WO2016013131A1 - ラジカルガス発生システム - Google Patents
ラジカルガス発生システム Download PDFInfo
- Publication number
- WO2016013131A1 WO2016013131A1 PCT/JP2014/078724 JP2014078724W WO2016013131A1 WO 2016013131 A1 WO2016013131 A1 WO 2016013131A1 JP 2014078724 W JP2014078724 W JP 2014078724W WO 2016013131 A1 WO2016013131 A1 WO 2016013131A1
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- WIPO (PCT)
- Prior art keywords
- gas
- radical gas
- radical
- discharge
- processing chamber
- Prior art date
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- 239000007789 gas Substances 0.000 claims description 302
- 230000004888 barrier function Effects 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 7
- 150000004767 nitrides Chemical class 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 4
- YZCKVEUIGOORGS-IGMARMGPSA-N Protium Chemical compound [1H] YZCKVEUIGOORGS-IGMARMGPSA-N 0.000 claims description 4
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 4
- 229910001882 dioxygen Inorganic materials 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- 229910052594 sapphire Inorganic materials 0.000 claims description 3
- 239000010980 sapphire Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 150000003254 radicals Chemical class 0.000 claims 22
- -1 Oxygen radical Chemical class 0.000 claims 2
- 150000002831 nitrogen free-radicals Chemical group 0.000 claims 1
- 239000010408 film Substances 0.000 description 40
- 239000010409 thin film Substances 0.000 description 16
- 230000015572 biosynthetic process Effects 0.000 description 12
- 239000003989 dielectric material Substances 0.000 description 9
- 238000005229 chemical vapour deposition Methods 0.000 description 8
- 230000002093 peripheral effect Effects 0.000 description 7
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- 239000004065 semiconductor Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000005684 electric field Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000002230 thermal chemical vapour deposition Methods 0.000 description 1
Images
Classifications
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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
- C23C16/513—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 plasma jets
-
- 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
- H01J37/32348—Dielectric barrier discharge
-
- 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
-
- 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
- H01J37/32532—Electrodes
- H01J37/32541—Shape
-
- 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
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
-
- 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]
-
- 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
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
- H01L21/02271—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
- H01L21/02274—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition in the presence of a plasma [PECVD]
Definitions
- the present invention relates to a radical gas generation system capable of generating radical gas and performing processing using the radical gas. For example, when a high-performance insulating film is formed on an object to be processed It is possible to use.
- Multifunctional and high-quality thin films are required in various fields including semiconductor manufacturing. Yes.
- a low impedance high conductive film equivalent to circuit wiring a high magnetic film having circuit wiring coil function and magnet function, and a high dielectric having circuit capacitor function
- a body film, a high insulation film having a high insulation function with little electrical leakage current, and the like are provided.
- a thermal CVD (Chemical Vapor Deposition) apparatus As conventional techniques for forming these films, for example, a thermal CVD (Chemical Vapor Deposition) apparatus, a photo CVD apparatus or a plasma CVD apparatus is used, and in particular, many plasma CVD apparatuses are used. Yes. This is because, for example, a plasma CVD apparatus has a lower film formation temperature and a higher film formation speed and enables a film formation process in a shorter time than a thermal / photo CVD apparatus.
- a gate insulating film such as a nitride film (SiON, HfSiON, etc.) or an oxide film (SiO 2 , HfO 2 ) is formed on a semiconductor substrate
- a plasma CVD apparatus is generally used. It has been adopted.
- a gas such as NH 3 (ammonia), N 3 , O 2 , or O 3 (ozone) and a precursor gas such as silicon or hafnium are directly supplied to the processing chamber apparatus in which the CVD process is performed.
- the precursor gas is dissociated to generate metal particles, and a nitride film or an oxidation film is formed on the target object by a chemical reaction between the metal particles and the gas such as NH 3 (ammonia).
- a thin film such as a film is formed.
- the object to be processed is exposed to radical gas or plasma ions (or electrons) having high energy.
