WO2021187112A1 - クリーニング方法及び半導体装置の製造方法 - Google Patents
クリーニング方法及び半導体装置の製造方法 Download PDFInfo
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- WO2021187112A1 WO2021187112A1 PCT/JP2021/008201 JP2021008201W WO2021187112A1 WO 2021187112 A1 WO2021187112 A1 WO 2021187112A1 JP 2021008201 W JP2021008201 W JP 2021008201W WO 2021187112 A1 WO2021187112 A1 WO 2021187112A1
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- electrostatic chuck
- plasma
- gas
- cleaning method
- cleaning
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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
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/4401—Means for minimising impurities, e.g. dust, moisture or residual gas, in the reaction chamber
- C23C16/4405—Cleaning of reactor or parts inside the reactor by using reactive gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0035—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like
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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
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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
- C23C16/08—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 halides
- C23C16/14—Deposition of only one other metal element
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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
- C23C16/44—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
- C23C16/458—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber
- C23C16/4582—Rigid and flat substrates, e.g. plates or discs
- C23C16/4583—Rigid and flat substrates, e.g. plates or discs the substrate being supported substantially horizontally
- C23C16/4586—Elements in the interior of the support, e.g. electrodes, heating or cooling devices
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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
- C23C16/44—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
- C23C16/50—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 using electric discharges
- C23C16/505—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 using electric discharges using radio frequency discharges
- C23C16/509—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 using electric discharges using radio frequency discharges using internal electrodes
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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
- C23C16/44—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
- C23C16/50—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 using electric discharges
- C23C16/505—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 using electric discharges using radio frequency discharges
- C23C16/509—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 using electric discharges using radio frequency discharges using internal electrodes
- C23C16/5096—Flat-bed apparatus
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32082—Radio frequency generated discharge
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32082—Radio frequency generated discharge
- H01J37/32091—Radio frequency generated discharge the radio frequency energy being capacitively coupled to the plasma
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32082—Radio frequency generated discharge
- H01J37/32174—Circuits specially adapted for controlling the RF discharge
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/32715—Workpiece holder
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/32798—Further details of plasma apparatus not provided for in groups H01J37/3244 - H01J37/32788; special provisions for cleaning or maintenance of the apparatus
- H01J37/32853—Hygiene
- H01J37/32862—In situ cleaning of vessels and/or internal parts
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- H10P14/412—
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- H10P50/242—
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- H10P72/70—
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- H10P72/72—
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- H10P72/722—
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/20—Positioning, supporting, modifying or maintaining the physical state of objects being observed or treated
- H01J2237/2007—Holding mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/32—Processing objects by plasma generation
- H01J2237/33—Processing objects by plasma generation characterised by the type of processing
- H01J2237/332—Coating
- H01J2237/3321—CVD [Chemical Vapor Deposition]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/32—Processing objects by plasma generation
- H01J2237/33—Processing objects by plasma generation characterised by the type of processing
- H01J2237/335—Cleaning
Definitions
- This disclosure relates to a cleaning method and a method for manufacturing a semiconductor device.
- the present disclosure provides a technique capable of removing deposits adhering to the electrostatic chuck while suppressing damage to the surface of the electrostatic chuck.
- the electrostatic chuck is exposed to plasma, and the relationship between the potential of the electrostatic chuck and the potential of the plasma is maintained so that an electron current flows from the plasma toward the electrostatic chuck. This cleans the electrostatic chuck.
- Schematic diagram showing an example of the film forming apparatus of the embodiment A flowchart showing an example of a method for manufacturing a semiconductor device according to an embodiment.
- FIG. 1 is a schematic view showing an example of the film forming apparatus of the embodiment.
- the film forming apparatus is a plasma CVD apparatus that forms a titanium (Ti) film on a substrate by plasma CVD (Plasma-Enhanced Chemical Vapor Deposition) will be described as an example.
