WO2019088204A1 - 静電チャックアセンブリ、静電チャック及びフォーカスリング - Google Patents
静電チャックアセンブリ、静電チャック及びフォーカスリング Download PDFInfo
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- WO2019088204A1 WO2019088204A1 PCT/JP2018/040590 JP2018040590W WO2019088204A1 WO 2019088204 A1 WO2019088204 A1 WO 2019088204A1 JP 2018040590 W JP2018040590 W JP 2018040590W WO 2019088204 A1 WO2019088204 A1 WO 2019088204A1
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- focus ring
- mounting surface
- wafer
- electrostatic chuck
- electrode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—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
- H01L21/683—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 for supporting or gripping
- H01L21/6831—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 for supporting or gripping using electrostatic chucks
- H01L21/6833—Details of electrostatic chucks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/15—Devices for holding work using magnetic or electric force acting directly on the work
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/32623—Mechanical discharge control means
- H01J37/32642—Focus rings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/32715—Workpiece holder
- H01J37/32724—Temperature
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- 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
- H01L21/67098—Apparatus for thermal treatment
- H01L21/67103—Apparatus for thermal treatment mainly by conduction
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- H—ELECTRICITY
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- 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
- H01L21/67098—Apparatus for thermal treatment
- H01L21/67109—Apparatus for thermal treatment mainly by convection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—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
- H01L21/67126—Apparatus for sealing, encapsulating, glassing, decapsulating or the like
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—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
- H01L21/683—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 for supporting or gripping
- H01L21/6831—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 for supporting or gripping using electrostatic chucks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—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
- H01L21/683—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 for supporting or gripping
- H01L21/687—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68735—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by edge profile or support profile
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- 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
- H01L21/683—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 for supporting or gripping
- H01L21/687—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/6875—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by a plurality of individual support members, e.g. support posts or protrusions
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- H—ELECTRICITY
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- 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
- H01L21/683—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 for supporting or gripping
- H01L21/687—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68757—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by a coating or a hardness or a material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—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
- H01L21/683—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 for supporting or gripping
- H01L21/687—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68785—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by the mechanical construction of the susceptor, stage or support
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N13/00—Clutches or holding devices using electrostatic attraction, e.g. using Johnson-Rahbek effect
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/002—Cooling arrangements
Definitions
- the present invention relates to an electrostatic chuck assembly, an electrostatic chuck and a focus ring.
- plasma processing apparatuses such as a plasma etching apparatus, a plasma CVD apparatus, and a plasma ashing apparatus are known.
- a wafer mounting apparatus for mounting a wafer in a vacuum chamber is usually installed.
- the wafer mounting apparatus includes an electrostatic chuck for attracting and fixing a wafer to be subjected to plasma processing to a wafer mounting surface, and a cooling plate for cooling the electrostatic chuck.
- an insulator or a dielectric (mostly ceramic) in which an internal electrode is embedded is used as the electrostatic chuck.
- a replaceable focus ring may be installed on the outer periphery of the wafer mounting surface.
- the focus ring is mounted on the focus ring mounting surface lower than the wafer mounting surface, and has a role of stably generating plasma up to the outer peripheral edge of the wafer and a role of protecting the surface of the electrostatic chuck.
- the wafer suctioned and fixed to the electrostatic chuck is cooled by the cooling plate via the electrostatic chuck.
- the temperature increase may be excessive because the focus ring is not sufficiently absorbed by the electrostatic chuck, which causes the temperature of the outer peripheral edge of the wafer to be high. The yield may be degraded.
- Patent Document 1 in the electrostatic chuck made of aluminum alumite, the specific resistances of the dielectric used on the wafer mounting surface and the dielectric used on the focus ring mounting surface are different, and the wafer is adsorbed by the Coulomb force. , Johnson ⁇ Rahbek has attracted the focus ring. Further, in Patent Document 2, an electrode for attracting the focus ring is provided in the same ceramic separately from the electrode for attracting the wafer, and only the chuck voltage applied to the electrode for attracting the focus ring is changed according to the process of plasma processing. In the etching process in which the focus ring tends to have a high temperature, the chucking voltage is increased to increase the adsorption force.
- Patent Documents 1 and 2 disclose that helium gas is supplied between the focus ring mounting surface and the focus ring to facilitate heat transfer between the focus ring mounting surface and the focus ring. ing.
- the helium gas supplied between the focus ring mounting surface and the focus ring does not stay between the focus ring mounting surface and the focus ring and leaks to the periphery thereof. In some cases, heat transfer by helium gas may not be performed sufficiently. Therefore, it has been desired to suppress such gas leakage.
