WO2010132640A2 - Electrostatic chuck with polymer protrusions - Google Patents
Electrostatic chuck with polymer protrusions Download PDFInfo
- Publication number
- WO2010132640A2 WO2010132640A2 PCT/US2010/034667 US2010034667W WO2010132640A2 WO 2010132640 A2 WO2010132640 A2 WO 2010132640A2 US 2010034667 W US2010034667 W US 2010034667W WO 2010132640 A2 WO2010132640 A2 WO 2010132640A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrostatic chuck
- polymer
- chuck according
- layer
- charge control
- Prior art date
Links
Classifications
-
- 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
-
- 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
-
- 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
- H01L21/6875—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
-
- 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
Definitions
- An electrostatic chuck holds and supports a substrate during a manufacturing process and also removes heat from the substrate without mechanically clamping the substrate.
- a substrate such as a semiconductor wafer
- the substrate is separated from one or more electrodes in the face of the electrostatic chuck by a surface layer of material that covers the electrode.
- the surface layer is electrically insulating, while in a Johnsen- Rahbek electrostatic chuck, the surface layer is weakly conducting.
- the surface layer of the electrostatic chuck may be flat or may have one or more protrusions, projections or other surface features that further separate the back side of the substrate from the covered electrode.
- Heat delivered to the substrate during processing can be transferred away from the substrate and to the electrostatic chuck by contact heat conduction with the protrusions and/or by gas heat conduction with a cooling gas.
- Contact heat conduction is generally more efficient than gas heat conduction in removing heat from the substrate.
- controlling the amount of contact between the substrate and the protrusions can be difficult.
- the substrate processing it is important to be able to control the temperature of the substrate, limit the maximum temperature rise of the substrate, maintain temperature uniformity over the substrate surface, or any combination of these. If there are excessive temperature variations across the substrate surface due to poor and/or non-uniform heat transfer, the substrate can become distorted and process chemistry can be affected.
- the greater the area of direct contact with the electrostatic chuck the greater the heat transferred by contact heat conduction.
- the size of the area of direct contact is a function of the roughness, flatness and hardness of the contact surfaces of the substrate and electrostatic chuck, as well as of the applied pressure between the contact surfaces. Since the characteristics of the contact surface vary from substrate to substrate, and since the characteristics of the contact surface can change over time, accurately controlling contact heat conductance between the electrostatic chuck and substrate is difficult.
- Controlling the temperature of a substrate and the number of particles on its back side is important for reducing or eliminating damage to microelectronic devices, reticle masks and other such structures, and for reducing or minimizing manufacturing yield loss.
- the abrasive properties of the electrostatic chuck protrusions, the high contact area of roughened protrusions, and the effect of lapping and polishing operations during manufacture of electrostatic chucks may all contribute adder particles to the back side of substrates during use with an electrostatic chuck.
- an electrostatic chuck comprising a surface layer activated by a voltage in an electrode to form an electric charge to electrostatically clamp a substrate to the electrostatic chuck.
- the surface layer includes a plurality of polymer protrusions and a charge control layer to which the plurality of polymer protrusions adhere, the plurality of polymer protrusions extending to a height above portions of the charge control layer surrounding the plurality of polymer protrusions to support the substrate upon the plurality of polymer protrusions during electrostatic clamping of the substrate.
- the polymer of which the plurality of polymer protrusions are formed may comprise polyetherimide (PEI), polyimide or polyether ether ketone (PEEK).
- the charge control layer may be formed of a polymer, such as polyetherimide (PEI), polyimide or polyether ether ketone (PEEK).
- An adhesive layer may underlie the charge control layer, and may comprise polyetherimide (PEI).
- the electrostatic chuck may comprise an adhesion coating layer.
- the adhesion coating layer may comprise at least one of silicon containing nitrides, oxides, carbides and non-stoichiometric versions of these, for example but not limited to SiO x N y , silicon nitride, silicon oxide or silicon carbide.
- the adhesion coating layer may also comprise carbon or a nitride compound of carbon; and may comprise diamond-like carbon.
- the adhesion coating layer may extend to comprise a metals reduction layer surrounding at least a portion of an edge of the electrostatic chuck.
