JP5325457B2 - Plasma processing equipment - Google Patents

Plasma processing equipment Download PDF

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JP5325457B2
JP5325457B2 JP2008134501A JP2008134501A JP5325457B2 JP 5325457 B2 JP5325457 B2 JP 5325457B2 JP 2008134501 A JP2008134501 A JP 2008134501A JP 2008134501 A JP2008134501 A JP 2008134501A JP 5325457 B2 JP5325457 B2 JP 5325457B2
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sample
cover
sample stage
outer periphery
temperature
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JP2009283700A (en
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健史 大森
直志 板橋
直行 小藤
豪 宮
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Hitachi High Tech Corp
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<P>PROBLEM TO BE SOLVED: To quickly adjust the temperature of a cover covering the outer circumference of a sample stage independently of the temperature of a sample by disposing a heating mechanism and a cooling mechanism for heating and cooling the cover, inside the outer circumference of the sample stage. <P>SOLUTION: A plasma processing device includes a vacuum processing chamber, a sample stage 1 disposed in the vacuum processing chamber, and a gas introduction means for introducing a processing gas into the vacuum processing chamber, and a high frequency power is supplied into the vacuum processing chamber to generate a plasma, and a sample 2 disposed on the sample stage is subjected to plasma processing by the generated plasma. The sample stage includes a sample stage base portion 1a having a larger diameter than the sample placed on the sample stage, a sample placing portion 1b formed on the sample stage base portion so as to project at a prescribed height and having a smaller diameter than the sample, and a cover 3 covering, like a ring, the outer circumference of the sample placing portion formed projectingly on the sample stage base portion and the outer circumference of the sample stage base portion, and a cooling mechanism 5 for cooling the cover and a heating mechanism 4 for heating the cover are provided in an outer circumferential part of the sample placing portion inside the cover. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、プラズマ処理装置に係り、特に試料を均一に加工することのできる試料台を備えたプラズマ処理装置に関する。   The present invention relates to a plasma processing apparatus, and more particularly to a plasma processing apparatus including a sample stage that can process a sample uniformly.

半導体処理の分野では、ウエハ上に形成される微細構造について、ウエハ面内での均一な加工が求められている。加工の均一性は、プラズマ密度分布、あるいはウエハの面内における温度分布などを調整することで改善されてきた。   In the field of semiconductor processing, uniform processing within the wafer surface is required for the fine structure formed on the wafer. The uniformity of processing has been improved by adjusting the plasma density distribution or the temperature distribution in the plane of the wafer.

特許文献1には、試料台の外周を被覆する試料台外周カバー(フォーカスリング)内に配管を設置し、該配管内に液体の媒体を流すことで、試料台外周カバーを冷却して、温度調節するエッチング装置が開示されている。この装置では、前記液体の媒体を冷却するチラーによって媒体の温度を設定し、これにより試料台外周カバーの温度が調整される。
特開平11−330047号公報
In Patent Document 1, a pipe is installed in a sample stand outer cover (focus ring) that covers the outer periphery of the sample stand, and a liquid medium is allowed to flow through the pipe, thereby cooling the sample stand outer cover and An etching apparatus for adjusting is disclosed. In this apparatus, the temperature of the medium is set by a chiller that cools the liquid medium, thereby adjusting the temperature of the sample stage outer periphery cover.
Japanese Patent Laid-Open No. 11-330047

近年の半導体加工では、各種の材料からなる多数の層に対してそれぞれ加工条件を切り替えて処理が施される。プラズマエッチングの場合は、エッチング処理の条件(例えばプラズマの励起パワー、使用ガスの種類またその混合比、ガス圧力、バイアス出力、電極あるいはリアクタ壁等の温度設定等)が変更される。このとき、ウエハ面内における加工をナノメートルないしサブナノメートルのオーダーで均一化するためには、試料台外周カバーの温度を各加工ステップにおいて最適となるよう設定する必要がある。また、各加工ステップの処理時間は数秒から数分であるので、高速に試料台外周カバーの温度を調節する必要がある。   In recent semiconductor processing, processing is performed by switching processing conditions for a large number of layers made of various materials. In the case of plasma etching, etching process conditions (for example, plasma excitation power, types of gas used and their mixing ratio, gas pressure, bias output, temperature setting of electrodes or reactor walls, etc.) are changed. At this time, in order to make the processing in the wafer plane uniform in the order of nanometers or sub-nanometers, it is necessary to set the temperature of the sample table outer periphery cover to be optimal in each processing step. In addition, since the processing time of each processing step is several seconds to several minutes, it is necessary to adjust the temperature of the sample table outer periphery cover at high speed.

ところで、一般的なチラーによる冷媒自体の温度変更の速度は1分間に2℃から5℃程度である。しかし、チラーに、電極や試料台外周カバー等の負荷を接続し、実際に加工処理を行うとその負荷の温度変化は1分間に0.1℃から0.001℃程度まで落ち込むことがある。特に負荷が試料台外周カバーの場合は、熱伝導率の低い材料が用いられるため、その表面の温度の調整速度は著しく遅くなる。   By the way, the speed of the temperature change of the refrigerant itself by a general chiller is about 2 ° C. to 5 ° C. per minute. However, when a load such as an electrode or a sample table outer peripheral cover is connected to the chiller and the processing is actually performed, the temperature change of the load may drop from about 0.1 ° C. to about 0.001 ° C. per minute. In particular, when the load is a sample table outer periphery cover, a material having a low thermal conductivity is used, so that the temperature adjustment speed of the surface is remarkably slow.