- Patent Document 1 exists as a prior art document that discloses a technique related to a plasma CVD apparatus.
- the object to be processed is directly exposed to the plasma as described above. Therefore, the object to be processed has been greatly damaged by plasma (ions and electrons) such as lowering the performance of the semiconductor function.
- the object to be processed is not damaged by plasma (ions or electrons), and a high quality nitride film, oxide film or the like is formed.
- plasma ions or electrons
- a high quality nitride film, oxide film or the like is formed.
- a high concentration NH 3 gas or O 3 gas that is easily dissociated by heat or light irradiation is used as a source gas.
- a heating catalyst body is provided in the CVD chamber apparatus.
- the plasma generation region and the material processing region are separated by a partition wall (plasma confining electrode).
- the plasma confining electrode is provided between the high-frequency applying electrode and the counter electrode on which the object to be processed is installed.
- Radical gas is very reactive. Therefore, by applying a radical gas (less than about 1%: 10000 ppm) or less to the object to be processed, the chemical reaction in the object to be processed is promoted, and a nitride thin film, an oxide thin film, or a hydrogen reduction film (hydrogen bonding) An accelerated metal film) can be produced efficiently in a short time.
- a radical gas less than about 1%: 10000 ppm
- a hydrogen reduction film hydrogen bonding
- a discharge cell is provided, and in the discharge cell, a high electric field plasma is realized by a dielectric barrier discharge corresponding to atmospheric pressure plasma. Thereby, high-quality radical gas is generated from the raw material gas exposed to the plasma of the discharge cell.
- the conventional radical gas generator cannot generate an effective radical gas with very high reactivity. Moreover, it was difficult to obtain a large amount of radical gas. At the same time, the generated radical gas has a very short lifetime. Therefore, it is difficult to guide radicals from a radical gas generation device to a radical gas treatment field (a thin film production field, a treatment chamber device) provided separately from the radical gas production device while suppressing a decrease in concentration. Met.
- a method of making the outlet of the radical gas into an orifice shape is conceivable. That is, a method of constricting the opening diameter of the opening in the opening, which is a radical gas transmission path, connected from the radical gas generator to the processing chamber apparatus is conceivable.
- a pressure in the processing chamber apparatus is reduced (vacuum state)
- a difference between the pressure in the radical gas generation apparatus and the pressure in the processing chamber apparatus occurs, and the radical gas is fed into the processing chamber apparatus at a high speed.
- the radical gas can be guided from the radical gas generating device into the processing chamber device while maintaining a high concentration.
- the diameter of the opening needs to be, for example, about several tens of mm.
- the region to which the radical gas is irradiated is limited with respect to the target object in the processing chamber apparatus. That is, it is difficult to form a uniform thin film with a large area (for example, a workpiece having a diameter of 200 mm or more).
- the present invention provides a radical gas generating device and a radical gas generating device in a radical gas generating system (remote plasma type film forming processing system) in which a radical gas generating device and a processing chamber device are arranged separately and adjacent to each other. It is possible to provide a radical gas generation system that can be led to a processing chamber apparatus and that can perform uniform processing using a radical gas even for an object to be processed having a large area, for example. Objective.
- a radical gas generation system uses a dielectric barrier discharge to generate a radical gas from a source gas, and is connected to the radical gas generation device.
- a processing chamber apparatus in which a target object is disposed, and a processing using the radical gas is performed on the target object.
- the radical gas generating device has a table on which the object to be processed is placed and rotates the object to be processed, and the radical gas generator generates the dielectric barrier discharge, and the raw material
- a source gas supply unit configured to supply gas into the radical gas generation device, wherein the discharge cell includes a first electrode unit including a first electrode member, and the first electrode.
- a second electrode portion having a second electrode member disposed in opposition, and connected to the inside of the processing chamber apparatus and facing the object to be processed disposed on the table, the dielectric
- the discharge cell that has an opening that outputs the radical gas generated from the source gas by body barrier discharge, and is disposed farther from the center position of the rotation in plan view,
- the facing area which is a region where the first electrode member and the second electrode member are facing each other is increased.