- the present invention has been made to solve such a problem, and an electrostatic chuck assembly capable of suppressing leakage of gas supplied between a focus ring mounting surface and the focus ring to the periphery thereof.
- the main object is to provide an electrostatic chuck and a focus ring.
- the electrostatic chuck assembly of the present invention A ceramic body having a focus ring mounting surface lower than the wafer mounting surface which is a circular surface on the outer peripheral portion of the wafer mounting surface; A first electrode embedded at a position facing the wafer mounting surface in the inside of the ceramic body; A second electrode embedded in the ceramic body at a position facing the focus ring mounting surface; An uneven area for gas storage provided on the surface of the focus ring mounting surface; A focus ring mounted on the focus ring mounting surface; A pair of elastic annular sealing materials disposed on the inner peripheral side and the outer peripheral side of the focus ring mounting surface so as to surround the uneven area between the focus ring mounting surface and the focus ring; Is provided.
- the electrostatic chuck assembly When the electrostatic chuck assembly is used, a voltage is applied to each of the first electrode and the second electrode with the wafer mounted on the wafer mounting surface. Then, the wafer is adsorbed on the wafer mounting surface, and the focus ring is adsorbed on the focus ring mounting surface.
- the adsorption force for adsorbing the focus ring to the focus ring mounting surface may be either Coulomb force or Johnson-Rahbeck force, but Johnson-Rahbeck force is preferable.
- the focus ring is thicker than a wafer, so it is difficult to correct the warping and adsorption, but since the elastic annular seal material absorbs the warping of the focus ring, the focus ring can be firmly attracted to the focus ring mounting surface.
- the uneven region of the focus ring mounting surface becomes airtight or nearly airtight by the elastic annular sealing material and the focus ring, and the leakage of the gas supplied to the uneven region can be suppressed. Furthermore, since the first electrode and the second electrode are independent, voltages suitable for each can be applied.
- the elastic annular sealing material may be fitted in an annular groove provided in at least one of the focus ring mounting surface and the focus ring.
- the elastic annular seal material can be easily set using the annular groove.
- the elastic annular sealing material may be sandwiched between the flat portion of the focus ring mounting surface and the flat portion of the focus ring without being fitted into the annular groove. In that case, the elastic annular seal material may be bonded to at least one of the focus ring mounting surface and the focus ring with an adhesive.
- the electrostatic chuck of the present invention is A ceramic body having a focus ring mounting surface lower than the wafer mounting surface which is a circular surface on the outer peripheral portion of the wafer mounting surface; A first electrode embedded at a position facing the wafer mounting surface in the inside of the ceramic body; A second electrode embedded in the ceramic body at a position facing the focus ring mounting surface; An uneven area for gas storage provided on the surface of the focus ring mounting surface; A pair of annular grooves provided on the inner and outer peripheral sides of the surface of the focus mounting surface so as to surround the uneven area; Is provided.
- the wafer When using this electrostatic chuck, the wafer is placed on the wafer placement surface, the elastic annular seal material is fitted in the pair of annular grooves on the focus ring placement surface, and then the focus ring is placed on it. Voltage is applied to each of the first electrode and the second electrode. Then, the wafer is adsorbed on the wafer mounting surface, and the focus ring is adsorbed on the focus ring mounting surface.
- the adsorption force for adsorbing the focus ring to the focus ring mounting surface may be either Coulomb force or Johnson-Rahbeck force, but Johnson-Rahbeck force is preferable.
- the focus ring is thicker than the wafer, so it is difficult to correct the warping and adsorption, but the elastic ring seal material inserted in the pair of annular grooves on the focus ring mounting surface absorbs the warp of the focus ring. It can be firmly attracted to the focus ring mounting surface. As a result, the uneven area of the focus ring mounting surface becomes airtight or nearly airtight by the elastic annular seal member fitted in the pair of annular grooves and the focus ring, and the leakage of the gas supplied to the uneven area is suppressed it can. Furthermore, since the first electrode and the second electrode are independent, voltages suitable for each can be applied.
- the main body of the ceramic body excluding the portion between the focus ring mounting surface and the second electrode has a volume resistivity capable of exerting a coulomb force.
- the sub-body which is a portion between the focus ring mounting surface and the second electrode is formed of a second ceramic member having a volume resistivity capable of exhibiting Johnson-Laerbeck force. It may be done.
- the electrostatic chuck when used, the wafer is attracted to the wafer mounting surface by the coulomb force, and the focus ring is adsorbed to the focus ring mounting surface by the Johnson-Rahbek force stronger than the coulomb force.
