WO2018230408A1 - 半導体基板加熱用基板載置台および半導体基板加熱ヒータ - Google Patents
半導体基板加熱用基板載置台および半導体基板加熱ヒータ Download PDFInfo
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- WO2018230408A1 WO2018230408A1 PCT/JP2018/021661 JP2018021661W WO2018230408A1 WO 2018230408 A1 WO2018230408 A1 WO 2018230408A1 JP 2018021661 W JP2018021661 W JP 2018021661W WO 2018230408 A1 WO2018230408 A1 WO 2018230408A1
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- heating
- substrate mounting
- mounting table
- semiconductor substrate
- heat generating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67098—Apparatus for thermal treatment
- H01L21/67103—Apparatus for thermal treatment mainly by conduction
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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
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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
- H01L21/68757—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by a coating or a hardness or a material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/687—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68785—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by the mechanical construction of the susceptor, stage or support
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0202—Switches
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/023—Industrial applications
- H05B1/0233—Industrial applications for semiconductors manufacturing
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
- H05B3/03—Electrodes
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
Definitions
- the present disclosure relates to a substrate mounting table for heating a semiconductor substrate and a semiconductor substrate heater.
- This application claims priority based on Japanese Patent Application No. 2017-116606 filed on June 14, 2017, and incorporates all the description content described in the above Japanese application.
- the substrate heater includes a substrate mounting table made of a ceramic disk-shaped member having a flat substrate mounting surface on the upper surface, and a cylindrical shape that supports the substrate mounting table from the lower surface side. And a support. Inside the substrate mounting table, a heating circuit such as an electric heating coil or a patterned metal thin film is embedded in a plane parallel to the substrate mounting surface. A pair of electrode terminals provided on the lower surface side of the substrate mounting table are electrically connected to both ends of the heat generating circuit, and the heat generating circuit is connected from an external power source through the pair of electrode terminals and the lead wires. Is supplied with power.
- the circuit pattern of the heat generating circuit is made minute so that temperature unevenness does not occur, or the substrate mounting surface is divided into a plurality of zones (multi-zones), and power is individually supplied to the heat generating circuits arranged in each of them.
- the temperature is finely controlled for each zone.
- a substrate mounting table for heating a semiconductor substrate is a ceramic semiconductor substrate having one surface as a mounting surface of a semiconductor substrate and a connecting portion of a cylindrical support on a surface opposite to the mounting surface.
- a substrate support for heating wherein the cylindrical support is provided at a central portion of a surface opposite to the placement surface of the substrate placement table, and a plurality of heating circuits provided inside the substrate placement table.
- a plurality of electrode terminals provided in an inner region connected to each other, and each one end portion of at least two of the heat generating circuits is a common electrode terminal that is one of the electrode terminals.
- the semiconductor substrate heating substrate mounting table is connected through a common extension.
- this application discloses the semiconductor substrate heater which has the said substrate mounting base for semiconductor substrate heating, and a cylindrical support body.
- FIG. 1 is a schematic vertical sectional view of an embodiment of a semiconductor substrate heater having a substrate mounting table according to the present disclosure.
- FIG. 2 is a specific example of the circuit pattern of the heat generating circuit embedded in the central zone of the substrate mounting table of FIG.
- FIG. 3 is a first specific example of the circuit pattern of the heat generating circuit embedded in the outer peripheral zone of the substrate mounting table of FIG.
- FIG. 4 is a first specific example of a circuit pattern of a heat generating circuit embedded in an outer peripheral zone of a conventional substrate mounting table.
- FIG. 5 is a second specific example of the circuit pattern of the heat generating circuit embedded in the outer peripheral zone of the substrate mounting table of FIG. FIG.
- FIG. 6 shows a second specific example of the circuit pattern of the heat generating circuit embedded in the outer peripheral zone of the conventional substrate mounting table.
- FIG. 7 is a third specific example of the circuit pattern of the heat generating circuit embedded in the outer peripheral zone of the substrate mounting table of FIG.
