WO2010044398A1 - 静電チャック及びその製造方法 - Google Patents
静電チャック及びその製造方法 Download PDFInfo
- Publication number
- WO2010044398A1 WO2010044398A1 PCT/JP2009/067734 JP2009067734W WO2010044398A1 WO 2010044398 A1 WO2010044398 A1 WO 2010044398A1 JP 2009067734 W JP2009067734 W JP 2009067734W WO 2010044398 A1 WO2010044398 A1 WO 2010044398A1
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- WIPO (PCT)
- Prior art keywords
- substrate
- electrostatic chuck
- elastic
- convex portion
- rubber
- Prior art date
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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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- 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
- 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
-
- 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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- 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
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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
Definitions
- the present invention is provided in a substrate bonding apparatus or an ion doping apparatus used for manufacturing a liquid crystal panel, and adsorbs and holds a glass substrate, and also performs an etching process or a chemical vapor phase used in a semiconductor element manufacturing process.
- the present invention relates to an electrostatic chuck that is provided in a plasma processing apparatus such as thin film formation by vapor deposition (CVD), an electronic exposure apparatus, an ion drawing apparatus, an ion implantation apparatus, and the like and is used to attract and hold a semiconductor wafer.
- CVD thin film formation by vapor deposition
- the electrostatic chuck has a function of electrostatically adsorbing and holding a silicon wafer, a glass substrate, or the like in a processing chamber of various semiconductor manufacturing apparatuses and liquid crystal panel manufacturing apparatuses as described above.
- the substrate is brought into contact and held, and therefore, contaminants such as particles adhering to the substrate chucking surface of the electrostatic chuck adhere to the semiconductor wafer or glass substrate, and the semiconductor manufacturing process in the subsequent process May cause problems.
- Contaminants adhering to the substrate, etc. significantly reduce the yield of the final product, such as semiconductor elements, and may cause secondary contamination of the manufacturing equipment used in each process. It can happen to contaminate. Therefore, one of the countermeasures against the problem of contaminant adhesion is to manage the particles on the back surface of the wafer or glass substrate.
- ITRS International Technology Roadmap and For Semiconductors
- One solution to the above-mentioned problem in the electrostatic chuck is to reduce the contact area between the substrate attracting surface and the back surface of the wafer or glass substrate as much as possible.
- the effect of this point appears remarkably when the substrate adsorption surface is made of ceramic. That is, the ceramic is basically porous, and fine ceramic powder and others remaining in the manufacturing process are trapped inside. Therefore, in the process of attracting and holding a substrate such as a semiconductor wafer or a glass substrate with an electrostatic chuck, there is a high possibility that these will be deposited on the substrate attracting surface. Therefore, for example, as disclosed in Japanese Patent Application Laid-Open No.
- the substrate attracting surface of the electrostatic chuck has an embossed structure.
- a plurality of convex portions called are formed, and only the flat top surface of the convex portions is brought into contact with the substrate and sucked.
- Japanese Patent Application Laid-Open No. 2006-237023 discloses that the contact area between the ceramic pin forming the substrate adsorption surface and the substrate is 10% or less of the area of the substrate, and the average height of the pins is 5 ⁇ m or more and 30 ⁇ m. It has been proposed that the standard deviation of the height of the pin be 1.8 ⁇ m or less.
- each of these techniques forms the substrate adsorption surface with a material having relatively hardness such as ceramic, and in an electrostatic chuck having a substrate adsorption surface made of an elastic material such as rubber or resin, Even if the convex part is formed following these, the convex part contracts due to the force when the substrate such as the semiconductor wafer or the glass substrate is attracted to the electrostatic chuck, as planned. The contact area with the substrate may not be reduced. In addition, even if an attempt is made to cool the adsorbed / held substrate via an electrostatic chuck having a cooling means such as a flow path for flowing a refrigerant, the effect may not be sufficiently obtained.
