PLASMA TREATMENT APPARATUS MEMBER

A plasma treatment apparatus member according to the present disclosure includes a base, a plasma electrode, a heating element, and a conductive layer. The base is made of a ceramic and has a facing surface facing an object to be processed. The plasma electrode is located inside the base. The heating element and the conductive layer are located farther from the facing surface than the plasma electrode are, inside the base. The heating element and the conductive layer do not overlap each other in plan view seen from a direction orthogonal to the facing surface, and are located at different heights in side view seen from a direction parallel to the facing surface.

TECHNICAL FIELD

The present disclosure relates to a plasma treatment apparatus member.

BACKGROUND OF INVENTION

There has been known a plasma treatment apparatus that processes a substrate such as a semiconductor wafer using plasma. The plasma treatment apparatus includes a substrate support that supports the substrate, and a shower head that is located above the substrate support and supplies a process gas. Such a plasma treatment apparatus generates plasma of a process gas in a treatment space between the substrate support and the shower head, thus processing the substrate supported by the substrate support.

CITATION LIST

Patent Literature

Patent Document 1: JP 2008-244145 A

SUMMARY

A plasma treatment apparatus member according to an aspect of the present disclosure includes a base, a plasma electrode, a heating element, and a conductive layer. The base is made of a ceramic and has a facing surface facing an object to be processed. The plasma electrode is located inside the base. The heating element and the conductive layer are located farther from the facing surface than the plasma electrode is, inside the base. The heating element and the conductive layer do not overlap each other in plan view seen from a direction orthogonal to the facing surface, and are located at different heights in side view seen from a direction parallel to the facing surface.

DESCRIPTION OF EMBODIMENTS

Modes (hereinafter referred to as “embodiments”) for implementing a plasma treatment apparatus member according to the present disclosure will be described in detail below with reference to the attached drawings. The embodiments are not intended to limit the plasma treatment apparatus member according to the present disclosure. Embodiments can be appropriately combined so as not to contradict each other in terms of processing content. In the following embodiments, the same portions are denoted by the same reference signs, and overlapping explanations are omitted.

In the embodiments described below, expressions such as “constant”, “orthogonal”, “perpendicular”, and “parallel” may be used, but these expressions do not need to be exactly “constant”, “orthogonal”, “perpendicular”, and “parallel”. In other words, it is assumed that the above expressions allow deviations in manufacturing accuracy, installation accuracy, or the like.

The drawings referenced below are schematic for illustrative purposes only. Therefore, the details may be omitted, and dimension ratios do not necessarily correspond to actual ones.

In each of the drawings referred to below, for ease of explanation, an X-axis direction, a Y-axis direction, and a Z-axis direction that are orthogonal to each other may be defined to illustrate a rectangular coordinate system in which the Z-axis positive direction is the vertically upward direction.

Patent Document 1 discloses a technique that uses a heater line connecting a heater provided inside an electrostatic chuck to a heater power supply, as a high-frequency leakage line. However, the technique described in Patent Document 1 is insufficient as a countermeasure against leakage current. Therefore, a plasma treatment apparatus member capable of suppressing the generation of leakage current is desired to be provided.

Hereinafter, an example in which a plasma treatment apparatus member according to the present disclosure is applied to a substrate support is described as a first embodiment. Subsequently, an example in which a plasma treatment apparatus member according to the present disclosure is applied to a shower head is described as a second embodiment.

First Embodiment

First, a configuration of a plasma treatment apparatus according to a first embodiment is described with reference toFIG.1.FIG.1is a schematic diagram illustrating a configuration of the plasma treatment apparatus according to the first embodiment. As illustrated inFIG.1, the plasma treatment apparatus1according to the first embodiment includes a chamber10, a substrate support20, and a shower head30.

Hereinafter, an example in which the plasma treatment apparatus1is a plasma treatment apparatus of a type in which a high-frequency (RF) power is applied only to the substrate support20, of the substrate support20and the shower head30, is described, but the configuration of the plasma treatment apparatus1is not limited to this example. For example, the plasma treatment apparatus I may be of a type in which high-frequency power is applied to both the substrate support20and the shower head30. In addition, the following example describes the plasma treatment apparatus1of a type that generates plasma using high-frequency power, but the power used for generation of plasma is not necessarily high-frequency power.

