WO2022264922A1 - プラズマ処理装置用部材 - Google Patents
プラズマ処理装置用部材 Download PDFInfo
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- WO2022264922A1 WO2022264922A1 PCT/JP2022/023350 JP2022023350W WO2022264922A1 WO 2022264922 A1 WO2022264922 A1 WO 2022264922A1 JP 2022023350 W JP2022023350 W JP 2022023350W WO 2022264922 A1 WO2022264922 A1 WO 2022264922A1
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- Prior art keywords
- conductive layer
- heating element
- substrate
- plasma processing
- processing apparatus
- Prior art date
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- 238000010438 heat treatment Methods 0.000 claims abstract description 96
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- 229910052759 nickel Inorganic materials 0.000 description 3
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- 230000000149 penetrating effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
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Images
Classifications
-
- 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
- H01J37/32623—Mechanical discharge control means
- H01J37/32651—Shields, e.g. dark space shields, Faraday shields
-
- 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
- H01J37/3244—Gas supply means
- H01J37/32449—Gas control, e.g. control of the gas flow
-
- 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
- H01J37/32568—Relative arrangement or disposition of electrodes; moving means
-
- 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
-
- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
-
- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
Definitions
- the present disclosure relates to members for plasma processing apparatuses.
- a plasma processing apparatus has a substrate support that supports a substrate, and a showerhead that is positioned above the substrate support and supplies a process gas.
- Such a plasma processing apparatus processes a substrate supported by a substrate support by generating plasma of a process gas in a processing space sandwiched between the substrate support and the showerhead.
- a member for a plasma processing apparatus has a substrate, a plasma electrode, a heating element, and a conductive layer.
- the substrate is made of ceramics and has a surface facing the object to be processed.
- a plasma electrode is located inside the substrate.
- the heating element and conductive layer are located inside the substrate further from the facing surface than the plasma electrode.
- the heating element and the conductive layer do not overlap in a plan view seen in a direction orthogonal to the opposing surface, and are positioned at different heights in a side view seen in a direction parallel to the opposing surface.
- FIG. 1 is a schematic diagram showing the configuration of a plasma processing apparatus according to the first embodiment.
- FIG. 2 is a schematic cross-sectional view showing the configuration of the substrate supporting portion according to the first embodiment.
- FIG. 3 is a perspective plan view of the substrate supporting portion according to the first embodiment, viewed from above.
- FIG. 4 is a schematic cross-sectional view showing another configuration example of the substrate supporting portion according to the first embodiment.
- FIG. 5 is a schematic cross-sectional view showing another configuration example of the substrate supporting portion according to the first embodiment.
- FIG. 6 is a schematic cross-sectional view showing another configuration example of the substrate supporting portion according to the first embodiment.
- FIG. 7 is a schematic cross-sectional view showing another configuration example of the substrate supporting portion according to the first embodiment.
- FIG. 1 is a schematic diagram showing the configuration of a plasma processing apparatus according to the first embodiment.
- FIG. 2 is a schematic cross-sectional view showing the configuration of the substrate supporting portion according to the first embodiment.
- FIG. 3 is
- FIG. 8 is a schematic cross-sectional view showing the configuration of the showerhead according to the second embodiment.
- FIG. 9 is a schematic cross-sectional view showing another configuration example of the showerhead according to the second embodiment.
- FIG. 10 is a schematic cross-sectional view showing another configuration example of the showerhead according to the second embodiment.
- Patent Document 1 discloses a technique of using a heater line connecting a heater provided inside an electrostatic chuck and a heater power source as a high-frequency leakage line.
- the technique described in Patent Document 1 is insufficient as a countermeasure against leakage current. Therefore, it is expected to provide a plasma processing apparatus member that can suppress the generation of leakage current.
- FIG. 1 is a schematic diagram showing the configuration of a plasma processing apparatus according to the first embodiment.
- the plasma processing apparatus 1 according to the first embodiment has a chamber 10, a substrate supporter 20, and a showerhead 30.
