WO2011046052A1 - 電極板の通気孔形成方法 - Google Patents
電極板の通気孔形成方法 Download PDFInfo
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- WO2011046052A1 WO2011046052A1 PCT/JP2010/067528 JP2010067528W WO2011046052A1 WO 2011046052 A1 WO2011046052 A1 WO 2011046052A1 JP 2010067528 W JP2010067528 W JP 2010067528W WO 2011046052 A1 WO2011046052 A1 WO 2011046052A1
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- electrode plate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/60—Preliminary treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
- B23K26/382—Removing material by boring or cutting by boring
- B23K26/389—Removing material by boring or cutting by boring of fluid openings, e.g. nozzles, jets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/32532—Electrodes
- H01J37/32541—Shape
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/32715—Workpiece holder
- H01J37/32724—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
- B23K2101/40—Semiconductor devices
Definitions
- the present invention relates to a method for forming air holes in an electrode plate for a plasma processing apparatus.
- the present application claims priority based on Japanese Patent Application No. 2009-236694 filed in Japan on October 13, 2009, the contents of which are incorporated herein by reference.
- the plasma processing apparatus As the plasma processing apparatus, a plasma CVD apparatus for forming a thin film on a substrate, an etching apparatus for plasma etching a wafer when manufacturing a semiconductor integrated circuit, and the like are widely used.
- the plasma processing apparatus includes a vacuum vessel and an electrode plate disposed in the vacuum vessel.
- the electrode plate is made of silicon or silicon carbide (SiC), and is provided with a large number of air holes penetrating in the thickness direction.
- the wafer can be etched by generating plasma between the wafer and the electrode plate while supplying the etching gas as the gas.
- a fine pattern is formed on a wafer with high accuracy by using a plasma etching processing apparatus.
- Such an electrode plate for a plasma processing apparatus is, for example, as described in Patent Document 1, a silicon plate having a thickness of 4 mm to 5 mm and a through hole (vent hole) having a diameter of 0.1 mm to 0.5 mm. Is manufactured by drilling.
- the air holes By forming the air holes with high accuracy, the gas can be supplied uniformly in the plasma processing apparatus including the electrode plate.
- the smoothness and processing accuracy of the inner surface of the through hole (vent hole) formed in the electrode plate affect the processing accuracy (wafer processing accuracy) of the plasma processing apparatus.
- a plasma etching processing apparatus it affects the processing accuracy of a pattern formed on a wafer.
- Patent Document 1 it is proposed that surface processing is performed on the inner surface of a through hole (vent hole) by a lap machine or a polish machine to form a vent hole having a small surface roughness on the inner surface.
- Patent Document 2 discloses a process of forming a pilot hole at a relatively high speed by electric discharge machining or laser machining, and then machining the inner surface of the pilot hole at a relatively low speed using a diamond drill or the like. There has been proposed a method of forming a through hole including a step of removing a processing damage layer. With this through-hole forming method, it is possible to efficiently form fine holes with excellent accuracy of the processed surface.
- a ventilation hole with high finishing accuracy has a step of forming a pilot hole and a step of irradiating the inner surface of the pilot hole with a picosecond laser beam having a large energy density to remove a heat-affected zone when the pilot hole is formed.
- the formation method of this is proposed.
- vent holes having the same opening diameter can be formed on the front and back surfaces of the electrode plate.
- two processes, a process of forming a pilot hole and a process of processing the inner surface of the pilot hole, are required. For this reason, the processing method with higher productivity is calculated
- JP-A-9-289195 Japanese Patent Laid-Open No. 11-92972 JP 2008-55478 A
- the present invention has been made in view of such circumstances, and an object of the present invention is to provide a processing method for forming a gas ejection vent with good shape accuracy on an electrode plate for a plasma processing apparatus with high productivity.
- a method for forming a vent in an electrode plate the surface roughening step of roughening a surface of an electrode plate for a plasma processing apparatus so that a center line average roughness Ra is 0.2 ⁇ m to 30 ⁇ m.
