WO2007116969A1 - 処理装置及び処理方法 - Google Patents
処理装置及び処理方法 Download PDFInfo
- Publication number
- WO2007116969A1 WO2007116969A1 PCT/JP2007/057768 JP2007057768W WO2007116969A1 WO 2007116969 A1 WO2007116969 A1 WO 2007116969A1 JP 2007057768 W JP2007057768 W JP 2007057768W WO 2007116969 A1 WO2007116969 A1 WO 2007116969A1
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- WIPO (PCT)
- Prior art keywords
- gas
- processing
- flow rate
- predetermined
- container
- Prior art date
Links
- 238000012545 processing Methods 0.000 title claims abstract description 297
- 238000003672 processing method Methods 0.000 title claims description 18
- 238000000034 method Methods 0.000 claims abstract description 149
- 239000007789 gas Substances 0.000 claims description 330
- 238000002347 injection Methods 0.000 claims description 40
- 239000007924 injection Substances 0.000 claims description 40
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000004590 computer program Methods 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 4
- 238000005530 etching Methods 0.000 description 92
- 239000010408 film Substances 0.000 description 36
- 235000012431 wafers Nutrition 0.000 description 28
- 239000004065 semiconductor Substances 0.000 description 14
- 239000004020 conductor Substances 0.000 description 9
- 238000011282 treatment Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 230000006641 stabilisation Effects 0.000 description 8
- 238000011105 stabilization Methods 0.000 description 8
- 230000005855 radiation Effects 0.000 description 5
- 238000012733 comparative method Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000001020 plasma etching Methods 0.000 description 2
- 238000002230 thermal chemical vapour deposition Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000004380 ashing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 1
- 238000002294 plasma sputter deposition Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
-
- 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
- C23C16/45502—Flow conditions 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
- C23C16/45563—Gas nozzles
- C23C16/45565—Shower nozzles
-
- 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
- H01J37/3244—Gas supply means
-
- 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
- H01J37/3244—Gas supply means
- H01J37/32449—Gas control, e.g. control of the gas flow
-
- 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
- H01J37/32816—Pressure
- H01J37/32834—Exhausting
-
- 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
- H01L21/67063—Apparatus for fluid treatment for etching
-
- 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
- H01J2237/18—Vacuum control means
- H01J2237/182—Obtaining or maintaining desired pressure
- H01J2237/1825—Evacuating means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/0318—Processes
- Y10T137/0324—With control of flow by a condition or characteristic of a fluid
- Y10T137/0368—By speed of fluid
Definitions
- the present invention relates to a processing apparatus and a processing method used when performing a plasma process, a film forming process, an etching process, or the like on an object to be processed such as a semiconductor wafer, and in particular, at the start of the process.
- the present invention relates to a processing apparatus and a processing method for quickly supplying gas and switching gas types.
- a semiconductor product such as a semiconductor integrated circuit
- various processes such as a film forming process, an etching process, an oxidative diffusion process, an ashing process, and a modification process are performed on a semiconductor wafer, for example. Repeatedly applied. These various treatments have the power to improve product yield.
- semiconductor wafers are required to have higher uniformity in the wafer surface as the density and density of semiconductor products increase. In order to improve production efficiency, improvement in throughput is required.
- FIG. 6 is a schematic configuration diagram showing a conventional general plasma processing apparatus.
- the plasma processing apparatus 2 includes a processing container 4 that can be evacuated, and a mounting table 6 that is provided in the processing container 4 and on which a semiconductor wafer W is mounted. 6 is supported by an L-shaped support arm 7 extending from the side wall of the container.
- a ceiling plate 8 made of a disk-shaped aluminum nitride, quartz, or the like that transmits microwaves is airtightly provided on the ceiling facing the mounting table 6.
- a gas nozzle 9 for introducing a predetermined gas into the container is provided on the side wall of the processing container 4.
- the planar antenna member 10 is formed with a large number of microwave radiation holes 14 formed of, for example, long groove-like through holes. This my The chrominance holes 14 are generally arranged concentrically or spirally.
- the central conductor 18 of the coaxial waveguide 16 is connected to the center portion of the planar antenna member 10, and a microwave of 2.45 GHz, for example, generated from the microwave generator 20 changes to a predetermined vibration mode by mode change.
- the microwave is emitted from the microwave radiation hole 14 provided in the planar antenna member 10 while propagating radially in the radial direction of the antenna member 10 and is transmitted through the top plate 8.
- the microwave is introduced into the lower processing container 4, and plasma is formed in the processing space S in the processing container 4 by this microwave.