- Japanese Patent Laid-Open No. 2001-60618 discloses that a synthetic rubber absorbing member is attached to a convex portion formed on a substrate adsorption surface, but this document eliminates a focus shift caused by an exposure apparatus.
- Japanese Patent Laid-Open No. 10-335439 includes a silicon rubber substrate suction surface on which a texture pattern is formed so that the contact area with the wafer is 20 to 90% of the wafer area.
- an electrostatic chuck is described and the hardness (JIS-A) of silicone rubber is 85 or less (see paragraphs 0008 and 0009), this document considers the state in which the substrate is attracted and held. Not what you want.
- the present inventors reduce contaminants such as particles adhering to the substrate as much as possible in the electrostatic chuck having the substrate attracting surface made of an elastic material such as rubber or resin.
- the shape of the convex part with the attracting force applied should be optimized.
- the present invention can reduce the adhesion of contaminants from the substrate adsorption surface to the substrate, and at the same time, can efficiently perform cooling via the electrostatic chuck while keeping the contact area of the substrate optimal. It is to provide an electrostatic chuck.
- the present invention is an electrostatic chuck that uses an elastic adsorption layer having a plurality of convex portions made of an elastic material as a substrate adsorption surface, and adsorbs and holds the substrate through the elastic adsorption layer,
- the height of the convex portion in the elastic adsorption layer is h
- the number of convex portions per unit area on the substrate adsorption surface is n
- the area of the top surface of the convex portion is A
- the elastic modulus of the elastic material forming the convex portion is E.
- the electrostatic chuck is characterized in that the ratio ⁇ of the total area of the convex top surface per unit area on the substrate attracting surface is 10% or more.
- the present invention is also a method for manufacturing the electrostatic chuck, comprising: an elastic layer made of an elastic material; an upper insulating layer; an electrode layer forming an internal electrode; and a lower insulating layer.
- the sheet is accommodated in a vacuum chuck device, and a vacuum is sucked by interposing a predetermined pattern mask on the elastic layer side of the electrostatic chuck sheet, thereby forming a convex portion corresponding to the pattern mask to obtain an elastic adsorption layer. It is the manufacturing method of the electrostatic chuck characterized.
- the contact state between the convex part of the elastic adsorption layer and the substrate is optimized.
- the contact state at the time of adsorption means the ratio of the back surface of the substrate attracted and held by the electrostatic chuck contacting the top surface of the convex portion.
- the optimization of the contact condition includes the force to adsorb, the softness of the material forming the convex part (that is, the elastic modulus), the height of the convex part, the area of the top surface of the convex part, and the contact area described above. The relationship.
- the height h of the convex portion in the elastic adsorption layer is preferably 1 ⁇ m or more and 1000 ⁇ m or less. If the height h of the convex portion is less than 1 ⁇ m, as will be described later, the value of the deflection or warpage of a normal silicon wafer used for semiconductor manufacturing may be smaller, and the function as the convex portion may not be achieved. On the other hand, if the height h of the convex portion is larger than 1000 ⁇ m, the thermal resistance in the elastic adsorption layer becomes too large, and there is a possibility that the cooling of the substrate becomes insufficient.
- the elastic modulus E of the elastic material forming the convex portion is preferably in the range of 0.1 MPa to 50 MPa.
- a so-called general rubber has a modulus of elasticity (herein referred to as Young's modulus) of about 1 MPa, whereas a resin such as polyimide is about 3 digits higher than rubber and about 1 GPa. Therefore, with a relatively hard resin such as polyimide, the shrinkage amount ⁇ (m) of the convex portion may be too small.
- rubber or the like An elastic adsorption layer is formed from the elastic material.
- silicone rubber acrylic rubber, nitrile rubber, isoprene rubber, urethane rubber, ethylene propylene rubber, epichlorohydrin rubber, chloroprene rubber, styrene butadiene rubber, butadiene rubber, fluoro rubber, butyl rubber It is good to consist of at least one selected from among them.