- the Johnson-Rahbeck force is strong in adsorption power, so it is possible to correct the curvature of the focus ring and adsorb it on the focus ring mounting surface.
- the volume resistivity of the first ceramic member is 1 ⁇ 10 15 ⁇ cm or more at the operating temperature
- the volume resistivity of the second ceramic member is at the operating temperature It is preferably 1 ⁇ 10 8 ⁇ cm or more and 1 ⁇ 10 13 ⁇ cm or less.
- the first ceramic member can easily exert the coulomb force
- the second ceramic member can easily exert the Johnson-Rahbeck force.
- the operating temperature is a temperature at which the wafer is subjected to plasma processing, and is appropriately set, for example, between ⁇ 100 ° C. and 150 ° C., and generally set between room temperature and 150 ° C.
- the volume resistivity of the second ceramic member may be 1 ⁇ 10 8 ⁇ cm or more and 1 ⁇ 10 11 ⁇ cm or less at the operating temperature.
- the second ceramic member is preferably formed of a ceramic doped with a periodic table 4 element.
- a periodic table 4 element include titanium, zirconium, hafnium and the like.
- the doping amount of the periodic table group 4 element may be appropriately set within such a range that the volume resistivity of the second ceramic member becomes 1 ⁇ 10 8 ⁇ cm or more and 1 ⁇ 10 13 ⁇ cm or less at the operating temperature.
- the second ceramic member doped with the periodic table group 4 element preferably has the same main component as the first ceramic member. By so doing, the thermal conductivity and the thermal expansion coefficient can be made comparable to those of the first ceramic member.
- the thickness variation of the second ceramic member is preferably 0.5 mm or less. In this case, dielectric breakdown does not easily occur because the second ceramic member does not have an excessively thin portion. In addition, since the second ceramic member does not have an excessively thick portion, the time required for the static elimination becomes relatively short.
- the second electrode is preferably a bipolar electrode. This makes it easy to remove electricity or the like in order to prevent desorption problems and the like caused by residual charges that often occur in Johnson-Larbeck-type electrostatic chucks.
- the focus ring of the present invention is A focus ring mounted on the focus ring mounting surface of the electrostatic chuck, A pair of annular grooves provided on the inner peripheral side and the outer peripheral side of the surface of the focus ring on the side to be mounted on the electrostatic chuck; The pair of annular grooves are provided at positions that can surround the inner peripheral side and the outer peripheral side of the uneven area for gas storage provided on the focus ring mounting surface. It is a thing.
- the focus ring When using this focus ring, the focus ring is placed on the focus ring with the focus ring placed on the focus ring placement surface of the electrostatic chuck after the elastic annular seal material is fitted in the pair of annular grooves of the focus ring.
- the surface is attracted by electrostatic force (Coulomb or Johnson-Rahbeck force).
- the focus ring is thicker than the wafer, so it is difficult to correct the warping and adsorption, but since the elastic annular seal material inserted in the pair of annular grooves of the focus ring absorbs the warp of the focus ring, the focus ring is placed on the focus ring It can be firmly attached to the mounting surface.
- the uneven area of the focus ring mounting surface becomes airtight or nearly airtight by the elastic annular seal member fitted in the pair of annular grooves and the focus ring, and the leakage of the gas supplied to the uneven area is suppressed. it can.
- FIG. 10 is a longitudinal sectional view of the wafer mounting device 10 disposed in a chamber 80.
- FIG. 2 is a partial enlarged view of the electrostatic chuck assembly 15 of FIG. 1;
- FIG. 14 is an explanatory view showing an assembly procedure of the electrostatic chuck assembly 15;
- FIG. 16 is a partially enlarged view of another example of the electrostatic chuck assembly 15;
- FIG. 16 is a partially enlarged view of another example of the electrostatic chuck assembly 15;
- FIG. 16 is a partially enlarged view of another example of the electrostatic chuck assembly 15;
- FIG. 16 is a partially enlarged view of another example of the electrostatic chuck assembly 15;
- FIG. 16 is a partially enlarged view of another example of the electrostatic chuck assembly 15;
- FIG. 1 is a longitudinal sectional view of a wafer mounting apparatus 10 disposed in a chamber 80
- FIG. 2 is a partially enlarged view of the electrostatic chuck assembly 15 of FIG. 1
- FIG. 3 is an assembly procedure of the electrostatic chuck assembly 15.
- the wafer mounting apparatus 10 is an apparatus that performs etching, CVD, etc. on the wafer W using plasma, and is fixed to the bottom surface of the chamber 80 for semiconductor processing and used.
- the wafer mounting apparatus 10 includes the electrostatic chuck assembly 15 and the cooling plate 70.