- a radical gas generation system uses a dielectric barrier discharge to generate a radical gas from a raw material gas, and is connected to the radical gas generation device, the radical gas generation device, and an object to be processed inside And a processing chamber apparatus that performs processing using the radical gas on the object to be processed.
- the processing chamber apparatus has the object to be processed mounted thereon.
- the radical gas generator has a plurality of discharge cells that generate the dielectric barrier discharge, and the source gas in the radical gas generator.
- the discharge cell is disposed opposite to the first electrode, the first electrode having a first electrode member, and the second electrode.
- a second electrode portion having a member, and connected to the inside of the processing chamber apparatus, facing the target object disposed on the table, and generated from the source gas by the dielectric barrier discharge
- the discharge cell that has an opening that outputs the radical gas, and is disposed farther from the center position of the rotation in plan view, the first electrode member and the second electrode
- the facing area which is a region facing the electrode member, is increased.
- the radical gas generated by the radical gas generating device can be directly led to the processing chamber device through the opening. Further, the amount of radical gas (concentration) of the radical gas ejected from each discharge cell using one AC high voltage power supply without providing a plurality of AC high voltage power supplies for one radical gas generator. ) Can be controlled. Therefore, it is possible to perform uniform radical gas treatment on a large-scale object to be processed.
- the inventors As described above, in the remote plasma film formation processing system, as a configuration capable of guiding the radical gas from the radical gas generation device into the processing chamber device while maintaining a high concentration, the inventors The structure which made the opening diameter of this small was found.
- the radical gas generating device and the processing chamber device are adjacent to each other so that the radical gas generating device is in the upper stage, and the opening is a radical connected from the radical gas generating device to the processing chamber device.
- This is a gas transmission path.
- a plurality of openings are provided. Each opening faces the main surface of the object to be processed.
- a process using a radical gas (hereinafter referred to as a film formation process as an example) is uniformly performed on an object to be processed in the processing chamber apparatus. Is difficult. By increasing the number of openings, the non-uniformity is somewhat eliminated, but nonetheless a non-uniformity problem exists.
- the inventors considered a configuration in which the object to be processed is rotated in a plan view in the processing chamber apparatus.
- the following configuration is also conceivable as a method for further eliminating the non-uniformity of the film formation. That is, as described above, there are a plurality of openings that are radical ejection portions. Accordingly, a discharge cell is provided corresponding to each opening, and the amount of radical gas (radical gas concentration) generated in each discharge cell is controlled.
- FIG. 1 is a cross-sectional view showing a configuration example of a radical gas generation system 500 according to the present embodiment.
- FIG. 2 is an enlarged cross-sectional view showing the configuration of the discharge cell 70 disposed in the radical gas generator 100.
- the radical gas generation system 500 includes a radical gas generation device 100, a processing chamber device 200, an AC high voltage power supply 9, and a vacuum pump 300.
- a radical gas generation device 100 that generates the radical gas G2 and a processing chamber device 200 that performs a film forming process using the generated radical gas G2 are provided separately. This is a remote plasma deposition system.
- the bottom surface side of the radical gas generation device 100 and the top surface side of the processing chamber device 200 are in contact with each other.
- the radical gas generation apparatus 100 and the processing chamber apparatus 200 are connected via the opening 102.
- a plurality of openings 102 are formed.
- the dielectric barrier discharge is used to generate the radical gas G2 from the source gas G1 (a part of the source gas G1 is radicalized by the dielectric barrier discharge, and the radical gas G2 is Generated).
- each discharge cell 70 is provided on the bottom surface of the radical gas generator 100.
- each discharge cell 70 is composed of first electrode portions 1 and 2 and second electrode portions 5, 31 and 3.