- silicone rubber containing the same material as that of a commonly used silicon wafer is preferable in order to minimize the influence of contamination on the substrate attracted and held by the electrostatic chuck.
- fluororubbers that are chemically stable.
- the maximum dimension of the planar shape of the convex portion is 1/10 or less and 1/500 or more of the maximum dimension of the substrate suction surface. More preferably, it is not less than 1/100 and not more than 1/10 of the maximum dimension of the substrate adsorption surface.
- the top surface of the convex portion is preferably a circle having a diameter of 3 mm to 30 mm. If the maximum dimension of the planar shape of the convex part is less than 1/500 of the maximum dimension of the substrate adsorption surface, the processing becomes difficult particularly when the elastic modulus of the material forming the convex part is small. It becomes difficult to guarantee shape processing throughout.
- the planar shape of the convex portion is larger than one tenth of the maximum dimension of the substrate adsorption surface, as a result, the interval between the convex portions adjacent to each other becomes too large, and the substrate is cooled in the gap portion between the convex portions. If not enough, cooling of the substrate may not be uniform.
- the product of the area A of the top surface of the convex portion and the number n of convex portions per unit area of the substrate adsorption surface is the theoretical total contact area nA (m 2 ).
- the total area nA (m 2 ) can be used as an index to form the convex portion in the elastic adsorption layer, from the viewpoint of effectively cooling the substrate.
- the right parenthesis (F / E) in this expression indicates the adsorption force F of the electrostatic chuck and the elastic modulus E of the resin material of the convex portion. Ratio.
- the attracting force F represents the attracting force per unit area on the substrate attracting surface.
- F is a value that is two orders of magnitude smaller than E.
- E 1 MPa for an elastic body such as rubber
- F / E 4.9 ⁇ 10 ⁇ 3 .
- (h / nA) in the left parenthesis indicates the ratio of the nA of the convex portion to the height of the convex portion, that is, the total contact area. Therefore, an appropriate (h / nA) allowed for manufacturing is selected for the assumed adsorption force F and the elastic modulus E of the material of the convex portion, and finally the relational expression 5W h ⁇ ⁇ ⁇ 0.5W h Design to meet
- the convex portion made of an elastic material may be formed on a base material made of another material, and the convex portion and the base material are integrated into an elastic material. You may make it form from.
- the specific means which forms a predetermined convex part For example, the following methods can be illustrated. That is, by performing a blasting process or the like on a sheet made of an elastic material through a mask or the like, a convex part having a predetermined planar shape and a height h (depth) can be formed.
- An electrostatic chuck sheet comprising an elastic layer made of an elastic material, an upper insulating layer, an electrode layer forming an internal electrode, and a lower insulating layer is accommodated in a vacuum chuck device, and the elastic layer of the electrostatic chuck sheet A convex portion corresponding to the pattern mask may be formed by vacuum suction with a predetermined pattern mask interposed on the side.
- the top surface of the convex part in an elastic adsorption layer.
- the top surface of the convex portion can be brought into contact along finer local unevenness that cannot be expressed by the overall flatness W h of the back surface of the substrate.
- the size of the pear pattern it is preferable that the size and height of the protruding portion are in the range of 1 nm to 100 nm, respectively.
- the substrate that is attracted and held by the electrostatic chuck of the present invention for example, a glass substrate used for manufacturing a liquid crystal panel, a silicon wafer used in a semiconductor element manufacturing process, etc. Anything to do.
- a silicon wafer having a diameter of 300 mm and a thickness of 0.8 mm that is generally used has a deflection (bow) and a warp of about 10 ⁇ m on average.
- GBIR Global Back-Surface-Referenced Ideal Plane Range
- TTV Total Thickness Variation
- this “overall flatness” is about 1 ⁇ m. Therefore, the overall flatness W h of the substrate targeted by the electrostatic chuck of the present invention can be in the range of 0.1 ⁇ m to 10 ⁇ m.
