の残留ガスを除去した後、バルブ324,334を開き、ガス供給管320内に還元ガスを、ガス供給管330内に微量の酸素含有ガスを流す。なお、第2の金属含有膜形成工程で用いられる還元ガスは、上述の第1の金属含有膜形成工程で用いられた還元ガスと同じガスであってもよいし、異なる種類の還元ガスであってもよい。還元ガスは、MFC322により流量調整され、ノズル420のガス供給孔420aから処理室201内に供給され、排気管231から排気される。酸素含有ガスは、MFC332により流量調整され、ノズル430のガス供給孔430aから処理室201内に供給され、排気管231から排気される。このときウエハ200に対して、還元ガスと酸素含有ガスが同時に供給される。すなわち、還元ガスの供給開始と同時に、酸素含有ガスの供給を開始する。このときさらに同時にバルブ524,534を開き、ガス供給管520,530内にそれぞれ不活性ガスを流す。ガス供給管520,530内を流れた不活性ガスは、MFC522,532により流量調整される。不活性ガスは還元ガス、酸素含有ガスとそれぞれ一緒に処理室201内に供給され、排気管231から排気される。このとき、ノズル410,440内への還元ガスと酸素含有ガスの侵入を防止するために、バルブ514,544を開き、ガス供給管510,540内に不活性ガスを流す。不活性ガスは、ガス供給管310,340、ノズル410,440を介して処理室201内に供給され、排気管231から排気される。
次に、バルブ324,334を閉じて、還元ガスと酸素含有ガスの供給を同時に停止する。すなわち、還元ガスの供給停止のタイミングと、酸素含有ガスの供給停止のタイミングを同時にする。このように還元ガスの供給停止と同時に、酸素含有ガスの供給を停止することにより、酸素原子を還元ガスにより還元して排気することが可能となり、第1の金属含有膜600aの酸化を抑制することができる。そして、上述したステップS12と同様の処理手順により、処理室201内に残留する未反応もしくは金属含有層の形成に寄与した後の還元ガスや酸素含有ガスや反応副生成物を処理室201内から排除する。すなわち、処理室201内をパージする。
すなわち、上記した第1の金属含有膜形成工程の後、ステップS21~ステップS24を順に行うサイクルを少なくとも1回以上(第2の回数(m回))行うことにより、図5(D)に示すように、ウエハ200上に形成された第1の金属含有膜600a上に、所定の厚さの第2の金属含有膜600bを形成し、金属含有膜600に改質される。すなわち、図5(E)に示すように、金属含有膜300上に、金属含有膜600を形成することができる。上述のサイクルは、複数回繰り返すのが好ましい。
ガス供給管510~540のそれぞれから不活性ガスを処理室201内へ供給し、排気管231から排気する。不活性ガスはパージガスとして作用し、これにより処理室201内が不活性ガスでパージされ、処理室201内に残留するガスや反応副生成物が処理室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が下降されて、アウタチューブ203の下端が開口される。そして、処理済ウエハ200がボート217に支持された状態でアウタチューブ203の下端からアウタチューブ203の外部に搬出(ボートアンロード)される。その後、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)。
本実施形態によれば、以下に示す1つまたは複数の効果を得ることができる。
(a)第1の金属含有膜形成工程により、金属含有膜300上の界面の酸化層の成長が抑制された金属含有膜を形成することができる。
(b)第2の金属含有膜形成工程により、金属含有ガス中の有機リガンドを除去することができ、金属含有ガスの分解促進により、膜中の不純物が低減された金属含有膜を形成することが可能となる。また、金属含有ガスの分解促進により、成膜速度を向上させることができ、生産性を向上させることができる。
(c)そして、第1の金属含有膜形成工程におけるサイクル数(第1の金属含有膜600aの膜厚)と第2の金属含有膜形成工程におけるサイクル数(第2の金属含有膜600bの膜厚)を適正化することにより酸化層の抑制と、膜中の不純物の低減と、が両立して改善される金属含有膜600を形成することができる。