- the electrostatic chuck may comprise a ceramic to ceramic bonding layer that bonds a dielectric layer of the electrostatic chuck to an insulator layer of the electrostatic chuck, the ceramic to ceramic bonding layer comprising a polymer, such as at least one of polytetrafluoroethylene (PTFE) and modified polytetrafluoroethylene (PTFE), and/or at least one of perfluoroalkoxy (PFA), fluorinated ethylene-propylene (FEP) and polyether ether ketone (PEEK).
- the modified polytetrafluoroethylene (PTFE) may comprise at least one of perfluoroalkoxy (PFA) and fluorinated ethylene-propylene (FEP).
- the plurality of polymer protrusions may be substantially equally spaced across the surface layer as measured by center to center distance between pairs of neighboring polymer protrusions.
- the polymer protrusions may be arranged in a trigonal pattern.
- the polymer protrusions may comprise a center to center distance of between about 6 mm and about 8 mm; and may comprise a height of between about 3 microns and about 12 microns; and may comprise a diameter of about 900 microns.
- the charge control layer may comprise a surface resistivity of between about 10 ohms per square to about 10 11 ohms per square.
- the electrostatic chuck may further comprise a gas seal ring comprising a polymer, such as polyetherimide (PEI), polyimide or polyether ether ketone (PEEK).
- PEI polyetherimide
- PEEK polyether ether ketone
- the plurality of polymer protrusions may comprise a surface roughness of between about 0.02 ⁇ m and about 0.05 ⁇ m.
- a method of manufacturing an electrostatic chuck comprises bonding a dielectric layer of the electrostatic chuck to an insulator layer of the electrostatic chuck using a bonding polymer comprising at least one of polytetrafluoroethylene (PTFE), modified polytetrafluoroethylene (PTFE), perfluoroalkoxy (PFA), fluorinated ethylene-propylene (FEP) and polyether ether ketone (PEEK); coating the dielectric layer of the electrostatic chuck with an adhesion coating layer comprising at least one of silicon containing nitride, silicon containing oxide, silicon containing carbide, non-stoichiometric silicon containing nitride, non-stoichiometric silicon containing oxide, non-stoichiometric silicon containing carbide carbon and a nitride compound of carbon; bonding a charge control layer comprising a charge control layer polymer to the surface of the electrostatic chuck, the
- FIG. 1 is a cross-sectional diagram of the top layers of an electrostatic chuck in accordance with an embodiment of the invention.
- FIG. 2 is a cross-sectional diagram showing further layers of an electrostatic chuck in accordance with an embodiment of the invention.
- FIG. 3 is an illustration of a pattern of protrusions on the surface of an electrostatic chuck in accordance with an embodiment of the invention.
- FIG. 4 is a diagram of the surface appearance of an electrostatic chuck in accordance with an embodiment of the invention.
- FIG. 5 is a diagram of the profile of a protrusion on an electrostatic chuck in accordance with an embodiment of the invention.
- an electrostatic chuck that includes protrusions on its surface for mounting a substrate.
- the protrusions are formed of a polymer substance, such as polyetherimide (PEI), polyimide or polyether ether ketone (PEEK).
- the electrostatic chuck features a charge control surface layer, to which the polymer protrusions adhere.
- the charge control surface layer may be formed of the same polymer substance as the protrusions, such as polyetherimide (PEI), polyimide or polyether ether ketone (PEEK).
- Such protrusions and charge control surface layer may assist with encouraging contact of the electrostatic chuck with the substrate to promote contact cooling, while also reducing production of undesirable particles.
- FIG. 1 is a cross-sectional diagram of the top layers of an electrostatic chuck in accordance with an embodiment of the invention.
- the electrostatic chuck features protrusions 101 that are formed of a polymer, such as polyetherimide (PEI), polyimide or polyether ether ketone (PEEK).
- the gas seal rings (not shown) of the electrostatic chuck may be formed of a polymer, such as the same polymer as the protrusions 101.
- the protrusions 101 adhere to a charge control layer 102, which may also be formed of a polymer, The purpose of the charge control layer 102 is to provide a conductive layer to bleed away surface charge.
- the charge control layer 102 reduces the likelihood of "wafer sticking," which occurs when a wafer or other substrate electrostatically adheres to the chuck surface after the chuck power is removed.
- a charge control layer 102 having a surface resistivity in an appropriate range such as, for example, a range of from about 1 x 10 ohms/square to about 1 x 10 ohms/square, has been shown to reduce surface charge retention that can lead to undesirable electrostatic force and ultimately to wafer sticking.
- the slightly conductive surface layer bleeds charge to ground (not shown) while not interfering with the electrostatic attraction between the electrostatic chuck and the substrate.