- the contraction amount (compression distance) of the convex portion when such a substrate is attracted and held by the electrostatic chuck is 0.5 times the overall flatness W h of the substrate.
- the elastic modulus, shape, and arrangement of the elastic adsorption layer are set.
- the suction force F for sucking and holding the substrate in the present invention, at least the suction force required for suction of currently used silicon wafers, glass substrates and the like is considered. Shall be taken into consideration when adsorbed and held at 100 Pa or higher.
- the electrostatic chuck according to the present invention has an elastic adsorption layer having a plurality of convex portions made of an elastic material as a substrate adsorption surface, and can adsorb and hold the substrate via the elastic adsorption layer.
- the specific structure is not particularly limited, and an electrostatic chuck sheet having a so-called internal electrode and a laminated structure like a known electrostatic chuck is attached to a metal substrate having a flow path for flowing a cooling medium. It is possible to adopt a configuration such as sticking.
- An elastic adsorption layer is formed on the upper insulating layer (substrate adsorption surface side insulation layer) forming the electrostatic chuck sheet so that the elastic adsorption layer becomes a substrate adsorption surface when a voltage is applied to the internal electrode. You may make it provide, or you may make this elastic adsorption layer serve as an upper insulating layer. Moreover, even if it is a bipolar electrostatic chuck having a positive electrode and a negative electrode as internal electrodes, it is a monopolar type that has only a positive (negative) electrode as an internal electrode and the negative (positive) side is grounded. There may be. Furthermore, the material of the upper insulating layer and the lower insulating layer (metal substrate side insulating layer) and the material and shape of the internal electrode are not particularly limited.
- the semiconductor wafer, the glass substrate and the like are inevitably adsorbed and held by the substrate adsorption surface through the convex portions of the elastic adsorption layer while absorbing the warp and deflection that the semiconductor wafer and the glass substrate inevitably have. Therefore, it is possible to reduce the transfer of particles and other contaminants from the substrate adsorption surface to the back surface of the substrate as much as possible, and to transfer the substrate heat stored during processing to the electrostatic chuck as much as possible. Thus, the substrate can be efficiently cooled via the electrostatic chuck.
- FIG. 1A and 1B are explanatory views showing an electrostatic chuck according to the present invention, wherein FIG. 1A is a schematic plan view showing a state of a convex portion in an elastic adsorption layer, and FIG. 1B is an electrostatic chuck as viewed from the AA cross-sectional direction.
- the cross-sectional schematic diagram which shows the mode of is shown.
- 2A and 2B are explanatory views showing the electrostatic chuck according to the first embodiment of the present invention.
- FIG. 2A is a schematic plan view seen from the elastic adsorption layer
- FIG. 2B is an electrostatic view seen from the BB cross-sectional direction. It is a cross-sectional schematic diagram which shows the mode of a chuck
- FIG. 3 is a schematic cross-sectional view of the electrostatic chuck according to the second embodiment of the present invention as viewed from the side.
- Table 1 shows that, when rubber is made of silicone rubber having a modulus of elasticity of 1 MPa, which is considered to be relatively soft (Examples 1 to 3), it is a representative of engineering plastics and has a modulus of elasticity of 1 GPa that is also commonly used in electrostatic chucks. Examples of protrusions provided in the elastic adsorption layer are shown for the cases of polyimides (Examples 4 and 5) and the case of an elastic modulus of 10 MPa, which is relatively hard among rubbers.
- FIG. 1A is an explanatory plan view showing the arrangement relationship of convex portions in Table 1.
- FIG. FIG. 1A is an explanatory plan view showing the arrangement relationship of convex portions in Table 1.
- FIG. 1A shows a state in which the convex portion 1 having a diameter d (m) is arranged at each vertex of an equilateral triangle having a side length of a (m), and one of the convex portions 1c is shown.
- a convex portion 1g, a convex portion 1h, a convex portion 1d, a convex portion 1f, and a convex portion 1e are arranged in the clockwise direction from the convex portion 1b.