(d)また、成膜工程の前に、プレトリートメント工程を行うことにより、金属含有膜300と凹部400a内に埋め込まれた金属含有膜600との間のコンタクト抵抗を低減することができる。
以上、本開示の実施形態を具体的に説明した。しかしながら、本開示は上述の実施形態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。なお、以下の変形例では、上述した実施形態と異なる点のみ詳述する。
図6は、上述した図4に示す基板処理工程の変形例を示す図である。
図7は、上述した図4に示す基板処理工程の変形例を示す図である。
図8は、上述した図4に示す基板処理工程の変形例を示す図である。
図9は、上述した図4に示す基板処理工程の変形例を示す図である。
図10は、上述した図4に示す基板処理工程の変形例を示す図である。
図11は、上述した図4に示す基板処理工程の変形例を示す図である。
図12は、上述した図4に示す基板処理工程の変形例を示す図である。
図13は、上述した図4に示す基板処理工程の変形例を示す図である。
121 コントローラ
200 ウエハ(基板)
201 処理室
Claims (31)
- (a)金属含有膜が形成された基板に対して、金属元素を含有する金属含有ガスを供給する工程と、
(b)前記基板に対して還元ガスを供給する工程と、
(c)前記基板に対して酸素原子を含有する酸素含有ガスと前記還元ガスを供給する工程と、
(d)(a)と(b)とを含むサイクルを第1の回数繰り返す工程と、
(e)(d)の後、(a)と(c)とを含むサイクルを第2の回数繰り返す工程と、
を有する半導体装置の製造方法。 - (c)では、前記還元ガスの供給開始のタイミングと、前記酸素含有ガスの供給開始のタイミングを異ならせる請求項1記載の半導体装置の製造方法。
- (c)では、前記還元ガスの供給を開始した後に、前記酸素含有ガスの供給を開始する請求項1又は2記載の半導体装置の製造方法。
- (c)では、前記還元ガスの供給開始と同時に、前記酸素含有ガスの供給を開始する請求項1記載の半導体装置の製造方法。
- (c)では、前記酸素含有ガスの供給を開始した後に、前記還元ガスの供給を開始する請求項1又は2記載の半導体装置の製造方法。
- (c)では、前記還元ガスの供給終了のタイミングと、前記酸素含有ガスの供給終了のタイミングを異ならせる請求項1から5のいずれか1項に記載の半導体装置の製造方法。
- (c)では、前記酸素含有ガスの供給を停止した後に、前記還元ガスの供給を停止する請求項1から6のいずれか1項に記載の半導体装置の製造方法。
- (c)では、前記酸素含有ガスの供給停止と同時に、前記還元ガスの供給を停止する請求項1から5のいずれか1項に記載の半導体装置の製造方法。
- (c)では、前記還元ガスの供給を停止した後に、前記酸素含有ガスの供給を停止する請求項1から6のいずれか1項に記載の半導体装置の製造方法。
- (c)では、前記酸素含有ガスと前記還元ガスとを並行して供給するタイミングを有する請求項1から9のいずれか1項に記載の半導体装置の製造方法。
- (d)にて行う(b)における前記基板が存在する空間の圧力を、
(e)にて行う(c)における前記基板が存在する空間の圧力よりも高くする請求項1から10のいずれか1項に記載の半導体装置の製造方法。 - (d)にて行う(b)における前記還元ガスの分圧を、
(e)にて行う(c)における前記還元ガスの分圧よりも高くする請求項1から11のいずれか1項に記載の半導体装置の製造方法。 - (d)にて行う(b)における、前記基板が存在する空間の圧力、および、前記還元ガスの分圧のうち少なくともいずれかを前記第1の回数毎に変化させる請求項1から12のいずれか1項に記載の半導体装置の製造方法。
- (d)にて行う(b)における、前記基板が存在する空間の圧力、および、前記還元ガスの分圧のうち少なくともいずれかを前記第1の回数毎に小さくする請求項1から13のいずれか1項に記載の半導体装置の製造方法。
- (d)では、(b)から開始する請求項1から14のいずれか1項に記載の半導体装置の製造方法。
- 前記金属含有膜の上に酸化膜が形成され、
