WO2010110137A1 - 高周波電極の接続方法を改善したウエハ保持体及びそれを搭載した半導体製造装置 - Google Patents
高周波電極の接続方法を改善したウエハ保持体及びそれを搭載した半導体製造装置 Download PDFInfo
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- WO2010110137A1 WO2010110137A1 PCT/JP2010/054506 JP2010054506W WO2010110137A1 WO 2010110137 A1 WO2010110137 A1 WO 2010110137A1 JP 2010054506 W JP2010054506 W JP 2010054506W WO 2010110137 A1 WO2010110137 A1 WO 2010110137A1
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- WIPO (PCT)
- Prior art keywords
- wafer
- support member
- wafer holder
- frequency electrode
- conductive connection
- Prior art date
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Images
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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/458—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber
- C23C16/4581—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber characterised by material of construction or surface finish of the means for supporting the substrate
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/458—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber
- C23C16/4582—Rigid and flat substrates, e.g. plates or discs
- C23C16/4583—Rigid and flat substrates, e.g. plates or discs the substrate being supported substantially horizontally
- C23C16/4586—Elements in the interior of the support, e.g. electrodes, heating or cooling devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/32532—Electrodes
- H01J37/32577—Electrical connecting means
-
- 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
- H01L21/68792—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 construction of the shaft
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
- H01L21/67063—Apparatus for fluid treatment for etching
- H01L21/67069—Apparatus for fluid treatment for etching for drying etching
Definitions
- the present invention relates to a wafer holder used for holding and heat-treating a wafer in a semiconductor manufacturing process, in particular, a wafer holder used for heat-treating a film or etching by CVD or the like on a wafer, or a resist.
- the present invention also relates to a semiconductor manufacturing apparatus equipped with the same.
- a resistance heating element circuit, a high-frequency electrode circuit, and, if necessary, electrodes for an electrostatic chuck are embedded in the wafer holder, and these electrode terminals are taken out from the opposite surface of the wafer mounting surface. Yes.
- Conductive connection parts are connected to these electrode terminals as conductive lines.
- the conduction line including the conductive connection component is taken out of the reaction vessel through the inside of the pipe-shaped support member and the metal or ceramic flange for connecting the chamber, and is connected to the power supply system as necessary.
- a parallel plate type plasma CVD apparatus As a popular method of using such a wafer holder, there is a parallel plate type plasma CVD apparatus.
- a plasma upper electrode is installed at the upper part of the reaction vessel, and a plasma lower electrode is installed inside the wafer holding unit, thereby generating plasma between them.
- the reaction is assisted by this plasma to deposit and generate a necessary film on the wafer.
- the lower electrode also has an electrostatic chuck function, a bias voltage may be applied to the lower electrode for wafer adsorption.
- it is connected to an earth component and the earth component is fixed to the chamber to achieve zero. Often kept at electrical potential.
- a conductive connection component For example, if the amount of thermal expansion of a conductive connection component is larger than that of a ceramic pipe-shaped support member, and the conductive connection component is rigidly fixed at the bottom of the pipe-shaped support member, the conductive connection component The component pushes up the wafer holder from the surface opposite to the wafer mounting surface, and in the worst case, the wafer holder may be deformed or damaged.
- Patent Document 1 proposes a coupler structure inside a connector in which a metal flange portion and a conductive connecting part are slidable using a coiled spring contact.
- connection point between the conductive connection part and the ground part serves both as sliding and electrical connection for stress relaxation due to thermal expansion.
- the friction due to sliding during thermal expansion generates particles, or the connection is incomplete due to sliding.
- the electric path is limited, and there is a case in which a drift occurs in that portion, causing abnormal overheating or burning.
- the present invention connects the high-frequency electrode circuit to the ground via the ground part by an electrically strong connection method without a sliding part, thereby causing abnormal overheating and particles at the connection part.
- An object of the present invention is to provide a wafer holder having a high-reliability high-frequency electrode circuit capable of preventing the occurrence of the above, and a semiconductor manufacturing apparatus equipped with the wafer holder.
- a wafer holder provided by the present invention is provided in a chamber, a wafer holding part in which a high-frequency electrode circuit is embedded, and a surface of the wafer holding part opposite to the wafer mounting surface.
- a support member that is supported from the ground, a grounding component that is provided on the opposite side of the wafer holding portion with respect to the support member, and a conductive member that is inserted into the support member and electrically connects the high-frequency electrode circuit and the grounding component.
- the conductive connection part has a deformability in the vertical direction, and the connection part that bears the main current path of the conductive connection part is fixed by surface contact.
- the conductive connecting component includes a metal rigid member extending downward in the vertical direction connected to the high-frequency electrode circuit, and a flexible member connected to the rigid member. It is preferable to have.
- the flexible member can be formed of a spiral member or a leaf spring member that extends downward in the vertical direction, or a flat member that extends in the horizontal direction.
- connection portion between the conductive connection component and the ground component can be connected at the same time as or after the connection between the support member and the ground component.
- the present invention further provides a semiconductor manufacturing apparatus on which a wafer holder having these characteristics is mounted.
- the electrical connection part between the high-frequency electrode circuit of the wafer holder and the grounding part can be made strong and reliable without a sliding part, so that abnormal overheating in the connection part can be achieved. And particle generation can be prevented. Therefore, it is possible to provide a wafer holder provided with a high-reliability high-frequency electrode circuit and a semiconductor manufacturing apparatus equipped with the wafer holder.
- FIG. 6 is a partial cross-sectional view showing a conductive connection component provided in a wafer holder of Comparative Example 1.
- FIG. 10 is a partial cross-sectional view showing a conductive connection component provided in a wafer holder of Comparative Example 2.
- FIG. It is a fragmentary sectional view which shows the electroconductive connection component which the wafer holder of the comparative example 3 comprises.
- a wafer holder 10 shown in FIG. 1 is mounted in a chamber of a semiconductor manufacturing apparatus such as a plasma CVD apparatus (not shown), and includes a disk-shaped wafer holder 1 on which a semiconductor wafer is placed, and the wafer holder.
- a support member 2 preferably made of a ceramic that supports the portion 1 from the surface opposite to the wafer mounting surface 1a (hereinafter also referred to as the back surface 1b), and the support member 2 is connected to the wafer holding portion 1 with respect to the support member 2.