- an exhaust port 24 is provided in the bottom 4A of the processing container 4, and a pressure control valve 26 and first and second vacuum pumps 28 and 30 are interposed in the exhaust port 24.
- An exhaust passage 32 is connected so that the atmosphere in the processing container 4 can be evacuated.
- plasma is formed in the processing space S in the processing container 4, and plasma processing such as plasma etching or plasma deposition is performed on the semiconductor weno and W.
- a predetermined process gas is flowed into the process container 4 and the pressure control valve 26 is used to process the wafer. Perform pressure control in 4. After the pressure in the processing container 4 is stabilized at a predetermined constant pressure, the plasma is turned on to perform a predetermined process.
- the processing may be performed continuously while switching the gas type supplied to one wafer.
- Such processing is also referred to as so-called multi-step processing.
- the supply of process gas is stopped when one step process is completed.
- the residual gas in the processing container 4 is exhausted and then the processing gas for the next step processing is supplied to perform the above-described setup for pressure stabilization. Thereafter, the step process is performed.
- Patent Document 1 Japanese Patent Application Laid-Open No. 9 181052
- Patent Document 2 JP 2002-311892 A
- the pressure in the processing container 4 is stabilized due to the compressibility of the gas when performing the process processing (pressure stabilization) using the pressure control valve 26. It will always take about 10 seconds just to make it work, and during this time processing cannot be performed. It was the cause that lowered the throughput.
- the present invention has been devised to pay attention to the above problems and to effectively solve them.
- the object of the present invention is to quickly stabilize the pressure in the processing container at the start of the process, and to quickly exhaust the residual gas and stabilize the pressure in the processing container at the time of gas type switching. It is an object of the present invention to provide a processing apparatus and a processing method that can perform processing.
- the present invention provides a processing apparatus for performing a predetermined process on a target object using a processing gas having a specified flow rate, and a processing container in which a mounting table for mounting the target object is provided;
- An exhaust system having a vacuum pump and a pressure control valve for exhausting the atmosphere in the processing container, a gas injection means having a gas injection hole for injecting the processing gas into the processing container, and the gas injection means
- a gas supply means for supplying the processing gas while controlling the flow rate to the apparatus, and a control means for controlling the entire apparatus.
- the control means controls the exhaust system and the gas supply means to start the predetermined processing.
- a processing gas having a flow rate larger than the prescribed flow rate during the prescribed treatment is supplied for a prescribed short time while the atmosphere in the treatment container is exhausted by an exhaust system, and then the treatment gas having the prescribed flow rate is supplied as a gas.
- a processing apparatus according to claim to Rukoto is provided from the flow path.
- a flow larger than the specified flow rate at the time of the predetermined processing in a state where the atmosphere in the processing container is exhausted when the predetermined processing is started Since the process gas is controlled to be supplied after a predetermined amount of process gas is supplied for a predetermined short time, the pressure stabilization in the process container at the start of the process can be performed quickly.
- control means controls the exhaust system and the gas supply means, so that the volume of the processing container, the process pressure in the processing container during the predetermined processing, and the inside of the processing container
- a processing apparatus that supplies a processing gas having a flow rate larger than a specified flow rate for a predetermined short period of time determined based on the time required to increase the pressure to the process pressure. It is a position.
- the present invention is the processing apparatus characterized in that the control means controls the exhaust system and the gas supply means to supply a processing gas having a flow rate larger than the prescribed flow rate within 3 seconds.
- control means controls the exhaust system and the gas supply means to supply a processing gas having a flow rate larger than a specified flow rate, and simultaneously controls the pressure control valve to control the predetermined value.
- the processing apparatus is characterized in that a valve opening degree corresponding to the process pressure in the processing container at the time of processing is set.
- the present invention is the processing apparatus characterized in that the gas supply means supplies a plurality of types of processing gases that are selectively supplied by switching.
- the gas supply means has a gas flow path connected to the gas injection means, and a high-speed exhaust on-off valve is attached between the gas flow path and the inside of the processing container.
- a high-speed exhaust bypass passage is provided.
- the gas supply means has a gas flow path connected to the gas injection means, and a high-speed exhaust open / close valve is attached between the gas flow path and the exhaust system.
- the processing apparatus is provided with a bypass passage for high-speed exhaust.
- control means discharges the processing gas of the processing immediately before remaining in the gas flow path immediately before flowing the processing gas having a flow rate larger than the specified flow rate for a predetermined short time.
- the high-speed exhaust on-off valve is opened.
- the present invention is the processing apparatus, wherein the gas injection means is a shower head having a plurality of gas injection holes.
- the present invention is a processing apparatus characterized in that a heating means for heating the object to be processed is provided.