(f)(d)の前に、前記基板に対してハロゲン元素を含有するハロゲン含有ガスを供給して、前記酸化膜の少なくとも一部を除去する工程を有する
請求項1から15のいずれか1項に記載の半導体装置の製造方法。 - (f)では、前記ハロゲン含有ガスの供給と、前記基板が存在する空間の排気を繰り返す請求項16に記載の半導体装置の製造方法。
- 前記ハロゲン含有ガスに含まれるハロゲン元素は、塩素である請求項16又は17記載の半導体装置の製造方法。
- 前記ハロゲン含有ガスは、さらに酸素を含むガスである請求項16から18のいずれか1項に記載の半導体装置の製造方法。
- 前記ハロゲン含有ガスは、POCl3、SOCl2、COCl2の少なくとも1つ以上を含むガスである請求項16から19のいずれか1項に記載の半導体装置の製造方法。
- 前記金属含有膜に含まれる金属元素は、遷移金属である請求項1から20のいずれか1項に記載の半導体装置の製造方法。
- 前記遷移金属は、W、Mo、Cu、Coの少なくとも1つ以上である請求項21記載の半導体装置の製造方法。
- 前記金属含有ガスは、カルボニル基を含むガスである請求項1から22のいずれか1項に記載の半導体装置の製造方法。
- 前記金属含有ガスに含まれる金属元素は、遷移金属である請求項1から23のいずれか1項に記載の半導体装置の製造方法。
- 前記金属含有ガスに含まれる金属元素は、白金族元素である請求項24記載の半導体装置の製造方法。
- 前記金属含有ガスに含まれる金属元素は、第8族元素である請求項25に記載の半導体装置の製造方法。
- 前記金属含有ガスに含まれる金属元素は、Ruである請求項26に記載の半導体装置の製造方法。
- (d)と(e)の間で、前記基板が存在する空間へのパージガスの供給と前記基板が存在する空間の排気とを繰り返す工程を有する請求項1から27のいずれか1項に記載の半導体装置の製造方法。
- (a)金属含有膜が形成された基板に対して、金属元素を含有する金属含有ガスを供給する工程と、
(b)前記基板に対して還元ガスを供給する工程と、
(c)前記基板に対して酸素原子を含有する酸素含有ガスと前記還元ガスを供給する工程と、
(d)(a)と(b)とを含むサイクルを第1の回数繰り返す工程と、
(e)(d)の後、(a)と(c)とを含むサイクルを第2の回数繰り返す工程と、
を有する基板処理方法。 - 処理容器と、
前記処理容器内に金属元素を含有する金属含有ガスを供給する金属含有ガス供給系と、
前記処理容器内に還元ガスを供給する還元ガス供給系と、
前記処理容器内に酸素原子を含有する酸素含有ガスを供給する酸素含有ガス供給系と、
(a)前記処理容器内の金属含有膜が形成された基板に対して、前記金属含有ガスを供給する処理と、
(b)前記基板に対して前記還元ガスを供給する処理と、
(c)前記基板に対して前記酸素含有ガスと前記還元ガスを供給する処理と、
(d)(a)と(b)とを含むサイクルを第1の回数繰り返す処理と、
(e)(d)の後、(a)と(c)とを含むサイクルを第2の回数繰り返す処理と、
を行わせるように、前記金属含有ガス供給系、前記還元ガス供給系及び前記酸素含有ガス供給系を制御することが可能なように構成される制御部と、
を有する基板処理装置。 - (a)金属含有膜が形成された基板に対して、金属元素を含有する金属含有ガスを供給する手順と、
(b)前記基板に対して還元ガスを供給する手順と、
(c)前記基板に対して酸素原子を含有する酸素含有ガスと前記還元ガスを供給する手順と、
(d)(a)と(b)とを含むサイクルを第1の回数繰り返す手順と、
(e)(d)の後、(a)と(c)とを含むサイクルを第2の回数繰り返す手順と、
をコンピュータにより基板処理装置に実行させるプログラムが記録されたコンピュータ読み取り可能な記録媒体。
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TW202318538A (zh) | 2023-05-01 |
KR20240056552A (ko) | 2024-04-30 |
JPWO2023073924A1 (ja) | 2023-05-04 |
CN117981052A (zh) | 2024-05-03 |
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