このため、多数の加工ステップに対応しながらウエハ外周部での加工を均一にするためには、試料台外周カバー部の温度を高速に変更することが求められる。   For this reason, in order to make the processing at the outer peripheral portion of the wafer uniform while supporting a large number of processing steps, it is required to change the temperature of the outer peripheral cover portion of the sample stage at high speed.

また、最近の半導体デバイスには多種の新材料、例えば高誘電率材料や磁性体材料等の難エッチング性の材料が使用される。難エッチング性の材料は、その蒸気圧が非常にく、また反応性に乏しく、常温付近ではエッチング速度が非常に遅くエッチングが困難である。 このため、これらの難エッチング性の材料をエッチングするには、ウエハ温度を100℃から500℃の高温に設定しなければならない。 Further, various new materials such as high dielectric constant materials and magnetic materials are used for recent semiconductor devices. Hardly etchable material, its vapor pressure is rather very low, also poor in reactivity, the etch rate in the vicinity of room temperature is very slow difficult etching. Therefore, in order to etch these difficult-to-etch materials, the wafer temperature must be set to a high temperature of 100 ° C. to 500 ° C.

このような高温の条件においてウエハに均一な処理を施すためには、試料台外周カバーを液体媒体による加熱の上限を超える温度に設定する必要が生じる。さらに、加工処理後における試料台外周カバー部のクリーニング処理においても、試料台外周カバーの表面を高温に加熱しなければならない。   In order to perform uniform processing on the wafer under such a high temperature condition, it is necessary to set the sample table outer periphery cover to a temperature exceeding the upper limit of heating by the liquid medium. Furthermore, also in the cleaning process of the sample stage outer periphery cover part after the processing, the surface of the sample stage outer periphery cover must be heated to a high temperature.

また、近年では、ウエハの大口径化と半導体加工装置や設備の高コスト化に対応するため歩留まりの向上が求められ、また、均一な加工、特にウエハ外周部における微細構造の均一性について更なる向上が求められている。   Also, in recent years, yields have been required to be increased in order to cope with larger wafer diameters and higher costs for semiconductor processing equipment and facilities, and more uniform processing, especially the uniformity of the microstructure on the outer periphery of the wafer. There is a need for improvement.

一般的に、微細パターンの加工形状はウエハ外周部分で大きく変化する。例えば、ウエハの中心部分では入射する各粒子の割合や速度分布(角度分布とエネルギー分布)は均一になりやすいのに対し、ウエハの外周部分では前記粒子の種類や分布は不均一になりやすいからである。また、ウエハと試料台の外周を被覆する試料台外周カバー間での材質の違いあるいは温度の違いがある場合、それらの違いによりウエハの外周付近における各種ラジカルの分布は不均一になる。   In general, the processing shape of the fine pattern varies greatly at the outer peripheral portion of the wafer. For example, while the ratio and velocity distribution (angle distribution and energy distribution) of each incident particle are likely to be uniform at the central portion of the wafer, the type and distribution of the particles are likely to be non-uniform at the outer peripheral portion of the wafer. It is. Further, when there is a difference in material or temperature between the sample table outer periphery cover covering the outer periphery of the wafer and the sample table, the distribution of various radicals in the vicinity of the outer periphery of the wafer becomes non-uniform due to the difference.

本発明は、これらの問題点に鑑みてなされたもので、試料台外周カバー内に該カバーを加熱および冷却する加熱機構および冷却機構を配置し、試料台外周カバーを試料の温度とは独立に、かつ高速に温度調整することのできるプラズマ処理装置を提供するものである。   The present invention has been made in view of these problems. A heating mechanism and a cooling mechanism for heating and cooling the cover are arranged in the sample table outer cover, and the sample table outer cover is made independent of the temperature of the sample. And a plasma processing apparatus capable of adjusting the temperature at high speed.

本発明は上記課題を解決するため、次のような手段を採用した。   In order to solve the above problems, the present invention employs the following means.

真空処理室と、該真空処理室内に配置された試料台と、前記真空処理室に処理ガスを導入するガス導入手段を備え、前記真空処理室内に高周波電力を供給してプラズマを生成し、生成したプラズマにより前記試料台上に配置した試料にプラズマ処理を施すプラズマ処理装置において、前記試料台は、載置する試料よりも大径の試料台基台部と該試料台基台部上に所定高さ突出して形成した前記試料よりも小径の試料載置部と、前記試料台基台部上に突出して形成された試料載置部の外周および前記試料台基台部の外周をリング状に被覆する外周カバーを備え、前記外周カバーの前記試料載置部の外周部分には、外周カバーを冷却するための冷却機構および外周カバーを加熱するための加熱機構を備えるとともに上下に分割され、前記上下に分割された一方の部分には前記加熱機構を備え、前記上下に分割された他方の部分には前記冷却機構を備える。
A vacuum processing chamber, a sample stage arranged in the vacuum processing chamber, and a gas introducing means for introducing a processing gas into the vacuum processing chamber, and generating high-frequency power into the vacuum processing chamber to generate plasma In the plasma processing apparatus for performing plasma processing on a sample placed on the sample stage by the plasma that has been performed, the sample stage has a sample stage base part having a diameter larger than the sample to be placed and a predetermined part on the sample stage base part A sample mounting portion having a smaller diameter than the sample formed to protrude from the height, an outer periphery of the sample mounting portion formed protruding on the sample base base portion, and an outer periphery of the sample base base portion in a ring shape An outer peripheral cover for covering, the outer peripheral portion of the sample mounting portion of the outer peripheral cover is provided with a cooling mechanism for cooling the outer peripheral cover and a heating mechanism for heating the outer peripheral cover, and is divided vertically, Minutes up and down It has been the one part provided with the heating mechanism, the divided other part to the vertical provided the cooling mechanism.