- the electrostatic chuck assembly 15 includes the electrostatic chuck 20, the focus ring 50, and the pair of O-rings 60. There is.
- the electrostatic chuck 20 is provided with a disc-shaped ceramic body 22.
- the ceramic body 22 has a circular wafer mounting surface 22a on which the wafer W is to be mounted, and an annular focus ring (F) which is formed one step lower than the wafer mounting surface 22a on the outer periphery of the wafer mounting surface 22a. / R) mounting surface 28a.
- a wafer suction electrode 32 is embedded in the ceramic body 22 at a position facing the wafer mounting surface 22 a.
- the diameter of the wafer mounting surface 22 a is formed to be smaller than the diameter of the wafer W. Therefore, in a state where the wafer W is mounted on the wafer mounting surface 22a, the outer peripheral edge of the wafer W protrudes from the wafer mounting surface 22a.
- a focus ring (F / R) suction electrode 38 is provided independently of the wafer suction electrode 32 at a position facing the F / R mounting surface 28 a of the ceramic body 22.
- the ceramic body 22 is bonded to the cooling plate 70 via the bonding sheet 75 on the back surface 22b opposite to the wafer mounting surface 22a.
- the ceramic body 22 includes a first ceramic member 27 and a second ceramic member 28.
- the second ceramic member 28 is an annular portion of the ceramic body 22 above the lower surface of the F / R adsorption electrode 38, and the first ceramic member 27 is a portion of the ceramic body 22 other than the second ceramic member 28. It is.
- the first ceramic member 27 has a volume resistivity capable of exerting a coulomb force, and is a member made of a ceramic material such as aluminum nitride, silicon nitride, or aluminum oxide. If the volume resistivity is 1 ⁇ 10 15 ⁇ cm or more at a working temperature (eg, a temperature set between normal temperature and 150 ° C., the same applies hereinafter), sufficient coulomb force can be exhibited.
- the second ceramic member 28 has a volume resistivity capable of exerting Johnson-Laerbeck force, and is a member formed of a material in which the ceramic material of the first ceramic member 27 is doped with a periodic table 4 element (for example, titanium). It is. If the volume resistivity is 1 ⁇ 10 8 ⁇ cm or more and 1 ⁇ 10 13 ⁇ cm or less (preferably 1 ⁇ 10 8 ⁇ cm or more and 1 ⁇ 10 11 ⁇ cm or less) at the operating temperature, the Johnson-Rahbeck force can be sufficiently exhibited.
- the second ceramic member 28 is formed to have a thickness of 0.05 mm to 2 mm and a thickness variation of 0.5 mm or less.
- the second ceramic member 28 is a sprayed film in the present embodiment.
- the wafer mounting surface 22 a of the ceramic body 22 is provided with an uneven region 23 for storing gas.
- the uneven region 23 is provided over the entire surface of the wafer mounting surface 22a.
- a plurality of concavities and convexities are formed by embossing.
- a heat conductive gas (for example, He gas) penetrates from the back surface 22b to the wafer mounting surface 22a between the recess 23c provided in the uneven region 23 and the wafer W mounted on the wafer mounting surface 22a.
- the gas is supplied from the gas supply path 23d.
- the F / R mounting surface 28 a of the ceramic body 22 is provided with a concavo-convex area 29 for gas storage.
- the uneven area 29 is an annular area coaxial with the F / R mounting surface 28a, and a plurality of uneven areas are formed by embossing.
- a heat conductive gas e.g., He gas
- the gas supply passage 29 d is provided to penetrate from the back surface 22 b of the ceramic body 22 to the F / R mounting surface 28 a.
- the wafer suction electrode 32 is made of a conductive mesh or plate, and is provided in parallel with the wafer mounting surface 22 a (including substantially parallel cases, hereinafter the same).
- the back surface of the wafer suction electrode 32 is connected to a feed rod (not shown) inserted from the back surface 22 b of the ceramic body 22. A direct current voltage is applied to the wafer suction electrode 32 through the feed rod.
- the F / R adsorption electrode 38 is a bipolar electrode manufactured in a conductive print pattern, and the comb-tooth electrodes forming a pair are provided on the surface of the annular step surface 24 a with a gap.
- the back surface of the F / R adsorption electrode 38 is connected to a feed rod (not shown) inserted from the back surface 22 b of the ceramic body 22. A direct current voltage is applied to the F / R adsorption electrode 38 through the feed rod.
- the focus ring 50 is, for example, a member made of metal silicon, and has a ring main body 52 mounted on the F / R mounting surface 28 a of the electrostatic chuck 20. At the upper end portion of the ring main body 52, an annular step surface 52a having an L-shaped cross section is formed along the inner periphery. The annular step surface 52 a is formed to have an outer diameter slightly larger than the diameters of the wafer W and the wafer mounting surface 22 a so as not to interfere with the wafer W.