- the film forming apparatus 1 includes a processing chamber 11 composed of an airtightly configured substantially cylindrical processing container.
- a stage 12 for horizontally adsorbing and holding a semiconductor wafer (hereinafter referred to as “wafer W”), which is an example of a substrate, is supported by a substantially cylindrical support member 13 provided at a lower center thereof. It is arranged in the state that it is.
- the stage 12 is formed of conductive ceramics such as aluminum nitride (AlN).
- a guide ring 14 for guiding the wafer W is provided on the outer edge of the stage 12.
- a heater 15 is embedded in the stage 12.
- the heater 15 heats the wafer W to a predetermined temperature by supplying power from the heater power supply 40.
- the heater power supply 40 includes an AC power supply 40a, a thyristor 40b, and a noise filter (NF) 40c.
- the lower electrode 16 is embedded on the heater 15.
- a chuck control mechanism 70 which will be described later, is connected to the lower electrode 16, and the stage 12 and the lower electrode 16 function as an electrostatic chuck.
- the electrostatic chuck is a Johnson-Rahbek type (JR type: Johnson-Rahbek type).
- a shower head 20 is provided on the top wall 11A of the processing chamber 11 via an insulating member 19.
- the shower head 20 includes an upper base member 21 and a shower plate 22 attached below the base member 21.
- a heater 23 for heating the shower head 20 is embedded in the base member 21. The heater 23 heats the shower head 20 to a predetermined temperature by supplying power from the heater power supply 41.
- the shower plate 22 is formed with a large number of discharge holes 24 for discharging gas in the processing chamber 11. Each discharge hole 24 communicates with a gas diffusion space 25 formed between the base member 21 and the shower plate 22.
- a gas introduction port 26 for supplying the processing gas to the gas diffusion space 25 is provided in the central portion of the base member 21. The gas introduction port 26 is connected to a mixed gas supply line 38 of the gas supply unit 30 described later.
- Gas supply unit 30 the TiCl 4 gas H 2 gas supply source for supplying the H 2 gas is Ar gas supply source 32 and the reducing gas supplying TiCl 4 gas supply source 31, an Ar gas supplies a Ti compound gas Includes 33.
- the gas supply source 31 is connected to the TiCl 4 gas supply line 31L
- the Ar gas supply source 32 is connected to an Ar gas supply line 32L
- H 2 gas supplied to the H 2 gas supply source 33 Line 33L is connected.
- Each gas line 31L to 33L is provided with two valves 31V to 33V with a mass flow controller (MFC) 31C to 33C and a mass flow controller 31C to 33C interposed therebetween.
- MFC mass flow controller
- the gas mixing unit 37 has a function of mixing the above process gas and supplying it to the shower head 20.
- the TiCl 4 gas supply source 31, the Ar gas supply source 32, and the H 2 gas supply source 33 are connected to the gas mixing unit 37 on the side where the gas flows in via the gas lines 31L to 33L.
- a shower head 20 is connected to the gas outflow side of the gas mixing unit 37 via a mixed gas supply line 38.
- one kind of gas selected from TiCl 4 gas, Ar gas and H 2 gas or a mixed gas of a plurality of gases is passed through the gas introduction port 26 of the shower head 20 and the gas diffusion space 25. It is introduced into the processing chamber 11 from a plurality of discharge holes 24.
- the shower head 20 is configured as a so-called premix type in which the process gas is mixed in advance and supplied into the processing chamber 11, but each process gas is independently supplied into the processing chamber 11. It may be composed of the post-mix type to be supplied.
- a high frequency power supply 43 is connected to the shower head 20 via a matching device 42. With the process gas supplied into the processing chamber 11, plasma is generated between the shower head 20 and the lower electrode 16 by supplying high-frequency power of, for example, 450 kHz from the high-frequency power supply 43 to the shower head 20. In this way, the shower head 20 functions as an upper electrode arranged to face the lower electrode.