本発明は、以上の構成を備えるため、試料台外周カバーを試料の温度とは独立にかつ高速に温度調整することができる。   Since the present invention has the above-described configuration, the temperature of the sample table outer peripheral cover can be adjusted at high speed independently of the temperature of the sample.

以下、最良の実施形態を添付図面を参照しながら説明する。図1は、本発明の第1の実施形態にかかるプラズマ処理装置を示す図である。この装置は試料(ウエハ)を支持し処理するための下部電極として試料台1と試料台外周カバー3を備える。試料台外周カバー3は、その内部に加熱機構4と冷却機構5を備える。   Hereinafter, the best embodiment will be described with reference to the accompanying drawings. FIG. 1 is a diagram showing a plasma processing apparatus according to a first embodiment of the present invention. This apparatus includes a sample table 1 and a sample table outer periphery cover 3 as lower electrodes for supporting and processing a sample (wafer). The sample stage outer periphery cover 3 includes a heating mechanism 4 and a cooling mechanism 5 therein.

加熱機構4としては、シーズヒータあるいは溶射ヒータ等のヒータを用いることができる。冷却機構5としては、液体冷却用の流路を設け該流路に冷媒を流す等の形式の冷却機構を用いることができる。   As the heating mechanism 4, a heater such as a sheathed heater or a sprayed heater can be used. As the cooling mechanism 5, a cooling mechanism of a type in which a flow path for liquid cooling is provided and a refrigerant is allowed to flow through the flow path can be used.

また、プラズマ処理装置は、平板電極、磁場生成用コイル、マイクロ波の導波路等の図示しないプラズマ生成手段と処理壁10を備えており、試料台1の周囲の空間にプラズマを生成する。試料2は試料台1の上に設置され、静電チャックやクランプ等を用いて固定される。試料台1は、その内部に、前記加熱機構4及び冷却機構5と同様な加熱機構及び冷却機構を備えることで、その温度は調節される。   The plasma processing apparatus includes plasma generating means (not shown) such as a plate electrode, a magnetic field generating coil, and a microwave waveguide, and a processing wall 10, and generates plasma in the space around the sample stage 1. The sample 2 is placed on the sample stage 1 and fixed using an electrostatic chuck or a clamp. The sample stage 1 is provided with a heating mechanism and a cooling mechanism similar to the heating mechanism 4 and the cooling mechanism 5 in its interior, so that its temperature is adjusted.

試料2と試料台1の境界にはヘリウム等の伝熱ガスを流して試料2と試料台1の間の熱伝達を促進することで試料2の温度が調節される。試料台外周カバーは、その下にある試料台1の上に(試料台外周カバーとその下にある試料台1間に伝熱ガスを供給することなく)単に置かれているだけであり、その重力及び試料台との摩擦により所定位置に保持されている。 The temperature of the sample 2 is adjusted by flowing a heat transfer gas such as helium at the boundary between the sample 2 and the sample stage 1 to promote heat transfer between the sample 2 and the sample stage 1. The sample table outer cover 3 is simply placed on the sample table 1 below (without supplying heat transfer gas between the sample table outer cover 3 and the sample table 1 below it). It is held at a predetermined position by the gravity and friction with the sample table.

前記試料台1は、載置する試料よりも大径の試料台基台部1aと該試料台基台部1a上に所定高さ突出して形成した前記試料2よりも小径の試料載置部1bを備える。また、前記試料台基台部1aの上面に突出して形成された試料載置部1bの外周および前記試料台基台部1aの外周には、上述したようにそれらをリング状に被覆する試料台外周カバー3を備える。 The sample stage 1 includes a sample stage base part 1a having a diameter larger than that of the sample to be placed, and a sample placing part 1b having a diameter smaller than that of the sample 2 formed so as to protrude on the sample stage base part 1a by a predetermined height. Is provided. Further, as described above, on the outer periphery of the sample mounting portion 1b and the outer periphery of the sample stand base portion 1a formed so as to protrude from the upper surface of the sample stand base portion 1a, a sample stand that covers them in a ring shape as described above. An outer cover 3 is provided.

試料2は、試料台外周カバー3の表面に達するように、試料載置部1bの上に設置され固定される。これは試料台1と静電チャックをプラズマの侵食から守るためである。一般的に、試料台外周カバー3の上に位置する試料2の外周部分の半径方向長さは1mmから10mm程度である。   The sample 2 is installed and fixed on the sample mounting portion 1b so as to reach the surface of the sample table outer periphery cover 3. This is to protect the sample stage 1 and the electrostatic chuck from plasma erosion. In general, the radial length of the outer peripheral portion of the sample 2 located on the sample table outer peripheral cover 3 is about 1 mm to 10 mm.

試料2が試料台外周カバー3の一部の上に位置し、かつ試料台外周カバー3を高温に加熱して使用する場合には、試料台外周カバー3が熱膨張して試料を持ち上げてしまわないように、試料台外周カバー3と試料2との間に十分な隙間が与えておくことが必要である。 なお、この間隙は、試料の裏面からの微粒子の放出あるいは試料台と試料台に備えられている静電チャックへのプラズマによる侵食を防ぐため、外周カバー3の熱膨張によって試料2を持ち上げることがない長さを持った上で、できるだけ狭い方が良い。   When the sample 2 is positioned on a part of the sample table outer cover 3 and the sample table outer cover 3 is heated to a high temperature and used, the sample table outer cover 3 is thermally expanded to lift the sample. It is necessary to provide a sufficient gap between the sample table outer periphery cover 3 and the sample 2 so as not to occur. This gap may lift the sample 2 by thermal expansion of the outer peripheral cover 3 in order to prevent discharge of fine particles from the back surface of the sample or plasma erosion to the electrostatic chuck provided on the sample stage and the sample stage. It is better to be as narrow as possible while having no length.