- the first electrode parts 1 and 2 face the second electrode parts 5, 31 and 3 with a predetermined interval.
- a discharge space 40 in which a dielectric barrier discharge is generated is formed between the first electrode portions 1 and 2 and the second electrode portions 5, 31 and 3.
- the first length One or more spacers 4 are disposed between the electrode parts 1 and 2 and the second electrode parts 5, 31 and 3.
- the first electrode parts 1 and 2 are composed of a low voltage electrode (which can be grasped as a first electrode member) 1 and a first dielectric 2.
- the low-voltage electrode 1 has a ground potential and is disposed on the bottom surface of the radical gas generator 100. All the discharge cells 70 share one low voltage electrode 1.
- the first dielectric 2 is formed on the low voltage electrode 1.
- the second electrode parts 5, 31, 3 are composed of a high voltage electrode block 5, a high voltage electrode (which can be grasped as a second electrode member) 31, and a second dielectric 3.
- a high voltage electrode 31 is formed on the second dielectric 3, and the high voltage electrode block 5 is connected to the high voltage electrode 31.
- the high voltage electrode block 5 is supplied with a high AC voltage. Further, since the high voltage electrode block 5 and the high voltage electrode 31 are electrically connected, a high voltage is also applied to the high voltage electrode 31.
- the discharge cell 70 has an opening 102 that functions as an orifice.
- the opening 102 is formed so as to penetrate the first dielectric 2 and the low-voltage electrode 1.
- the opening 102 is formed at the center of the first dielectric 2.
- the opening 102 connects the radical gas generation apparatus 100 (more specifically, the discharge space 40) and the processing chamber apparatus 200. Therefore, the radical gas G ⁇ b> 2 generated in the discharge space 40 is output into the processing chamber apparatus 200 through the opening 102.
- the opening 102 faces the processing surface of the target object 202 disposed in the processing chamber apparatus 200.
- the outline shape of the discharge cell 70 when viewed in plan is a disk shape. That is, the first dielectric 2 and the second dielectric 3 are both disk-shaped, and both 2 and 3 are arranged in parallel (the high-voltage electrode 31 is also disk-shaped).
- the outer peripheral end of the first dielectric 2 and the outer peripheral end of the second dielectric 3 are aligned.
- the outline shape of the discharge cell 70 in plan view does not need to be a disc shape, and may be another shape as long as the same effect is obtained.
- each discharge cell 70 the contour shape is the same.
- the contour dimension of the discharge cell 70 when viewed in plan is the first dielectric 2 (similarly, the second dielectric 3). Determined by the diameter.
- the AC high voltage power supply 9 applies an AC high voltage for causing discharge to the radical gas generator 100 (more specifically, each discharge cell 70).
- a dielectric barrier discharge is generated in the discharge space 40 of each discharge cell 70.
- radical gas G2 is produced
- the source gas supply unit 101 is disposed on the upper surface of the radical gas generator 100. From the source gas supply unit 101, a source gas G1 that is a source of the radical gas G2 is supplied into the radical gas generator 100. The source gas G1 supplied from the source gas supply unit 101 is filled in the radical gas generation apparatus 100, enters from the outside of each discharge cell 70 into each discharge cell 70 in a uniform amount, and each discharge space. It flows in 40.
- the radical gas G2 generated by the radical gas generation apparatus 100 is ejected.
- processing such as thin film formation is performed on the main surface of the target object 202 using the radical gas.
- nitrogen gas is supplied to the radical gas generator 100 as the source gas G1.
- nitrogen radical gas is generated as the radical gas G2 from the nitrogen gas. Therefore, in the processing chamber apparatus 200, a nitride film is formed on the workpiece 202 using the nitrogen radical gas G ⁇ b> 2 ejected from the radical gas generation apparatus 100.
- ozone gas or oxygen gas is supplied to the radical gas generator 100 as the source gas G1.