- an earthing part 3 provided on the opposite side.
- the resistance heating element circuit 4 has a pair of electrode terminals (not shown), and each one end thereof is connected to the back surface 1b of the wafer holding unit 1 so that a conductive connection component described later can be connected thereto. Exposed. Similarly, in the high-frequency electrode circuit 5, one end portion of the electrode terminal (not shown) is exposed from the back surface 1 b of the wafer holding unit 1.
- the electrode terminals provided on the wafer holding unit 1 may be tungsten plated with Ni.
- a threaded portion is provided in advance at one end of the electrode terminal of the resistance heating element circuit 4 exposed from the back surface 1b of the wafer holding portion 1.
- the threaded portion is also provided in advance in the conductive connection component 6 for the resistance heating element circuit 4 so as to be screwed into the threaded portion.
- the conductive connection component 6 for the resistance heating element circuit 4 is electrically connected to the resistance heating element circuit 4.
- the conductive connection part 7 for the high-frequency electrode circuit 5 is also electrically connected to the high-frequency electrode circuit 5 through screw parts that are similarly screwed together.
- the structure of the conductive connection component 6 for the resistance heating element circuit 4 is not particularly limited, and the power supply system (not shown) outside the chamber system is passed through the inside of the support member 2 and the through hole 3a provided in the grounding component 3. Connected).
- the conductive connection part 7 for the high-frequency electrode circuit 5 may partially include a hollow pipe-like electrode structure as disclosed in, for example, Japanese Patent Application Laid-Open No. 2007-281161.
- the conductive connection part 7 for the high-frequency electrode circuit 5 is an insulation made of an insulating material such as ceramics in order to avoid electrical interference with other electrode circuits, for example, the conductive connection part 6 of the resistance heating element circuit 4. It is desirable to be surrounded by a tube (not shown).
- the lower part of the conductive connection part 7 for the high-frequency electrode circuit 5 is connected to the ground via the ground part 3.
- the conductive connecting part 7 is directly fixed to the grounding part 3 provided at the lower part in the vertical direction while being in a deformable state, that is, in a rigid (rigid) state, the wafer holder 1 is heated.
- the conductive connection component 7 is thermally expanded, and the wafer holding unit 1 is pushed up from the back surface.
- the conductive connecting part 7 has a deformability in the vertical direction, and one end thereof is fixed to the grounding part 3 by surface contact.
- the surface contact means that the connection part of the conductive connection part 7 and the grounding part 3 are in contact with each other instead of a point or a line, and the fixation means that the contact part between these surfaces is slid. It means that they are firmly fixed to each other without moving.
- Specific examples of the method of fixing by surface contact include screwing, brazing, welding, and the like.
- a metal rigid member extending downward in the vertical direction from a connection portion with the electrode terminal and a metal flexible member electrically connected thereto are used. This can be achieved by configuring the conductive connecting component 7 with the two members.
- the conductive connecting component 7 shown in FIG. 1 includes a metal rod 7a extending vertically downward, and a plate-like metal lead 7b having a flexibility extending in the horizontal direction attached to the lower portion of the metal rod 7a.
- the conductive connection component 7 is configured as described above.
- the lower end portion of the metal rod 7a is made to have a structure in which a male screw or a female screw is threaded, and both end portions are previously connected to the lower end portion of the metal rod 7a.
- the other hole of the metal lead 7b is preferably screwed to the grounding part 3 provided at the lower part of the support member 2, so that the end of the metal lead 7b provided with the other hole is provided. And the upper surface of the grounding part 3 maintain a surface contact state.
- the metal lead 7b is preferably attached so as to extend in the horizontal direction, so that it can freely move in the vertical direction in response to the vertical thermal expansion and contraction of the conductive connection part 7 for the high-frequency electrode circuit 5. Can bend. Therefore, it is not necessary to provide a sliding portion in the connection portion of the conductive connection component 7, a strong fixed state can be maintained in the electrical path (conduction path), and high reliability can be maintained over a long period of time. Structure can be provided.
- the surface contact in the connection part of the electroconductive connection component 7 may be a surface contact between planes, or may be a surface contact between curved surfaces having substantially the same shape.
- the connecting portion of the conductive connecting part 7 is constituted by a cylindrical rod, and an annular member having substantially the same inner diameter as this is half-cracked, and the cylindrical rod is sandwiched to ensure surface contact. It doesn't matter how.
- the flat metal lead 7b When the flat metal lead 7b is fixed to the grounding component 3, it is preferable that it can be connected from the outside of the supporting member 2 at the same time as or after the support member 2 is connected to the grounding component 3 as a procedure. Otherwise, it is assumed that fixing the metal lead 7b to the grounding part 3 before attaching the grounding part 3 to the support member 2 is substantially difficult or very complicated. This is because that.
- the hole provided in the edge part of the metal lead 7b is matched with the hole of the flange part of the supporting member 2, and the said Examples include a method in which the end portion of the metal lead 7 b is sandwiched between the flange portion and the ground component 3, and the end portion of the metal lead 7 b is connected to the ground component 3 with a bolt 8 that connects the support member 2 and the ground component 3. it can.
- the aspect ratio of the cross section parallel to the paper surface of FIG. 1 is preferably 3 or more in the horizontal direction / vertical direction, and more preferably 5 or more. Is more preferable. If the thickness of the flat metal lead 7b is too thin, it may break due to thermal expansion and contraction, and if it is too thick, it becomes difficult to bend. Therefore, the thickness is preferably 0.3 mm or more and 1.5 mm or less.
- the frequency of high frequency used for plasma and the like has become higher and higher, for example, a frequency of 13.56 MHz or higher is used. For this reason, it is preferable to increase the surface area so that the high-frequency line can be used without generating heat, particularly in a high frequency field.
- the flat plate is superior in order to increase the surface area with the same cross-sectional area.
- the metal lead 7b may be almost completely flat, or may have a bent portion or a curved portion in the middle.
- the metal lead 7b can be easily bent in the vertical direction with the metal flange portion constituting the grounding part 3. It is preferable that spaces are secured above and below the metal lead 7b except for the connecting portion.
- a bottomed hole 3b into which the lower end portion of the metal rod 7a is fitted is provided in the ground component 3, and the metal lead 7b and the ground component 3 are opposed to each other on the upper surface of the ground component 3. It is preferable to form an inclined groove 3c that gradually becomes deeper toward the hole 3b except in the connection portion between the metal lead 7b and the grounding component 3 in the region to be formed.