- FIG. 8 shows a third specific example of the circuit pattern of the heat generating circuit embedded in the outer peripheral zone of the conventional substrate mounting table.
- the atmosphere in the vacuum chamber becomes a corrosive environment. Therefore, it is preferable to isolate the electrode terminal provided so as to protrude to the lower surface side of the substrate mounting table from the atmosphere in the vacuum chamber. Therefore, the upper and lower ends of the cylindrical support are hermetically sealed to the lower surface of the substrate mounting table and the bottom of the vacuum chamber, respectively, and the electrode terminals are installed inside the cylindrical support.
- a cylindrical support is generally used rather than the diameter of the central zone. The inner diameter of is smaller. It is necessary to extend both ends of the heat generating circuit that heats the outer peripheral zone so as to pass through the central zone and to be connected to the electrode terminals installed inside the cylindrical support.
- An embodiment of a substrate mounting table for heating a semiconductor substrate according to the present disclosure is made of a ceramic having one surface as a mounting surface of a semiconductor substrate and a connecting portion of a cylindrical support on a surface opposite to the mounting surface.
- a substrate mounting table for heating a semiconductor substrate wherein a plurality of heat generating circuits provided inside the substrate mounting table and a cylindrical shape at a central portion of a surface opposite to the mounting surface on the substrate mounting table
- a plurality of electrode terminals provided in an inner region to which the support is connected, and each one end of at least two of the heat generating circuits is one of the electrode terminals. It is connected to the terminal via a common extension.
- the structure of the end portion of the heat generating circuit connected to the electrode terminal disposed at the center of the substrate mounting surface can be simplified, so that the substrate mounting can be suppressed while suppressing the adverse effect on the thermal uniformity of the substrate mounting surface.
- the surface can be temperature controlled more precisely.
- the temperature of each of the plurality of heating circuits is individually controlled. Thereby, the temperature of the substrate mounting surface can be controlled more finely.
- the plurality of heat generating circuits heat a central zone heat generating circuit that heats the central zone of the mounting surface and the periphery of the central zone. It comprises a plurality of outer zone heating circuits, and the at least two heating circuits are preferably the outer zone heating circuits. Thereby, the temperature of the outer peripheral zone around it can be finely controlled while suppressing the adverse effect on the thermal uniformity of the inner peripheral zone of the substrate mounting surface.
- the central zone heating circuit and the outer zone heating circuit may be embedded in different planes in the thickness direction of the substrate mounting table.
- the configuration can be simplified by eliminating the interference between the heating circuits and the extended wiring portions to the electrode terminals.
- the central zone heat generating circuit may be composed of a plurality of concentric curved conductive parts centering on the center of the wafer mounting surface and a linear conductive part connecting the adjacent curved conductive parts.
- the outer peripheral zone heat generating circuit includes a plurality of concentric circles each centered on the center of the wafer mounting surface in a plurality of zones obtained by dividing an annular portion surrounding the periphery of the central zone heat generating circuit in the circumferential direction. It is good to be comprised by the curved conductive part and the linear conductive part which connects the said curved conductive part which adjoins. The thermal uniformity of the substrate placement surface can be ensured while simplifying the structure of the end portions of the plurality of heat generating circuits connected to the electrode terminals arranged at the center of the substrate placement surface.
- the present disclosure also includes a semiconductor substrate heater having the above-described semiconductor substrate heating substrate mounting table and a cylindrical support.
- FIG. 1 is a schematic vertical cross-sectional view of an embodiment of a semiconductor substrate heater 3 having a substrate mounting table according to the present disclosure.
- FIG. 1 is not a figure which shows correctly the cross section cut
- FIG. 1 is not a figure which shows correctly the cross section cut
- a semiconductor substrate heater 3 is a substantially disk-shaped substrate, which is preferably made of ceramics and has a substrate mounting surface 1a on which a semiconductor substrate W is mounted as shown in FIG.