- oxygen radical gas is generated as the radical gas G2 from the ozone gas or the oxygen gas. Therefore, in the processing chamber apparatus 200, an oxide film is formed on the target object 202 using the oxygen radical gas G ⁇ b> 2 ejected from the radical gas generation apparatus 100.
- a gas discharge unit 203 connected to the vacuum pump 300 is disposed on the lower side surface of the processing chamber apparatus 200.
- the pressure in the processing chamber apparatus 200 is maintained at about several torr to several tens of torr (several kPa).
- a gas flow from the radical gas generation device 100 to the processing chamber device 200 is also formed by the vacuum pump 300. Since the opening 102 functions as an orifice, a pressure section can be formed between the radical gas generation apparatus 100 and the processing chamber apparatus 200.
- the processing chamber apparatus 200 is provided with a table 201.
- a target object 202 is placed on the table 201.
- the radical gas G2 ejected from the opening 102 of the radical gas generation device 100 is applied to the object 202 to be processed. Then, processing using the radical gas G2 is performed on the object 202 (for example, a thin film is formed).
- the table 201 rotates clockwise or counterclockwise in a plan view in a state where the workpiece 202 is placed. Due to the rotation of the table 201, the workpiece 202 is similarly rotated.
- each discharge cell 70 is the same. Further, the opening diameter of the opening 102 formed in each discharge cell 70 is also the same. Therefore, the pressure loss due to the gas flow is the same in each discharge cell 70 and the opening 102. Therefore, gas flows uniformly in each discharge cell 70, and the ejection speed of the radical gas G2 ejected into the processing chamber apparatus 200 is also substantially constant.
- one end of the AC high voltage power supply 9 is connected to the low voltage electrode 1 via a terminal 8.
- the low-voltage electrode 1 is common and has a ground potential.
- the other end of the AC high voltage power supply 9 is connected to the high voltage electrode block 5 of each discharge cell 70 via the terminal 7. With this connection relationship, the AC high voltage power supply 9 can apply an AC high voltage to each discharge cell 70.
- one AC high voltage power supply 9 is used for each discharge cell 70. Further, in the low-voltage electrode 1 and the high-voltage electrode block 5, a structure that can be cooled with cooling water or the like to cool the generated heat is formed. From the viewpoint of simplifying the drawing, the configuration related to the cooling is as follows. The illustration is omitted in FIG.
- each discharge cell 70 a region where the high voltage electrode 31 and the low voltage electrode 1 face each other is a discharge space 40.
- a low voltage potential of an AC high voltage power supply 9 is applied to the low voltage electrode 1, and the high voltage potential of the AC high voltage power supply 9 passes through the terminal 7 and each high voltage electrode block 5 to each high voltage electrode 31.
- a dielectric barrier discharge is generated in each discharge space 40.
- the source gas G1 and the dielectric barrier discharge generate radical gas G2 in each discharge space 40 (a part of the source gas G1 is radicalized by the dielectric barrier discharge to generate radical gas. G2 is generated).
- the generated radical gas G2 is ejected to the target object 202 in the processing chamber apparatus 200 through each opening 102.
- the concentration of the radical gas G2 ejected into the processing chamber apparatus 200 is usually less than 1% (10000 ppm), and the gas that occupies most of the remainder is the source gas G1. Therefore, the source gas G1 serves as a carrier gas that carries the generated radical gas G2 from each discharge cell 70 into the processing chamber apparatus 200 in a short time.
- the ejection speed of the radical gas G2 ejected from each discharge cell 40 opening 102 is determined by the source gas G1. Therefore, if the ejection speed becomes slow, it takes time for the radical gas G2 to reach the workpiece 202, and the possibility that a part of the generated radical gas G2 disappears increases. That is, the object 202 is irradiated with a radical gas G2 having a low gas amount (gas concentration). This means that the processing efficiency using the radical gas G2 for the workpiece 202 is lowered.
- the opening diameter of the opening 102 is reduced, the ejection speed of the radical gas G2 increases, and the extinction of the radical gas G2 can be suppressed.