The chamber10is a container that accommodates the substrate support20and the shower head30. To the chamber10, an exhaust device12is connected via an exhaust pipe11. The exhaust device12includes, for example, a vacuum pump such as a turbo-molecular pump and thus can depressurize the inside of the chamber10to a desired degree of vacuum. Although not illustrated herein, a carry-in/out port of a substrate W such as a semiconductor wafer may be located in a sidewall of the chamber10. In this case, the carry-in/out port can be opened and closed by a gate valve.

The substrate support20is a member that supports the substrate W, and is supported horizontally from below by, for example, a hollow shaft40. The substrate W is supported on the upper surface of the substrate support20.

A plasma electrode, a heating element, and a conductive layer are located inside the substrate support20. The plasma electrode among them is connected to a high-frequency power supply43via a power supply member41and a matcher42. The matcher42is a circuit for matching the output impedance of the high-frequency power supply43with the input impedance of the load side, that is, the plasma electrode side. The high-frequency power generated by the high-frequency power supply43is supplied to the plasma electrode via the matcher42and the power supply member41.

The heating element is connected to a heater power supply45via a power supply member44. The power supplied to the heating element from the heater power supply45can heat the substrate W supported on the substrate support20.

The conductive layer functions as a shield member that blocks an electric field generated by the plasma electrode. Such a conductive layer is grounded via a conductive member46. This enables more reliable blocking of the electric field generated by the plasma electrode. The conductive layer need not necessarily be grounded.

The power supply members41,44and the conductive member46are inserted into a hollow portion of the shaft40.

The shower head30is horizontally supported from above by a shaft50above the substrate support20. A lower surface of the shower head30faces the upper surface of the substrate support20.

A process gas supply source54is connected to the shower head30via a gas supply pipe51, an opening/closing valve52, and a flow rate controller53. The process gas supplied from the process gas supply source54is supplied into the chamber10through a plurality of ejection holes opened in the lower surface of the shower head30.

A plasma electrode is located inside the shower head30. The plasma electrode is grounded via a conductive member55.

The shafts40,50have, for example, a tubular shape with both ends opened. The shafts40,50are respectively bonded to the substrate support20and the shower head30with, for example, an adhesive. Thus, the substrate support20and the shower head30are bonded. In another mode, the shafts40,50may be bonded respectively to the substrate support20and the shower head30by solid-phase bonding. The shafts40,50may have any shape. In one mode, the shafts40,50have a circular tube shape. In another mode, the shafts40,50may have, for example, a rectangular tube shape.

The shafts40,50are made of any material. In one mode, the shafts40,50may be made of an insulating ceramic material. In another mode, the shafts40,50may be made of, for example, a conductive material such as a metal. A ceramic of the shafts40,50may be a sintered body including, as a main component, aluminum nitride (AlN), aluminum oxide (Al2O3, alumina), silicon carbide (SiC), silicon nitride (Si3N4), or the like.

Next, a specific configuration of the substrate support20according to the first embodiment is described with reference toFIGS.2and3.FIG.2is a schematic cross-sectional view illustrating a configuration of the substrate support20according to the first embodiment.FIG.3is a perspective plan view of the substrate support20according to the first embodiment viewed from above. The cross-sectional view illustrated inFIG.2corresponds to a cross-sectional view taken along, for example, line II-II ofFIG.3.

As illustrated inFIG.2, the substrate support20includes a base21, a plasma electrode22, a heating element23, and a conductive layer24.

The base21is made of, for example, a ceramic and has an insulation property. The ceramic constituting the base21may be a sintered body including, as a main component, aluminum nitride (AlN), aluminum oxide (Al2O3, alumina), silicon carbide (SiC), silicon nitride (Si3N4), or the like. The main component accounts for, for example, 50 mass % or more or 80 mass % or more of the material. When the main component of the base21is aluminum nitride, the base21may include a compound of yttrium (Y). Examples of the Y compound include YAG (Y3Al5O12) and Y2O3.

The substrate W (seeFIG.1) is placed on an upper surface21aof the base21. The upper surface21aof the base21corresponds to a surface facing the substrate W. The substrate W is an example of an object to be processed.

The base21has any shape. For example, in the first embodiment, the shape of the base21is circular in plan view, but it is not limited thereto and may be elliptical, rectangular, trapezoidal, or the like in plan view. The upper surface21aof the base21may be a uniform flat surface, or may be provided with a groove portion, a step, or the like.