- the mounting table 1 is connected by a connecting portion 1b so as to support the mounting table 1 from the lower surface, and has a substantially cylindrical cylindrical support body 2 made of ceramics.
- flange portions bent outward are formed.
- the upper and lower end portions are connected to the lower surface of the substrate mounting table 1 and the vacuum chamber (by a sealing member (not shown) provided on the annular end surface of the flange portion, such as an O-ring (not shown), a gasket, etc. (Not shown) are air-tightly joined to the bottom of each.
- a sealing member not shown
- O-ring not shown
- gasket etc.
- the ceramic that is a suitable material for the substrate mounting table 1 and the cylindrical support 2 include aluminum nitride, silicon nitride, silicon carbide, and aluminum oxide. Of these, aluminum nitride having high thermal conductivity is preferable.
- the substrate mounting table 1 and the cylindrical support 2 are preferably made of the same material, and can be expanded and contracted in the same way during heating and cooling, so that warpage of the substrate mounting surface 1a due to thermal stress can be reduced. Problems such as breakage of the joint between the substrate mounting table 1 and the cylindrical support 2 can be made difficult to occur.
- a central zone heating circuit 10 that heats the central zone of the substrate mounting surface 1a and an annular outer periphery around the central zone are provided inside the substrate mounting table 1.
- Two outer peripheral zone heating circuits 21 and 22 for heating the zone are embedded. These outer peripheral zone heat generating circuits 21 and 22 are embedded in the same plane parallel to the substrate mounting surface 1a, and the central zone heat generating circuit 10 is disposed in a plane closer to the substrate mounting surface 1a than the same plane. Buried. That is, the central zone heat generating circuit 10 and the outer peripheral zone heat generating circuits 21 and 22 are respectively embedded in different planes in the thickness direction of the substrate mounting table 1. Therefore, the central zone heat generating circuit 10 and the outer peripheral zone heat generating circuits 21 and 22 do not physically interfere with each other.
- the central zone heat generating circuit 10 has a circuit pattern as shown in FIG. That is, the central zone heat generating circuit 10 shown in FIG. 2 is formed in a single stroke with a plurality of concentric curved conductive portions and linear conductive portions connecting adjacent ones of the curved conductive portions, Both end portions thereof are disposed in the central portion of the substrate placement surface 1a.
- the electrode terminals 30a and 30b are connected to both ends, respectively.
- the two outer zone heating circuits 21 and 22 have the circuit pattern of the first specific example shown in FIG. That is, in the circuit pattern shown in FIG. 3, the two outer peripheral zone heat generating circuits 21 and 22 are respectively embedded in two sector zones obtained by equally dividing the annular outer peripheral zone into two in the circumferential direction. Each of these two outer zone heating circuits 21 and 22 is formed in a single stroke with a plurality of concentric curved conductive portions and a linear conductive portion connecting adjacent ones of these curved conductive portions, One end portions of the outer peripheral zone heat generating circuits 21 and 22 are connected to the two electrode terminals 31 and 32 via two non-shared extension portions 21a and 22a extending in parallel to each other toward the center of the substrate mounting surface 1a. Each is connected. On the other hand, the other end portions of the two outer peripheral zone heat generating circuits 21 and 22 share one wide shared extension portion 20 toward the center of the substrate mounting surface 1a. It is connected to one common electrode terminal 33.
- the circuit pattern of the outer peripheral zone heat generating circuit of the substrate mounting table of the embodiment of the present disclosure is not limited to the case of FIG. 3, and may be the circuit pattern of the second specific example shown in FIG.
- four substantially identical outer peripheral zone heat generating circuits 221 to 224 are provided in four fan-shaped zones symmetrical with respect to the center point of the substrate mounting surface of the substrate mounting table 200, respectively.
- Each of the four outer peripheral zone heat generating circuits 221 to 224 is formed in a single stroke with a plurality of concentric curved conductive portions and a linear conductive portion connecting adjacent ones of the curved conductive portions.