- the present invention is a processing apparatus characterized in that plasma forming means for forming plasma is provided in the processing container.
- the present invention provides a processing method in which a predetermined flow rate of processing gas is supplied into a processing container that is evacuated to perform a predetermined processing on an object to be processed. Processing When starting the process, a process gas having a flow rate larger than the specified flow rate during the predetermined processing is supplied for a predetermined short time while exhausting the atmosphere in the processing container by an exhaust system, and a predetermined flow rate. And a step of supplying a processing gas having a specified flow rate through a gas flow path after supplying a processing gas having a higher flow rate for a predetermined short period of time.
- the present invention is capable of selectively supplying a plurality of types of processing gas by switching into the processing container, and supplying the processing gas into the processing container by switching the processing gas.
- the processing gas at the time of the processing immediately before remaining in the gas flow path for supplying the processing gas is passed through the high-speed exhaust bypass passage in the processing container,
- the treatment method is characterized by discharging to an exhaust system.
- the present invention includes a processing container provided with a mounting table on which an object to be processed is mounted, an exhaust system having a vacuum pump and a pressure control valve for exhausting the atmosphere in the processing container, Using a processing apparatus comprising: a gas injection means having a gas injection hole for injecting a processing gas into the processing container; and a gas supply means for supplying the processing gas while controlling a flow rate to the gas injection means.
- a process of supplying gas for a predetermined short period of time, and a process of supplying a processing gas having a flow rate larger than the specified flow rate for a predetermined short time, and then supplying a processing gas having a specified flow rate from the gas flow path A processing method with A storage medium for storing a computer program for controlling the processing device to be executed.
- the present invention includes a processing container provided with a mounting table on which an object to be processed is mounted, an exhaust system having a vacuum pump and a pressure control valve for exhausting the atmosphere in the processing container, Using a processing apparatus comprising: a gas injection means having a gas injection hole for injecting a processing gas into the processing container; and a gas supply means for supplying the processing gas while controlling a flow rate to the gas injection means.
- a processing apparatus comprising: supplying a processing gas having a flow rate greater than a specified flow rate for a predetermined short time, and then supplying a processing gas having a specified flow rate from the gas flow path column.
- a processing gas having a flow rate larger than the specified flow rate during the predetermined processing is reduced to a predetermined short while the atmosphere in the processing container is exhausted when the predetermined processing is started. Since the process gas is controlled to be supplied after the supply for the specified time, the pressure stabilization in the process vessel at the start of the process can be performed quickly.
- control means is configured to open and close the high-speed exhaust gas in order to discharge the processing gas of the immediately preceding processing remaining in the gas flow path immediately before flowing a large flow rate of processing gas for a predetermined short time. Since the valve is opened for only a short time, the residual gas can be exhausted and the pressure in the processing vessel can be quickly stabilized when the gas type is switched.
- FIG. 1 is a block diagram showing an example of a processing apparatus according to the present invention.
- FIG. 2 (A), (B), and (C) are diagrams showing changes in pressure in the processing vessel.
- FIGS. 3 (A), (B), (C), (D), and (E) are diagrams showing an example of a timing chart when an etching gas that is a processing gas is switched.
- FIG. 4 is a flowchart showing each step of the method of the present invention.
- FIG. 5 is a sectional view showing a modification of the processing apparatus of the present invention.
- FIG. 6 is a schematic configuration diagram showing a conventional general plasma processing apparatus.
- FIG. 7 is a cross-sectional view showing laminated films of different film types laminated on a semiconductor wafer.
- FIG. 1 is a block diagram showing an example of a processing apparatus according to the present invention.
- a plasma processing apparatus will be described as an example of the processing apparatus.
- a plasma processing apparatus 40 as a processing apparatus has a processing container 42 whose side walls and bottom are made of a conductor such as aluminum and which is formed into a cylindrical shape as a whole.
- the inside of the processing container 42 is configured as a sealed processing space, and plasma is formed in the processing space of the processing container 42.
- the processing container 42 itself is grounded.
- a disk-shaped mounting table 44 on which, for example, a semiconductor wafer W as a processing object is mounted is provided on the upper surface.
- the mounting table 44 is formed in a substantially disc shape made flat by a ceramic such as alumina, and is supported from the side wall of the container via a support arm 46 bent in an L shape made of aluminum or the like. ing.
- a thin electrostatic chuck 50 having conductor wires arranged therein, for example, in a mesh shape. 50 Ueno placed on 0, W can be attracted by electrostatic attraction!
- the conductor wire of the electrostatic chuck 50 is connected to a DC power source 54 via a wiring 52 in order to exert the electrostatic attraction force.