- the focus ring 50 has a role of protecting the wafer W and the electrostatic chuck 20. The focus ring 50 is simply mounted on the F / R mounting surface 28 a without being bonded to the F / R mounting surface 28 a.
- the material of the focus ring 50 is appropriately selected according to the type of the film to be etched of the wafer W when the plasma processing is plasma etching.
- the unevenness of the F / R mounting surface 28a when mounted on the electrostatic chuck 20 As shown in FIG. 3, of the back surface 52b of the ring main body 52 (the surface on the side to be mounted on the electrostatic chuck 20), the unevenness of the F / R mounting surface 28a when mounted on the electrostatic chuck 20.
- An inner peripheral groove 55 and an outer peripheral groove 57 which are a pair of annular grooves, are provided on the inner peripheral side and the outer peripheral side of the facing area 54 facing the area 29 so as to surround the facing area 54.
- the inner circumferential groove 55 and the outer circumferential groove 57 are annular grooves coaxial with the ring main body 52, and are formed in a U-shaped cross section.
- the pair of O-rings 60 includes a small diameter O-ring 65 and a large diameter O-ring 67.
- the O-rings 65 and 67 are O-rings formed of fluorine rubber such as perfluoroether, the small diameter O ring 65 is fitted into the inner circumferential groove 55 of the focus ring 50, and the large diameter O ring 67 is the focus ring 50. It is fitted into the outer peripheral groove 57.
- the O-rings 65 and 67 absorb the warpage of the focus ring 50 to firmly adsorb the focus ring 50 to the F / R mounting surface 28a, and the gas supplied to the uneven region 29 of the F / R mounting surface 28a Plays a role in suppressing the leakage of
- the cooling plate 70 is a disk-shaped plate made of metal typified by aluminum or aluminum alloy, and includes a refrigerant passage 72 through which a refrigerant can circulate.
- the refrigerant passage 72 is connected to the refrigerant supply passage and the refrigerant discharge passage which penetrate the chamber 80, and the refrigerant discharged from the refrigerant discharge passage is returned to the refrigerant supply passage again after temperature adjustment.
- the electrostatic chuck 20 the electrostatic chuck 20, the focus ring 50, and the O-rings 65 and 67 described above are prepared. Then, the small diameter O ring 65 is fitted into the inner circumferential groove 55 of the focus ring 50, and the large diameter O ring 67 is fitted into the outer circumferential groove 57. Thereafter, the focus ring 50 into which the O-rings 65 and 67 are fitted is placed on the F / R mounting surface 28 a of the electrostatic chuck 20.
- the wafer mounting apparatus 10 provided with the electrostatic chuck assembly 15 is used by being fixed to the bottom surface of the chamber 80.
- a shower head 90 for discharging a process gas from the plurality of gas injection holes into the chamber 80 is disposed on the ceiling surface of the chamber 80.
- the disk-shaped wafer W is mounted on the wafer mounting surface 22 a of the electrostatic chuck 20.
- the wafer W is electrostatically attracted to the wafer mounting surface 22 a by the Coulomb force when a voltage is applied to the wafer attracting electrode 32.
- the temperature of the wafer W can be controlled by adjusting the temperature of the refrigerant supplied to the refrigerant passage 72 of the cooling plate 70. At this time, He gas is supplied between the wafer W and the recess 23 c of the wafer mounting surface 22 a to improve heat conduction.
- the temperature control of the wafer W is executed by detecting the temperature of the wafer by a temperature detection sensor (not shown) and feeding back the temperature to a target temperature.
- An annular focus ring 50 is mounted on the F / R mounting surface 28 a of the electrostatic chuck 20.
- the focus ring 50 is electrostatically attracted to the F / R mounting surface 28 a by the Johnson-Rahbeck force when a voltage is applied to the F / R adsorption electrode 38.
- the focus ring 50 can be controlled by adjusting the temperature of the refrigerant supplied to the refrigerant passage 72 of the cooling plate 70. At this time, He gas is supplied between the focus ring 50 and the recess 29 c of the F / R mounting surface 28 a to improve the heat conduction.
- the temperature control of the focus ring 50 is executed by detecting the temperature of the focus ring 50 by a temperature detection sensor (not shown) and performing feedback so that the temperature becomes the target temperature.