- These convex portions 1 show a part of the electrostatic chuck 100 so that the convex portions 1 form a substrate attracting surface of the electrostatic chuck 100 in an arrangement state having such a relationship. Distributed over the entire surface.
- the electrostatic chuck 100 includes a base (metal base) 5 made of, for example, aluminum metal, and a lower insulating layer 3 and an elastic adsorption layer 2 are stacked thereon, and an adsorption electrode (internal electrode) is interposed therebetween. ) 4.
- the elastic adsorption layer 2 also serves as an upper insulating layer that electrically insulates the upper surface side of the adsorption electrode 4, and the elastic adsorption layer 2 includes a plurality of convex portions 1 having a height h (m).
- a substrate suction surface is formed by supporting the substrate 6. Further, an upper surface 2 b that does not come into contact with the substrate 6 is provided between the adjacent convex portions 1 in the elastic adsorption layer 2.
- the diameter d of the convex portion is the same as in Example 2, the height h is lowered, and the interval a is further reduced. ⁇ is approximately half that in Example 2, but ⁇ Is about 20% better than Example 2.
- Example 4 is a case where the material of the convex portion is polyimide, and the height h, the diameter d, and the interval a of the convex portion are the same as in Example 1, but ⁇ is smaller in inverse proportion to the elastic modulus. It becomes an extremely small value of about 0.001 ⁇ m. Therefore, the flexibility of the convex portion can hardly be expected.
- the material of the convex portion is the same as that in Example 4, but ⁇ can be relatively large, but ⁇ is extremely reduced to 0.1 (%), which is in contact with the substrate. Heat conduction by cannot be expected.
- Example 1 Prepare a 100 ⁇ m, 300mm ⁇ 300mm thin film silicone sheet (manufactured by Sanshin Enterprise Co., Ltd., micro silicone sheet single-sided pear base type, model number N ⁇ KSA-100-50) and cut it into a circular shape with a diameter of 298mm as described below. Thus, an elastic adsorption layer 2 was obtained. Also, a copper-clad laminate (manufactured by Ube Industries, Ltd., copper-clad laminate “Iupicel (registered trademark) N”) in which a copper foil with a thickness of 9 ⁇ m is laminated on one side of a polyimide sheet with a thickness of 50 ⁇ m is used.
- a copper-clad laminate manufactured by Ube Industries, Ltd., copper-clad laminate “Iupicel (registered trademark) N” in which a copper foil with a thickness of 9 ⁇ m is laminated on one side of a polyimide sheet with a thickness of 50 ⁇ m is used.
- the foil surface is masked, and a bipolar electrode (electrode spacing: 2 mm) having a half-moon pattern (semicircular shape with a diameter of 294 mm) is formed with a corrosive etching solution, and a polyimide sheet with a diameter of 298 mm is formed on the lower insulating layer. It was set to 3. Then, as shown in FIG. 2, the silicone sheet was bonded to the copper foil surface side of the copper-clad laminate through an epoxy bonding sheet (not shown) having a thickness of 10 ⁇ m so that the pear ground of the silicone sheet was on the front side.
- an epoxy bonding sheet not shown
- the integrally bonded sheet has a cooling water channel 7 having a diameter of 6 mm inside, and is bonded to the aluminum base 5 having a plate thickness of 15 mm and a diameter of 298 mm via the above-described epoxy bonding sheet.
- the pear ground of the silicone sheet was the front side, that is, the substrate adsorption surface.
- the contact state of the convex portion 1 was confirmed by visual observation through a transparent Pyrex (registered trademark) glass plate, and it was confirmed that all the convex portions 1 were in contact with the top surface. .
- the state of the light interference fringes is different, so that both states can be discriminated visually.
- pressure sensitive paper is sandwiched between the glass plate and the substrate suction surface of the electrostatic chuck 101 and pressed by a press in the same manner as described above, it is detected at all the convex portions 1.