- each of the outer peripheral zone heat generation circuits 221 to 224 has four electrode terminals 231 to 234 via four non-shared extension portions 221a to 224a that extend in parallel two by two toward the center of the substrate mounting surface. Is connected to each.
- the other end portions of the four outer peripheral zone heat generating circuits 221 to 224 share two shared extended portions 220a and 220b that are wide toward the center of the substrate mounting surface, and two of these shared extended portions are shared. It is connected to one common electrode terminal 235 through the portions 220a and 220b.
- Such a structure can simplify the structure of the end portion of the heat generating circuit connected to the electrode terminal group disposed in the central portion of the substrate mounting surface. Thereby, the temperature of the substrate mounting surface can be controlled more precisely. That is, when the wide shared extension portions 220a and 220b are not adopted, two non-shared extension portions are provided in each of the four outer zone heating circuits 321 to 324, for example, as in the substrate mounting table 300 shown in FIG. Since it is necessary to provide 321a, 321b, 322a, 322b, 323a, 323b, 324a, 324b, the structure of the central portion of the substrate mounting surface becomes complicated.
- the circuit pattern of the outer peripheral zone heat generating circuit of the substrate mounting table may be the circuit pattern of the third specific example shown in FIG.
- six substantially identical outer peripheral zone heat generating circuits 421 to 426 are provided in six fan-shaped zones that are symmetrical with respect to the center point of the substrate mounting surface of the substrate mounting table 400.
- Each of these six outer peripheral zone heat generating circuits 421 to 426 is formed in a single stroke with a plurality of concentric curved conductive portions and linear conductive portions connecting adjacent ones of these curved conductive portions.
- each of the outer peripheral zone heat generation circuits 421 to 426 has six electrode terminals 431 to 436 through six non-shared extension portions 421a to 426a extending in parallel two by two toward the center of the substrate mounting surface. Is connected to each.
- the other outer ends of these six outer peripheral zone heat generating circuits 421 to 426 share three wide extended portions 420a, 420b, and 420c facing the center of the substrate mounting surface. It is connected to one shared electrode terminal 437 through shared extension portions 420a to 420c.
- Such a structure can simplify the structure of the end portion of the heat generating circuit connected to the electrode terminal group disposed in the central portion of the substrate mounting surface. Thereby, the temperature of the substrate mounting surface can be controlled more precisely. That is, when the wide shared extension portions 420a to 420c are not adopted, two non-shared extension portions are provided in each of the six outer peripheral zone heating circuits 521 to 526 as in the substrate mounting table 500 shown in FIG. Since it is necessary to provide 521a, 521b, 522a, 522b, 523a, 523b, 524a, 524b, 525a, 525b, 526a, 526b, the structure of the central portion of the substrate mounting surface becomes complicated.
- each of all the heating circuits embedded in the substrate mounting table is controlled independently.
- the substrate placement surface can be locally heated, so that good thermal uniformity is maintained even when the substrate placement surface is partially cooled by, for example, opening and closing a load lock.
- the end of each heat generating circuit and the electrode terminal can be connected by a joining means such as caulking, welding, brazing, or screwing.
- the semiconductor substrate heating substrate mounting table of the present invention has been described with reference to one embodiment.
- the present invention is not limited to the embodiment, and various aspects within the scope of the present invention can be used. It is possible to implement. That is, the technical scope of the present invention covers the claims and their equivalents.
- a slurry was prepared by adding 0.5 parts by mass of yttrium oxide as a sintering aid to 99.5 parts by mass of the aluminum nitride powder, adding a binder and an organic solvent, and mixing them with a ball mill.
- the obtained slurry was sprayed by a spray drying method to produce granules, which were press-molded to produce three molded bodies.
- These compacts were degreased at 700 ° C. in a nitrogen atmosphere and then sintered at 1850 ° C. in a nitrogen atmosphere to obtain three aluminum nitride sintered bodies.
- the obtained sintered body was processed into a disk shape having a diameter of 330 mm and a thickness of 8 mm. At this time, the surface roughness Ra was 0.8 ⁇ m, and the flatness was 50 ⁇ m.