- the wiring 52 is connected to a bias high-frequency power source 56 in order to apply a bias high-frequency power of 13.56 MHz to the conductor wire of the electrostatic chuck 50, for example.
- a heating means 58 including a resistance heater is provided to heat the wafer W as required.
- the mounting table 44 is provided with a plurality of, for example, three lifting pins (not shown) for lifting and lowering the wafer W when the wafer W is carried in and out.
- the entire mounting table 44 is made of a heat-resistant material, for example, ceramic such as alumina.
- a gate valve 48 that opens and closes when the wafer W is loaded into and unloaded from the inside of the processing chamber 42 is provided on the side wall of the processing chamber 42, and an exhaust that exhausts the atmosphere inside the chamber is provided at the bottom 60 of the chamber.
- a mouth 62 is provided.
- An exhaust system 64 is connected to the exhaust port 62 in order to exhaust, for example, vacuum exhaust the atmosphere in the processing vessel 42.
- the exhaust system 64 has an exhaust passage 66 connected to the exhaust port 62.
- a pressure control valve 68 made of, for example, a gate valve is interposed on the most upstream side of the exhaust passage 66, and further, for example, a first vacuum pump 70 made of, for example, a turbo molecular pump, and a dry pump, for example, toward the downstream side.
- Second vacuum port Are installed sequentially.
- a pressure detector 74 made of, for example, a capamanometer is provided on the side wall of the processing vessel 42. The pressure in the vessel measured here is input to the control means 114 described later, and the feedback of the pressure control valve 68 is provided. It can be controlled.
- a ceramic material such as A12 03 is made of quartz
- a top plate 76 that is permeable to microwaves is a seal such as an O-ring. It is provided in an airtight manner via member 78.
- the thickness of the top plate 76 is set to, for example, about 20 mm in consideration of pressure resistance.
- Plasma forming means 80 is provided on the top surface of the top plate 76 for generating (forming) plasma in the processing vessel 42.
- the plasma forming means 80 has a disk-shaped planar antenna member 82 provided on the top surface of the top plate 76, and a slow wave member 84 is provided on the planar antenna member 82. It is done.
- the slow wave material 84 has a high dielectric constant characteristic in order to shorten the wavelength of the microwave.
- the planar antenna member 82 is configured as a bottom plate of a waveguide box 86 made of a conductive hollow cylindrical container that covers the entire upper surface of the slow wave member 84, and is attached to the mounting table 44 in the processing container 42. It is provided to face each other.
- the periphery of the waveguide box 86 and the planar antenna member 82 are both connected to the processing vessel 42, and an outer tube 88A of the coaxial waveguide 88 is connected to the center of the upper portion of the waveguide box 86. It has been.
- An inner conductor 88B is provided in the outer tube 88A, and the inner conductor 88B is connected to the central portion of the planar antenna member 82 through a through hole at the center of the slow wave member 84.
- the coaxial waveguide 88 is connected to a microwave generator 94 having a matching (not shown), for example, 2.45 GHz via a mode converter 90 and a waveguide 92, and the above planar antenna. The microwave is transmitted to the member 82.
- the planar antenna member 82 is made of, for example, a copper plate or an aluminum plate whose surface is silver-plated, and a plurality of microwave radiation holes 96 made of, for example, long groove-like through holes are formed in the circular plate. Yes.
- the arrangement form of the microwave radiation holes 96 is not particularly limited.
- the microwave radiation holes 96 may be arranged concentrically, spirally, or radially.
- a gas injection means 98 for injecting a processing gas necessary for processing into the processing container 42 is provided above the mounting table 44, and the gas injection means 98 includes the gas injection means 98.
- a gas supply means 100 for supplying the processing gas while controlling the flow rate is connected.
- the gas injection means 98 is made of, for example, a quartz shower head formed in a lattice shape, and a large number of gas injection holes 102 are formed in the middle of the gas flow path.
- the diameter of the gas injection hole 102 is set to 0.5 mm or less, for example, so that the gas is uniformly injected into the processing container 42, and the conductance is set to be slightly low.
- This shower head has a structure in which the whole is formed in a box-like container shape and a plurality of gas injection holes are formed on the lower surface thereof, and the shape is not particularly limited.
- the gas supply means 100 has a gas flow path 104 whose tip is connected to the gas injection means 98.
- the base end of this gas flow path 104 is branched into a plurality of, in this case, three, and gas sources 104A, 104B, and 104C are connected to the respective branch paths to supply each gas as necessary. I can do it.
- the gas sources 104A to 104C respectively store different etching gases A to C as processing gases.