- a bottomed hole 3d into which the lower end of the metal rod 7a and the entire metal lead 7b extending in the horizontal direction are fitted is provided in the ground component 3, and the upper surface of the metal lead 7b is the ground component 3 You may connect so that it may surface-contact. In this case, it is preferable to form the connection portion of the ground part 3 with the metal lead 7b in an overhang shape.
- a flat plate-like member is used for the metal lead 7b.
- the member is not limited to such a member, and another shape member may be used as long as it can be deformed in the vertical direction.
- a metal rod 17 a that extends downward in the vertical direction of the conductive connection component 7, and a plate spring-like metal lead that extends in the vertical direction and is curved except for both ends. 17b may be included.
- a part or the whole of the conductive connection part 7 may be formed in a spiral shape.
- the conductive connecting part 7 includes a metal rod 27 a extending vertically downward and a metal lead 27 b formed in a spiral shape except for a connecting part to the ground part 3. Also good.
- the spiral portion is accommodated in a ceramic pipe-shaped support tube 9, or a rod-like shape. It is preferable to wind a spiral portion along the member.
- the cross section of the spiral part may be any shape such as round or flat, but for the most compact structure, a flat lead is made using a thin metal foil and this is spiraled. It is desirable to wind in a shape.
- the material of the metal lead is preferably one that is resistant to repeated fatigue and is less likely to generate particles, such as nickel, inconel, stainless steel, kovar, and iron-nickel alloy.
- Kovar and iron-nickel alloy are preferably subjected to nickel plating in advance. Copper is not preferred as a CVD susceptor because it is a material that is abolished as metal contamination.
- the material of the ground component 3 is generally aluminum alloy or stainless steel in order to avoid generation of particles, but aluminum alloy is preferable for weight reduction.
- the main current path from the embedded high-frequency electrode circuit 5 to the grounding part 3 through the conductive connection part 7 is connected by surface contact.
- the conduction route that bears the main current path as the high-frequency line is characterized by having no point contact portion or sliding portion. Thereby, abnormal overheating and generation
- a conduction route branched from the current path may be separately provided in order to secure a conduction route by surface contact.
- a stranded wire having a relatively large cross-sectional area and a flexible structure can be selected as a current lead for energizing the resistance heating element circuit 4 as a heater for heating.
- the high-frequency current flows intensively on the surface of the conductive connection component 7. Since there are many point contact parts, it is not easy to divert current to another strand in each cross section, so abnormal heating may occur in some strands, and high-frequency energization should be continued for a long time. I can't.
- the balance of the L component, C component, and R component of the entire high-frequency system is important, and impedance matching must be performed using a matching box.
- an error mode may occur when plasma is applied if the high-frequency conduction line physically moves inside the support member 2 every time it is transferred to the apparatus. Therefore, it is not preferable from the viewpoint of reproducibility to connect using a flexible electric wire such as a stranded wire simply because it has flexibility. In other words, it is necessary to have a structure that can maintain a certain characteristic over the long term.
- the fixing point of the conductive connecting part 7 and the grounding part 3 is shifted in the horizontal direction with respect to the direction of thermal expansion / contraction of the conductive connecting part 7 via a flexible member. It is based on a new concept such as fixing, and with regard to a practical fixing method, the conductivity is collected at the same time or after the gathering of our wisdom and fixing the pipe-shaped support member 2 to the grounding part 3. The structure is excellent in originality in which the connection component 7 and the ground component 3 are tightened with screws.
- the support member 2 that supports the wafer holding unit 1 is not particularly limited with respect to the shape, and an arbitrary shape can be adopted, but it has a simple structure and has high mechanical strength. Pipe shape is more desirable.
- the support member 2 may be physically fixed to the wafer holding unit 1 or may be chemically bonded. In order to reduce the stress acting on the wafer holding unit 1, it is preferable to physically fix the support member 2 by a method such as screwing instead of chemically bonding the support member 2 using a brazing material or glass. .
- the temperature of the support member 2 is high in the vicinity of the wafer holding unit 1, and conversely, the temperature is low on the opposite side, so that the support member 2 is easily deformed due to this temperature difference. If the support member 2 at this time is chemically bonded to the wafer holding unit 1, the deformation of the support member 2 affects the wafer holding unit 1, and stress acting on the wafer holding unit 1 is increased, which is not preferable.
- Ceramic materials such as an alumina, aluminum nitride, silicon nitride, silicon carbide, or its composite_body
- the raw material powder of AlN used preferably has a specific surface area of 2.0 to 10.0 m 2 / g. When the specific surface area is less than 2.0 m 2 / g, the sinterability of aluminum nitride is lowered. When the specific surface area is more than 10.0 m 2 / g, the agglomeration of the powder becomes very strong and handling becomes difficult.
- the amount of oxygen contained in the raw material powder is preferably 2% by weight or less. When the amount of oxygen exceeds 2% by weight, the thermal conductivity of the sintered body decreases.
- the total amount of metal impurities other than aluminum contained in the raw material powder is preferably 2000 ppm or less.
- the thermal conductivity of the sintered body decreases.
- group 4 elements such as Si and iron group elements such as Fe as metal impurities have a high effect of reducing the thermal conductivity of the sintered body, and therefore the content is preferably 1000 ppm or less.
- AlN is a hardly sinterable material
- a sintering aid to be added.
- a rare earth element compound or an alkaline earth metal compound is preferable. These compounds react with the aluminum oxide or aluminum oxynitride present on the surface of the aluminum nitride powder particles during the sintering to promote the densification of the aluminum nitride and the thermal conductivity of the aluminum nitride sintered body. Therefore, the thermal conductivity of the aluminum nitride sintered body can be improved.
- the amount of sintering aid added is preferably in the range of 0.01 to 5% by weight. When the addition amount is less than 0.01% by weight, it is difficult to obtain a dense sintered body, and the thermal conductivity of the sintered body is lowered. If the added amount exceeds 5% by weight, a sintering aid exists at the grain boundary of the aluminum nitride sintered body. Therefore, when used in a corrosive atmosphere, the sintering aid present at this grain boundary. Is etched, causing degranulation and generation of particles. More preferably, the addition amount of the sintering aid is 1% by weight or less. If the added amount is 1% by weight or less, the sintering aid does not exist at the triple point of the grain boundary, so that the corrosion resistance of the sintered body is further improved.