- both the protrusions 101 and the charge control layer 102 are formed of a single polymer, such as polyetherimide (PEI), polyimide or polyether ether ketone (PEEK).
- An adhesive layer 103 may be underneath the charge control layer 102, and may comprise a different polymer from the charge control layer.
- the adhesive layer 103 may comprise polyetherimide (PEI).
- the adhesive layer 103 need not be present.
- the electrostatic chuck includes an adhesion coating 104 that encourages the polymer layers above it to adhere to the dielectric layer 105.
- the adhesion coating 104 stays buried under the polymer layers above it, and hides cosmetic defects in the polymers.
- the adhesion coating 104 may, for example, include silicon containing nitrides, oxides, carbides and non- stoichiometric versions of these, for example but not limited to SiO x N x , silicon nitride, silicon oxide or silicon carbide.
- the adhesion coating layer may also comprise carbon or a nitride compound of carbon; and may comprise diamond-like carbon; and/or a combination of any of the foregoing.
- Underneath the adhesion coating 104 is a dielectric layer 105, such as an alumina dielectric.
- FIG. 2 is a cross-sectional diagram showing further layers of an electrostatic chuck in accordance with an embodiment of the invention.
- the electrostatic chuck includes metal electrodes 206.
- the metal electrodes 206 are bonded to electrode pins 207 by electrically conductive epoxy bonds 208.
- the dielectric layer 205 is bonded to a insulator layer 209, such as an alumina insulator, by a ceramic to ceramic bond 210.
- the ceramic to ceramic bond 210 may be formed of a polymer, such as polytetrafluoroethylene (PTFE) or modified PTFE (which includes PFA and/or FEP in addition to PTFE).
- PTFE polytetrafluoroethylene
- modified PTFE which includes PFA and/or FEP in addition to PTFE
- the ceramic to ceramic bond 210 may be formed of polymers such as perfluoroalkoxy (PFA), fluorinated ethylene-propylene (FEP) and polyether ether ketone (PEEK).
- PFA perfluoroalkoxy
- FEP fluorinated ethylene-propylene
- PEEK polyether ether ketone
- the insulator 209 there is a thermally conductive bond 21 1 (which may be formed, for example, using TRA-CON thermally conductive epoxy, sold by TRA-CON, Inc. of Bedford, MA, U.S.A.) and a water cooled base 212.
- the adhesion coating 204 may extend down an edge of the electrostatic chuck (including down the edges of the gas seal rings) to form a metals reduction layer 213, which prevents beam strikes on the edges of the electrostatic chuck from causing aluminum particles to strike the substrate.
- the polyetherimide (PEI) used for the protrusions 201, charge control layer 202 or other components of the electrostatic chuck may be formed of unfilled amorphous polyether imide (PEI), in a thickness of between about 12 microns and about 25 microns.
- PEI unfilled amorphous polyether imide
- PEI sold under the tradename ULTEM 1000 may be used, sold by Sabic Innovative Plastics Holdings BV.
- the protrusions 201 and/or charge control layer 202 or other components are formed of polyether ether ketone (PEEK), they may be made from unfilled PEEK, in a thickness of between about 12 microns and about 25 microns.
- PEEK sold under the trade name Victrex® APTIV PEEKTM FILM, 2000-006 (unfilled amorphous grade) may be used, sold by Victrex U.S.A., Inc. of West Conshohocken, PA, U.S.A.
- An electrostatic chuck featuring polymer protrusions and a polymer charge control layer in accordance with an embodiment of the invention may include features of the electrostatic chuck of U.S. Patent App. No. 12/454,336, filed on May 15, 2009, published as U.S. Patent Application Publication No. 2009/0284894, the teachings of which are hereby incorporated by reference in their entirety.
- features relating to equally spaced protrusions, trigonal pattern protrusions and low particle production may be included, and other features may also be included.
- FIG. 3 is an illustration of a pattern of protrusions 314 on the surface of an electrostatic chuck, in accordance with an embodiment of the invention, in which the protrusion pattern is used to reduce the forces between a substrate and the protrusions 314.
- Protrusion patterns that equally distribute such forces may be used, for example trigonal or generally hexagonal patterns of protrusions. It should be appreciated that, as used herein, a "trigonal" pattern is intended to mean a regularly repeating pattern of equilateral triangles of protrusions, such that the protrusions are substantially equally spaced apart.