- a supply source of an inert gas such as N2 gas is further provided, which is not shown here.
- the flow controllers 106A to 106C for controlling the flow rate of the gas flowing therethrough are respectively interposed, and the upstream side and the downstream side of the respective flow controllers 106A to 106C.
- On-off valves 108A, 108B, and 108C respectively, so that each gas flows while controlling the flow rate as necessary.
- the flow controllers 106A to 106C a flow control system is used which can flow a large amount of gas instantaneously based on the pressure difference between the upstream and downstream sides and can also control the fine flow rate with high accuracy. No, no.
- a high-speed exhaust bypass passage 110 which is a feature of the present invention, is provided so as to communicate between the gas flow path 104 of the gas supply means 100 and the inside of the processing vessel 42.
- a high-speed exhaust opening / closing valve 112 is provided in the middle of the high-speed exhaust bypass passage 110, and the passage is communicated and blocked as necessary.
- the processing gas (etching gas) remaining in the gas flow path 104 can be discharged to the processing container 42 side at a high speed when necessary.
- the gas outlet 110A in the processing vessel 42 of the high-speed exhaust bypass passage 110 is positioned at the horizontal level of the mounting table 44.
- the etching gas exhausted into the processing container 42 is not directly exposed to the wafer W on the mounting table 44.
- the high-speed exhaust binus passage 110 it is preferable to use a pipe having a large inner diameter as much as possible, for example, a pipe having an inner diameter of 7 mm or more in order to increase the conductance of the exhaust due to the pressure in the processing vessel 42, etc. Yes.
- the overall operation of the plasma processing apparatus 40 is controlled by a control means 114 such as a microcomputer.
- a computer program for performing this operation is stored in a storage medium 116 such as a floppy CD (Compact Disc), HDD (Hard Disk Drive), or flash memory.
- a storage medium 116 such as a floppy CD (Compact Disc), HDD (Hard Disk Drive), or flash memory.
- supply of each processing gas and flow rate control, microwave and high frequency supply and power control, opening / closing control of the high-speed exhaust on-off valve 112, control of process temperature and process pressure Etc. are performed.
- the plasma processing as shown in FIG. 7, the etching gases A to C are supplied while being switched, and the antireflection film 36A, the Si02 film 36B, and the SiCO film 36C in FIG. A case will be described as an example.
- FIG. 7 is a cross-sectional view showing different types of laminated films laminated on a semiconductor wafer.
- an etching process is performed on the laminated film while changing the etching gas. I will explain to you.
- a SiC film 36D, a SiCO film 36C, a Si02 film 36B, and an antireflection film (BARC) 36A are sequentially laminated.
- a patterned resist film 38 serving as a mask is provided!
- the films other than the SiC film 36D laminated as described above are etched in a multi-step process according to the pattern of the resist film 38. As a result, trenches and holes are formed.
- an etching gas having a different gas type is used for each film, the antireflection film 36 A is etched with the etching gas A, the Si02 film 36B is etched with the etching gas B, and the SiC The O film 36C is removed by etching gas C.
- the etching gas A is flowed into the processing vessel 42 to cut the antireflection film 36A, and then the gas species is switched to the etching gas B to cut the Si02 film 36B.
- the SiCO film 36C is shaved by switching the gas type to the etching gas C.
- the etching time for each film is about 30 seconds for the antireflection film 36A, about 60 seconds for the Si02 film 36B, and about 60 seconds for the SiCO film 36C, depending on the film thickness.
- the process gas exhaust process of the immediately preceding process and the process gas pressure stabilization process of the next process are performed as described above.
- the semiconductor wafer W is accommodated in the processing container 42 by the transfer arm (not shown) via the gate valve 48, and the wafer W is moved to the upper surface of the mounting table 44 by moving the lifting pins (not shown) up and down.
- the wafer W is mounted on the mounting surface, and the wafer W is electrostatically attracted by the electrostatic chuck 50.
- the wafer W When the wafer W is provided with a heating unit, the wafer W is maintained at a predetermined process temperature, and a necessary processing gas, for example, here, an etching process is performed. Then, an etching gas is supplied at a predetermined flow rate, and is injected into the processing container 42 through the gas injection holes 102 of the gas injection means 98 including a shower head. At the same time, the vacuum pumps 70 and 72 of the exhaust system 64 are driven, and the pressure control valve 68 is controlled to maintain the inside of the processing vessel 42 at a predetermined process pressure. At the same time, by driving the microwave generator 94 of the plasma forming means 80, the microwave generated by the microwave generator 94 is transmitted through the waveguide 92 and the coaxial waveguide 88 to the planar antenna. Supply to member 82. Next, a microwave whose wavelength is shortened by the slow wave material 84 is introduced into the processing space S, thereby generating a plasma in the processing space S and performing an etching process using a predetermined plasma.