- rare earth element compounds are preferable, and yttrium compounds that have a remarkable function of removing oxygen are particularly preferable.
- oxides, nitrides, fluorides, stearic acid compounds, and the like can be used as rare earth element compounds.
- oxides are preferable in that they are inexpensive and easily available.
- the stearic acid compound has high affinity with the organic solvent, mixing the AlN raw material powder and the sintering aid with the organic solvent is preferable because the mixing property is increased.
- AlN raw material powder and sintering aid powder are mixed with a predetermined amount of solvent, binder and, if necessary, a dispersant and a glaze.
- a mixing method ball mill mixing, ultrasonic mixing, or the like is possible.
- a raw material slurry can be obtained by such mixing.
- By molding and sintering the obtained raw material slurry an AlN sintered body serving as a wafer holding part can be obtained.
- the method two types of methods, a cofire method and a post metallization method, are possible.
- Granules are produced from the raw material slurry by a technique such as a spray dryer.
- the granules are filled into a predetermined mold and press-molded.
- the pressing pressure is desirably 9.8 MPa or more. When the pressure is less than 9.8 MPa, the strength of the molded body is often not sufficiently obtained, and is easily damaged by handling.
- the density of a molded object changes with content of a binder, and the addition amount of a sintering auxiliary agent, it is preferable that it is 1.5 g / cm ⁇ 3 > or more. If it is less than 1.5 g / cm 3 , the distance between the raw material powder particles becomes relatively large, so that sintering does not proceed easily. Moreover, it is preferable that a molded object density is 2.5 g / cm ⁇ 3 > or less. If it exceeds 2.5 g / cm 3 , it is difficult to sufficiently remove the binder in the molded body by the degreasing process in the next step, and it becomes difficult to obtain a dense sintered body as described above.
- the obtained molded body is degreased by heating in a non-oxidizing atmosphere such as nitrogen or argon.
- a non-oxidizing atmosphere such as nitrogen or argon.
- the degreasing treatment is performed in an oxidizing atmosphere such as the air, the surface of the AlN powder is oxidized, so that the thermal conductivity of the sintered body is lowered.
- the heating temperature for the degreasing treatment is preferably 500 to 1000 ° C. When the temperature is less than 500 ° C., the binder cannot be sufficiently removed, and excessive carbon remains in the molded body after the degreasing treatment, which hinders sintering in the subsequent sintering step.
- the amount of remaining carbon becomes too small, so the ability of the oxide film present on the surface of the AlN powder to remove oxygen is lowered, and the thermal conductivity of the sintered body is lowered.
- the amount of carbon remaining in the molded body after the degreasing treatment is preferably 1.0% by weight or less. If carbon exceeding 1.0% by weight remains, sintering is hindered, so that a dense AlN sintered body cannot be obtained.
- the degreased compact is sintered.
- This sintering is performed at a temperature of 1700 to 2000 ° C. in a non-oxidizing atmosphere such as nitrogen or argon.
- the moisture contained in the atmospheric gas such as nitrogen used at this time is preferably -30 ° C. or less in terms of dew point.
- AlN reacts with moisture in the atmospheric gas during sintering to form oxynitrides, which may reduce the thermal conductivity.
- the amount of oxygen in the atmospheric gas is preferably 0.001% by volume or less. If the amount of oxygen exceeds this value, the surface of AlN may oxidize and the thermal conductivity may decrease.
- a boron nitride (BN) molded body is suitable as a jig used for placing the molded body during sintering.
- This BN compact has sufficient heat resistance with respect to the sintering temperature, and its surface has solid lubricity, so that the friction between the jig and the compact when the compact shrinks during sintering.
- an AlN sintered body with less distortion can be obtained.
- the obtained AlN sintered body is subjected to machining such as surface polishing as necessary.
- the surface roughness of the sintered body is preferably 5 ⁇ m or less in terms of Ra. If the thickness exceeds 5 ⁇ m, defects such as pattern bleeding and pinholes are likely to occur when a circuit is formed by screen printing. More preferably, the surface roughness is 1 ⁇ m or less in terms of Ra.
- the parallelism of both processed surfaces is preferably 0.5 mm or less. If the parallelism exceeds 0.5 mm, the thickness of the conductive paste may vary greatly during screen printing.
- the parallelism is particularly preferably 0.1 mm or less.
- the flatness of the screen printing surface is preferably 0.5 mm or less. This is because even when the flatness exceeds 0.5 mm, the variation in the thickness of the conductive paste may increase.
- the flatness is particularly preferably 0.1 mm or less.
- a conductive paste is applied to the polished AlN sintered body by screen printing to form an electric circuit pattern.
- the conductive paste can be obtained by mixing a metal powder with a binder and a solvent.
- tungsten, molybdenum or tantalum is preferable from the viewpoint of matching the thermal expansion coefficient with ceramics.
- an oxide powder may be added to the conductive paste.
- the oxide powder is preferably a group 3A element, a group 3A element oxide, Al 2 O 3 , SiO 2 or the like.
- yttrium oxide is preferable because it has very good wettability to AlN.
- the amount of these oxide powders added is preferably 0.1 to 30% by weight. If it is less than 0.1% by weight, the adhesion strength between the metal layer, which is the formed electric circuit, and AlN is lowered. Conversely, if it exceeds 30% by weight, the electrical resistance value of the metal layer, which is an electrical circuit, becomes high.
- the thickness of the conductive paste is preferably 5 ⁇ m or more and 100 ⁇ m or less after drying.
- the thickness is less than 5 ⁇ m, not only the electric resistance value becomes too high, but also the adhesion strength decreases. Moreover, when thickness exceeds 100 micrometers, adhesion strength falls.
- the circuit pattern to be formed is a resistance heating element circuit
- the pattern interval is preferably 0.1 mm or more. If the interval is less than 0.1 mm, when a current is passed through the resistance heating element, a leakage current may occur depending on the applied voltage and temperature, causing a short circuit.
- the pattern interval is preferably 1 mm or more, more preferably 3 mm or more.
- the conductive paste is degreased and fired.
- Degreasing is performed in a non-oxidizing atmosphere such as nitrogen or argon.