- the distance between the upper surface of the stage 12 and the lower surface of the shower plate 22 (distance between the pair of electrodes) is 80 mm or less from the viewpoint that electrons can be efficiently drawn to the electrostatic chuck side in the cleaning process described later. Is preferable.
- the high frequency power is not limited to 450 kHz, and can be appropriately used, for example, 2 MHz, 13.56 MHz, 27 MHz, 60 MHz, 100 MHz.
- a circular opening 17 is formed in the central portion of the bottom wall 11B of the processing chamber 11, and the bottom wall 11B is provided with an exhaust chamber 50 projecting downward so as to cover the opening 17.
- An exhaust pipe 51 is connected to the side surface of the exhaust chamber 50, and an exhaust device 52 is connected to the exhaust pipe 51.
- the exhaust device 52 decompresses the inside of the processing chamber 11 to a predetermined vacuum pressure.
- the stage 12 is provided with a plurality of (for example, three) elevating pins 60 for supporting and elevating the wafer W so as to be retractable with respect to the surface of the stage 12.
- the elevating pin 60 is fixed to the support plate 61.
- the elevating pin 60 is elevated and lowered via the support plate 61 by a drive mechanism 62 such as an air cylinder.
- the side wall 11C of the processing chamber 11 is provided with a carry-in outlet 18 for carrying in and out the wafer W and a gate valve G for opening and closing the carry-in outlet 18.
- the lifting pin 60 raises and lowers the wafer W when it is carried in and out of the processing chamber 11. Specifically, when the wafer W is carried into the processing chamber 11, the elevating pin 60 is raised. Then, the wafer W is carried in from the carry-in outlet 18 by a transport arm (not shown) and placed on the elevating pin 60. Next, the elevating pin 60 is lowered to place the wafer W on the stage 12. Further, when the wafer W is carried out from the processing chamber 11, the elevating pin 60 is raised to lift the wafer W. Then, the wafer W is received by the transfer arm (not shown) and is carried out from the carry-in / out port 18.
- the film forming apparatus 1 has a control unit 90.
- the control unit 90 controls the operation of each unit of the film forming apparatus 1.
- the control unit 90 is, for example, a computer.
- the control unit 90 includes a data processing unit including a program, a memory, and a CPU.
- the program incorporates an instruction (each step) to send a control signal from the control unit 90 to each unit of the film forming apparatus 1 to execute a cleaning method of the electrostatic chuck described later.
- the program is stored in a storage medium such as a flash memory, a hard disk, or an optical disk, and installed in the control unit 90.
- the chuck control mechanism 70 is electrically connected to the lower electrode 16.
- the chuck control mechanism 70 includes a power supply 71, a ground box 72, a variable impedance device 73, and a current sensor 74.
- the power supply 71 applies an anode voltage to the stage 12 via the lower electrode 16.
- the power supply 71 is a high voltage (HV) power supply, and a high voltage of, for example, 400 to 600 V is applied to the stage 12 via the lower electrode 16.
- HV high voltage
- the power supply 71 may include an RF filter (not shown) that blocks high-frequency power flowing from the stage 12 side to the power supply 71.
- the grounding box 72 is provided between the power supply 71 and the lower electrode 16.
- the grounding box 72 is configured to be able to switch between a state in which the lower electrode 16 is grounded and a state in which the lower electrode 16 is not grounded.
- the grounding box 72 includes a switch 72a and a switch 72b.
- the switch 72a switches the state of the electrical connection between the power supply 71 and the lower electrode 16. By turning on the switch 72a, the power supply 71 and the lower electrode 16 are electrically connected, and by turning off the switch 72a, the electrical connection between the power supply 71 and the lower electrode 16 is cut off.
- the switch 72b switches the grounded state of the lower electrode 16.
- the lower electrode 16 is grounded by turning on the switch 72b.
- the variable impedance device 73 is provided between the power supply 71 and the grounding box 72.