- Irradiating the roughened surface of the electrode plate with a laser beam having a wavelength of 200 nm to 600 nm to form a vent hole penetrating in the thickness direction on the electrode plate In the air hole forming step, a circular irradiation area is formed by turning the focal spot of the laser beam along the surface direction of the electrode plate, and the irradiation area is moved circularly in the surface direction of the electrode plate. The focal spot of the laser beam is moved in the thickness direction of the electrode plate.
- the center line average roughness Ra is a value calculated as follows.
- the measured roughness curve is folded back from the center line, and the total area of the area surrounded by the roughness curve and the center line is obtained.
- a value (unit: ⁇ m) obtained by dividing the total sum of the areas by the measurement length is the center line average roughness Ra.
- the roughness curve is measured with a contact-type measuring device.
- the irradiation area having a larger area than the focal spot of the laser beam is formed.
- the electrode plate is perforated spirally by moving the irradiation area spirally with respect to the electrode plate (moving forward in the thickness direction).
- a vent hole having a larger cross-sectional area than the focal spot can be formed. Therefore, the step of forming the pilot hole with a drill or the like is unnecessary, and the air hole can be formed by one step of irradiating the laser beam.
- the laser beam can be efficiently absorbed by the electrode plate in the air hole forming step.
- An example of the material of the electrode plate is silicon carbide. It is difficult to process the electrode plate made of silicon carbide. For this reason, conventionally, with respect to an electrode plate made of silicon carbide, it has been difficult to form an air hole or to perform an etching process for removing a work-affected layer in a later step.
- a laser beam having a short wavelength is used, so that a vent hole can be formed even for an electrode plate made of silicon carbide. Further, precise deep hole machining can be easily performed, and a vent hole having a smooth inner wall surface and a small work-affected layer can be formed. For this reason, the etching process for removing a work-affected layer can be omitted. Therefore, the method for forming an air hole in an electrode plate according to an aspect of the present invention is particularly effective for an electrode plate made of silicon carbide that is difficult to etch to remove the air hole formation or the work-affected layer. .
- an air hole having a smooth inner wall surface and a small work-affected layer can be formed with high processing accuracy. Furthermore, since such a ventilation hole can be formed in a short process without forming a pilot hole, high productivity can be achieved.
- a method for forming a vent hole in an electrode plate according to an aspect of the present invention is a method of forming a vent hole 11 penetrating in the thickness direction in an electrode plate 10 for a plasma processing apparatus as shown in FIG.
- the surface 10a of the electrode plate 10 is roughened so that the center line average roughness Ra is 0.2 ⁇ m to 30 ⁇ m (FIG. 2), and the surface of the electrode plate 10 is roughened.
- 10a has a vent hole forming step (FIGS. 1 and 3) in which the vent hole 11 is formed by irradiating the laser beam 20 having a wavelength of 200 nm to 600 nm to 10a.
- the electrode plate 10 examples include those made of silicon or silicon carbide (SiC).
- SiC silicon carbide
- the vent hole 11 having a diameter of 0.3 mm is several mm to 10 mm.
- the ventilation holes 11 can be formed so as to penetrate in the thickness direction so that several hundred to 1,000 pieces are arranged in the vertical and horizontal directions at a pitch (for example, 8 mm). Below, each process is demonstrated in detail.
- the surface 10a of the electrode plate 10 is a mirror surface, the laser light 20 is reflected and hardly absorbed by the surface 10a, and processing with the laser light 20 is difficult. For this reason, the surface 10a of the electrode plate 10 is first roughened by a surface grinding machine or a lapping machine. Specifically, as shown in FIG. 2, the surface 10a of the electrode plate 10 is roughened so that the center line average roughness Ra is 0.2 ⁇ m to 30 ⁇ m.
- the processing method in the roughening step include grinding with a grindstone, processing by lapping, processing by sand paper, and the like.
- the processing conditions such as the type and size of the abrasive grains and the processing time are not particularly limited, and are appropriately adjusted so as to obtain the target centerline average roughness Ra.
- the center line average roughness Ra By setting the center line average roughness Ra to 0.2 ⁇ m to 30 ⁇ m, the reflection of the laser beam 20 can be suppressed, the absorption efficiency of the laser beam 20 can be increased, and the workability by the laser can be improved.