- the degreasing temperature is preferably 500 ° C. or higher. When the degreasing temperature is less than 500 ° C., removal of the binder in the conductive paste is insufficient, carbon remains in the metal layer, and metal carbide is formed when fired, so that the electric resistance value of the metal layer is increased.
- Calcination of the conductive paste after degreasing is preferably performed at a temperature of 1500 ° C. or higher in a non-oxidizing atmosphere such as nitrogen or argon.
- a non-oxidizing atmosphere such as nitrogen or argon.
- the firing temperature should not exceed the sintering temperature of the ceramic.
- the conductive paste is fired at a temperature exceeding the sintering temperature of the ceramic, the sintering aid contained in the ceramic begins to evaporate, and further, the grain growth of the metal powder in the conductive paste is promoted, and the ceramic and the metal layer. This is because the adhesion strength to the lowers.
- an insulating coat can be formed on the metal layer.
- the material of the insulating coating is not particularly limited as long as it has a low reactivity with the metal layer and the difference in thermal expansion coefficient from AlN is 5.0 ⁇ 10 ⁇ 6 / K or less.
- crystallized glass or AlN can be used.
- the amount of sintering aid added to the paste is preferably 0.01% by weight or more. If it is less than 0.01% by weight, the insulating coating is not densified, and it is difficult to ensure the insulating properties of the metal layer. Moreover, it is preferable that the amount of sintering aid does not exceed 20% by weight. If it exceeds 20% by weight, an excessive sintering aid penetrates into the metal layer, so that the electrical resistance value of the metal layer may change.
- coats a paste It is preferable that it is 5 micrometers or more. This is because if it is less than 5 ⁇ m, it is difficult to ensure insulation.
- a metal oxide to these metal powders.
- a metal oxide aluminum oxide, silicon oxide, copper oxide, boron oxide, zinc oxide, lead oxide, rare earth oxide, transition metal element oxide, alkaline earth metal oxide, or the like can be added.
- the addition amount is preferably 0.1% by weight or more and 50% by weight or less. If the content is less than this, the adhesion with aluminum nitride is lowered, which is not preferable. Further, if the content is higher than this, sintering of metal components such as silver is inhibited, which is not preferable.
- the above metal powder and metal oxide powder are mixed, an organic solvent and a binder are further added to form a paste, and then a circuit pattern is formed by screen printing in the same manner as described above.
- the formed circuit pattern is baked in a temperature range of 700 ° C. to 1000 ° C. in an inert gas atmosphere such as nitrogen or in the air.
- an insulating layer can be formed by applying crystallized glass, glaze glass, organic resin, or the like and firing or curing in order to ensure insulation between circuits.
- glass borosilicate glass, lead oxide, zinc oxide, aluminum oxide, silicon oxide and the like can be used.
- An organic solvent and a binder are added to these powders to form a paste, which is applied by screen printing.
- the firing temperature is preferably lower than the temperature at which the circuit is formed. Baking at a higher temperature than the circuit baking is not preferable because the resistance value of the circuit pattern changes greatly.
- a ceramic substrate is further laminated.
- Lamination of the ceramic substrate is preferably performed via a bonding agent.
- a bonding agent a paste obtained by adding a group 2A element compound or a group 3A element compound, a binder or a solvent to aluminum oxide powder or aluminum nitride powder, and applying the paste onto the bonding surface by a method such as screen printing.
- a bonding agent it is preferable that it is 5 micrometers or more. When the thickness is less than 5 ⁇ m, bonding defects such as pinholes and bonding unevenness easily occur in the bonding layer.
- the ceramic substrate coated with the bonding agent is degreased at a temperature of 500 ° C. or higher in a non-oxidizing atmosphere. Thereafter, the ceramic substrates to be stacked are superposed, a predetermined load is applied, and the ceramic substrates are bonded together by heating in a non-oxidizing atmosphere.
- the applied load is preferably 5 kPa or more. When the load is less than 5 kPa, sufficient bonding strength cannot be obtained or bonding defects are likely to occur.
- the heating temperature at the time of bonding is not particularly limited as long as the ceramic substrates are sufficiently adhered to each other through the bonding layer, but is preferably 1500 ° C. or higher. If it is less than 1500 degreeC, sufficient joint strength is hard to be obtained and it will be easy to produce a joint defect. Nitrogen, argon, or the like is preferably used for the non-oxidizing atmosphere during the degreasing and bonding.
- a ceramic laminated sintered body serving as a wafer holder of the wafer holder can be obtained.
- a resistance heating element circuit for example, a molybdenum wire (coil), an electrostatic chuck electrode circuit, a high-frequency electrode circuit, etc. It is also possible to use a mesh (net-like body).
- the molybdenum coil or mesh is incorporated in the AlN raw material powder, and can be produced by a hot press method.
- the hot press temperature and atmosphere may be the same as the sintering temperature and atmosphere of AlN, but the hot press pressure is preferably 1.0 MPa or more. When the hot press pressure is less than 1.0 MPa, a gap may be formed between the molybdenum coil or mesh and AlN, and the performance as a heater may not be achieved.
- the raw material slurry described above is formed into a sheet by a doctor blade method.
- molding It is preferable that the thickness of a sheet
- An electric circuit pattern having a predetermined shape is formed on the obtained sheet by applying a conductive paste by a method such as screen printing. The same conductive paste as that described in the post metallization method can be used. However, in the cofire method, there is no problem even if the oxide powder is not added to the conductive paste.
- each sheet is set at a predetermined position and overlapped. At this time, a solvent is applied between the sheets as necessary. In the state of being overlaid, heat as necessary. When heating, it is preferable that heating temperature is 150 degrees C or less. When the sheet is heated to a temperature exceeding 150 ° C., the laminated sheet is greatly deformed. Then, the stacked sheets are integrated by applying pressure.
- the applied pressure is preferably in the range of 1 to 100 MPa. If the pressure is less than 1 MPa, the sheets may not be sufficiently integrated and may peel during the subsequent steps. Further, when a pressure exceeding 100 MPa is applied, the deformation amount of the sheet becomes too large.
- This laminate is degreased and sintered in the same manner as the above-mentioned post metallization method.
- the temperature of degreasing and sintering, the amount of carbon, and the like are the same as in the post metallization method.