- the area irradiated with the radical gas G2 in the workpiece 202 is limited.
- the opening 102 is formed in each discharge cell 70.
- it is difficult to uniformly irradiate the object 202 with the radical gas G2. is there.
- the discharge cells 70 have the same contour shape and the opening diameters of the openings 102 are the same in the plurality of discharge cells 70.
- the following configuration enables a uniform radical gas treatment over a wide range on the object 202 to be processed while keeping the ejection speed of the radical gas G2 constant at a high speed in each discharge cell 70.
- the target object 202 is rotated at a constant speed by the table 201 when the radical gas G2 is irradiated.
- the radical gas generation apparatus 100 is provided with a plurality of discharge cells 70, and an opening 102 is provided in each discharge cell 70. The position of the opening 102 is fixed.
- the radical gas treatment in a wider range of the workpiece 202 can be performed by rotating the workpiece 202.
- the peripheral speed varies depending on the position of the workpiece 202 from the center of rotation due to the rotation of the workpiece 202.
- the radical gas processing capability for the object 202 varies depending on the distance from the center of rotation of the object 202.
- the radical gas G2 ejected from each discharge cell 70 is radicalized according to the peripheral speed of rotation of the object 202 (table 201). It is necessary to control the flow rate component.
- the flow rate of the radical gas G2 is controlled so that the high voltage electrode 31 and the low voltage electrode 1 face each other in the discharge cell 70 disposed farther from the rotational center position of the workpiece 202 in plan view. Increase the facing area, which is the current area. Specifically, the area of the high-voltage electrode 31 formed on the second dielectric 3 is increased as the discharge cells 70 are arranged farther from the rotation center position of the object 202 to be processed.
- the size of the discharge space 40 is different, and the generation amount of the radical gas G2 is also different. Therefore, the radicalized flow rate component can be changed according to the arrangement position of the discharge cell 70.
- the peripheral speed increases at a position far from the rotation center of the workpiece 202, the irradiation time of the radical gas G2 is shortened.
- the peripheral speed is slow, so the irradiation time of the radical G2 is long.
- the rotational speed (angular speed) of the workpiece 202 is constant.
- the high voltage electrode 31 is in close contact with the second dielectric 3 so as to increase the amount of radical gas (radical gas concentration) generated in the discharge cell 70 so as to be inversely proportional to the irradiation time determined by the position where the discharge cell 70 is disposed.
- size of the discharge space 40 can be changed with the structure of the following high voltage electrode 31, for example.
- the other discharge cell 70 is separated by a second distance from the center of rotation of the workpiece 202 in plan view.
- the first distance is smaller than the second distance.
- the area of the high voltage electrode 31 in the other discharge cell 70 is made larger than the area of the high voltage electrode 31 in the one discharge cell 70.
- the ejection speed of the radical gas G2 is mainly determined according to the outer shapes of the dielectrics 2 and 3. Therefore, it has been described that the same contour outline is desirable in each discharge cell 70 from the viewpoint of the same ejection speed of the radical gas G2.
- the dielectrics 2 and 3 have the same outline, Even if the outer shape of the high voltage electrode 31 is changed, the ejection speed of the radical gas G2 ejected from each discharge cell 70 can be made substantially the same.
- the plurality of discharge cells 70 are disposed in the radical gas generation apparatus 100, and the opening 102 is provided with respect to each discharge cell 70. Is arranged. Further, the radical gas G ⁇ b> 2 is guided from the radical gas generation device 100 to the processing chamber device 200 through the opening 102. And the to-be-processed object 202 is rotated. Further, in each discharge cell 70, the size of the discharge space 40 is changed according to the distance from the rotation center of the workpiece 202.
- the radical gas G2 (radical gas G2 in which a part of the raw material gas G1 is radicalized by dielectric barrier discharge) generated by the radical gas generation apparatus 100 is directly supplied to the processing chamber apparatus 200 through the opening 102. Can lead to.