試料2より外側の試料台外周カバー3の表面の高さと形状は任意であるが、試料2の裏面へのプラズマの侵食を防ぎ、試料2の外周部でのプラズマを均一にすることを考慮すると、試料台外周カバー3の外周部の表面は試料2より高くする方が良い。試料台外周カバー3の外周部の表面を試料2より高くする場合には、試料2が熱膨張によって試料台外周カバーに接触し試料が持ち上がってしまうことと、試料の裏面へのプラズマの侵食を防ぐことを考慮して、試料2の側面と試料台外周カバー3の間にも必要最小限の隙間を設定するのが好ましい。   The height and shape of the surface of the sample table outer periphery cover 3 outside the sample 2 are arbitrary, but considering that the plasma erosion to the back surface of the sample 2 is prevented and the plasma on the outer periphery of the sample 2 is made uniform. The surface of the outer peripheral portion of the sample table outer cover 3 should be higher than that of the sample 2. When the surface of the outer peripheral portion of the sample stage outer cover 3 is made higher than that of the sample 2, the sample 2 comes into contact with the sample stage outer cover due to thermal expansion and the sample is lifted, and plasma erosion on the back surface of the sample is caused. In consideration of prevention, it is preferable to set a necessary minimum gap between the side surface of the sample 2 and the sample table outer periphery cover 3.

試料台外周カバー3は、プラズマからの入熱と、加熱機構4および冷却機構5から伝達される熱衝撃より発生する応力に耐える必要がある。さらに試料台1と試料台外周カバー3の熱による膨張と収縮により、試料台1と試料台外周カバー3の間で応力が発生する場合には、その応力に耐えうる材料を試料台1と試料台外周カバー3に用いるか、試料台1と試料台外周カバー3の間に隙間を設けておくべきである。   The sample stage outer periphery cover 3 needs to withstand the stress generated by heat input from plasma and thermal shock transmitted from the heating mechanism 4 and the cooling mechanism 5. Further, when stress is generated between the sample stage 1 and the sample stage outer periphery cover 3 due to expansion and contraction due to heat of the sample stage 1 and the sample stage outer periphery cover 3, a material capable of withstanding the stress is selected from the sample stage 1 and the sample stage. It should be used for the table outer periphery cover 3, or a gap should be provided between the sample table 1 and the sample table outer cover 3.

一般的に試料台外周カバーには酸化ケイ素やアルミナ等の絶縁性材料が用いられる。絶縁性材料は熱伝導率が低く、このため、温度調整の時定数が非常に長くなる。しかしながら、本実施形態では、プラズマに曝される試料台外周カバー3の表面付近の試料台外周カバー内部に加熱機構4および冷却機構5を設ける。このため、試料台外周カバー3の表面の温度を高速に調節することができる。   Generally, an insulating material such as silicon oxide or alumina is used for the sample table outer periphery cover. The insulating material has a low thermal conductivity, and therefore the time constant for temperature adjustment becomes very long. However, in this embodiment, the heating mechanism 4 and the cooling mechanism 5 are provided inside the sample table outer periphery cover near the surface of the sample table outer periphery cover 3 exposed to plasma. For this reason, the surface temperature of the sample stage outer periphery cover 3 can be adjusted at high speed.

また、試料台外周カバー3と試料台1との間の熱の移動は小さいので、試料台外周カバー3の熱が試料台1を通して試料に伝達して影響を与えることはほとんどない。また、試料2あるいは試料台1の熱が試料台外周カバー3に伝達して影響を与えることもほとんどない。このため、試料2と試料台外周カバー3とは、温度を独立に調節することができる。また、試料裏面のヘリウムガスの圧力を調整すること、および試料台1の温度を調節することにより試料2の温度を均一または所望の分布としながら、試料2と試料台外周カバー3が所望の温度差を持つように調節することができる。   Further, since the heat transfer between the sample stage outer cover 3 and the sample stage 1 is small, the heat of the sample stage outer cover 3 is hardly transmitted to the sample through the sample stage 1 and is not affected. Further, the heat of the sample 2 or the sample stage 1 is hardly transmitted to the sample stage outer periphery cover 3 and is not affected. For this reason, the temperature of the sample 2 and the sample stage outer periphery cover 3 can be adjusted independently. In addition, by adjusting the pressure of the helium gas on the back surface of the sample and adjusting the temperature of the sample table 1, the sample 2 and the sample table outer peripheral cover 3 have a desired temperature while the temperature of the sample 2 is made uniform or has a desired distribution. Can be adjusted to have a difference.

さらに、加熱機構4と冷却機構5の出力を制御することによって、より高速に試料台外周カバー3の温度を調節することができ、さらに所望の温度で安定化させることができる。 試料台外周カバー1は試料台外周カバーの温度を計測する図示しない計測部を備えており、該計測部により計測された温度を用いて加熱機構および冷却機構についてフィードバック制御等を行うことで、試料台外周カバー1の温度の調節を行うことができる。   Furthermore, by controlling the outputs of the heating mechanism 4 and the cooling mechanism 5, the temperature of the sample table outer periphery cover 3 can be adjusted at a higher speed, and can be stabilized at a desired temperature. The sample table outer periphery cover 1 includes a measurement unit (not shown) that measures the temperature of the sample table outer periphery cover. By using the temperature measured by the measurement unit, feedback control or the like is performed on the heating mechanism and the cooling mechanism. The temperature of the table outer periphery cover 1 can be adjusted.