- the plasma processing apparatus 1 according to the first embodiment has a chamber 10, a substrate supporter 20, and a showerhead 30.
- FIG. 1 is a schematic diagram showing the configuration of a plasma processing apparatus according to the first embodiment.
- the plasma processing apparatus 1 according to the first embodiment has a chamber 10, a substrate supporter 20, and a showerhead 30.
- FIG. 1 is a schematic diagram showing the configuration of a plasma processing apparatus according to the first embodiment.
- the plasma processing apparatus 1 according to the first embodiment has a chamber 10, a substrate supporter 20, and a showerhead 30.
- plasma processing apparatus 1 is a type of plasma processing apparatus in which high frequency (RF) power is applied only to the substrate supporting portion 20 of the substrate supporting portion 20 and the shower head 30 will be described.
- the configuration of the device 1 is not limited to this example.
- plasma processing apparatus 1 may be a type of plasma processing apparatus that applies high-frequency power to both substrate support 20 and showerhead 30 .
- the plasma processing apparatus 1 is a type of plasma processing apparatus that uses high-frequency power to generate plasma will be described. does not require
- the chamber 10 is a container that houses the substrate supporter 20 and the showerhead 30 .
- An exhaust device 12 is connected to the chamber 10 via an exhaust pipe 11 .
- the evacuation device 12 has a vacuum pump such as a turbomolecular pump, for example, and can decompress the inside of the chamber 10 to a desired degree of vacuum.
- a side wall of the chamber 10 may be provided with a loading/unloading port for the substrate W such as a semiconductor wafer. In this case, the loading/unloading port can be opened and closed by a gate valve.
- the substrate support part 20 is a member that supports the substrate W, and is horizontally supported from below by a hollow shaft 40, for example.
- the substrate W is supported on the upper surface of the substrate support portion 20 .
- a plasma electrode, a heating element, and a conductive layer are located inside the substrate support portion 20 .
- the plasma electrode is connected to a high frequency power source 43 via a power supply member 41 and a matching device 42 .
- the matching device 42 is a circuit for matching the output impedance of the high frequency power supply 43 and the input impedance on the load side, that is, on the plasma electrode side. High-frequency power generated by the high-frequency power supply 43 is supplied to the plasma electrode via the matching box 42 and the power supply member 41 .
- the heating element is connected to a heater power source 45 via a power supply member 44 .
- a heater power source 45 By supplying electric power from the heater power source 45 to the heating element, the substrate W supported by the substrate support section 20 can be heated.
- the conductive layer functions as a shield member that shields the electric field generated by the plasma electrode.
- Such conductive layers are grounded through conductive members 46 . Thereby, the electric field generated by the plasma electrode can be shielded more reliably. Note that the conductive layer does not necessarily need to be grounded.
- the power supply members 41 and 44 and the conductive member 46 are inserted through the hollow portion of the shaft 40 .
- the shower head 30 is horizontally supported from above by a shaft 50 above the substrate support portion 20 .
- the bottom surface of the showerhead 30 faces the top surface of the substrate support 20 .
- a process gas supply source 54 is connected to the shower head 30 via a gas supply pipe 51 , an on-off valve 52 and a flow rate regulator 53 .
- a process gas supplied from the process gas supply source 54 is supplied into the chamber 10 from a plurality of ejection holes opening on the lower surface of the shower head 30 .
- a plasma electrode is located inside the shower head 30 .
- the plasma electrode is grounded via a conductive member 55 .
- the shafts 40, 50 have, for example, a tubular shape with both ends open. Shafts 40 and 50 are adhered to substrate support 20 and showerhead 30 by, for example, an adhesive. Thereby, the substrate supporting part 20 and the shower head 30 are joined. Alternatively, shafts 40 and 50 may be joined to substrate support 20 and showerhead 30 by solid phase joining.