- a circular concentric circuit pattern shown in FIG. 2 is formed with a line width of 4 mm and a thickness of 20 ⁇ m in a circular central zone having a diameter of 160 mm on the upper surface of the sintered body located in the middle. Therefore, it was applied by screen printing using a tungsten paste. Furthermore, screen printing using tungsten paste is performed to form a circuit pattern of an annular concentric circle shown in FIG. 3 with a line width of 4 mm and a thickness of 20 ⁇ m in an annular outer peripheral zone outside the central zone having a diameter of 160 mm on the lower surface of the same sintered body. was applied. Note that the line width of the shared extension portion was 8 mm. These tungsten pastes were degreased at 700 ° C. in a nitrogen atmosphere and baked at 1830 ° C. to form a heating circuit.
- the sintered body located in the middle was sandwiched between two remaining sintered bodies that were degreased after applying an adhesive material mainly composed of aluminum nitride for adhesion to the opposing surface and joined.
- a bottomed hole is provided on the lower surface of the joined body thus obtained so that the end of the heat generating circuit is exposed, and an external terminal made of tungsten is inserted into the hole to electrically connect the heat generating circuit. Connected.
- a substrate mounting table for Sample 1 was produced.
- the substrate mounting tables for Samples 2 to 6 were produced in the same manner as for Sample 1 except that the circuit patterns shown in FIGS. 4 to 8 were formed in the annular outer peripheral zone instead of the circuit patterns shown in FIG.
- AlN aluminum nitride
- One end of the support member was joined with a screw.
- a gasket was used to hermetically seal between the flange-shaped portion and the bonding surface of the substrate mounting table.
- the lead wire was connected to an external terminal located inside the support member, and the other end of the support member was fixed with a clamp in a state of being hermetically sealed with a gasket at the bottom of the chamber.
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- Power Engineering (AREA)
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Abstract
Description