- a pattern may also be viewed as being generally hexagonal in shape, with a central protrusion in the center of an array of six protrusions that form the vertices of a regular hexagon). Forces may also be reduced by increasing the diameter 315 of the protrusions, or by decreasing the center-to-center spacing 316 of the protrusions 314. As shown in the embodiment of FIG. 3, the protrusions may be disposed in an equally spaced arrangement, in which each protrusion is substantially equally spaced apart from the adjacent protrusions by a center to center spacing dimension 316.
- the substrate may contact greater than 25% of the protrusion's top surface area.
- the electrostatic chuck may be a 300 mm configuration, including an aluminum base, an alumina insulator 209 of about 0.120 inches in thickness, an alumina dielectric 205 of about 0.004 inches thickness, and having a rotary platen design to allow rotating and tilting of the substrate that is mounted to the electrostatic chuck.
- the diameter of the electrostatic chuck may, for example, be 300mm, 200mm or 450mm.
- the protrusions 314 may be in a trigonal pattern, with a center to center spacing dimension 316 of from about 6 mm to about 8 mm, for example.
- the diameter 315 of the protrusions may, for example, be about 900 microns.
- FIG. 4 is a diagram of the surface appearance of an electrostatic chuck in accordance with an embodiment of the invention.
- the electrostatic chuck surface includes gas inlets 417, a ground pin passage 418, a gas seal ring 419, a lift pin passage 420 that includes its own gas seal ring (outer light-colored structure of lift pin passage 420 in FIG. 4), and a small gas inlet at 421 in the center of the chuck (inlet not visible in FIG. 4).
- the ground pin passage 418 may include its own gas seal ring (outer ring of ground pin passage 419 in FIG. 4).
- a detail view shows the protrusions 414.
- the gas seal ring 419 (and the gas seal rings of the lift pin passages 420 and ground pin passages 418) may be about 0.1 inches in width and may have an equal height to that of the protrusions 414, such as from about 3 microns to about 12 microns, for example about 6 microns, although other widths and heights are possible.
- an electrostatic chuck may be made by the process of, first, preparing the ceramic assembly using a ceramic to ceramic bond.
- the dielectric layer 205 may be bonded to the insulator layer 209 using the bonding substances described above in connection with the embodiment of FIG. 2.
- the ceramic assembly is coated with the adhesion coating 204, such as the substances discussed above in connection with the embodiment of FIG. 1, to a thickness of about 1 or 2 microns.
- the polymer substance that will make up the charge control layer 202 and protrusions 201 is bonded to the surface of the adhesion coating 204.
- the top of the polymer substance may then be plasma treated to help photoresist (applied next) to stick.
- photoresist is deposited on the polymer substance, and is exposed and developed.
- a reactive ion etch process is used to remove a thickness of the polymer substance (such as between about 3 microns and about 12 microns, in particular about 6 microns) to create the areas between the protrusions 201.
- the amount etched away may be optimized for the back side gas pressure that will be used with the electrostatic chuck.
- the height of the protrusions is preferably approximately the same as, or substantially equal to, the mean free path of the gas used in back side cooling.
- FIG. 5 is a diagram of the profile of a protrusion on an electrostatic chuck in accordance with an embodiment of the invention.
- the width and height are shown in micrometers.
- the protrusion is about 6 microns in height, and has a very smooth wafer contact surface 523.
- the protrusion may have a surface roughness on the wafer contact surface 523 of about 0.02 to about 0.05 ⁇ m.
- the gas seal rings may have a similarly smooth surface, which results in a good seal with the substrate.
- Table 1 shows the results of a gas leak rate experiment in accordance with an embodiment of the invention.
- the left column shows the back side gas pressure applied
- the right column shows the back side gas flow, which occurs as a result of gas leaks out from under the edges of the electrostatic chuck
- the middle column shows the chamber pressure, which will rise as more gas leaks out the edge of the electrostatic chuck. Results of less than 1 seem back side gas flow rate (as here) are considered desirable.
- the gas seal rings of the electrostatic chuck may comprise a surface roughness of less than about 8 microinches, or less than about 4 microinches, or less than about 2 microinches, or less than about 1 microinches.
- the electrostatic chuck is a Coulombic chuck.
- the dielectric can include aluminum, for example alumina or aluminum nitride.
- the electrostatic chuck is a Johnsen-Rahbek electrostatic chuck.