- the shape of the shafts 40, 50 is arbitrary. As one aspect, the shape of the shafts 40, 50 is cylindrical. As another aspect, the shape of the shafts 40 and 50 may be, for example, a square tube shape.
- the material of shafts 40, 50 is arbitrary.
- the material of shafts 40 and 50 may be insulating ceramics.
- the material of shafts 40, 50 may be, for example, an electrically conductive material, such as metal.
- the ceramics constituting the shafts 40 and 50 are, for example, ceramics containing aluminum nitride (AlN), aluminum oxide (Al 2 O 3 , alumina), silicon carbide (SiC), silicon nitride (Si 3 N 4 ), etc. as main components. It may be a body.
- FIG. 2 is a schematic cross-sectional view showing the configuration of the substrate supporting portion 20 according to the first embodiment.
- FIG. 3 is a perspective plan view of the substrate supporting portion 20 according to the first embodiment as viewed from above. Note that the cross section shown in FIG. 2 corresponds to, for example, the cross section taken along line II-II shown in FIG.
- the substrate support section 20 has a substrate 21, a plasma electrode 22, a heating element 23, and a conductive layer 24.
- Substrate 21 is made of ceramics, for example, and has insulating properties.
- the ceramics constituting the base 21 is a sintered body whose main component is, for example, aluminum nitride (AlN), aluminum oxide ( Al2O3 , alumina), silicon carbide (SiC), silicon nitride ( Si3N4 ), or the like.
- the main component is, for example, a material that accounts for 50% by mass or more or 80% by mass or more of the material.
- the substrate 21 may contain a compound of yttrium (Y). Examples of Y compounds include YAG (Y 3 Al 5 O 12 ) and Y 2 O 3 .
- a substrate W (see FIG. 1) is placed on the upper surface 21 a of the base 21 .
- the upper surface 21a of the substrate 21 corresponds to the surface facing the substrate W.
- the substrate W is an example of an object to be processed.
- the shape of the substrate 21 is arbitrary.
- the shape of the base 21 is circular in plan view, but it is not limited to this, and may be elliptical, rectangular, trapezoidal, or the like in plan view.
- the upper surface 21a of the base 21 may be a uniform flat surface, or may have grooves, steps, and the like.
- the plasma electrode 22 , heating element 23 and conductive layer 24 are located inside the base 21 .
- the plasma electrode 22 is an electrode for plasma generation, and extends in layers along the upper surface 21a of the substrate 21 .
- Plasma electrode 22 has, for example, a disc shape in plan view.
- the plasma electrode 22 is made of, for example, metals such as nickel (Ni), tungsten (W), titanium (Ti), molybdenum (Mo) and platinum (Pt), or alloys containing at least one of the above metals.
- the heating element 23 generates heat by Joule heat generated by electric power supplied from the heater power supply 45 via the power supply member 44 .
- the heating element 23 extends in layers along the upper surface 21 a of the base 21 . Specifically, the heating element 23 is stretched around in a predetermined pattern such as a meandering shape (see FIG. 3) or a spiral shape so as to have a circular outer shape in a plan view.
- the heating element 23 is made of, for example, metals such as nickel (Ni), tungsten (W), molybdenum (Mo) and platinum (Pt), or alloys containing at least one of the above metals.
- the conductive layer 24 functions as an electric field shield that shields the electric field generated by the plasma electrode 22 .
- the conductive layer 24 extends in layers along the upper surface 21 a of the base 21 . Specifically, the conductive layer 24 is stretched so as to have a circular outer shape in plan view while drawing a predetermined pattern.
- the conductive layer 24 is made of, for example, metals such as nickel (Ni), tungsten (W), molybdenum (Mo) and platinum (Pt), or alloys containing at least one of the above metals.
- the plasma electrode 22, the heating element 23, and the conductive layer 24 are, for example, arranged in the depth direction with the upper surface 21a of the substrate 21 as a reference, in other words, the direction from the upper surface 21a to the lower surface 21b of the substrate 21. , the plasma electrode 22, the heating element 23 and the conductive layer 24 are located in this order. That is, the heating element 23 and the conductive layer 24 are positioned at different heights when viewed from the side in a direction parallel to the upper surface 21a of the substrate 21 .