- the center line average roughness Ra is less than 0.2 ⁇ m, the processability by the laser cannot be sufficiently improved.
- the center line average roughness Ra exceeds 30 ⁇ m, the roughening treatment takes a long time and the productivity is poor. Further, the strength of the electrode plate 10 may be reduced.
- FIG. 1 is a plan view showing the focal spot 21 and the irradiation area 22 of the laser light 20 and the air holes 11 to be formed.
- FIG. 4 is a schematic diagram showing a state in which the irradiation area 22 is formed by the laser light 20. As shown in FIG. 4, a circular irradiation area 22 is formed by turning the focal spot 21 of the laser light 20 along the surface direction of the electrode plate 10.
- the irradiation area 22 is circularly moved in the surface direction (xy direction) of the electrode plate 10 as shown in FIG. 3, and the focal spot 21 of the laser light 20 is moved to the electrode plate 10. Move in the thickness direction (z direction).
- the portion of the irradiation area 22 that is irradiated with the laser beam 20 is heated by the heat of the laser beam 20 to be evaporated and removed.
- the vapor on the electrode plate 10 is quickly removed from the vicinity of the irradiation area 22 by a suction device or the like (not shown). As a result, the air holes 11 are formed in the electrode plate 10.
- the laser beam 20 is a short wavelength pulse laser with a wavelength of 200 nm to 600 nm and has a high energy density. For this reason, the heat affected zone formed in the workpiece is small, and precise machining is possible. Therefore, by using this laser beam 20, the formation of the heat affected zone can be suppressed, and the vent hole 11 having a smooth inner wall surface and a small work-affected layer (heat affected zone) can be formed with high machining accuracy. . For this reason, the process of forming a pilot hole and the process of processing an inner surface are not required unlike the past, and the air vent 11 can be formed by one process, and high productivity can be achieved.
- the focal spot 21 of the laser beam 20 can be rotated by an optical system (not shown) using a wedge prism or the like. Thereby, as shown in FIG. 4, the locus of the laser beam 20 becomes a parallel beam having a diameter of 200 ⁇ m, for example. For this reason, the ventilation hole 11 without a taper can be formed.
- the irradiation area 22 By rotating the irradiation area 22 by the optical system, the irradiation area 22 can be moved circularly with respect to the electrode plate 10.
- the irradiation area 22 can be moved circularly relative to the electrode plate 10 by swinging a table (not shown) to which the electrode plate 10 is fixed in the xy direction.
- the focal spot 21 of the laser beam 20 is moved to the electrode plate 10. Relative movement in the thickness direction. Also, the focal spot 21 of the laser light 20 can be moved relative to the thickness direction of the electrode plate 10 by moving the table to which the electrode plate 10 is fixed in the z direction. In this way, by moving the electrode plate 10 and the laser beam 20 relative to each other and advancing the irradiation area 22 of the laser beam 20 spirally in the thickness direction with respect to the electrode plate 10, Can be formed.
- the irradiation area 22 of the laser beam 20 that has become a parallel beam is advanced spirally in the thickness direction with respect to the electrode plate 10.
- the vent hole 11 (the precise vent hole 11 having a small difference in diameter between the entrance side and the exit side of the laser beam 22) can be formed on the front and back surfaces of the electrode plate 10. Furthermore, such a vent hole 11 can be formed in a short process without forming a pilot hole.
- the present invention is not limited to the configuration of the above-described embodiment, and various modifications can be made in the detailed configuration without departing from the spirit of the present invention.
- the material of the electrode plate 10 is not limited to silicon carbide, and single crystal silicon or the like can be used.
- the formation conditions according to the material and thickness of the electrode plate 10 and the diameter of the vent hole 11 to be formed a vent hole with good shape accuracy can be formed.
- an air hole having a smooth inner wall surface and a small work-affected layer can be formed with high processing accuracy.
- the processing accuracy of the pattern formed on the wafer by the plasma etching processing apparatus depends on the smoothness and processing accuracy of the inner surface of the air hole of the electrode plate mounted on the plasma etching processing apparatus. Therefore, the electrode plate in which the air holes are formed by the air hole forming method according to one embodiment of the present invention can greatly contribute to the improvement of the processing accuracy of the plasma processing apparatus.