- a resistance heating element circuit, a high-frequency electrode circuit, an electrostatic chuck electrode circuit, etc. are printed on a plurality of sheets, respectively, and these are stacked to have a plurality of electric circuits. It is also possible to easily produce an energization heating heater. In this way, a ceramic laminated sintered body serving as a wafer holding portion of the wafer holder can be obtained.
- an electrical circuit such as a resistance heating element circuit
- An insulating coating can be formed on the electrical circuit.
- the obtained ceramic laminated sintered body is processed as necessary. This is because the accuracy usually required by a semiconductor manufacturing apparatus is often not satisfied in the sintered state.
- the contact portion of the ring-shaped convex portion or the embossed wafer with the wafer is 0.1 mm or less. If this flatness exceeds 0.5 mm, a gap is likely to be formed between the wafer to be processed and the wafer holder, and the heat of the wafer holder is not uniformly transferred to the workpiece. Temperature unevenness is likely to occur.
- the surface roughness of the wafer mounting surface is preferably 5 ⁇ m or less in terms of Ra.
- Ra exceeds 5 ⁇ m, AlN degranulation may increase due to friction between the wafer holder and the wafer. At this time, the shed particles become particles, which adversely affects processing such as film formation and etching on the wafer.
- the surface roughness is more preferably 1 ⁇ m or less in terms of Ra. As described above, the wafer holding portion of the susceptor in the wafer holder can be manufactured.
- a support member is attached to the wafer holding part thus manufactured.
- the material of the supporting member is not particularly limited as long as it has a thermal expansion coefficient that is not significantly different from the thermal expansion coefficient of the ceramic of the wafer holding part, but the difference in thermal expansion coefficient from the wafer holding part is 5 ⁇ 10 ⁇ 6. / K or less is preferable. When the difference in thermal expansion coefficient exceeds 5 ⁇ 10 ⁇ 6 / K, cracks are likely to occur near the mounting part of the wafer holding part and the support member during chemical joining, especially during joining. Even if it is not, a thermal cycle is applied to the joint portion during repeated use, and cracks and cracks may occur.
- the material of the support member is most preferably AlN, but silicon nitride, silicon carbide, mullite, or the like can also be used.
- the support member can be chemically bonded via a bonding layer.
- the components of the bonding layer in the case of chemical bonding are preferably composed of AlN, Al 2 O 3 and a rare earth oxide. These components are preferable because they have a good wettability with ceramics such as AlN which is a material of the wafer holding part and the support member, so that the bonding strength is relatively high and the airtightness of the bonding surface is easily obtained.
- the flatness of each bonding surface of the supporting member and the wafer holding part to be bonded is 0.5 mm or less. Beyond this, a gap is likely to occur on the joint surface, making it difficult to obtain a joint with sufficient airtightness.
- the flatness is more preferably 0.1 mm or less. It is more preferable that the flatness of the bonding surface of the wafer holding unit is 0.02 mm or less.
- the surface roughness of each joint surface is preferably 5 ⁇ m or less in terms of Ra. In the case of surface roughness exceeding this, a gap is easily generated on the joint surface.
- the surface roughness of the joint surface is more preferably 1 ⁇ m or less in terms of Ra.
- the support member can be attached by a physical (mechanical) method such as screwing.
- a physical (mechanical) method such as screwing.
- the support member can be attached to the wafer holding portion by screwing a male screw formed of a material having a coefficient of thermal expansion relatively close to that of the wafer holding portion or the support member. In this attachment method, it can be fixed inside or outside the support member as described above depending on the application, but in order to reduce the stress acting on the wafer holding part, it is preferable to fix it inside the support member. .
- the wafer holder of the present invention has been described based on the embodiments.
- the present invention is not limited to such embodiments, and can be implemented in various modes without departing from the gist of the present invention. That is, the technical scope of the present invention extends to the claims and their equivalents.
- Example 1 A slurry was prepared by adding 0.5 parts by weight of yttrium oxide as a sintering aid to 99.5 parts by weight of the aluminum nitride powder, adding a binder and an organic solvent, and mixing them with a ball mill. The obtained slurry was spray-dried to produce granules, which were press-molded to produce a compact. Next, this molded body was degreased at 700 ° C. in a nitrogen atmosphere and then sintered at 1850 ° C. in a nitrogen atmosphere to obtain an aluminum nitride sintered body. The obtained sintered body was processed into a diameter of 330 mm and a thickness of 10 mm. At this time, the surface roughness Ra was 0.8 ⁇ m, and the flatness was 50 ⁇ m.
- a W paste is applied by screen printing, degreased at 700 ° C. in a nitrogen atmosphere, and then fired at 1830 ° C. in a nitrogen atmosphere, whereby a resistance heating element circuit is formed on one surface.
- a high frequency electrode circuit was formed on the other surface.
- an aluminum nitride substrate having a thickness of 1 mm on the high-frequency electrode circuit side and a thickness of 9 mm on the resistance heating element circuit side was disposed, and a necessary degreasing firing process was performed through a material mainly composed of aluminum nitride necessary for adhesion. Thereafter, bonding was performed to prepare a wafer holding substrate.
- a counterbore hole reaching the resistance heating element circuit was formed on the wafer holding substrate, and a W electrode part plated with Ni for supplying power to the resistance heating element circuit was brought into contact with it to secure a feeding electrode line. .
- a high-frequency electrode line was secured by contacting a high-frequency electrode circuit as a base circuit for high-frequency application with a W-made electrode part plated with Ni.
- These electrode parts have a vertically downward M3 bolt terminal structure, and a 4 mm diameter Ni conductive connection part having an M3 female screw structure is screwed in and connected thereto.
- an M6 bottomed female screw hole for loading a metal bolt for fixing a ceramic pipe-like support member is formed on the surface opposite to the surface to be processed of the wafer holding substrate.
- a metal bolt is inserted into a through hole provided in advance in a flange portion of a ceramic pipe-like support member with respect to the wafer holding portion in which the metal bolt thus fabricated is embedded, and a metal nut is used.
- a ceramic support member was fixed to the wafer support.
- the other end of the pipe-like support member was attached with an aluminum grounding part for connection to the chamber.
- This grounding part has a hole in the vertical direction, and two conductive connecting parts for feeding are electrically taken out of the chamber system through an airtight connector terminal attached to this hole.