- the pattern shape (second pattern shape) of the conductive layer 24 is, for example, the pattern shape of the heating element 23 ( (first pattern shape).
- the metal wiring that constitutes the heating element 23 extends while drawing the first pattern shape.
- the first pattern shape is, for example, a meandering shape.
- the metal wirings forming the conductive layer 24 are located in the gaps between the metal wirings forming the heating element 23 .
- the metal wirings forming the conductive layer 24 extend along the gaps between the metal wirings forming the heating element 23 to form a second pattern shape.
- the first pattern shape is formed by a so-called one-stroke drawing without branches, whereas the second pattern shape has a plurality of branches.
- the heating element 23 and the conductive layer 24 do not overlap in plan view.
- the conductive layer 24 according to the first embodiment is positioned in a region other than the region where the heating element 23 is positioned in plan view.
- the heating element 23 and the conductive layer 24 are positioned at different heights in a side view.
- the distance between the heating element 23 and the conductive layer 24 is increased compared to the case where the heating element 23 and the conductive layer 24 overlap in a plan view.
- Leakage current is less likely to occur between Therefore, according to the board
- the electrical characteristics of the substrate supporting portion 20 are further stabilized. Therefore, according to the substrate supporting portion 20 according to the first embodiment, the reliability of the substrate supporting portion 20 can be enhanced.
- the substrate support section 20 can shield the electric field generated by the plasma electrode 22 with the heating element 23 and the conductive layer 24 .
- the substrate supporting portion 20 can shield the electric field generated by the plasma electrode 22 with the heating element 23 and shield the electric field leaking from the gap between the metal wirings forming the heating element 23 with the conductive layer 24 .
- the conductive layer 24 is formed in a predetermined pattern shape so as not to overlap the heating element 23 in plan view. For this reason, according to the substrate supporting portion 20 according to the first embodiment, the material cost of the conductive layer 24 can be reduced compared to the case where the conductive layer 24 is formed in a uniform flat plate shape, for example, and the function as an electric field shield can be achieved. can be maintained.
- the conductive layer 24 may have an outermost outer peripheral portion 24a in a direction parallel to the upper surface 21a of the base 21 (surface direction of the base 21).
- the conductive layer 24 may have a plurality of curved portions arranged concentrically.
- the curved portion may be arcuate or circumferential.
- the outer peripheral portion 24a may be the curved portion positioned furthest outward in the surface direction of the base 21 among these curved portions.
- the heat generating element 23 may have an outer peripheral portion 23a located at the outermost position in a direction parallel to the upper surface 21a of the base 21, that is, in the surface direction of the base 21. As shown in FIG.
- the heating element 23 may have a plurality of arcuate curved portions arranged concentrically.
- the outer peripheral portion 23a may be the curved portion positioned furthest outward in the surface direction of the base 21 among these curved portions.
- the outer peripheral portion 24a of the conductive layer 24 may be positioned further outward than the outer peripheral portion 23a of the heating element 23. In other words, the outer peripheral portion 24a of the conductive layer 24 may be positioned closer to the side surface 21c of the base 21 than the outer peripheral portion 23a of the heating element 23 is.
- the electric charge accumulated in the outer peripheral portion of the base 21 is reduced. It is highly effective in eliminating Therefore, the electrical characteristics of the substrate supporting portion 20 can be further stabilized, and the reliability of the substrate supporting portion 20 can be enhanced.
- the outer peripheral portion 24a of the conductive layer 24 may be positioned further outward than the outer peripheral portion of the plasma electrode 22.
- the outer peripheral portion 24 a of the conductive layer 24 may be positioned closer to the side surface 21 c of the substrate 21 than the outer peripheral portion of the plasma electrode 22 .
- the electric field radially spreading from the plasma electrode 22 can be appropriately shielded.