- Example 2 A composite sheet 11 in which a 25 ⁇ m thick polyimide sheet is bonded with a 100 ⁇ m thick silicone sheet whose surface is treated with pear ground, an acrylic epoxy bonding sheet 12 with a thickness of 13 ⁇ m, and an electrolytic copper foil 13 with a thickness of 12 ⁇ m (Furukawa Circuit Foil Co., Ltd.) was cut into circles each having a diameter of 298 mm and laminated by press molding under conditions of 3 MPa and 170 ° C.
- etching is performed on adjacent fan-shaped electrodes (distance 3 mm between adjacent electrodes) divided into 10 with the center as the axis of symmetry. Formed.
- a polyimide sheet 14 Toray Dupont (toray) having a thickness of 50 ⁇ m is formed so as to cover the electrode surface obtained by etching through the acrylic epoxy bonding sheet 12 having a thickness of 13 ⁇ m cut out to a diameter of 298 mm.
- Co., Ltd., Kapton Film Model 200H was superposed and press-molded under the same conditions as described above and laminated together.
- a 55 ⁇ m-thick Kapton single-sided adhesive tape (Okamoto Co., Ltd. 1030E) was adhered to the entire surface of the pear ground of the laminate obtained above, and further covered with a polyimide sheet 14 to join the terminals to the electrodes.
- the electrode surface was placed on the hot plate with the upper side facing upward, and the copper terminals were soldered while heating.
- a plurality of holes are formed so that the center of the opening with a diameter of 23 mm is arranged at each vertex of a regular triangle with a side length of 35 mm to form a pattern mask.
- irregularities corresponding to the hole diameter and thickness of the pattern mask are formed, and as will be described later, after the Kapton single-sided adhesive tape is finally peeled off, the silicone sheet having a pear ground is shown in Table 2 as the top surface. Convex portions are formed.
- silicone adhesive 15 (Momentive Performance Materials Japan GK, Model TSE3331) is 150 ⁇ m thick on the polyimide sheet surface on which the copper terminals are attached.
- an aluminum base 16 having a plate thickness of 16 mm and a diameter of 298 mm and having a cooling water channel inside is mounted, the power of the pump that sucks the vacuum chuck is turned off, and 1 in the defoaming chamber. After degassing for a time, the whole was heated to 140 ° C. on a hot plate to cure the silicone adhesive over several hours.
- Example 2 having the convex portion 1 as shown in FIG.
- the electrostatic chuck (No. 1) according to No. 1 was completed.
- the static chuck according to the embodiment of the present invention is the same as described above except that the convex portion in Example 3 described in Table 1 is formed.
- An electric chuck (No. 2) was obtained.
- Each of the electrostatic chucks 2 is mounted on an ion implantation apparatus, and a silicon wafer having a diameter of 300 mm is attracted and held at a supply voltage of ⁇ 750 V, and an average ion beam power of 450 W and an implantation amount of 1 ⁇ 10 are applied to the silicon wafer.
- Ion implantation was performed under the condition of 15 / cm 2 . At this time, cooling water was allowed to flow through the aluminum-based water channel at a rate of 2 L / min. And when the wafer surface temperature at the time of ion implantation was measured with the thermo label, it was No. No.
- the temperature rise can be suppressed to less than 48 ° C.
- the temperature rise could be suppressed to less than 89 ° C.
- no. In the test using the electrostatic chuck No. 1, even when the ion beam power was increased to 600 W, the temperature increase was less than 60 ° C. even at the same implantation amount as described above. This can be said to be comparable to a conventional electrostatic chuck with gas cooling.