- the electrostatic chuck may not be a Johnsen-Rahbek electrostatic chuck, and the dielectric may be chosen so that a Johnsen-Rahbek (JR) force or partial hybrid Johnsen-Rahbek force does not act on the wafer or substrate.
- JR Johnsen-Rahbek
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
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Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020117026770A KR101680787B1 (en) | 2009-05-15 | 2010-05-13 | Electrostatic chuck with polymer protrusions |
US13/266,657 US8879233B2 (en) | 2009-05-15 | 2010-05-13 | Electrostatic chuck with polymer protrusions |
CN201080019939.2A CN102449754B (en) | 2009-05-15 | 2010-05-13 | There is the electrostatic chuck of polymer protrusions |
JP2012511001A JP5731485B2 (en) | 2009-05-15 | 2010-05-13 | Electrostatic chuck with polymer protrusions |
EP10775520.9A EP2430654B1 (en) | 2009-05-15 | 2010-05-13 | Electrostatic chuck with polymer protrusions |
SG2011083839A SG176059A1 (en) | 2009-05-15 | 2010-05-13 | Electrostatic chuck with polymer protrusions |
US13/667,516 US8861170B2 (en) | 2009-05-15 | 2012-11-02 | Electrostatic chuck with photo-patternable soft protrusion contact surface |
US14/439,464 US9721821B2 (en) | 2009-05-15 | 2013-10-29 | Electrostatic chuck with photo-patternable soft protrusion contact surface |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US21630509P | 2009-05-15 | 2009-05-15 | |
US61/216,305 | 2009-05-15 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/266,657 A-371-Of-International US8879233B2 (en) | 2009-05-15 | 2010-05-13 | Electrostatic chuck with polymer protrusions |
US13/667,516 Continuation-In-Part US8861170B2 (en) | 2009-05-15 | 2012-11-02 | Electrostatic chuck with photo-patternable soft protrusion contact surface |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2010132640A2 true WO2010132640A2 (en) | 2010-11-18 |
WO2010132640A3 WO2010132640A3 (en) | 2011-03-31 |
Family
ID=43085578
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2010/034667 WO2010132640A2 (en) | 2009-05-15 | 2010-05-13 | Electrostatic chuck with polymer protrusions |
Country Status (8)
Country | Link |
---|---|
US (1) | US8879233B2 (en) |
EP (1) | EP2430654B1 (en) |
JP (2) | JP5731485B2 (en) |
KR (1) | KR101680787B1 (en) |
CN (1) | CN102449754B (en) |
SG (2) | SG176059A1 (en) |
TW (2) | TWI534945B (en) |
WO (1) | WO2010132640A2 (en) |
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WO2014070764A1 (en) * | 2012-11-02 | 2014-05-08 | Entegris, Inc. | Electrostatic chuck with photo-patternable soft protrusion contact surface |
WO2014126896A1 (en) * | 2013-02-13 | 2014-08-21 | Entegris, Inc. | Vacuum chuck with polymeric embossments |
US8861170B2 (en) | 2009-05-15 | 2014-10-14 | Entegris, Inc. | Electrostatic chuck with photo-patternable soft protrusion contact surface |
US8879233B2 (en) | 2009-05-15 | 2014-11-04 | Entegris, Inc. | Electrostatic chuck with polymer protrusions |
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Also Published As
Publication number | Publication date |
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JP5731485B2 (en) | 2015-06-10 |
EP2430654A4 (en) | 2013-12-04 |
TWI534945B (en) | 2016-05-21 |
JP5945616B2 (en) | 2016-07-05 |
TW201101416A (en) | 2011-01-01 |
TW201539644A (en) | 2015-10-16 |
JP2015159310A (en) | 2015-09-03 |
CN102449754A (en) | 2012-05-09 |
EP2430654A2 (en) | 2012-03-21 |
KR20120025464A (en) | 2012-03-15 |
KR101680787B1 (en) | 2016-11-29 |
EP2430654B1 (en) | 2019-12-25 |
CN102449754B (en) | 2015-10-21 |
US20120044609A1 (en) | 2012-02-23 |
TWI496240B (en) | 2015-08-11 |
SG10201402319QA (en) | 2014-07-30 |
SG176059A1 (en) | 2011-12-29 |
WO2010132640A3 (en) | 2011-03-31 |
US8879233B2 (en) | 2014-11-04 |
JP2012527125A (en) | 2012-11-01 |
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