- the amount (concentration) of radical gas can be controlled. Therefore, it is possible to perform uniform radical gas treatment on the large-scale object 202 to be processed.
- each opening 102 is also the same in each discharge cell 70. Therefore, since the radical amount (concentration) generated in the discharge space 40 is variably controlled at most less than 1%, the arrangement of the discharge cell 70 is maintained while maintaining the gas velocity ejected from the opening 102 substantially the same.
- the radical amount (concentration) can be controlled according to the position.
- the opening diameter of the opening 102 through which the radical gas G2 is ejected can be reduced, and the speed of the radical gas G2 can be increased. Therefore, the radical gas G2 can reach the object 202 to be processed in a short time, and the disappearance of the radical gas G2 before reaching the object 202 can be suppressed.
- each dielectric 2 and 3 disposed facing the discharge space 40 may be made of single crystal sapphire or quartz.
- the dielectrics 2 and 3 are damaged by the dielectric barrier discharge. Therefore, if each of the dielectrics 2 and 3 is made of single crystal sapphire or quartz, the discharge resistance of the dielectrics 2 and 3 is improved, and as a result, particles precipitated on the dielectrics 2 and 3 due to dielectric barrier discharge. The amount can be suppressed.
- the discharge space 40 in order to generate a good quality radical gas G2 by dielectric barrier discharge in the discharge space 40, the discharge space 40 needs to be in a high electric field plasma state.
- the electric field in the discharge space 40 depends on the product value of the gas pressure in the discharge space 40 and the gap length in the discharge space.
- the “P ⁇ d (kPa ⁇ cm)” product The value is required to be a predetermined value or less.
- P is the pressure in the radical gas generator 100
- d is the gap length (the distance from the first dielectric 2 to the second dielectric 3) in each discharge cell 70, and each discharge cell 70, which is uniform).
- the latter case is more beneficial in terms of: That is, in the latter case, the flow velocity of the gas flowing in the discharge space 40 is increased, the gap length (discharge surface wall) is widened, and the loss due to the collision amount of the radical gas G2 with the wall is suppressed. (In other words, decomposition of the amount of generated radical gas (radical gas concentration) can be suppressed).
- the inventors have determined that the radical gas generation device 100 preferably satisfies the following conditions. I found it.
- the internal gas pressure P is set to about 10 kPa to 30 kPa, and the gap length d of the discharge space 40 is set to about 0.3 to 3 mm, whereby the P ⁇ d product is obtained.