図2,3は、横軸を電極の径方向とし、試料台外周カバー表面の温度Tsを変化させたときのラジカル分布の変化とCD値の変化の概要を示す図である。   2 and 3 are diagrams showing an outline of changes in radical distribution and changes in CD value when the horizontal axis is the radial direction of the electrode and the temperature Ts of the sample table outer periphery cover surface is changed.

前述のように、試料面内における微細パターンの均一な加工の実現には、その加工に合わせた最適なラジカル分布を実現する必要がある。   As described above, in order to realize uniform processing of a fine pattern in the sample surface, it is necessary to realize an optimum radical distribution in accordance with the processing.

図2に示すように、試料台外周カバーの温度を変更することでその表面温度に対応したラジカル分布を実現することができる。例えば、図3のTs=50℃のときのCD値の径方向分布に示されるように、試料台外周カバーの温度を50℃に調節することで試料面内のCD値を均一化することができる。   As shown in FIG. 2, radical distribution corresponding to the surface temperature can be realized by changing the temperature of the sample stage outer periphery cover. For example, as shown in the radial distribution of the CD value when Ts = 50 ° C. in FIG. 3, the CD value in the sample surface can be made uniform by adjusting the temperature of the outer periphery cover of the sample stage to 50 ° C. it can.

ここで、本実施形態にかかる試料台外周カバー3の温度調節の機能について説明する。図4ないし図7は、加熱機構4としてヒータ(電熱ヒータ)を用い、冷却機構5として冷媒用流路を用いた場合の試料処理中における各部の温度変化を示したものである。   Here, the temperature adjustment function of the sample stage outer periphery cover 3 according to the present embodiment will be described. 4 to 7 show the temperature change of each part during the sample processing when a heater (electric heater) is used as the heating mechanism 4 and a refrigerant flow path is used as the cooling mechanism 5.

図4および図6は冷却機構のみを使用して温度を調節した場合、図5および図7は冷却機構と加熱機構の両方を使用して温度を設定した場合である。また図4および図5は試料処理を開始した場合であり、図6および図7は試料処理中にステップ切り替えをした場合の温度変化である。   4 and 6 show the case where the temperature is adjusted using only the cooling mechanism, and FIGS. 5 and 7 show the case where the temperature is set using both the cooling mechanism and the heating mechanism. 4 and 5 show the case where the sample processing is started, and FIGS. 6 and 7 show the temperature change when the step is switched during the sample processing.

図4に示すように、冷媒のみで試料台外周カバー表面の温度を一定に調整する場合にはプラズマからの入熱によって、試料台外周カバー表面の温度は徐々に上昇する。一方、図5に示すように、ヒータと冷媒の両方を用いて一定温度に調整する場合には、プラズマからの入熱に対応してヒータの出力を抑えることで、設定した温度に安定させることができる。   As shown in FIG. 4, when the temperature of the sample table outer periphery cover surface is adjusted to be constant only with the refrigerant, the temperature of the sample table outer periphery cover surface gradually increases due to heat input from the plasma. On the other hand, as shown in FIG. 5, when adjusting to a constant temperature using both the heater and the refrigerant, the heater output is suppressed in response to the heat input from the plasma, so that the set temperature is stabilized. Can do.

ヒータによる試料台外周カバーの加熱機構は、ヒータ自身が試料台外周カバーに熱的に結合した直接的な加熱であり、その発熱量はヒータへ供給する電力に比例する。さらにヒータの発熱部の熱容量が小さいために、供給電力の増減に対するヒータ温度の応答性は非常に速く、例えばヒータ自身の温度は一秒間あたり100度以上の昇温が容易に可能である。   The heating mechanism of the sample table outer periphery cover by the heater is direct heating in which the heater itself is thermally coupled to the sample table outer periphery cover, and the amount of generated heat is proportional to the power supplied to the heater. Furthermore, since the heat capacity of the heat generating portion of the heater is small, the response of the heater temperature to the increase or decrease of the supplied power is very fast. For example, the temperature of the heater itself can be easily raised to 100 degrees or more per second.

一方、チラーによる冷却は、チラー内部の冷却源で液体媒体の熱を奪いその冷媒によって試料台外周カバーの熱を奪うという冷媒を用いた間接的な冷却方式である。さらに冷媒の熱容量はヒータの熱容量に比べ非常に大きいため、温度制御の応答性はゆるやかとなる。このため、試料台外周カバーに加熱機構と冷却機構を設け、そのいずれか(もしくは両方)を温度調整の応答性の高い構造とし、両者の出力の制御を行うことで、試料処理中の試料台外周カバーの温度を高速に所望の温度に設定でき、プラズマからの入熱を相殺しながら設定温度に安定させることができる。   On the other hand, the cooling by the chiller is an indirect cooling method using a refrigerant in which the heat of the liquid medium is taken away by a cooling source inside the chiller and the heat of the outer periphery cover of the sample table is taken away by the refrigerant. Furthermore, since the heat capacity of the refrigerant is much larger than the heat capacity of the heater, the responsiveness of temperature control is moderate. For this reason, the sample table outer cover is provided with a heating mechanism and a cooling mechanism, and either (or both) has a structure with high responsiveness to temperature adjustment, and the output of both is controlled, so that the sample table during sample processing can be controlled. The temperature of the outer peripheral cover can be set to a desired temperature at high speed, and can be stabilized at the set temperature while offsetting heat input from the plasma.