- the heating element 23 and the conductive layer 24 are positioned in the order of the heating element 23 and the conductive layer 24 in the depth direction with the upper surface 21a of the base 21 as a reference. That is, the heating element 23 is positioned closer to the upper surface 21 a of the base 21 than the conductive layer 24 is. For this reason, compared to the case where the heating element 23 and the conductive layer 24 are positioned in the order of the conductive layer 24 and the heating element 23 in the depth direction of the substrate 21, the substrate mounted on the upper surface 21a of the substrate 21 is more stable. W can be heated more efficiently.
- the substrate supporting portion 20 is formed by laminating a plurality of sheets. Specifically, a ceramic green sheet that forms the substrate 21, a metal sheet that forms the plasma electrode 22, a metal sheet that forms the heating element 23, and a metal sheet that forms the conductive layer 24 are prepared. Then, the prepared sheets are laminated. The ceramic green sheets located in the same layer as the metal sheets of the plasma electrode 22, the heating element 23 and the conductive layer 24 are die-cut according to the shapes of the metal sheets, and the metal sheets are placed in the die-cut portions. be located.
- the laminate of ceramic green sheets and metal sheets is degreased and fired.
- the firing temperature is, for example, 1100° C. or higher and 1850° C. or lower.
- holes for inserting connection terminals to the power supply members 41 and 44 and the conductive member 46 are formed in the fired laminate by, for example, drilling.
- the laminated body is joined through the joining layer.
- the conductive material is sintered by heat-treating the laminate to which the terminals are attached in a vacuum.
- the treatment temperature at this time is, for example, 500° C. or higher and 800° C. or lower.
- the substrate supporting portion 20 is obtained.
- the plasma electrode 22, the heating element 23, and the conductive layer 24 are formed of metal sheets here, metal paste, wire, or the like, for example, may be used instead of the metal sheets.
- FIG. 4 to 7 are schematic cross-sectional views showing other configuration examples of the substrate supporting portion 20 according to the first embodiment.
- the conductive layer 24 may have a central portion 24b located at the center in a direction parallel to the upper surface 21a of the base 21, that is, in the surface direction of the base 21.
- the conductive layer 24 may have a plurality of concentric curved portions (see FIG. 3).
- the center portion 24b is a curved portion located at the center in the surface direction of the base 21 among these curved portions, or a portion located closer to the center of the base 21 than the curved portion located at the center.
- the conductive layer 24 may be located closer to the upper surface 21a of the base 21 than the central portion 24b in the thickness direction of the base 21.
- the electric field radially spreading from the plasma electrode 22 can be shielded more appropriately.
- the distance between the heating element 23 and the conductive layer 24 increases in the central portion 24b of the conductive layer 24, the occurrence of leakage current in the central portion 24b of the conductive layer 24 can be suppressed.
- the heating element 23 may have a central portion 23b located at the most center in the direction parallel to the upper surface 21a of the base 21, that is, in the surface direction of the base 21.
- the heating element 23 may have a plurality of curved portions arranged concentrically (see FIG. 3).
- the center portion 23b is a curved portion located at the center in the surface direction of the base 21 among these curved portions, or a portion located closer to the center of the base 21 than the curved portion located at the center.
- the heating element 23 may be positioned closer to the upper surface 21a of the base body 21 than the central part 23b in the thickness direction of the base body 21 .
- the distance between the heating element 23 and the conductive layer 24 is large at the central portion 23b of the heating element 23, so that the occurrence of leakage current at the outer peripheral portion 23a of the heating element 23 can be suppressed.
- both the heating element 23 and the conductive layer 24 may be warped. That is, the heating element 23 and the conductive layer 24 may be positioned closer to the upper surface 21a of the base 21 than the central portions 23b and 24b in the thickness direction of the base 21 .
- the heating element 23 and the conductive layer 24 are similarly warped, it is possible to prevent the distance between the heating element 23 and the conductive layer 24 from being partially reduced. Therefore, the leakage current between the heating element 23 and the conductive layer 24 can be suitably suppressed while appropriately shielding the electric field radially spreading from the plasma electrode 22 .