The plasma electrode22, the heating element23, and the conductive layer24are located inside the base21. The plasma electrode22is an electrode for generating plasma and extends as a layer along the upper surface21aof the base21. The plasma electrode22has, for example, a disk shape in plan view.

The plasma electrode22is made of, for example, a metal such as nickel (Ni), tungsten (W), titanium (Ti), molybdenum (Mo), platinum (Pt), or the like, or an alloy including at least one of these metals.

The heating element23generates heat by Joule heat generated by electric power supplied from the heater power supply45via the power supply member44. The heating element23extends as a layer along the upper surface21aof the base21. Specifically, the heating element23extends having a circular outer shape in plan view while drawing a predetermined pattern such as a meander shape (seeFIG.3) or a spiral shape.

The heating element23is made of, for example, a metal such as nickel (Ni), tungsten (W), molybdenum (Mo), platinum (Pt), or the like, or an alloy including at least one of these metals.

The conductive layer24functions as an electric field shield that blocks the electric field generated by the plasma electrode22. The conductive layer24extends as a layer along the upper surface21aof the base21. Specifically, the conductive layer24extends having a circular outer shape in plan view while drawing a predetermined pattern.

The conductive layer24is made of, for example, a metal such as nickel (Ni), tungsten (W), molybdenum (Mo), platinum (Pt), or the like, or an alloy including at least one of these metals.

As illustrated inFIG.2, in an example, the plasma electrode22, the heating element23, and the conductive layer24are located in this order in the depth direction with respect to the upper surface21aof the base21, that is, from the upper surface21ato the lower surface21bof the base21. In other words, the heating element23and the conductive layer24are located at different heights in side view seen from a direction parallel to the upper surface21aof the base21.

In addition, as illustrated inFIG.3, when the heating element23and the conductive layer24are viewed in plan view, a pattern shape (second pattern shape) of the conductive layer24is positioned in gaps in a pattern shape (first pattern shape) of the heating element23, for example.

Specifically, a metal wiring line constituting the heating element23extends while drawing the first pattern shape. The first pattern shape is, for example, a meander shape. A metal wiring line constituting the conductive layer24is located in gaps between portions of the metal wiring line constituting the heating element23. Thus, the metal wiring line constituting the conductive layer24extends along the gaps between portions of the metal wiring line constituting the heating element23to form the second pattern shape. The first pattern shape is formed by so-called unicursal writing including no branch, whereas the second pattern shape includes a plurality of branches.

As described above, in the substrate support20according to the first embodiment, the heating element23and the conductive layer24do not overlap each other in plan view. In other words, the conductive layer24according to the first embodiment is located in a region other than the region where the heating element23is located in plan view. The heating element23and the conductive layer24are located at different heights in side view.

This configuration makes it difficult to generate leakage current between the heating element23and the conductive layer24due to a long distance between the heating element23and the conductive layer24, as compared with a case in which the heating element23and the conductive layer24overlap in plan view. Accordingly, the substrate support20according to the first embodiment can suppress the generation of leakage current. Suppressing the generation of leakage current further stabilizes the electrical characteristics of the substrate support20. Thus, the substrate support20according to the first embodiment can enhance the reliability of the substrate support20.

The substrate support20can block the electric field generated by the plasma electrode22, with use of the heating element23and the conductive layer24. In other words, the substrate support20can block the electric field generated by the plasma electrode22, with use of the heating element23, and block the electric field leaking from the gaps between portions of the metal wiring line constituting the heating element23, with use of the conductive layer24. As described above, the conductive layer24is formed having a predetermined pattern shape so as not to overlap the heating element23in plan view. Therefore, the substrate support20according to the first embodiment can maintain the function as the electric field shield while lowering the material cost of the conductive layer24as compared with a case in which the conductive layer24is formed having a uniform flat plate shape.

As illustrated inFIG.3, the conductive layer24may include an outer peripheral portion24alocated on the outermost side in a direction parallel to the upper surface21aof the base21(a planar direction of the base21). In an example, the conductive layer24may include a plurality of curved portions arranged concentrically. The curved portions may have an arc shape or a circumferential shape. The outer peripheral portion24amay be a curved portion located on the outermost side of the curved portions in the planar direction of the base21. Similarly, the heating element23may include an outer peripheral portion23alocated on the outermost side in a direction parallel to the upper surface21aof the base21, that is, in the planar direction of the base21. In an example, the heating element23may include a plurality of arc-shaped curved portions arranged concentrically. In this case, the outer peripheral portion23amay be a curved portion located on the outermost side of the curved portions in the planar direction of the base21.