- each gas is converted into plasma by the microwaves and activated, and the wafer W is activated by the active species generated at this time.
- An etching process using plasma is performed on the surface.
- a bias is applied from the high-frequency power source for noise 56 to the conductor wire in the electrostatic chuck 50. For this reason, active species are drawn into the wafer surface with good straightness.
- the atmosphere in the processing container 42 is evacuated by driving the vacuum pumps 70 and 72 of the exhaust system 64 as described above.
- the atmosphere inside 42 diffuses from the processing space S, flows downward around the mounting table 44, and further flows from the exhaust port 62 to the exhaust system 64 side.
- the pressure in the processing vessel 42 is detected by a pressure detector 74, and the pressure control valve 68 is feedback controlled so as to maintain a desired process pressure.
- the etching process performed as described above is a multi-step process as described above, and the films 36A to 36C shown in FIG. 7 are successively etched in the same container. Go.
- the etching gas A to be used is switched to the etching gas C and supplied to the etching gas used every time the film to be etched is different. That is, every time one etching step process is completed, the microwave generator 94 is turned off to stop the plasma, and at that time, supply of the etching gas is stopped. Thereafter, the residual gas is removed from the processing container 42 and the gas flow path 104.
- etching gas of a different gas type is supplied, that is, the etching gas is switched to stabilize the pressure in the processing vessel 42, and after the stabilization, the microwave generator 94 is turned on again. Therefore, plasma is formed and the next etching step process is started.
- the etching gas when starting each etching step process, is made to flow at a predetermined amount with a predetermined flow rate determined from the beginning. It takes a certain amount of time for the gas to fill the processing vessel 42 and stabilize the process pressure. In addition, it is directly connected to the gas flow path 104 of the gas supply means 100. In the case where the etching gas of the previous treatment remains, more time is required to eliminate the residual gas, which causes a decrease in throughput.
- an etching gas having a flow rate larger than the specified flow rate for example, about 3 times the specified flow rate, is initially applied for a predetermined short time. For example, supply for about 1 second. Immediately after that, reduce the flow rate and flow at the specified flow rate. As a result, the pressure can be stabilized quickly and the etching process can be started, and the throughput can be improved accordingly.
- the high-speed exhaust opening / closing valve 112 is opened for a short period of time immediately before remaining in the gas flow path 104.
- the etching gas for processing is quickly discharged into the processing container 42 via the high-speed exhaust bypass passage 110 having a large exhaust conductance.
- the high-speed exhaust bypass passage 110 is not provided, the residual gas in the gas passage 104 escapes into the processing container 42 through the shower head.
- the exhaust conductance of the gas injection means 98 which is the shower head is small, it takes a relatively long time for the residual gas in the gas flow path 104 to escape into the processing vessel 42 through the shear head. As a result, the throughput decreases.
- the high-speed exhaust bypass passage 110 is provided in relation to the above-described points so that the residual gas is quickly discharged, so that the throughput can be improved accordingly.
- FIG. 2 is a diagram showing a change in pressure in the processing container
- FIG. 2 (A) shows the case of the method of the comparative example
- FIG. 2 (B) shows the case of the method of the present invention
- FIG. 3 is a diagram showing an example of a timing chart when the etching gas as the processing gas is switched, and a part of FIG. 2B is enlarged in time.
- FIG. 4 is a flowchart showing each step of the method of the present invention.
- the state at the time of switching from the etching gas A to the etching gas B is shown, and when the etching gas B force is switched to the etching gas C, the same operation is performed.
- RF ON means that plasma is formed and the etching process is actually performed.
- the period between “RF on” is the period from the end of the previous etching process to the end of the switching of the etching gas until the pressure in the processing vessel 42 is stabilized.
- the period Atl until pressure stabilization was about 10 seconds, whereas in the case of the present invention shown in FIG. Shows that the time until pressure stability is reduced to about 2 seconds, which can greatly improve the throughput.
- Fig. 3 (A) shows the change in the flow rate of etching gas A
- Fig. 3 (B) shows the change in the flow rate of etching gas B
- Fig. 3 (C) shows the opening and closing of the on-off valve for high-speed exhaust.
- Fig. 3 (D) shows the valve opening of the pressure control valve
- Fig. 3 (E) shows the pressure change in the processing vessel.
- the on-off valve 108A of the gas flow path that has supplied the etching gas A is closed, and the supply of the etching gas A is stopped. Stop (S 2).