- Convex part 2 Elastic adsorption layer 2b: Upper surface other than the convex portion of the elastic adsorption layer 3: Lower insulating layer 4: Adsorption electrode 5: Base 6: Substrate 7: Water channel 8: Insulation sleeve 9: Potential supply line 10: Power supply 11: Composite sheet 12: Bonding sheet 13: Electrolytic copper foil 14: Polyimide sheet 15: Silicone adhesive 16: Base 100, 101: Electrostatic chuck
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Abstract
Description
弾性吸着層における凸部の高さをh、基板吸着面における単位面積当たりの凸部の数をn、凸部における頂面の面積をA、凸部を形成する弾性材料の弾性率をEとして、全体的平坦度がWhの基板を吸着力Fで吸着・保持したときに、吸着力Fが働く方向に凸部が収縮する量δが、以下の関係式(1)を満足し、かつ、基板吸着面における単位面積あたりの凸部頂面の総面積の割合ξが10%以上であることを特徴とする静電チャックである。
5Wh≧δ≧0.5Wh、ここでδ=(h/nA)・(F/E) ・・・(1)
〔但し、各値の単位は、それぞれ括弧内に示したものである;Wh(m)、h(m)、n(個/m2)、A(m2)、E(Pa)、F(Pa)、δ(m)。〕
2Wh≧δ≧1Wh、ここでδ=(h/nA)・(F/E) ・・・(2)
〔各値の単位は、関係式(1)と同じである。〕
表1には、ゴムのなかでも比較的柔らかいとされる弾性率1MPaのシリコーンゴムからなる場合(例1~3)、エンジニアリングプラスティクの代表であり、静電チャックでも一般に使用される弾性率1GPaのポリイミドからなる場合(例4、5)、及びゴムの中でも比較的硬いとされる弾性率10MPaの場合について、それぞれ弾性吸着層が備える凸部の例を示す。また、図1(a)は、この表1における凸部の配置関係を示す平面説明図である。この図1(a)では、直径d(m)の凸部1を一辺の長さがa(m)の正三角形の各頂点に配置している様子を示しており、そのうちのひとつ凸部1cを中心として、凸部1bから時計回り方向に凸部1g、凸部1h、凸部1d、凸部1f、及び凸部1eが配置されている。これらの凸部1は、静電チャック100における一部を示しているものであり、このような関係を有した配置状態で、凸部1が静電チャック100の基板吸着面を形成するように全面に分布する。また、図1(a)におけるA-A断面方向から見た静電チャック100の様子を図1(b)に示す。静電チャック100は、例えばアルミニウム金属で形成されたベース(金属基盤)5を有し、その上に下部絶縁層3と弾性吸着層2が積層されており、これらの間に吸着電極(内部電極)4を備えている。このうち、弾性吸着層2は、吸着電極4の上面側を電気的に絶縁する上部絶縁層を兼ねており、弾性吸着層2は、高さh(m)の凸部1を複数備えて、基板6を支持して基板吸着面を形成する。また、この弾性吸着層2における隣接した凸部1の間には、基板6とは接触しない上面2bを有する。
厚み100μm、300mm×300mmの薄膜シリコーンシート(サンシンエンタープライズ株式会社製、マイクロシリコーンシートの片面梨子地タイプ、型番NμKSA-100-50)を用意し、直径298mmの円形に切りだして、後述のようにして弾性吸着層2とした。また、厚さ50μmのポリイミドシートの片面に厚さ9μmの銅箔が積層された銅張積層板(宇部興産株式会社製、銅張積層板「ユピセル(登録商標)N」)を用いて、銅箔面にマスキングをして腐食性エッチング液にて半月型パターン(直径294mmの半円状)を有する双極型(電極間隔2mm)の吸着電極4を形成し、直径298mmのポリイミドシートを下部絶縁層3とした。そして、図2に示すように、銅張積層板の銅箔面側に、厚さ10μmのエポキシ系ボンディングシート(図示せず)を介して、シリコーンシートの梨子地面が表側になるよう接着した。一体に貼り合わされたシートは、内部に直径6mmの冷却水の水路7を有して、板厚15mm、直径298mmのアルミニウム製ベース5に対して、前述のエポキシ系ボンディングシートを介して貼着し、シリコーンシートの梨子地面が表側、すなわち基板吸着面となるようにした。