In plan view, the outer peripheral portion24aof the conductive layer24may be located on an outer side of the outer peripheral portion23aof the heating element23. In other words, the outer peripheral portion24aof the conductive layer24may be located closer to the side surface21cof the base21than the outer peripheral portion23aof the heating element23is.

Such a configuration is more effective in eliminating electric charges accumulating in the outer peripheral portion of the base21than a case in which, for example, the outer peripheral portion24aof the conductive layer24is located further inward of the base21than the outer peripheral portion23aof the heating element23. This can further stabilize the electrical characteristics of the substrate support20and enhance the reliability of the substrate support20.

In addition, as illustrated inFIG.2, the outer peripheral portion24aof the conductive layer24may be located on an outer side of the outer peripheral portion of the plasma electrode22. In other words, the outer peripheral portion24aof the conductive layer24may be located closer to the side surface21cof the base21than the outer peripheral portion of the plasma electrode22is.

Such a configuration allows appropriate blocking of the electric field radiating from the plasma electrode22.

As described above, the heating element23and the conductive layer24are located in this order in the depth direction with respect to the upper surface21aof the base21. In other words, the heating element23is located closer to the upper surface21aof the base21than the conductive layer24is. This allows more efficient heating of the substrate W placed on the upper surface21aof the base21than a case in which, for example, the heating element23and the conductive layer24are located in order of the conductive layer24and the heating element23in the depth direction of the base21.

Manufacturing Method of Substrate Support

Next, an example of a manufacturing method of the substrate support20according to the first embodiment is described. In an example, the substrate support20is formed by layering a plurality of sheets. Specifically, a ceramic green sheet constituting the base21, a metal sheet constituting the plasma electrode22, a metal sheet constituting the heating element23, and a metal sheet constituting the conductive layer24are prepared. Subsequently, the prepared sheets are layered. The ceramic green sheet located in the same layer as the metal sheets of the plasma electrode22, the heating element23, and the conductive layer24are die-cut matching the shapes of the metal sheets, and the metal sheets are located in the die-cut portions.

Subsequently, a laminate body of the ceramic green sheet and the metal sheets is degreased and sintered. The sintering temperature is, for example, equal to or higher than 1100° C. and equal to or lower than 1850° C. Subsequently, holes for inserting the connection terminals of the power supply members41,44and the conductive member46are formed in the sintered laminate body by drilling or the like, and then the terminals are inserted into the formed holes and bonded to the laminate body via a bonding layer. Subsequently, the conductive material is sintered by thermal treatment of the laminate body to which the terminals are attached in a vacuum. The thermal treatment temperature here is, for example, equal to or higher than 500° C. and equal to or lower than 800° C. Thus, the substrate support20is obtained.

Although the metal sheets are used here to form the plasma electrode22, the heating element23, and the conductive layer24, metal paste, wires, or the like may be used instead of the metal sheets.

Variation of First Embodiment

In the first embodiment described above, the example is described in which the heating element23and the conductive layer24are parallel to the upper surface21aof the base21. However, the heating element23and the conductive layer24do not necessarily need to be parallel to the upper surface21aof the base21. For example, the heating element23or the conductive layer24may be warped with respect to the upper surface21aof the base21.

Hereinafter, examples in which the heating element23or the conductive layer24is warped with respect to the upper surface21aof the base21is described with reference toFIGS.4to7.FIGS.4to7are schematic cross-sectional views each illustrating another configuration example of the substrate support20according to the first embodiment.

As illustrated inFIG.4, the conductive layer24may include a central portion24blocated at the centermost position in the direction parallel to the upper surface21aof the base21, that is, in the planar direction of the base21. In an example, the conductive layer24may include a plurality of curved portions arranged concentrically (seeFIG.3). In this case, of these curved portions, the central portion24bmay be a curved portion located at the centermost position in the planar direction of the base21, or a portion located closer to the center side of the base21than the curved portion located at the centermost position is.

As illustrated inFIG.4, the outer peripheral portion24aof the conductive layer24may be located closer to the upper surface21aof the base21than the central portion24bis, in the thickness direction of the base21.

Such a configuration can block the electric field radiating from the plasma electrode22more appropriately. Since the distance between the heating element23and the conductive layer24is large in the central portion24bof the conductive layer24, the generation of leakage current in the central portion24bof the conductive layer24can be preferably suppressed.