なお、プラズマからの熱を除去するために冷媒の温度を下げて使用する場合は、試料台外周カバー部の温度の応答性は前述のチラーの冷却速度に律束される。チラーの冷却に関する応答性は前述のようにヒータに比べて非常に遅いため、温度を設定温度に保つための調整は困難となる。   In addition, when using it, reducing the temperature of a refrigerant | coolant in order to remove the heat | fever from a plasma, the responsiveness of the temperature of a sample stand outer periphery cover part is bounded by the cooling rate of the above-mentioned chiller. As described above, the responsiveness related to the cooling of the chiller is very slow compared to the heater, so that adjustment for keeping the temperature at the set temperature becomes difficult.

図6および図7はエッチング条件の異なる2つの加工ステップ間で温度を変更する場合を示す。継続期間が数秒から数分間である各加工ステップに対応して、試料台外周カバーの温度を応答性よく調節するためには、図7に示すように、ヒータ等の加熱機構と液体冷却等による冷却機構の2つを設け、その両者の温度を制御することが好ましい。これにより、加工中の各ステップに最適な温度を提供し、その最適温度で安定させることができる。また、試料処理とクリーニング処理の切り換え時等においても、それぞれの処理に対して最適な温度に設定することもできる。   6 and 7 show a case where the temperature is changed between two processing steps having different etching conditions. In order to adjust the temperature of the sample table outer periphery cover with good responsiveness corresponding to each processing step having a duration of several seconds to several minutes, as shown in FIG. 7, a heating mechanism such as a heater and liquid cooling are used. It is preferable to provide two cooling mechanisms and control the temperature of both. Thereby, the optimal temperature can be provided for each step during processing, and the temperature can be stabilized at the optimal temperature. Also, at the time of switching between the sample processing and the cleaning processing, it is possible to set the optimum temperature for each processing.

さらに難エッチング性の材料の加工時に要求される高温領域においても、高速な温度調節を行うことが可能であり、難エッチング性の材料が試料台外周カバー表面に堆積した場合のクリーニングも効率的に行うことができる。   In addition, high-temperature temperature control is possible even in the high-temperature region required when processing difficult-to-etch materials, and cleaning is also efficient when difficult-to-etch materials are deposited on the outer surface of the sample table. It can be carried out.

なお、試料台外周カバー材3の材料としては、任意の絶縁体を用いることができる。石英等の熱膨張率の小さく熱衝撃に強い材料を用いることにより、試料台外周カバーの膨張と収縮を抑えることができる。   In addition, as a material of the sample stand outer periphery cover material 3, an arbitrary insulator can be used. By using a material having a low coefficient of thermal expansion and strong against thermal shock, such as quartz, the expansion and contraction of the sample table outer periphery cover can be suppressed.

また、試料台外周カバー3の材料として任意の金属や半導体を用いることができる。この場合は試料台へ印加されるバイアスパワーを試料台外周カバー3を通してプラズマへ結合することができる。また金属材料を用いることで、試料台外周カバー3の加工が容易となりコストを抑えることができる。さらに後述するように、試料台外周カバー3と試料台1の間に絶縁部材を配置することにより、試料台外周カバー3を通してプラズマに結合するバイアス出力を調節することができる。   Further, any metal or semiconductor can be used as the material of the sample stage outer periphery cover 3. In this case, the bias power applied to the sample stage can be coupled to the plasma through the sample stage outer periphery cover 3. Further, by using a metal material, the sample table outer periphery cover 3 can be easily processed, and the cost can be reduced. Further, as will be described later, by disposing an insulating member between the sample stage outer periphery cover 3 and the sample stage 1, the bias output coupled to the plasma through the sample stage outer periphery cover 3 can be adjusted.

さらに、試料台外周カバー3の材料として、任意の金属や半導体にめっきをしたり、あるいは溶射等による絶縁膜を被覆したものとすることができる。この場合は、導電性材料の母材と絶縁膜の熱膨張係数の違いによって起こる絶縁膜のひび割れや剥離に耐えられる範囲内で温度を調節する必要がある。このような場合には、前記絶縁膜はプラズマへの暴露に耐えられる組成とするのが好ましい。また、試料台外周カバー3の表面を研磨して平滑化することにより、試料処理中に試料台外周カバー3の表面にできる堆積膜や試料台外周カバー3から放出される微粒子を少なくすることができる。   Furthermore, as a material of the sample stage outer periphery cover 3, any metal or semiconductor can be plated, or an insulating film can be coated by thermal spraying or the like. In this case, it is necessary to adjust the temperature within a range that can withstand cracking or peeling of the insulating film caused by a difference in thermal expansion coefficient between the base material of the conductive material and the insulating film. In such a case, it is preferable that the insulating film has a composition that can withstand exposure to plasma. Further, by polishing and smoothing the surface of the sample table outer periphery cover 3, the deposited film formed on the surface of the sample table outer periphery cover 3 and the fine particles emitted from the sample table outer periphery cover 3 can be reduced during sample processing. it can.

図8ないし図15は、他の実施形態を説明する図である。   8 to 15 are diagrams for explaining other embodiments.

図8は、試料台外周カバー3内に加熱機構4および冷却機構5を配置した例を示す。加熱機構4および冷却機構5は、試料台外周カバー3の内部において、任意の大きさ、形状、方向とすることができる。さらに加熱機構4および冷却機構5は試料台外周カバー3の内部において、それぞれ規則的または不規則に蛇行した形で埋設することができる。   FIG. 8 shows an example in which the heating mechanism 4 and the cooling mechanism 5 are arranged in the sample stage outer periphery cover 3. The heating mechanism 4 and the cooling mechanism 5 can have any size, shape, and direction inside the sample stage outer periphery cover 3. Furthermore, the heating mechanism 4 and the cooling mechanism 5 can be embedded in the sample table outer periphery cover 3 in a meandering manner in a regular or irregular manner.