- the high-speed exhaust on-off valve 112 is opened (S3), and the pressure control valve 68 is set to a sufficiently large valve opening (S4).
- the residual gas in the processing vessel 42 is quickly exhausted, and the etching gas A remaining in the gas flow path 104 of the gas supply means 100 is passed through the high-speed exhaust bypass passage 110 having a large exhaust conductance. Then, a high vacuum is generated and discharged into the processing container 42. At this time, the residual gas in the gas injection means 98 composed of a shower head has a small exhaust conductance at the portion of the gas injection hole 102 having the small diameter. It will be discharged into the processing container 42 through the passage 110.
- the residual gas in the processing container 42 is immediately discharged to the exhaust system 64 side.
- the residual gas (etching gas A) in the gas injection means 98 including the shower head, in the gas flow path 104, and in the processing vessel 42 is quickly discharged out of the system.
- the pressure in the processing vessel 42 can be rapidly reduced.
- the pressure control valve 6 The valve opening of 8 is 50% larger than the normal pressure control range in order to sufficiently increase the exhaust conductance in this part.
- the valve opening of the pressure control valve 68 is within the range of, for example, 50 to 100%, the exhaust conductance is saturated and hardly changes.
- valve opening is set to 100% and then the valve opening is set to about 20% for pressure control, the valve operation time will become longer until the valve opening is reached. As shown, the valve opening is set to about 50%.
- the valve opening indicates a region where exhaust gas actually flows at the valve opening of the pressure control valve 68. When the valve opening is half open, the valve opening is 50%, and when the valve opening is fully opened, the valve opening is not performed. The degree is 100%.
- the high-speed exhaust on-off valve 112 is switched to the closed state at time P2 (S6), and then For this process, the etching gas B on-off valve 108B is opened and the supply of the etching gas B is started (S7). 0 At this time, the flow rate of the etching gas B is predetermined for this process.
- the flow rate controller 106B is set so that the flow rate is larger than the specified flow rate, for example, a flow rate M2 that is three times the specified flow rate Ml, and the etching gas B starts to flow at this high flow rate.
- an instruction is issued to the pressure control valve 68 so that the opening degree of the valve corresponds to the set pressure during the etching gas B process (S8).
- the valve opening corresponding to the set pressure is substantially determined, and an instruction is issued so that the pressure control valve 68 operates toward this valve opening.
- the valve opening during the process is normally controlled within the range of 5-20%.
- the flow rate of the etching gas B is set to the specified flow rate Ml at the time of the process P3. Then, in this state, the flow controller 106B is switched to automatic operation by feedback control (S10).
- the magnitude of the flow rate M2 at the time of supplying a large flow rate of the etching gas B includes the capacity V of the processing vessel 42, the process pressure P of the etching process using the etching gas B, and the process. It is determined by the time T required to increase the pressure in the container 42 to the above process pressure. For example, if the volume V in the processing vessel 42 is 40 liters and the process pressure l is lPa, the required amount Vol of etching gas B at 1 atm is roughly expressed by the following equation.
- an etching gas having a flow rate larger than the specified flow rate for example, about 3 times the specified flow rate
- a predetermined short time For example, supply for about 1 second.
- the flow rate is immediately reduced to flow at the specified flow rate.
- the high-speed exhaust on-off valve 112 is opened for a short period of time immediately before remaining in the gas flow path 104.
- the etching gas for processing is quickly discharged into the processing container 42 via the high-speed exhaust bypass passage 110 having a large exhaust conductance. If the bypass passage 110 for high-speed exhaust is not provided, the residual gas in the gas flow path 104 is processed through a shower head. The force that escapes into the container 42 The exhaust conductance of the gas injection means 98 that also has the shower head force is small, so that the residual gas in the gas flow path 104 is relatively free to escape into the processing container 42 through the shower head. It takes a long time and throughput decreases.
- the high-speed exhaust no-pass passage 110 is provided to discharge the residual gas quickly with respect to the above-described points, so that the throughput can be improved correspondingly.
- the gas outlet 110A on the downstream side of the high-speed exhaust bypass passage 110 is provided so as to face the processing vessel 42.
- the present invention is not limited to this, and the high-speed exhaust binos passage 110 is provided. May be connected to the exhaust passage 66 side of the exhaust system 64 so that residual gas in the gas flow path 104 or the like is discharged directly to the exhaust system 64 side (two-dot chain line in FIG. 1). See).
- the volume of the container for discharging the etching gas remaining in the gas flow path 104 is larger in the processing container 42 than in the exhaust passage 66, the pressure increase in the container due to the etching gas discharge is the processing container 42.