As illustrated inFIG.5, the heating element23may include a central portion23blocated at the centermost position in the direction parallel to the upper surface21aof the base21, that is, in the planar direction of the base21. In an example, the heating element23may include a plurality of curved portions arranged concentrically (seeFIG.3). In this case, of these curved portions, the central portion23bmay be a curved portion located at the centermost position in the planar direction of the base21, or a portion located closer to the center side of the base21than the curved portion located at the centermost position is.

As illustrated inFIG.5, the outer peripheral portion23aof the heating element23may be located closer to the upper surface21aof the base21than the central portion23bis, in the thickness direction of the base21.

Since the distance between the heating element23and the conductive layer24is large in the central portion23bof the heating element23in such a configuration, the generation of leakage current at the outer peripheral portion23aof the heating element23can be preferably suppressed.

As illustrated inFIG.6, both the heating element23and the conductive layer24may be warped. In other words, in the heating element23and the conductive layer24, the outer peripheral portions23a,24amay be located closer to the upper surface21aof the base21than the central portions23b,24bare, in the thickness direction of the base21.

Since the heating element23and the conductive layer24are similarly warped in such a configuration, a reduction in part of the distance between the heating element23and the conductive layer24can be suppressed. This preferably suppresses leakage current between the heating element23and the conductive layer24while appropriately blocking the electric field radiating from the plasma electrode22.

As illustrated inFIG.7, in the heating element23and the conductive layer24, the central portions23b,24bmay be located closer to the upper surface21aof the base21than the outer peripheral portions23a,24aare, in the thickness direction of the base21.

The direction of warpage of the heating element23and conductive layer24is not limited to the examples illustrated inFIGS.4to7. For example, the heating element23and the conductive layer24may be warped in opposite directions to each other. In other words, the heating element23and the conductive layer24may be warped such that the central portions23b,24bbecome close to each other or the outer peripheral portions23a,24abecome close to each other.

For example, in manufacturing the substrate support20according to the variation, a ceramic sheet which is die-cut for a metal sheet portion is layered on top of a ceramic sheet which is not die-cut, that is, a solid ceramic sheet. Then, the portion die-cut in the shape of the metal sheet (hereinafter referred to as “die-cut portion”) is partially increased in bulk by being filled with ceramic powder or the like. Subsequently, a metal sheet is placed on the die-cut portion. Thus, when, for example, the outer peripheral portion of the die-cut portion is increased in bulk, the heating element23or the conductive layer24as illustrated inFIGS.4to6can be obtained. When the central portion of the die-cut portion is increased in bulk, the heating element23or the conductive layer24can be obtained as illustrated inFIG.7.

Second Embodiment

Next, an example of applying the plasma treatment apparatus member according to the present disclosure to the shower head30is described.FIG.8is a schematic cross-sectional view illustrating a configuration of the shower head30according to a second embodiment.

As illustrated inFIG.8, the shower head30according to the second embodiment includes a base31, a plasma electrode32, a heating element33, and a conductive layer34. The configuration and arrangement of the base31, the plasma electrode32, the heating element33, and the conductive layer34are the same as, or similar to, those of the base21, the plasma electrode22, and the heating element23of the substrate support20of the first embodiment described above, and are therefore not described here. In an example, the plasma electrode32, the heating element33, and the conductive layer34located inside the base31are located in this order in order of proximity to the lower surface31bof the base31which corresponds to the surface facing the substrate W. The heating element33and the conductive layer34may be warped like the heating element23and the conductive layer24illustrated inFIGS.4to7.

The shower head30according to the second embodiment includes a plurality of ejection holes35and an introduction portion36. The plurality of ejection holes35open in the lower surface31bof the base31and eject a process gas supplied from the process gas supply source54(seeFIG.1). In the example illustrated inFIG.8, the plurality of ejection holes35are through holes penetrating the upper surface31aand the lower surface31bof the base31.

The introduction portion36is made of, for example, a ceramic and connected to the upper surface31aof the base31. The introduction portion36is provided with a recessed portion on a surface facing the upper surface31aof the base31, and a flow path37is formed between the recessed portion and the upper surface31aof the base31. The flow path37extends along the upper surface31aof the base31and is connected to the gas supply pipe51(seeFIG.1) and then to the plurality of ejection holes35. The process gas supplied from the process gas supply source54is introduced into the plurality of ejection holes35via the gas supply pipe51and the flow path37. Then, the plurality of ejection holes35eject the introduced process gas into the chamber10.