- the inside of the chamber 80 is set to be a predetermined vacuum atmosphere (or a reduced pressure atmosphere), and high frequency power is supplied between the cooling plate 70 and the shower head 90 while supplying the process gas from the shower head 90 And generate plasma. Then, CVD film formation or etching is performed on the wafer using the plasma.
- the focus ring 50 is also consumed. However, since the focus ring 50 is thick, replacement of the focus ring 50 is performed after processing a plurality of wafers W.
- the ceramic body 22 of the present embodiment corresponds to the ceramic body of the present invention
- the wafer adsorption electrode 32 corresponds to the first electrode
- the F / R adsorption electrode 38 corresponds to the second electrode.
- the pair of O-rings 60 correspond to a pair of elastic annular seal members.
- the wafer adsorption electrode 32 and the F / R adsorption with the wafer W mounted on the wafer mounting surface 22a A voltage is applied to each of the electrodes 38.
- the wafer W is adsorbed to the wafer mounting surface 22 a
- the focus ring 50 is adsorbed to the F / R mounting surface 28 a.
- the focus ring 50 is thicker than the wafer W, so it is difficult to correct the warp and adsorb it, but since the O-rings 65 and 67 absorb the warp of the focus ring 50, the focus ring 50 is firmly fixed to the F / R mounting surface 28a.
- the uneven region 29 of the F / R mounting surface 28 a becomes airtight or nearly airtight by the O-rings 65 and 67 and the focus ring 50, and leakage of the gas supplied to the uneven region 29 can be suppressed. Therefore, in the wafer mounting apparatus 10 having the electrostatic chuck assembly 15 or the electrostatic chuck 20, the focus ring 50 can be sufficiently cooled by utilizing the heat conduction of the gas supplied to the uneven area 29. Furthermore, since the wafer adsorption electrode 32 and the F / R adsorption electrode 38 are independent of each other, voltages suitable for each can be applied.
- the O-rings 65, 67 are formed using the grooves 55, 57. It can be easily set.
- the first ceramic member 27 is made of a material having a volume resistivity capable of exerting a coulomb force
- the second ceramic member 28 is Johnson.
- -It is comprised with the material which has the volume resistivity which can exhibit the Rahbeck force. Therefore, when the electrostatic chuck 20 is used, the wafer W is attracted to the wafer placement surface 22a by the coulomb force, and the focus ring 50 is attracted to the R / F placement surface 28a by the Johnson-Rahbek force stronger than the coulomb force. Ru. Since the Johnson-Rahbeck force is strong in adsorption force, it is possible to correct the warp of the focus ring 50 and adsorb it to the F / R mounting surface 28a.
- the volume resistivity of the first ceramic member 27 is 1 ⁇ 10 15 ⁇ cm or more
- the volume resistivity of the second ceramic member 28 is 1 ⁇ 10 8 ⁇ cm or more and 1 ⁇ 10 13 ⁇ cm or less. Therefore, the first ceramic member 27 easily exerts the coulomb force, and the second ceramic member 28 easily exerts the Johnson-Rahbek force.
- the second ceramic member 28 is formed of a ceramic doped with a periodic table 4 element, and such a ceramic is suitable for thermal spraying.
- the thickness variation of the second ceramic member 28 is 0.5 mm or less, there is no part that is too thin in the second ceramic member 28, so dielectric breakdown does not easily occur. .
- the second ceramic member 28 does not have an excessively thick portion, the time required for the static elimination can be relatively shortened.
- the second ceramic member 28 is a sprayed film, the second ceramic member 28 can be formed relatively easily. Further, since the second ceramic member 28 is a material whose main component is the same as the ceramic material of the first ceramic member 27, the thermal conductivity, the thermal expansion coefficient, and the like can be made comparable to the first ceramic member 27.
- the small diameter O ring 65 and the large diameter O ring 67 are respectively fitted in the inner circumferential groove 55 and the outer circumferential groove 57 provided on the back surface 52b of the focus ring 50, but as shown in FIG.
- the small diameter O ring 65 and the large diameter O ring 67 may be fitted into the inner circumferential groove 125 and the outer circumferential groove 127 provided on the F / R mounting surface 28 a by making the back surface 52 b of the ring 50 flat.
- the back surface 52b of the focus ring 50 is made flat, and the area other than the concavo-convex area 29 of the F / R mounting surface 28a is also made flat.
- the small-diameter O-ring 65 and the large-diameter O-ring 67 may be sandwiched between regions other than the uneven region 29 of the mounting surface 28 a.
- the small diameter O-ring 65 is disposed in the L-shaped notch groove 255 provided along the inner periphery of the back surface 52b of the focus ring 50, and the F / R mounting surface 28a
- the large diameter O-ring 67 may be disposed in the L-shaped notch groove 227 provided along the outer periphery.