図9は、試料台外周カバー3内に冷却機構5として、冷媒を流すための配管6を埋設した例を示す図である。冷却機構5の配管6は、配管と試料台外周カバー3間は熱の伝導を促進するために、溶着あるいはエラストマー接着剤を用いて接着するのが好ましい。   FIG. 9 is a view showing an example in which a pipe 6 for flowing a refrigerant is embedded as a cooling mechanism 5 in the sample table outer periphery cover 3. The piping 6 of the cooling mechanism 5 is preferably bonded by welding or using an elastomer adhesive in order to promote heat conduction between the piping and the sample stage outer cover 3.

図10は、試料台外周カバー3内に複数の加熱機構7と複数の冷却機構8を設けた例を示す図である。複数の冷却機構を構成する複数の配管はそれぞれ独立して形成するか、または試料台外周カバーの任意の箇所でその一部または全部を直列または並列に接続して構成することができる。複数の加熱機構を構成するヒータについても同様に構成することができる。   FIG. 10 is a view showing an example in which a plurality of heating mechanisms 7 and a plurality of cooling mechanisms 8 are provided in the sample stage outer periphery cover 3. The plurality of pipes constituting the plurality of cooling mechanisms can be formed independently of each other, or can be configured by connecting some or all of them in series or in parallel at an arbitrary position of the sample stage outer periphery cover. The heaters constituting the plurality of heating mechanisms can be similarly configured.

図11は、試料台外周カバーを分割して構成した例を示す図である。図に示すように、試料台外周カバー3は上部試料台外周カバー3a、下部試料台外周カバー3bに分割され、上部試料台外周カバー3a内に加熱機構4を配置し、下部試料台外周カバー3b内に冷却機構および静電チャック用の電極9を設ける。   FIG. 11 is a diagram showing an example in which the sample table outer periphery cover is divided. As shown in the figure, the sample table outer cover 3 is divided into an upper sample table outer cover 3a and a lower sample table outer cover 3b. A heating mechanism 4 is arranged in the upper sample table outer cover 3a, and the lower sample table outer cover 3b. Inside, an electrode 9 for a cooling mechanism and an electrostatic chuck is provided.

この例では、上下に分割した試料台外周カバーの間の熱の伝導を促進するために、下部試料台外周カバー3b内に静電チャック用電極を配置し、静電吸着力により上下の外周カバーを吸着固定する。なお、上下に分割した試料台外周カバーの間にガスを流して両者間の熱の伝導を促進させることができる。   In this example, in order to promote the conduction of heat between the upper and lower sample stage outer cover, an electrostatic chuck electrode is arranged in the lower sample stage outer cover 3b, and the upper and lower outer covers are formed by electrostatic attraction force. Adsorb and fix. In addition, it is possible to promote the conduction of heat between the two by allowing a gas to flow between the upper and lower sample stage outer cover.

この例では、プラズマに曝される上部試料台外周カバー3aはプラズマによる侵食に耐える材料で構成する必要があるが、下部試料台外周カバー3bはプラズマに曝されることが少ないことから、プラズマによる侵食に弱い材料を用いることができる。   In this example, the upper sample stage outer periphery cover 3a exposed to the plasma needs to be made of a material that resists erosion by plasma, but the lower sample stage outer cover 3b is less exposed to the plasma. Materials that are vulnerable to erosion can be used.

図12は、試料台外周カバー3の表面にシールド12を配置した例を示す図である。この例では、さらに、試料台外周カバー3内に配置した静電チャック用電極9により試料台外周カバー3とシールド12を吸着固定する。なお、熱の伝導を促進するために試料台外周カバー3とシールド12の間にガスを流して両者間の熱の伝導を促進させることができる。なお、シールド12は加熱機構や冷却機構を持たないため、シールド12がプラズマによって侵食され劣化した場合等において簡易に交換することができる。   FIG. 12 is a view showing an example in which the shield 12 is arranged on the surface of the sample stage outer periphery cover 3. In this example, the sample table outer periphery cover 3 and the shield 12 are attracted and fixed by the electrostatic chuck electrode 9 disposed in the sample table outer periphery cover 3. In addition, in order to accelerate | stimulate heat conduction, gas can be flowed between the sample stand outer periphery cover 3 and the shield 12, and heat | fever conduction between both can be promoted. Since the shield 12 does not have a heating mechanism or a cooling mechanism, the shield 12 can be easily replaced when the shield 12 is eroded and deteriorated by plasma.

図13は、試料台外周カバー3と試料台1の間に絶縁部材13を備える例を示す図である。試料台外周カバー3として導電性材料または導電性材料表面に絶縁膜を備えるものを用いた場合においては、前記絶縁部材7を配置することにより、試料台1に印加されるバイアスパワーの試料台外周カバー3への結合を遮断また減衰させることができる。   FIG. 13 is a diagram illustrating an example in which an insulating member 13 is provided between the sample table outer periphery cover 3 and the sample table 1. In the case where a conductive material or a material provided with an insulating film on the surface of the conductive material is used as the sample table outer peripheral cover 3, the sample table outer periphery of the bias power applied to the sample table 1 is provided by arranging the insulating member 7. The coupling to the cover 3 can be cut off or attenuated.