- the high-speed exhaust binos passage 110 is provided, and the residual gas in the gas flow path 104 and the shower head of the gas supply means 100 is sucked into the processing vessel 42 side and exhausted quickly. Although it was removed, this high-speed exhaust bypass passage 110 should not be provided. In this case, it is only necessary to flow the etching gas at a large flow rate for a predetermined short time At3 when the supply of a new processing gas (etching gas) is started. Compared to the case shown in Fig. 2 (B), it takes some time to discharge the residual gas, as compared with the case shown in Fig. 2 (B) .However, compared with the comparative method shown in Fig. 2 (A), Residual gas can be discharged in a short time.
- the time for discharging the residual gas that is, the time between PI and P2 becomes longer.
- the time required for gas switching can be shortened compared to the case of the comparative method shown in FIG.
- the state of pressure change in the processing vessel 42 at this time is shown in FIG. 2 (C), and the time A t5 until the processing gas stabilizes is longer than the time At 2 shown in FIG. 2 (B).
- the time Atl of the comparative method shown in Fig. 2 (A) for example, about 4 seconds.
- the throughput can be improved.
- the plasma etching process using plasma is described as an example of the predetermined process.
- the present invention is not limited to this, and plasma CVD process, plasma ALD (atomic layered deposition) film formation process,
- the present invention can be applied to all processes such as plasma sputtering and plasma modification, and is particularly effective for multi-step processing in which gas types are switched and supplied in the middle.
- FIG. 5 is a cross-sectional view showing a modification of the treatment apparatus of the present invention, and shows a case where the present invention is applied to a heat treatment apparatus.
- the same components as those shown in FIG. 1 are given the same reference numerals.
- This heat treatment apparatus performs an ALD film forming process in which a thin film is formed one layer at a time while repeating a thermal CVD process and a film forming gas.
- a heating means 58 composed of a resistance heater for heating the wafer is embedded in the mounting table 44, and the gas injection means 98 is composed of a box-shaped container-like shower head, and a diffusion plate 120 is provided inside. It has been.
- the heating means 58 there may be used a heating lamp in which the mounting table is formed in a thin disk shape and heated from below.
- the gas supply means 100 there are three gas sources 120A, 120B, and 120C for storing three kinds of film forming gases A, B, and C, respectively.
- Membrane gases A, B, and C are switched and supplied.
- the gas flow path 104 and the processing vessel 42 are communicated with each other by a high-speed exhaust bypass passage 110 having a high-speed exhaust on-off valve 112 interposed therebetween. Also in this case, the same operational effects as those of the above-described embodiments can be exhibited.
- the present invention is not limited to this, and the present invention can be applied to a glass substrate, an LCD substrate, a ceramic substrate, and the like.
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US12/226,089 US8366869B2 (en) | 2006-04-07 | 2007-04-06 | Processing apparatus and processing method |
CN2007800125467A CN101416284B (zh) | 2006-04-07 | 2007-04-06 | 处理装置及处理方法 |
EP07741204A EP2006893A4 (en) | 2006-04-07 | 2007-04-06 | TREATMENT METHOD AND APPARATUS |
US13/729,417 US8545711B2 (en) | 2006-04-07 | 2012-12-28 | Processing method |
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JP2006106107A JP4943047B2 (ja) | 2006-04-07 | 2006-04-07 | 処理装置及び処理方法 |
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US12/226,089 A-371-Of-International US8366869B2 (en) | 2006-04-07 | 2007-04-06 | Processing apparatus and processing method |
US13/729,417 Division US8545711B2 (en) | 2006-04-07 | 2012-12-28 | Processing method |
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EP (1) | EP2006893A4 (ja) |
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CN (1) | CN101416284B (ja) |
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- 2007-04-06 WO PCT/JP2007/057768 patent/WO2007116969A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
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KR20080037704A (ko) | 2008-04-30 |
KR100976207B1 (ko) | 2010-08-17 |
US20130126001A1 (en) | 2013-05-23 |
EP2006893A4 (en) | 2010-05-19 |
JP4943047B2 (ja) | 2012-05-30 |
CN101416284A (zh) | 2009-04-22 |
CN101416284B (zh) | 2011-02-02 |
TWI463561B (zh) | 2014-12-01 |
TW200746294A (en) | 2007-12-16 |
US20090053900A1 (en) | 2009-02-26 |
US8545711B2 (en) | 2013-10-01 |
JP2007281225A (ja) | 2007-10-25 |
US8366869B2 (en) | 2013-02-05 |
EP2006893A1 (en) | 2008-12-24 |
TW201338036A (zh) | 2013-09-16 |
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