- the value is desirably about 0.3 to 9 (kPa ⁇ cm).
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Abstract
Description
図1は、本実施の形態に係るラジカルガス発生システム500の構成例を示す、断面図である。また、図2は、ラジカルガス生成装置100内に配設されている、放電セル70の構成を示す拡大断面図である。
2 第一の誘電体
3 第二の誘電体
4 スペーサ
5 高電圧電極ブロック
9 交流高電圧電源
31 高電圧電極
40 放電空間
70 放電セル
101 原料ガス供給部
102 開口部
100 ラジカルガス生成装置
200 処理チャンバー装置
201 テーブル
202 被処理体
203 ガス排出部
300 真空ポンプ
500 ラジカルガス発生システム
G1 原料ガス
G2 ラジカルガス
Claims (6)
- 誘電体バリア放電を利用して、原料ガス(G1)からラジカルガス(G2)を生成する、ラジカルガス生成装置(100)と、
前記ラジカルガス生成装置に接続されており、内部に被処理体(202)が配設されており、当該被処理体に対して前記ラジカルガスを利用した処理が実施される、処理チャンバー装置(200)とを、備えており、
前記処理チャンバー装置は、
前記被処理体が載置され、当該被処理体を回転させる、テーブル(201)を、有しており、
前記ラジカルガス生成装置は、
前記誘電体バリア放電を発生させる、複数の放電セル(70)と、
前記原料ガスを、当該ラジカルガス生成装置内に供給する、原料ガス供給部(101)とを、有しており、
前記放電セルは、
第一の電極部材(5,31)を有する第一の電極部(3,5,31)と、
前記第一の電極と対抗して配設され、第二の電極部材(1)を有する第二の電極部(1,2)と、
前記処理チャンバー装置内と接続され、前記テーブル上に配設された前記被処理体と面しており、前記誘電体バリア放電により前記原料ガスから生成された前記ラジカルガスを出力する、開口部(102)とを、有しており、
平面視において、前記回転の中心位置から遠くに配設されている前記放電セルほど、前記第一の電極部材と前記第二の電極部材とが対面している領域である対面面積を大きくする、
ことを特徴とするラジカルガス発生システム。 - 前記放電セルは、
前記誘電体バリア放電が発生する放電空間に面して配設されている誘電体(2,3)を、さらに有しており、
前記誘電体は、
単結晶サファイヤまたは石英から構成されている、
ことを特徴とする請求項1に記載のラジカルガス発生システム。 - 前記ラジカルガス生成装置において、
内部のガス圧力は、
10kPa~30kPaであり、
前記第一の電極部と前記第二の電極部との距離は、
0.3~3mmである、
ことを特徴とする請求項1に記載のラジカルガス発生システム。 - 前記原料ガスは、
窒素ガスであり、
前記ラジカルガス生成装置は、
前記窒素ガスから、前記ラジカルガスとして、窒素ラジカルガスを生成し、
前記処理チャンバー装置は、
前記窒素ラジカルガスを利用して、前記被処理体に対して、窒化膜を成膜させる、
ことを特徴とする請求項1に記載のラジカルガス発生システム。 - 前記原料ガスは、
オゾンガスもしくは酸素ガス、
前記ラジカルガス生成装置は、
前記オゾンガスもしくは酸素ガスから、前記ラジカルガスとして、酸素ラジカルガスを生成し、
前記処理チャンバー装置は、
前記酸素ラジカルガスを利用して、前記被処理体に対して、酸化膜を成膜させる、
ことを特徴とする請求項1に記載のラジカルガス発生システム。 - 前記原料ガスは、
水素ガスもしくは水蒸気ガスであり、
前記ラジカルガス生成装置は、
前記水素ガスもしくは水蒸気ガスから、前記ラジカルガスとして、水素ラジカルガスもしくはOHラジカルガスを生成し、
前記処理チャンバー装置は、
前記水素ラジカルガスもしくはOHラジカルガスを利用して、前記被処理体に対して、水素結合を促進させた金属膜を成膜させる、
ことを特徴とする請求項1に記載のラジカルガス発生システム。
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US15/506,063 US10450654B2 (en) | 2014-07-25 | 2014-10-29 | Radical gas generation system |
JP2016535624A JP6224247B2 (ja) | 2014-07-25 | 2014-10-29 | ラジカルガス発生システム |
EP14898292.9A EP3193566B1 (en) | 2014-07-25 | 2014-10-29 | Radical gas generation system |
CN201480082514.4A CN106797698B (zh) | 2014-07-25 | 2014-10-29 | 原子团气体产生系统 |
KR1020177007574A KR101913978B1 (ko) | 2014-07-25 | 2014-10-29 | 라디칼 가스 발생 시스템 |
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US11532458B2 (en) * | 2018-05-30 | 2022-12-20 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Active gas generation apparatus |
WO2023105682A1 (ja) * | 2021-12-08 | 2023-06-15 | 東芝三菱電機産業システム株式会社 | 活性ガス生成装置 |
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WO2019138453A1 (ja) * | 2018-01-10 | 2019-07-18 | 東芝三菱電機産業システム株式会社 | 活性ガス生成装置及び成膜処理装置 |
CN110677970B (zh) * | 2019-08-19 | 2023-08-01 | 西安交通大学 | 基于混合型等离子体结构的平板式等离子体发生装置 |
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