The shower head30does not necessarily include the introduction portion36. For example, the plurality of ejection holes35may be respectively connected to a plurality of branch pipes branched from the gas supply pipe51.

Variation of Second Embodiment

The shower head30may include the flow path37inside the base31. This case is described with reference toFIGS.9and10.FIGS.9and10are schematic cross-sectional views each illustrating another configuration example of the shower head30according to the second embodiment.

For example, as illustrated inFIG.9, the flow path37may be located between the plasma electrode32, and the heating element33and the conductive layer34. In the example illustrated inFIG.9, the flow path37is located between the plasma electrode32and the heating element33. In a case in which the plasma electrode32, the heating element33, and the conductive layer34are located in order of the plasma electrode32, the conductive layer34, and the heating element33, in order of proximity to the lower surface31bof the base31, the flow path37may be located between the plasma electrode32and the conductive layer34.

As illustrated inFIG.10, the flow path37may be located between the heating element33and the conductive layer34. In such a configuration, the flow path37interposed between the heating element33and the conductive layer34can make it more difficult to generate leakage current between the conductive layer34and the heating element33.

For example, in manufacturing the shower head30illustrated inFIG.8, a sintered body of the base31including the plasma electrode32, the heating element33, and the conductive layer34is prepared, and then, a plurality of ejection holes35penetrating the upper surface31aand the lower surface31bof the base31can be formed on this sintered body by drilling or the like. For example, in manufacturing the shower head30illustrated inFIGS.9and10, the sintered body of the base31including the plasma electrode32, the heating element33, the conductive layer34, and the flow path37is prepared, and then, the lower surface31bof the base31and the flow path37are made to communicate with each other by drilling or the like in the sintered body to form the plurality of ejection holes35.

Although not illustrated herein, the flow path37may be located farther from the lower surface31bof the base31than the heating element33and the conductive layer34are.

Other Embodiments

The above-mentioned second embodiment has described the example of the shower head30including the plurality of ejection holes35. Alternatively, the substrate support20may also include a plurality of ejection holes. In other words, the substrate support20may include a plurality of ejection holes opened in the upper surface21aof the base21. In that case, the substrate support20can supply, for example, a cooling gas or an intermediary gas, which aids in heat transfer to the substrate W from the substrate support20, to the substrate W through the plurality of ejection holes.

AlthoughFIG.3illustrates the example in which the substrate support20includes a so-called single-zone heater, the substrate support20may include a multi-zone heater capable of individually controlling a plurality of regions on the upper surface21aof the base21. In that case, the substrate support20needs to include a plurality of heating elements23extending over different regions of the upper surface21aof the base21.

Although the above-mentioned embodiments have described the example in which the plasma treatment apparatus1is a capacitively coupled plasma treatment apparatus, the plasma treatment apparatus1may be of any type of plasma treatment apparatus, such as an inductively coupled plasma treatment apparatus or a plasma treatment apparatus in which a gas is excited by surface waves such as microwaves.

As described heretofore, the plasma treatment apparatus member (for example, the substrate support20, the shower head30) according to the embodiments includes the base (for example, the base21,31), the plasma electrode (for example, the plasma electrode22,32), the heating element (for example, the heating element23,33), and the conductive layer (for example, the conductive layer24,34). The base is made of a ceramic and has the facing surface (for example, the upper surface21aof the base21, the lower surface31bof the base31) facing an object to be processed (for example, the substrate W). The plasma electrode is located inside the base. The heating element and the conductive layer are located farther from the facing surface than the plasma electrode is, inside the base. The heating element and the conductive layer do not overlap each other in plan view seen from the direction orthogonal to the facing surface, and are located at different heights in side view seen from the direction parallel to the facing surface.

In the plasma treatment apparatus member according to the embodiments, the distance between the heating element and the conductive layer is larger than that in the case in which the heating element and the conductive layer overlap each other in plan view, thus suppressing the generation of leakage current between the heating element and the conductive layer.

Further effects and variations can be readily derived by those skilled in the art. Thus, a wide variety of aspects of the present invention are not limited to the specific details and a representative embodiment represented and described above. Accordingly, various changes are possible without departing from the spirit or scope of the general inventive concepts defined by the appended claims and their equivalents.

REFERENCE SIGNS