- the U-shaped annular groove such as the inner circumferential groove 55 of FIG. 2 or the outer circumferential groove 127 of FIG. 4 may be formed instead of the notch groove 255 or the notch groove 227.
- a shallow inner circumferential groove 355 and an outer circumferential groove 357 are provided on the back surface 52b of the focus ring 50, and a depth is also provided on the F / R mounting surface opposite to those grooves.
- a shallow inner circumferential groove 325 and an outer circumferential groove 327 may be provided, the small diameter O-ring 65 may be fitted into both inner circumferential grooves 355, 325, and the large diameter O ring 67 may be fitted into both outer circumferential grooves 357, 327.
- the ceramic body 22 is configured of the first ceramic member 27 and the second ceramic member 28.
- the ceramic body 22 may be integrally formed of the material of the first ceramic member 27. In this way, the focus ring 50 is attracted to the F / R mounting surface 28 a by the Coulomb force.
- the annular step surface 52a is formed at the upper end portion of the ring main body 52, but the annular step surface 52a may be omitted. Further, on the outer peripheral side of the focus ring, a skirt portion extending downward from the back surface 52b of the ring main body 52 may be formed.
- the O-ring is used as the elastic annular sealing material, but the sealing material is not particularly limited as long as it is a low Young's modulus sealing material, and various packings can be used.
- the elastic annular sealing material is formed of fluorine rubber, it may be formed of an elastic material, for example, may be formed of fluorine resin, or silicone resin or silicone rubber. It may be formed.
- the elastic annular seal material may be used by adhering to the electrostatic chuck 20 or the focus ring 50.
- the thermal spray coating is used as the second ceramic member 28.
- the thermal spray coating may be replaced by a coating produced using another coating technique such as an aerosol deposition method.
- thermal spraying and these coating methods since the thickness can be controlled with relatively high accuracy, it is easy to obtain a film exhibiting a desired adsorption power, and the obtained film is also suitable for securing insulation.
- various thermal spraying methods such as a cold spray method and a suspension plasma thermal spraying method can be adopted as the thermal spraying method.
- the F / R adsorption electrode 38 is a bipolar electrode, but may be a monopolar electrode. Further, in the embodiment described above, the wafer suction electrode 32 may be a single electrode or a bipolar electrode. The F / R adsorption electrode 38 may be the same as the wafer adsorption electrode 32.
- a radio frequency (RF) electrode or a heater electrode may be embedded at a position facing the wafer mounting surface 22 a in the ceramic body 22.
- the RF electrode is made of a conductive mesh and is provided in parallel with the wafer mounting surface 22a.
- the back surface of the RF electrode is connected to a feed rod (not shown) inserted from the back surface 22 b of the ceramic body 22.
- An RF voltage is applied to the RF electrode through the feed rod.
- the heater electrode is a resistive heating element made of an electrically conductive coil or printed pattern, and extends from one end to the other in a single stroke like manner across the entire area facing the wafer mounting surface 22a parallel to the wafer mounting surface 22a. Wired.
- One end and the other end of the heater electrode are connected to a pair of feed rods inserted from the back surface 22 b of the ceramic body 22.
- a voltage is applied to the heater electrode through the feed rod.
- an RF electrode or a heater electrode may be embedded at a position facing the F / R mounting surface 28 a in the inside of the ceramic body 22.
- the cooling plate 70 is bonded to the back surface 22b of the electrostatic chuck 20 by the bonding sheet 75.
- the cooling plate 70 may be bonded to the back surface 22 b of the electrostatic chuck 20 by TCB (thermal compression bonding).
- TCB refers to a method in which a metal bonding material is sandwiched between two members to be bonded, and the two members are pressure bonded in a state of being heated to a temperature equal to or less than the solidus temperature of the metal bonding material.
- lift pins may be provided to move the wafer W up and down.
- the insertion holes for inserting the lift pins may be provided to penetrate the chamber 80, the cooling plate 70, the bonding sheet 75, and the electrostatic chuck 20.
- high frequency power is supplied between the cooling plate 70 and the shower head 90 to generate plasma, but electrostatic electrodes such as the wafer adsorption electrode 32 and the F / R adsorption electrode 38 and the shower are generated.
- a high frequency power may be supplied to the head 90 to generate plasma.
- an RF electrode may be further provided, and high frequency power may be supplied between the RF electrode and the shower head 90 to generate plasma.
- the present invention is applicable to a semiconductor manufacturing apparatus, and is particularly suitable for a semiconductor manufacturing apparatus used for a plasma etching process in which power is advanced.