- the central portions 23b and 24b are positioned closer to the upper surface 21a of the substrate 21 than the outer peripheral portions 23a and 24a in the thickness direction of the substrate 21. good too.
- the directions of warping of the heating element 23 and the conductive layer 24 are not limited to the examples shown in FIGS.
- the heating element 23 and the conductive layer 24 may warp in opposite directions. That is, the heating element 23 and the conductive layer 24 may be warped so that the central portions 23b and 24b are brought closer together, or may be warped so that the outer peripheral portions 23a and 24a are brought closer together.
- the metal sheet is laminated.
- the portion punched into the shape (hereinafter referred to as “punched portion”) is filled with ceramic powder or the like to partially increase the volume.
- a metal sheet is placed on the punched part.
- FIG. 8 is a schematic cross-sectional view showing the configuration of the showerhead 30 according to the second embodiment.
- the showerhead 30 has a substrate 31, a plasma electrode 32, a heating element 33, and a conductive layer .
- the structure and arrangement of the substrate 31, the plasma electrode 32, the heating element 33, and the conductive layer 34 are the same as those of the substrate 21, the plasma electrode 22, and the heating element 23 of the substrate support 20 according to the first embodiment. , the description is omitted here.
- the plasma electrode 32, the heating element 33, and the conductive layer 34 positioned inside the base 31 are positioned in this order, for example, in order of proximity to the lower surface 31b of the base 31 corresponding to the surface facing the substrate W.
- the heating element 33 and the conductive layer 34 may be warped like the heating element 23 and the conductive layer 24 shown in FIGS.
- the showerhead 30 has a plurality of ejection holes 35 and an introduction portion 36.
- a plurality of ejection holes 35 are opened in the lower surface 31b of the substrate 31 and eject process gas supplied from the process gas supply source 54 (see FIG. 1).
- the plurality of ejection holes 35 are through holes penetrating through the upper surface 31 a and the lower surface 31 b of the base 31 .
- the introduction part 36 is made of ceramics, for example, and is connected to the upper surface 31 a of the base 31 .
- the introduction part 36 has a recess on a surface facing the upper surface 31 a of the base 31 , and a flow path 37 is formed between the recess and the upper surface 31 a of the base 31 .
- the flow path 37 extends along the upper surface 31 a of the substrate 31 , is connected to the gas supply pipe 51 (see FIG. 1), and is connected to the plurality of ejection holes 35 .
- a process gas supplied from a process gas supply source 54 is introduced into the plurality of ejection holes 35 via the gas supply pipe 51 and the flow path 37 .
- a plurality of ejection holes 35 eject the introduced process gas into the chamber 10 .
- the shower head 30 does not necessarily need to have the introduction portion 36 .
- the multiple ejection holes 35 may be connected to multiple branch pipes branched from the gas supply pipe 51 .
- the showerhead 30 may have a channel 37 inside the base 31 .
- An example of such a case will be described with reference to FIGS. 9 and 10.
- FIG. 9 and 10 are schematic cross-sectional views showing other configuration examples of the shower head 30 according to the second embodiment.
- the flow path 37 may be located between the plasma electrode 32 and the heating element 33 and conductive layer 34 .
- the flow path 37 is positioned between the plasma electrode 32 and the heating element 33 . If the plasma electrode 32, the heating element 33, and the conductive layer 34 are positioned in the order of the plasma electrode 32, the conductive layer 34, and the heating element 33 in order of proximity to the lower surface 31b of the substrate 31, the flow path 37 will It may be located between 32 and conductive layer 34 .
- the flow path 37 may be positioned between the heating element 33 and the conductive layer 34 .
- the flow path 37 is interposed between the heat generating element 33 and the conductive layer 34 , so that it is possible to make it more difficult for leakage current to occur between the conductive layer 34 and the heat generating element 33 .