- the method for forming an air hole in an electrode plate according to one embodiment of the present invention can be suitably applied to an electrode manufacturing process for a plasma processing apparatus.
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Abstract
Description
本願は、2009年10月13日に、日本に出願された特願2009-236694号に基づき優先権を主張し、その内容をここに援用する。
プラズマ処理装置を用いてウェーハを処理する際には、まず電極板とウェーハとが対向するように真空容器の中にウェーハを配置する。次いで、これら電極板とウェーハとの間に、電極板の通気孔を通じてガスを供給する。この状態を維持したまま、電極板に高周波電圧を印加することにより、ウェーハと電極板との間にプラズマを発生させる。
エッチング処理装置においては、前記ガスとして、エッチングガスを供給しながら、ウェーハと電極板との間にプラズマを発生させることによって、ウェーハをエッチングできる。近年では、プラズマエッチング処理装置を用いて、ウェーハ上に微細なパターンを高精度に形成することが行なわれている。
通気孔を高い精度で形成することにより、この電極板を具備するプラズマ処理装置において、ガスを均一に供給することが可能となる。このため、電極板に形成された貫通孔(通気孔)の内面の平滑度や加工精度は、プラズマ処理装置の処理精度(ウェーハの加工精度)に影響する。例えば、プラズマエッチング処理装置の場合、ウェーハに形成されるパターンの加工精度などに影響する。
特許文献1においては、ラップマシンやポリッシュマシンにより、貫通孔(通気孔)の内面に対して表面加工を行い、内面の表面粗さの小さい通気孔を形成することが提案されている。
したがって、ドリル等によって下穴を形成する工程が不要であり、レーザ光を照射する1工程により、通気孔を形成できる。また、予め電極板の表面を粗面化することにより、通気孔形成工程において、レーザ光を電極板に効率よく吸収させることができる。
本発明の一態様に係る電極板の通気孔形成方法は、図1に示すようにプラズマ処理装置用の電極板10に厚さ方向に貫通する通気孔11を形成する方法である。この方法は、電極板10の表面10aを粗面化して、中心線平均粗さRaを0.2μm~30μmとする粗面化工程(図2)と、電極板10の粗面化された表面10aに波長200nm~600nmのレーザ光20を照射して通気孔11を形成する通気孔形成工程(図1,3)とを有する。
以下に、各工程について詳細に説明する。
電極板10の表面10aが鏡面である場合、レーザ光20は表面10aで反射されて吸収されにくく、レーザ光20による加工が困難である。このため、まず平面研削盤またはラップマシン等により、電極板10の表面10aを粗面化する。詳細には、図2に示すように中心線平均粗さRaが0.2μm~30μmとなるように、電極板10の表面10aを粗面化する。
粗面化工程における加工方法としては、砥石での研削加工、ラッピングによる加工、サンドペーパによる加工などが挙げられる。
砥粒の種類や大きさ、加工時間などの加工条件は、特に限定されず、目的とする中心線平均粗さRaが得られるように適宜調整される。
中心線平均粗さRaを0.2μm~30μmとすることによって、レーザ光20の反射を抑えることができ、レーザ光20の吸収効率を高め、レーザによる加工性を向上させることができる。
中心線平均粗さRaが0.2μm未満では、上記したレーザによる加工性が十分に向上できない。中心線平均粗さRaが30μm超では、粗面化処理に長時間を要し、生産性に劣る。また、電極板10の強度低下を招く恐れがある。
次に、図1に示すように、粗面化された電極板10の表面10aにレーザ光20を照射して、電極板10に、厚さ方向に貫通する通気孔11を形成する。
図3は、レーザ光20の焦点スポット21及び照射エリア22と、形成される通気孔11とを示す平面図である。図4は、レーザ光20によって照射エリア22を形成している状態を示す模式図である。図4に示されたように、レーザ光20の焦点スポット21を電極板10の面方向に沿って旋回させることにより円形の照射エリア22を形成する。そして、照射エリア22を形成しながら、図3に示されたように照射エリア22を電極板10の面方向(xy方向)に円運動させると共に、レーザ光20の焦点スポット21を電極板10の厚さ方向(z方向)に移動させる。電極板10において、照射エリア22のレーザ光20が当たっている部位は、レーザ光20の熱により加熱されて蒸発し、除去される。電極板10の蒸気は、吸引装置等(図示せず)により速やかに照射エリア22の近傍から取り除かれる。以上により、電極板10に通気孔11が形成される。
照射エリア22を光学系により旋回させることによって、照射エリア22を電極板10に対して円運動させることができる。また、電極板10が固定されたテーブル(図示せず)をxy方向に揺動させることにより、照射エリア22を電極板10に対して相対的に円運動させることができる。