Abstract
Description
円形表面であるウエハ載置面と比べて低位のフォーカスリング載置面を前記ウエハ載置面の外周部に有するセラミック体と、
前記セラミック体の内部のうち前記ウエハ載置面に対向する位置に埋設された第1電極と、
前記セラミック体の内部のうち前記フォーカスリング載置面に対向する位置に埋設された第2電極と、
前記フォーカスリング載置面の表面に設けられたガス溜め用の凹凸領域と、
前記フォーカスリング載置面に載置されたフォーカスリングと、
前記フォーカスリング載置面と前記フォーカスリングとの間であって前記凹凸領域を囲うように前記フォーカスリング載置面の内周側及び外周側に配置された一対の弾性環状シール材と、
を備えたものである。
円形表面であるウエハ載置面と比べて低位のフォーカスリング載置面を前記ウエハ載置面の外周部に有するセラミック体と、
前記セラミック体の内部のうち前記ウエハ載置面に対向する位置に埋設された第1電極と、
前記セラミック体の内部のうち前記フォーカスリング載置面に対向する位置に埋設された第2電極と、
前記フォーカスリング載置面の表面に設けられたガス溜め用の凹凸領域と、
前記フォーカス載置面の表面のうち前記凹凸領域を囲うように内周側及び外周側に設けられた一対の環状溝と、
を備えたものである。
静電チャックのフォーカスリング載置面に載置されるフォーカスリングであって、
前記フォーカスリングのうち前記静電チャックに載置される側の面の内周側及び外周側に設けられた一対の環状溝
を備え、
前記一対の環状溝は、前記フォーカスリング載置面に設けられたガス溜め用の凹凸領域の内周側と外周側とを囲うことが可能な位置に設けられている、
ものである。
Claims (4)
- 円形表面であるウエハ載置面と比べて低位のフォーカスリング載置面を前記ウエハ載置面の外周部に有するセラミック体と、
前記セラミック体の内部のうち前記ウエハ載置面に対向する位置に埋設された第1電極と、
前記セラミック体の内部のうち前記フォーカスリング載置面に対向する位置に埋設された第2電極と、
前記フォーカスリング載置面の表面に設けられたガス溜め用の凹凸領域と、
前記フォーカスリング載置面に載置されたフォーカスリングと、
前記フォーカスリング載置面と前記フォーカスリングとの間であって前記凹凸領域を囲うように前記フォーカスリング載置面の内周側及び外周側に配置された一対の弾性環状シール材と、
を備えた静電チャックアセンブリ。 - 前記弾性環状シール材は、前記フォーカスリング載置面及び前記フォーカスリングの少なくとも一方に設けられた環状溝に嵌め込まれている、
請求項1に記載の静電チャックアセンブリ。 - 円形表面であるウエハ載置面と比べて低位のフォーカスリング載置面を前記ウエハ載置面の外周部に有するセラミック体と、
前記セラミック体の内部のうち前記ウエハ載置面に対向する位置に埋設された第1電極と、
前記セラミック体の内部のうち前記フォーカスリング載置面に対向する位置に埋設された第2電極と、
前記フォーカスリング載置面の表面に設けられたガス溜め用の凹凸領域と、
前記フォーカス載置面の表面のうち前記凹凸領域を囲うように内周側及び外周側に設けられた一対の環状溝と、
を備えた静電チャック。 - 静電チャックのフォーカスリング載置面に載置されるフォーカスリングであって、
前記フォーカスリングのうち前記静電チャックに載置される側の面の内周側及び外周側に設けられた一対の環状溝
を備え、
前記一対の環状溝は、前記フォーカスリング載置面に設けられたガス溜め用の凹凸領域の内周側と外周側とを囲うことが可能な位置に設けられている、
フォーカスリング。
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CN201880067044.2A CN111226309B (zh) | 2017-11-06 | 2018-10-31 | 静电卡盘组件、静电卡盘及聚焦环 |
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TWI805051B (zh) * | 2020-11-05 | 2023-06-11 | 大陸商北京北方華創微電子裝備有限公司 | 承載裝置及半導體反應腔室 |
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JPWO2019088204A1 (ja) | 2020-11-19 |
TW201933530A (zh) | 2019-08-16 |
CN111226309B (zh) | 2023-09-19 |
JP6894000B2 (ja) | 2021-06-23 |
US11610798B2 (en) | 2023-03-21 |
US20200251371A1 (en) | 2020-08-06 |
TWI761621B (zh) | 2022-04-21 |
KR20200052973A (ko) | 2020-05-15 |
CN111226309A (zh) | 2020-06-02 |
KR102387008B1 (ko) | 2022-04-18 |
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