- a sintered body of the substrate 31 containing the plasma electrode 32, the heating element 33 and the conductive layer 34 is prepared, and then drilling or the like is performed on the sintered body.
- a plurality of ejection holes 35 penetrating the upper surface 31a and the lower surface 31b of the substrate 31 may be formed.
- this sintered body is prepared.
- a plurality of ejection holes 35 may be formed by connecting the lower surface 31b of the base 31 and the flow path 37 by drilling or the like.
- the flow path 37 may be located farther from the lower surface 31b of the base 31 than the heating element 33 and the conductive layer 34 are.
- the substrate support part 20 may also have a plurality of ejection holes. That is, the substrate supporting portion 20 may have a plurality of ejection holes that open to the upper surface 21 a of the base 21 .
- the substrate support 20 can supply, for example, a cooling gas or an intermediary gas that helps conduct heat from the substrate support 20 to the substrate W through the plurality of jet holes.
- FIG. 3 shows an example in which the substrate supporting part 20 has a so-called single-zone heater, but the substrate supporting part 20 has a multi-zone heater capable of individually controlling a plurality of regions on the upper surface 21a of the substrate 21. You may have In this case, the substrate supporting section 20 may have a plurality of heating elements 23 that are stretched over different regions of the upper surface 21 a of the base 21 .
- the plasma processing apparatus 1 is a capacitively coupled plasma processing apparatus. It may be any type of plasma processing device, such as a plasma processing device that excites a gas.
- the members for a plasma processing apparatus include substrates (substrates 21 and 31 as examples) and plasma electrodes (plasma electrodes as examples). 22, 32), heating elements (heating elements 23, 33 as an example), and conductive layers (conductive layers 24, 34 as an example).
- the substrate is made of ceramics and has a surface (eg, the upper surface 21a of the substrate 21 and the lower surface 31b of the substrate 31) facing the object to be processed (eg, the substrate W).
- a plasma electrode is located inside the substrate.
- the heating element and conductive layer are located inside the substrate further from the facing surface than the plasma electrode.
- the heating element and the conductive layer do not overlap in a plan view seen in a direction orthogonal to the opposing surface, and are positioned at different heights in a side view seen in a direction parallel to the opposing surface.
- the distance between the heating element and the conductive layer is greater than in the case where the heating element and the conductive layer overlap in plan view. It is possible to suppress the occurrence of leakage current between