- the variable impedance device 73 adjusts the impedance on the stage 12 side.
- the variable impedance device 73 includes a capacitor 73a and a variable coil 73b connected in series, and adjusts the impedance on the stage 12 side by adjusting the inductance of the variable coil 73b.
- the variable impedance device 73 includes a current sensor 73c.
- the current sensor 73c is, for example, an AC current sensor such as a CT (Current Transformer) type current sensor.
- the current sensor 74 detects the current flowing from the lower electrode 16 toward the power supply 71. In other words, the current sensor 74 detects the electron current flowing from the plasma space toward the electrostatic chuck.
- the current sensor 74 is an AC current sensor such as a CT type current sensor.
- FIG. 2 is a flowchart showing an example of a method for manufacturing a semiconductor device according to the embodiment. In the following description, it is assumed that the inside of the processing chamber 11 is created in a vacuum atmosphere by the exhaust device 52 at the start of the method for manufacturing the semiconductor device.
- the control unit 90 carries the wafer W into the processing chamber 11 (step S1).
- the control unit 90 carries the wafer W into the processing chamber 11 by a transport arm (not shown), delivers the wafer W to the elevating pin 60, and places the wafer W on the stage 12.
- the control unit 90 closes the gate valve G.
- the control unit 90 controls the exhaust device 52 to reduce the pressure in the processing chamber 11 to a predetermined pressure.
- the control unit 90 controls the AC power supply 40a and the heater power supply 41 to heat the stage 12 and the shower head 20 to a predetermined temperature.
- control unit 90 executes a film forming process on the wafer W adsorbed and held on the stage 12 (step S2).
- the control unit 90 controls the gas supply unit 30 to supply the TiCl 4 gas and the H 2 gas into the processing chamber 11. Further, the control unit 90 controls the power supply 71 and the grounding box 72 to apply a voltage to the lower electrode 16 and supply high frequency power of a predetermined frequency to the shower head 20 by the high frequency power supply 43.
- the wafer W is adsorbed and held on the stage 12 (electrostatic chuck), plasma is generated between the electrostatic chuck and the shower head 20, and the TiCl 4 gas and the H 2 gas react with each other on the wafer W. A Ti film is formed on the surface.
- the control unit 90 carries out the wafer W on which the Ti film is formed from the processing chamber 11 (step S3).
- the control unit 90 controls the grounding box 72 to ground the lower electrode 16 to release the adsorption of the wafer W to the stage 12.
- the control unit 90 opens the gate valve G.
- the wafer W in the processing chamber 11 is carried out by a transfer arm (not shown).
- control unit 90 determines whether or not the electrostatic chuck needs to be cleaned (step S4). Whether or not the electrostatic chuck needs to be cleaned is determined based on, for example, the number of times and the time during which the film forming process is executed.
- step S4 If it is determined in step S4 that cleaning of the electrostatic chuck is not necessary, the control unit 90 returns the process to step S1. That is, the control unit 90 carries the wafer W to be processed next into the processing chamber 11 and executes the film forming process without executing the cleaning process of the electrostatic chuck.
- step S5 when it is determined in step S4 that the electrostatic chuck needs to be cleaned, the control unit 90 executes a cleaning process (cleaning method) on the electrostatic chuck (step S5).
- cleaning process the electrostatic chuck is exposed to plasma without the wafer W on the electrostatic chuck, and an electron current flows from the plasma toward the electrostatic chuck to determine the relationship between the potential of the electrostatic chuck and the potential of the plasma. Clean the electrostatic chuck by keeping the relationship.
- the control unit 90 switches the switch 72a on and the switch 72b off, controls the power supply 71, and applies an anode voltage of, for example, 400V to 600V to the lower electrode 16.