電極板10に対してレーザ光20の照射ユニット(図示せず)をz方向(電極板10の表面10aに対して垂直方向)に進退させることにより、レーザ光20の焦点スポット21を電極板10の厚さ方向に相対移動させることができる。また、電極板10が固定されたテーブルをz方向に進退させることによっても、レーザ光20の焦点スポット21を電極板10の厚さ方向に相対移動させることができる。
このように、電極板10とレーザ光20とを相対的に移動させて、レーザ光20の照射エリア22を電極板10に対して厚さ方向に螺旋状に前進させることにより、通気孔11を形成できる。
更に、前記した内壁面が平滑でありかつ加工変質層が小さい通気孔を、下穴を形成せずに短工程で形成できるため、高い生産性を達成できる。
従って、本発明の一態様に係る電極板の通気孔形成方法は、プラズマ処理装置用の電極の製造工程に好適に適用できる。
10a 表面
11 通気孔
20 レーザ光
21 焦点スポット
22 照射エリア
Claims (1)
- プラズマ処理装置用の電極板の表面を粗面化して、中心線平均粗さRaを0.2μm~30μmとする粗面化工程と、
前記電極板の粗面化された前記表面に波長200nm~600nmのレーザ光を照射して、前記電極板に、厚さ方向に貫通する通気孔を形成する通気孔形成工程とを有し、
前記通気孔形成工程において、前記レーザ光の焦点スポットを前記電極板の面方向に沿って旋回させることにより円形の照射エリアを形成し、前記照射エリアを前記電極板の面方向に円運動させながら、前記レーザ光の焦点スポットを前記電極板の厚さ方向に移動させることを特徴とする電極板の通気孔形成方法。
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KR1020127004784A KR20120086688A (ko) | 2009-10-13 | 2010-10-06 | 전극판의 통기공 형성 방법 |
CN201080033653XA CN102473632A (zh) | 2009-10-13 | 2010-10-06 | 电极板的通气孔形成方法 |
US13/393,582 US8709328B2 (en) | 2009-10-13 | 2010-10-06 | Method for forming ventilation holes in an electrode plate |
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JP2009236694 | 2009-10-13 | ||
JP2009-236694 | 2009-10-13 |
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JP2013146780A (ja) * | 2012-01-23 | 2013-08-01 | Mitsuboshi Diamond Industrial Co Ltd | 脆性材料基板のレーザ加工方法 |
WO2019093194A1 (ja) * | 2017-11-07 | 2019-05-16 | 住友電工焼結合金株式会社 | 鉄系焼結体とそのレーザーマーキング方法並びに製造方法 |
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- 2010-10-06 WO PCT/JP2010/067528 patent/WO2011046052A1/ja active Application Filing
- 2010-10-06 US US13/393,582 patent/US8709328B2/en active Active
- 2010-10-08 TW TW099134407A patent/TWI492808B/zh active
- 2010-10-13 JP JP2010230706A patent/JP2011103456A/ja active Pending
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Also Published As
Publication number | Publication date |
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CN102473632A (zh) | 2012-05-23 |
TWI492808B (zh) | 2015-07-21 |
KR20120086688A (ko) | 2012-08-03 |
US8709328B2 (en) | 2014-04-29 |
US20120187605A1 (en) | 2012-07-26 |
JP2011103456A (ja) | 2011-05-26 |
TW201130592A (en) | 2011-09-16 |
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