- the conductive connection parts from the high-frequency electrode circuit are structured to be electrically connected to the ground parts.
- the 4 mm diameter conductive connection part from the high frequency electrode circuit has a vertically downward M3 bolt structure.
- a plate-shaped Ni metal lead having a length of 35 mm, a width of 6 mm, and a thickness of 0.5 mm was prepared for high-frequency line connection, and two 3.2 mm diameter holes were drilled in this.
- the M3 bolt portion of the conductive connecting part was inserted into one of these 3.2 mm diameter holes drilled in the metal lead, and fixed using an M3 nut.
- FIG. 3A Another M3 bolt was inserted into the other 3.2 mm diameter hole drilled in the horizontally extending flat plate-shaped current lead and connected to the grounding part.
- This wafer holder has a structure in which the conductive line for the high-frequency electrode circuit is connected to a flat metal lead extending in the horizontal direction from the lower part of the conductive connection component.
- the conductive connecting component is thermally expanded, the flat metal lead is bent and the thermal expansion can be absorbed.
- the flat metal lead can be easily bent to easily absorb thermal expansion.
- the wafer holder having the above structure When the wafer holder having the above structure is used as a parallel plate type high-power plasma CVD susceptor, plasma is formed in a state where power is supplied to the electrode line of the resistance heating element circuit and heated to 550 ° C.
- the high-frequency electrode circuit embedded in layers in the wafer holding portion is used as a parallel plate lower electrode, and the lower electrode in which the high-frequency electrode line is grounded via a ground component, and the shower head of the upper electrode
- a high frequency of 13.56 MHz, 100 V, and 2 kW between them and flowing a reaction gas plasma can be formed and a desired film can be deposited on the wafer.
- Example 2 As a conductive connection part for a high-frequency electrode circuit, a stainless steel foil having a width of 8 mm and a thickness of 0.3 mm is prepared instead of the flat metal lead of Example 1, and a rod-shaped jig having an outer diameter of 5 mm is used as a core material. As above, after winding in advance so that the stainless steel foils do not overlap each other, the jig is removed so that it follows the inner wall of the electrode protecting ceramic pipe having an outer diameter of 10 mm and an inner diameter of 6 mm having an opening on the lower side.
- Example 3 As a conductive connection part for a high-frequency electrode circuit, instead of the flat metal lead of Example 1, a stainless steel flat plate having a width of 8 mm and a thickness of 1 mm is bent entirely except for both ends to form a leaf spring.
- a wafer holder having a structure as shown in FIG. 4 was fabricated by extending one end of the substrate in the vertical direction and connecting one end to an electrode part and directly screwing the other end to an earth part serving as an earth part. This was subjected to the same long-term reliability test as in Example 1. As a result, it was possible to continuously apply 100,000 shots of plasma stably.
- Example 4 A wafer holder was produced in the same manner as in Example 1 except that the flat metal leads were made of various materials and sizes shown in Table 1 below. These samples 1 to 11 were subjected to plasma application 100 times under the same plasma application conditions as in Example 1 and observed for problems. As a result, the observation results shown in Table 1 below were obtained.
- Example 1 A wafer holder was produced in the same manner as in Example 1 except that the metal rod 57 was directly fixed to the grounding component 3 as shown in FIG. When plasma was applied to this wafer holder under the same plasma application conditions as in Example 1, the metal rod 57 pushed up the wafer holder 1 when the 32nd wafer was processed. There was a problem that the wafer holder 1 was damaged.
- the metal rod 57 which is a conductive connecting part for a high-frequency electrode circuit, undergoes thermal expansion in a high temperature state, and the wafer holding unit 1 is lowered to eliminate the stress caused by the thermal expansion difference from the wafer support unit 1. It is considered that the stress that pushes up from the wafer works, and that the wafer holding unit 1 has been damaged by repeated application of high-power plasma.
- a slit is provided in the lower portion of the metal rod 67, and a contact 67a called a coil-shaped spring contact is interposed to electrically and mechanically contact the grounding part 3.
- a wafer holder was produced.
- two types of materials were used, a beryllium copper type capable of supplying high power and a stainless steel type having a strong repulsive force. Plasma was applied to these wafer holders.
- the difference between the beryllium copper type and the stainless steel type is that the beryllium copper type was worn early but it was shunted to other coil windings because of its low electrical resistance. However, it seems that the plasma flickering phenomenon was observed when the contact portion was incomplete. In the case of stainless steel type, wear is less likely to occur compared to beryllium copper, but once wear begins, it cannot be shunted to other coil windings due to the high electrical resistance, causing an avalanche phenomenon and the entire spring coil It seems that the plasma could not be applied due to burning.
- Example 3 A wafer holder was produced in the same manner as in Example 1 except that a twisted wire 77 having crimp terminals attached to both ends as shown in FIG. The wafer holder was subjected to plasma application 100 times under the same plasma application conditions as in Example 1 and observed for problems. As a result, when 2 kW of plasma was applied, flicker was observed about three times in 100 shots, and stable plasma application was not possible. This is considered to occur because the structure of the stranded wire 77 has many portions having only point contacts in the main current path.