- Plasma processing apparatus 10 Chamber 20; Substrate support 21; Substrate 22; Plasma electrode 23; power supply member 42; matching device 43; high frequency power supply 44; power supply member 45; heater power supply 46; flow regulator 54; process gas supply 55; conductive member
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Abstract
Description
まず、第1実施形態に係るプラズマ処理装置の構成について図1を参照して説明する。図1は、第1実施形態に係るプラズマ処理装置の構成を示す模式図である。図1に示すように、第1実施形態に係るプラズマ処理装置1は、チャンバ10と、基板支持部20と、シャワーヘッド30とを有する。
次に、第1実施形態に係る基板支持部20の製造方法の一例について説明する。一例として、基板支持部20は、複数のシートを積層することによって形成される。具体的には、基体21を構成するセラミックグリーンシートと、プラズマ電極22を構成する金属シートと、発熱体23を構成する金属シートと、導電層24を構成する金属シートとを用意する。そして、用意したシートを積層する。プラズマ電極22、発熱体23および導電層24の各金属シートと同じ層に位置するセラミックグリーンシートは、各金属シートの形状に合わせて型抜きされており、この型抜きされた部分に金属シートが位置される。
上述した第1実施形態では、発熱体23および導電層24が基体21の上面21aに対して平行である場合の例について説明したが、発熱体23および導電層24は、必ずしも基体21の上面21aに対して平行であることを要しない。たとえば、発熱体23または導電層24は、基体21の上面21aに対して反っていてもよい。
次に、本開示によるプラズマ処理装置用部材をシャワーヘッド30に適用した場合の例について説明する。図8は、第2実施形態に係るシャワーヘッド30の構成を示す模式的な断面図である。
シャワーヘッド30は、基体31の内部に流路37を有していてもよい。かかる場合の例について図9および図10を参照して説明する。図9および図10は、第2実施形態に係るシャワーヘッド30の他の構成例を示す模式的な断面図である。
上述した第2実施形態では、シャワーヘッド30が複数の噴出孔35を有する場合の例について説明した。これに限らず、基板支持部20も複数の噴出孔を有していてもよい。すなわち、基板支持部20は、基体21の上面21aに開口する複数の噴出孔を有していてもよい。この場合、基板支持部20は、たとえば、冷却ガス、または基板支持部20から基板Wへの熱伝導を助ける仲介ガスを複数の噴出孔から基板Wに供給することができる。
10;チャンバ
20;基板支持部
21;基体
22;プラズマ電極
23;発熱体
24;導電層
30;シャワーヘッド
31;基体
32;プラズマ電極
33;発熱体
34;導電層
35;噴出孔
36;導入部
37;流路
40;シャフト
41;給電部材
42;整合器
43;高周波電源
44;給電部材
45;ヒータ電源
46;導電部材
50;シャフト
51;ガス供給管
52;開閉バルブ
53;流量調整器
54;プロセスガス供給源
55;導電部材
Claims (13)
- セラミックスからなり、被処理体との対向面を有する基体と、
前記基体の内部に位置するプラズマ電極と、
前記基体の内部において、前記プラズマ電極よりも前記対向面から離れて位置する発熱体と、
前記基体の内部において、前記プラズマ電極よりも前記対向面から離れて位置する導電層と
を有し、
前記発熱体と前記導電層とは、前記対向面と直交する方向から見た平面視において重ならず、且つ、前記対向面と平行な方向から見た側面視において異なる高さに位置する、プラズマ処理装置用部材。 - 前記導電層は、接地されている、請求項1に記載のプラズマ処理装置用部材。
- 前記平面視において、前記導電層の外周部は、前記発熱体の外周部よりも外方に位置する、請求項1または2に記載のプラズマ処理装置用部材。
- 前記平面視において、前記導電層の外周部は、前記プラズマ電極の外周部よりも外方に位置する、請求項1~3のいずれか一つに記載のプラズマ処理装置用部材。
- 前記導電層は、前記発熱体よりも前記対向面から離れている、請求項1~4のいずれか一つに記載のプラズマ処理装置用部材。
- 前記対向面に開口し、気体を噴出する複数の噴出孔を有する、請求項1~5のいずれか一つに記載のプラズマ処理装置用部材。
- 前記基体の内部に位置し、前記複数の噴出孔に繋がる流路を有する、請求項6に記載のプラズマ処理装置用部材。
- 前記流路は、前記基体の厚み方向において、前記プラズマ電極と前記発熱体および前記導電層との間に位置する、請求項7に記載のプラズマ処理装置用部材。
- 前記流路は、前記基体の厚み方向において、前記発熱体と前記導電層との間に位置する、請求項7に記載のプラズマ処理装置用部材。
- 前記導電層は、外周部が中央部よりも前記対向面の近くに位置する、請求項1~9のいずれか一つに記載のプラズマ処理装置用部材。
- 前記発熱体は、外周部が中央部よりも前記対向面の近くに位置する、請求項1~9のいずれか一つに記載のプラズマ処理装置用部材。
- 前記発熱体および前記導電層は、外周部が中央部よりも前記対向面の近くに位置する、請求項1~9のいずれか一つに記載のプラズマ処理装置用部材。
- 前記発熱体は、第1のパターン形状を有し、
前記導電層は、第2のパターン形状を有し、
前記発熱体が有する前記第1のパターン形状の隙間に、前記導電層が有する前記第2のパターン形状が位置する、請求項1~12のいずれか一つに記載のプラズマ処理装置用部材。
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