- control unit 90 controls the gas supply unit 30 to supply Ar gas into the processing chamber 11, and also controls the high frequency power supply 43 to supply high frequency power of, for example, 450 kHz to the shower head 20 to generate plasma. do. Further, the control unit 90 stabilizes the plasma generated between the pair of electrodes arranged to face each other by controlling the variable impedance device 73 to adjust the impedance on the side of the electrostatic chuck.
- the surface of the electrostatic chuck is positively charged (+), so that the plasma
- the electrons contained in the electrostatic chuck are drawn to the surface of the electrostatic chuck. That is, an electron current flows from the plasma toward the electrostatic chuck (lower electrode 16).
- an electron current flows from the plasma toward the electrostatic chuck (lower electrode 16).
- electron collision occurs on the surface of the electrostatic chuck, and deposits adhering to the electrostatic chuck are removed.
- collision of high-energy cations for example, Ar +
- control unit 90 ends the process.
- the electrostatic chuck is exposed to plasma, and the relationship between the potential of the electrostatic chuck and the potential of the plasma is maintained so that an electron current flows from the plasma toward the electrostatic chuck.
- electrons are drawn from the plasma space to the side of the electrostatic chuck, and the drawn electrons collide with the surface of the electrostatic chuck, so that the deposits adhering to the electrostatic chuck can be removed.
- the damage to the surface of the electrostatic chuck is less than that of the collision of cations (for example, Ar +).
- the outermost surface of the dielectric layer (for example, a sintering aid) of the electrostatic chuck is etched by the impact of the cations, and impurities such as particles are likely to be generated.
- the frequency of regeneration (repair) of the electrostatic chuck performed by removing the electrostatic chuck from the film forming apparatus 1 is reduced. It can be done and productivity is improved.
- plasma is generated in a relatively narrow space where the distance between the pair of electrodes is 80 mm or less, and the electrostatic chuck is cleaned by the plasma.
- electrons can be efficiently drawn to the side of the electrostatic chuck, so that the ability to remove deposits on the electrostatic chuck is enhanced.
- the impedance of the electrostatic chuck can be adjusted by using a variable impedance device connected to the electrostatic chuck. As a result, even when the anode voltage applied to the lower electrode 16 is changed, the impedance on the electrostatic chuck side can be adjusted, so that stable plasma can be generated.
- the cleaning process described above was performed on the electrostatic chuck having deposits on the surface.
- the surface resistance of the electrostatic chuck was measured before and after the cleaning treatment.
- the cleaning treatment conditions and the surface resistance measurement conditions are as follows.
- Table 1 shows the results of comparing the surface resistance of the electrostatic chuck before and after the cleaning process.
- the measurement positions mean different positions in the plane of the electrostatic chuck.
- the surface resistance of the electrostatic chuck before the cleaning process is 2.8 M ⁇ to 132 M ⁇ , whereas the surface resistance of the electrostatic chuck after the cleaning process is the upper limit of measurement. It can be seen that it is (2 T ⁇ ) or more. From this result, it is considered that by performing the above-mentioned cleaning process on the electrostatic chuck, the deposits on the electrostatic chuck were removed and the surface resistance of the electrostatic chuck was increased.