厚さ25μmのポリイミドシートに、表面が梨子地に処理された厚さ100μmのシリコーンシートが張り合わされた複合シート11、厚さ13μmのアクリルエポキシボンディングシート12、及び、厚さ12μmの電解銅箔13(古河サーキットフォイル(株)製)を、それぞれ直径298mmの円形に切り出して、プレス成型にて3MPa、170℃の条件で積層化した。
2:弾性吸着層
2b:弾性吸着層の凸部以外の上面
3:下部絶縁層
4:吸着電極
5:ベース
6:基板
7:水路
8:絶縁スリーブ
9:電位供給線
10:電源
11:複合シート
12:ボンディングシート
13:電解銅箔
14:ポリイミドシート
15:シリコーン接着剤
16:ベース
100、101:静電チャック
Claims (7)
- 弾性材料からなる複数の凸部を備えた弾性吸着層を基板吸着面とし、この弾性吸着層を介して基板を吸着・保持する静電チャックであって、
弾性吸着層における凸部の高さをh、基板吸着面における単位面積当たりの凸部の数をn、凸部における頂面の面積をA、凸部を形成する弾性材料の弾性率をEとして、全体的平坦度がWhの基板を吸着力Fで吸着・保持したときに、吸着力Fが働く方向に凸部が収縮する量δが、以下の関係式(1)を満足し、かつ、基板吸着面における単位面積あたりの凸部頂面の総面積の割合ξが10%以上であることを特徴とする静電チャック。
5Wh≧δ≧0.5Wh、ここでδ=(h/nA)・(F/E) ・・・(1)
〔但し、各値の単位は、それぞれ括弧内に示したものである;Wh(m)、h(m)、n(個/m2)、A(m2)、E(Pa)、F(Pa)、δ(m)。〕 - 凸部の高さhが1μm以上1000μm以下の範囲である請求項1に記載の静電チャック。
- 凸部を形成する弾性材料の弾性率Eが、0.1MPa以上50MPa以下の範囲である請求項1に記載の静電チャック。
- 凸部を形成する弾性材料は、シリコーンゴム、アクリルゴム、ニトリルゴム、イソプレンゴム、ウレタンゴム、エチレンプロピレンゴム、エピクロルヒドリンゴム、クロロプレンゴム、スチレンブタジエンゴム、ブタジエンゴム、フッ素ゴム、及びブチルゴムからなる群から選ばれた1以上である請求項1に記載の静電チャック。
- 凸部の頂面が梨子地パターンを備える請求項1に記載の静電チャック。
- 基板の全体的平坦度Whが、0.1μm~10μmの範囲である請求項1に記載の静電チャック。
- 請求項1~6のいずれかに記載の静電チャックを製造する方法であって、弾性材料からなる弾性層と、上部絶縁層と、内部電極を形成する電極層と、下部絶縁層とを備えた静電チャックシートを真空チャック装置に収容し、静電チャックシートの弾性層側に所定のパターンマスクを介在させて真空吸引することで、パターンマスクに対応した凸部を形成して弾性吸着層を得ることを特徴とする静電チャックの製造方法。
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JP6435481B1 (ja) * | 2017-09-04 | 2018-12-12 | 株式会社プロセス・ラボ・ミクロン | ワーク吸着冶具とワーク吸着装置 |
JP2019047643A (ja) * | 2017-09-04 | 2019-03-22 | 株式会社プロセス・ラボ・ミクロン | ワーク吸着冶具とワーク吸着装置 |
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TWI467691B (zh) | 2015-01-01 |
KR20110084888A (ko) | 2011-07-26 |
KR101559947B1 (ko) | 2015-10-13 |
CN102187446A (zh) | 2011-09-14 |
CN102187446B (zh) | 2013-07-24 |
JPWO2010044398A1 (ja) | 2012-03-15 |
HK1158368A1 (en) | 2012-07-13 |
JP5458323B2 (ja) | 2014-04-02 |
TW201026582A (en) | 2010-07-16 |
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