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Abstract
Description
窒化アルミニウム粉末99.5重量部に焼結助剤として酸化イットリウム0.5重量部を加え、更にバインダー、有機溶剤を加えてボールミル混合することによってスラリーを作製した。得られたスラリーをスプレードライすることにより顆粒を作製し、これをプレス成形して成形体を作製した。次に、この成形体を窒素雰囲気中にて700℃の条件で脱脂した後、窒素雰囲気中において1850℃で焼結して窒化アルミニウム焼結体を得た。得られた焼結体を、直径330mm、厚み10mmに加工した。このときの表面粗さはRaで0.8μm、平面度は50μmであった。
高周波電極回路用の導電性接続部品として、実施例1の平板状の金属リードに代えて、幅8mm、厚さ0.3mmのステンレス箔を準備し、棒状の外径5mmの治具を芯材として、その周りにステンレス箔同士が互いにオーバーラップしないように予め巻きつけた後、治具を取り除き、下側に開口部を有する外径10mm、内径6mmの電極保護用セラミックスパイプの内壁に沿うように装てんし、その下部開口部からステンレス箔の端部を取り出してそこに穴を開け、アース部となるアース部品に直接ねじ止めを行って図5に示すような構造のウエハ保持体を作製した。これに上記実施例1と同様の長期信頼性試験を行った。その結果、100,000ショットのプラズマを安定して印加し続けることが可能であった。
高周波電極回路用の導電性接続部品として、実施例1の平板状の金属リードに代えて、幅8mm、厚さ1mmのステンレス平板を両端部を除いて全体的に湾曲させて板バネとし、これを鉛直方向に延在して一端部を電極部品に接続すると共に、他端部をアース部となるアース部品に直接ねじ止めを行って図4に示すような構造のウエハ保持体を作製した。これに実施例1と同様の長期信頼性試験を行った。その結果、100,000ショットのプラズマを安定して印加し続けることが可能であった。
平板状の金属リードを、下記表1に示す種々の材料及びサイズにした以外は実施例1と同様にしてウエハ保持体を作製した。これら試料1~11に対して、実施例1と同様のプラズマ印加条件で100回のプラズマ印加を行い、問題が生じないか観察した。その結果、下記表1に示す観察結果が得られた。
図6に示すような、金属ロッド57をアース部品3に直接固定した以外は実施例1と同様にしてウエハ保持体を作製した。このウエハ保持体に対して、実施例1と同様のプラズマ印加条件でプラズマ印加を行なったところ、32枚目のウエハ処理を行った段階で、金属ロッド57がウエハ保持部1を突き上げてしまい、ウエハ保持部1が破損してしまうトラブルが発生した。
図7に示すような、金属ロッド67の下部にスリットを設け、コイル状のスプリングコンタクトと呼ばれる接触子67aを介在させてアース部品3に電気的、機械的に接触させた以外は実施例1と同様にしてウエハ保持体を作製した。その際、材質として高電力通電可能なベリリウム銅タイプと、強度的に反発力のあるステンレスタイプの2種を使用した。これらウエハ保持体に対して、プラズマ印加を行なった。
図8に示すような、両端に圧着端子を取り付けた撚り線77を用い、直接アース部品3にねじ止め固定を行った以外は実施例1と同様にしてウエハ保持体を作製した。このウエハ保持体に対して、実施例1と同様のプラズマ印加条件で100回のプラズマ印加を行い、問題が生じないか観察した。その結果、2kWのプラズマ印加にすると、100ショットに3回程度ちらつきが見られ、安定したプラズマ印加ができなくなった。これは、撚り線77の構造が、主たる電流パスの中に点接触しかない部分を多く抱えたものであるために発生しているものと思われる。
2 支持部材
3 アース部品
4 抵抗発熱体回路
5 高周波電極回路
6 抵抗発熱体回路用の導電性接続部品
7 高周波電極回路用の導電性接続部品
7a、17a、27a 金属ロッド
7b、17b、27b 金属リード
10 ウエハ保持体
Claims (5)
- チャンバー内に設置され、高周波電極回路が埋設されたウエハ保持部と、該ウエハ保持部をそのウエハ載置面の反対側の面から支持する支持部材と、該支持部材に関してウエハ保持部の反対側に設けられたアース部品と、該支持部材の内部に挿通され、該高周波電極回路と該アース部品とを電気的に接続する導電性接続部品とを有するウエハ保持体であって、該導電性接続部品は鉛直方向に変形能を有し、かつ、導電性接続部品の主たる電流パスを担う接続部分が面接触で固着していることを特徴とするウエハ保持体。
- 前記導電性接続部品は、前記高周波電極回路に接続する鉛直方向下向きに延在する金属製の剛性部材と、該剛性部材に接続する可とう性部材とを有することを特徴とする、請求項1に記載のウエハ保持体。
- 前記可とう性部材は、鉛直方向下向きに延在するらせん状部材若しくは板バネ状部材、又は水平方向に延在する平板状部材であることを特徴とする、請求項2に記載のウエハ保持体。
- 前記導電性接続部品と前記アース部品との接続部分が、前記支持部材と前記アース部品との接続と同時又はその後に接続可能な構造であることを特徴とする、請求項1~3のいずれかに記載のウエハ保持体。
- 請求項1~4のいずれかに記載のウエハ保持体を搭載していることを特徴とする半導体製造装置。
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CN2010800016762A CN102047383A (zh) | 2009-03-27 | 2010-03-17 | 改善高频电极的连接方法的晶片保持体及搭载该晶片保持体的半导体制造装置 |
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JP2009080166A JP2010232532A (ja) | 2009-03-27 | 2009-03-27 | 高周波電極の接続方法を改善したウエハ保持体及びそれを搭載した半導体製造装置 |
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JP5891953B2 (ja) * | 2012-05-31 | 2016-03-23 | 新東工業株式会社 | 支持部材、加熱プレート支持装置及び加熱装置 |
US9088085B2 (en) * | 2012-09-21 | 2015-07-21 | Novellus Systems, Inc. | High temperature electrode connections |
JP6093010B2 (ja) * | 2013-04-26 | 2017-03-08 | 京セラ株式会社 | 試料保持具 |
WO2016117424A1 (ja) * | 2015-01-20 | 2016-07-28 | 日本碍子株式会社 | シャフト端部取付構造 |
KR102099382B1 (ko) * | 2015-10-07 | 2020-04-13 | 주식회사 원익아이피에스 | 기판처리장치 |
JP7038496B2 (ja) * | 2017-07-06 | 2022-03-18 | 日本特殊陶業株式会社 | 半導体製造装置用部品、および、半導体製造装置用部品の製造方法 |
JP6609735B2 (ja) * | 2017-08-28 | 2019-11-27 | 株式会社クリエイティブテクノロジー | 静電式ワーク保持方法,静電式ワーク保持システム及びワーク保持装置 |
JP2020092195A (ja) * | 2018-12-06 | 2020-06-11 | 東京エレクトロン株式会社 | プラズマ処理装置及びプラズマ処理方法 |
CN113402281A (zh) * | 2021-08-03 | 2021-09-17 | 合肥商德应用材料有限公司 | 发热体及其制备方法和应用 |
KR102595913B1 (ko) | 2022-08-01 | 2023-10-31 | 주식회사 미코세라믹스 | 세라믹 서셉터 |
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- 2010-03-17 CN CN2010800016762A patent/CN102047383A/zh active Pending
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CN102047383A (zh) | 2011-05-04 |
TW201036103A (en) | 2010-10-01 |
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