薄膜処理の際、真空チャンバー内の雰囲気は腐食環境になるので、基板載置台の下面側に突出するようにして設けられている電極端子は、真空チャンバー内の雰囲気から隔離するのが好ましい。そこで、筒状支持体の上下端部を基板載置台の下面及び真空チャンバーの底部にそれぞれ気密にシールすると共に、該電極端子を筒状支持体の内側に設置することが行われている。この場合、基板載置面を例えば中央ゾーンとこれを囲む環状の外周ゾーンとの2ゾーンに区分してそれらの各々に発熱回路を設ける構造では、一般に該中央ゾーンの直径よりも筒状支持体の内径の方が小さい。当該外周ゾーンを加熱する発熱回路の両端部を延長して上記の中央ゾーン内を通過させ、筒状支持体の内側に設置した電極端子に接続させる必要がある。
本開示によれば、基板載置面の中央部に配される電極端子に接続する複数の発熱回路の端部の構造を簡素化できるので、該基板載置面の均熱性への悪影響を抑えながら該基板載置面をより精密に温度制御することが可能になる。
最初に本開示の実施形態を列記して説明する。本開示の半導体基板加熱用基板載置台の実施形態は、一方の面を半導体基板の載置面とし、前記載置面とは反対側の面に筒状支持体の接続部を有するセラミックス製の半導体基板加熱用基板載置台であって、上記基板載置台の内部に設けられた複数の発熱回路と、上記基板載置台の上記載置面とは反対側の面の中央部において、上記筒状支持体が接続される内側領域に設けられた複数の電極端子とを備え、上記発熱回路のうちの少なくとも2つの発熱回路のそれぞれの片端部は、上記電極端子のうちの1つである共用電極端子と、共通する延長部分を介して接続されている。これにより、基板載置面の中央部に配される電極端子に接続する発熱回路の端部の構造を簡素化できるので、該基板載置面の均熱性への悪影響を抑えながら該基板載置面をより精密に温度制御することができる。
これらの中では熱伝導率の高い窒化アルミニウムが好ましい。基板載置台1と筒状支持体2は互いに同じ材質からなるのが好ましく、これにより加熱や冷却の際に同様に膨張や縮小させることができるので、熱応力による基板載置面1aの反りや基板載置台1と筒状支持体2との接合部の破損等の問題を生じにくくすることができる。
1、100、200、300、400、500 基板載置台
1a 基板載置面
1b 接続部
2 筒状支持体
3 半導体基板加熱ヒータ
10 中央ゾーン発熱回路
20 共有延長部分
21、22 外周ゾーン発熱回路
21a、22a 非共有延長部分
30a、30b、31、32 電極端子
33 共用電極端子
121、122 外周ゾーン発熱回路
121a、121b、122a、122b 非共有延長部分
220a、220b 共有延長部分
221~224 外周ゾーン発熱回路
221a~224a 非共有延長部分
231~234 電極端子
235 共用電極端子
321~324 外周ゾーン発熱回路
321a、321b、322a、322b、323a、323b、324a、324b 非共有延長部分
420a、420b、420c 共有延長部分
421~426 外周ゾーン発熱回路
421a~426a 非共有延長部分
431~436 電極端子
437 共用電極端子
521~526 発熱回路
521a、521b、522a、522b、523a、523b、524a、524b、525a、525b、526a、526b 延長部分
Claims (6)
- 一方の面を半導体基板の載置面とし、前記載置面とは反対側の面に筒状支持体の接続部を有するセラミックス製の半導体基板加熱用基板載置台であって、
前記基板載置台の内部に設けられた複数の発熱回路と、
前記基板載置台の前記載置面とは反対側の面の中央部において、前記筒状支持体が接続される内側領域に設けられた複数の電極端子とを備え、
前記発熱回路のうちの少なくとも2つの発熱回路のそれぞれの片端部は、前記電極端子のうちの1つである共用電極端子と、共通する延長部分を介して接続されている、
半導体基板加熱用基板載置台。 - 前記複数の発熱回路は各々個別に温度制御される、
請求項1に記載の半導体基板加熱用基板載置台。 - 前記複数の発熱回路は、
前記載置面の中央ゾーンを加熱する中央ゾーン発熱回路と、
前記中央ゾーンの周りを加熱する複数の外周ゾーン発熱回路とからなり、
前記少なくとも2つの発熱回路は、前記外周ゾーン発熱回路である、
請求項1または請求項2に記載の半導体基板加熱用基板載置台。 - 前記中央ゾーン発熱回路は、前記ウエハ載置面の中心を中心とする同心円状の複数の湾曲導電部と、隣接する前記湾曲導電部を接続する直線導電部とで構成され、
前記外周ゾーン発熱回路は、前記中央ゾーン発熱回路の周囲を囲む円環状の部分を周方向に区分した複数のゾーンにおいて、それぞれ前記ウエハ載置面の中心を中心とする同心円状の複数の湾曲導電部と、隣接する前記湾曲導電部を接続する直線導電部とで構成されている、
請求項3に記載の半導体基板加熱用基板載置台。 - 請求項1から請求項4のいずれか1項に記載の半導体基板加熱用基板載置台と、筒状支持体とを有する、半導体基板加熱ヒータ。
- 一方の面を半導体基板の載置面とするセラミックス製の基板載置台と、
前記基板載置台の前記載置面とは反対側の面の中央部に接続されたセラミックス製の筒状支持体とを有し、
前記基板載置台は、中央ゾーン発熱回路と、
前記中央ゾーン発熱回路とは前記基板載置台の厚み方向において異なる平面内に埋設された複数の外周ゾーン発熱回路と、
前記基板載置台の前記載置面とは反対側の面において、前記筒状支持体が接続される内側領域に設けられた複数の電極端子とを備え、
前記外周ゾーン発熱回路のうちの少なくとも2つの発熱回路のそれぞれの片端部は、前記電極端子のうちの1つの共用電極端子と、共通する延長部分を介して接続されている、
半導体基板加熱ヒータ。
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