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Abstract
Description
図1を参照し、実施形態の成膜装置の一例について説明する。図1は、実施形態の成膜装置の一例を示す概略図である。以下の実施形態では、成膜装置がプラズマCVD(PECVD:Plasma-Enhanced Chemical Vapor Deposition)によって基板上にチタン(Ti)膜を形成するプラズマCVD装置である場合を例示して説明する。
チャック制御機構70は、下部電極16と電気的に接続されている。チャック制御機構70は、電源71、接地箱72、可変インピーダンス装置73及び電流センサ74を含む。
図2を参照し、実施形態のクリーニング方法を含む半導体装置の製造方法の一例について説明する。図2は、実施形態の半導体装置の製造方法の一例を示すフローチャートである。なお、以下では、半導体装置の製造方法の開始時において、処理室11内が排気装置52により真空雰囲気とされているものとして説明する。
実施例では、前述の成膜装置1において、表面に付着物が付着した静電チャックに対して前述のクリーニング処理を実行した。また、クリーニング処理の前及び後に静電チャックの表面抵抗を測定した。なお、クリーニング処理の条件及び表面抵抗の測定条件は以下である。
一対の電極間の距離:10~50mm
高周波電源43の出力:450kHz、500W
電源71の出力:500V
処理室11内の圧力:5Torr(667Pa)
処理時間:60秒×10サイクル
(表面抵抗の測定条件)
印加電圧:1000V
16 下部電極
20 シャワーヘッド
73 可変インピーダンス装置
W ウエハ
Claims (9)
- 静電チャックをプラズマに曝し、前記静電チャックの電位と前記プラズマの電位の関係を、前記プラズマから前記静電チャックに向けて電子電流が流れ込む関係に保つことにより、静電チャックをクリーニングするクリーニング方法。
- 前記静電チャックは、ジョンソン・ラーベック型である、
請求項1に記載のクリーニング方法。 - 前記プラズマは、対向配置される一対の電極間に形成される、
請求項1又は2に記載のクリーニング方法。 - 前記一対の電極間の距離は、80mm以下である、
請求項3に記載のクリーニング方法。 - 前記一対の電極の一方に高周波電力を印加し、他方に陽極電圧を印加する、
請求項3又は4に記載のクリーニング方法。 - 前記静電チャックの上に基板がない状態で実行される、
請求項1乃至5のいずれか一項に記載のクリーニング方法。 - 前記静電チャックには、インピーダンスを調整する可変インピーダンス装置が接続されている、
請求項1乃至6のいずれか一項に記載のクリーニング方法。 - 前記静電チャックに向けて流れ込む電子電流に基づいて陽極電圧を制御する、
請求項1乃至7のいずれか一項に記載のクリーニング方法。 - 静電チャックに基板を吸着保持して成膜を行う工程と、
前記静電チャックの上に基板がない状態で前記静電チャックをプラズマに曝す工程と、
を有する半導体装置の製造方法であって、
前記プラズマに曝す工程は、前記静電チャックの電位と前記プラズマの電位との関係を、前記プラズマから前記静電チャックに向けて電子電流が流れ込む関係に保つステップを含む、
半導体装置の製造方法。
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| CN202180019248.0A CN115244214B (zh) | 2020-03-17 | 2021-03-03 | 清洁方法和半导体装置的制造方法 |
| KR1020227034659A KR102798971B1 (ko) | 2020-03-17 | 2021-03-03 | 클리닝 방법 및 반도체 장치의 제조 방법 |
| US17/906,368 US12521773B2 (en) | 2020-03-17 | 2021-03-03 | Method of cleaning electrostatic chuck and method of manufacturing semiconductor device while exposing electrostatic chuck to plasma and introducing electron current |
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| JP2020046448A JP7482657B2 (ja) | 2020-03-17 | 2020-03-17 | クリーニング方法及び半導体装置の製造方法 |
| JP2020-046448 | 2020-03-17 |
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| JP (1) | JP7482657B2 (ja) |
| KR (1) | KR102798971B1 (ja) |
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| JP2004095909A (ja) * | 2002-08-30 | 2004-03-25 | Tokyo Electron Ltd | プラズマ処理方法及びプラズマ処理装置 |
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| KR102798971B1 (ko) | 2025-04-23 |
| JP7482657B2 (ja) | 2024-05-14 |
| US20230173557A1 (en) | 2023-06-08 |
| TW202141620A (zh) | 2021-11-01 |
| CN115244214B (zh) | 2025-02-11 |
| US12521773B2 (en) | 2026-01-13 |
| JP2021147635A (ja) | 2021-09-27 |
| KR20220150373A (ko) | 2022-11-10 |
| CN115244214A (zh) | 2022-10-25 |
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