図14は、前記試料台上部と向かい合う前記外周カバーの面に、外周カバーを冷却するための冷却機構および外周カバーを加熱するための加熱機構を熱的に接触させながら固定した例を示す図である。この例では、試料台外周カバー3は試料台の上に単に置かれているため、前述のように試料2とは独立して試料台外周カバー3の温度を調節することができる。   FIG. 14 is a diagram showing an example in which a cooling mechanism for cooling the outer peripheral cover and a heating mechanism for heating the outer peripheral cover are fixed to the surface of the outer peripheral cover facing the upper part of the sample table while being in thermal contact with each other. is there. In this example, since the sample stage outer cover 3 is simply placed on the sample stage, the temperature of the sample stage outer cover 3 can be adjusted independently of the sample 2 as described above.

図15は、試料台外周カバーを分割して構成した例を示す図である。図に示すように、試料台外周カバー3は上部試料台外周カバー3a、下部試料台外周カバー3bに分割され、上部試料台外周カバー3a内に加熱機構4を配置し、上部および下部試料台外周カバーの接合部に冷却機構5を構成する溝を配置する。   FIG. 15 is a diagram showing an example in which the sample table outer periphery cover is divided. As shown in the figure, the sample table outer cover 3 is divided into an upper sample table outer cover 3a and a lower sample table outer cover 3b, and a heating mechanism 4 is arranged in the upper sample table outer cover 3a, and the upper and lower sample table outer covers 3a. A groove constituting the cooling mechanism 5 is disposed in the joint portion of the cover.

上部試料台外周カバー3aと下部試料台外周カバー3bの間に形成された冷却機構5を構成する溝はOリング17およびネジ16によってシールされている。加熱機構4は上部試料台外周カバー3aまたは下部試料台外周カバー3bのいずれかに埋設することができる。   A groove constituting the cooling mechanism 5 formed between the upper sample stage outer cover 3 a and the lower sample table outer cover 3 b is sealed by an O-ring 17 and a screw 16. The heating mechanism 4 can be embedded in either the upper sample stage outer cover 3a or the lower sample stage outer cover 3b.

以上説明したように、本発明の実施形態によれば、試料台外周カバーの温度を試料の温度と独立して調整でき、かつ所望の設定温度へ高速に調節でき、その設定温度で安定させることができる。これにより、ウエハ処理中における各ステップに最適なラジカル分布を実現することができるため、ウエハ上の微細パターンの加工において、その面内分布を試料の中央部から外周部にいたるまで均一化できる。さらに難エッチング性材料の加工あるいはプラズマクリーニング処理に求められる高温雰囲気中にておいも、同様の効果を得ることができる。このため処理チャンバのクリーニング処理の短縮化を図り、生産性を向上することができ、難エッチング材料の堆積物のクリーニングも可能となる。   As described above, according to the embodiment of the present invention, the temperature of the sample table outer periphery cover can be adjusted independently of the temperature of the sample, and can be adjusted to a desired set temperature at high speed, and stabilized at the set temperature. Can do. As a result, an optimal radical distribution for each step during wafer processing can be realized, so that in-plane distribution can be made uniform from the center to the outer periphery of the sample in processing a fine pattern on the wafer. Furthermore, the same effect can be obtained even in a high temperature atmosphere required for processing difficult-to-etch materials or plasma cleaning. Therefore, the cleaning process of the processing chamber can be shortened, the productivity can be improved, and the deposit of the difficult-to-etch material can be cleaned.

第1の実施形態にかかるプラズマ処理装置を説明する図である。It is a figure explaining the plasma processing apparatus concerning 1st Embodiment. ラジカル分布の変化とCD値の変化の概要を示す図である。It is a figure which shows the outline | summary of the change of radical distribution, and the change of CD value. ラジカル分布の変化とCD値の変化の概要を示す図である。It is a figure which shows the outline | summary of the change of radical distribution, and the change of CD value. 加熱機構としてヒータを用い、冷却機構として冷媒用流路を用いた場合の試料処理中における各部の温度変化を示した図である。It is the figure which showed the temperature change of each part in a sample process at the time of using a heater for a heating mechanism and using the flow path for refrigerant | coolants as a cooling mechanism. 加熱機構としてヒータを用い、冷却機構として冷媒用流路を用いた場合の試料処理中における各部の温度変化を示した図である。It is the figure which showed the temperature change of each part in a sample process at the time of using a heater for a heating mechanism and using the flow path for refrigerant | coolants as a cooling mechanism. 加熱機構としてヒータを用い、冷却機構として冷媒用流路を用いた場合の試料処理中における各部の温度変化を示した図である。It is the figure which showed the temperature change of each part in a sample process at the time of using a heater for a heating mechanism and using the flow path for refrigerant | coolants as a cooling mechanism. 加熱機構としてヒータを用い、冷却機構として冷媒用流路を用いた場合の試料処理中における各部の温度変化を示した図である。It is the figure which showed the temperature change of each part in a sample process at the time of using a heater for a heating mechanism and using the flow path for refrigerant | coolants as a cooling mechanism. 他の実施形態を示す図である。It is a figure which shows other embodiment. 他の実施形態を示す図である。It is a figure which shows other embodiment. 他の実施形態を示す図である。It is a figure which shows other embodiment. 他の実施形態を示す図である。It is a figure which shows other embodiment. 他の実施形態を示す図である。It is a figure which shows other embodiment. 他の実施形態を示す図である。It is a figure which shows other embodiment. 他の実施形態を示す図である。It is a figure which shows other embodiment. 他の実施形態を示す図である。It is a figure which shows other embodiment.

符号の説明Explanation of symbols

1 試料台
2 試料
3 試料台外周カバー
3a 上部試料台外周カバー
3b 下部試料台外周カバー
4 加熱機構
5 冷却機構
6 冷却機構用配管
7 複数の加熱機構
8 複数の冷却機構
9 試料台外周カバー用静電チャック電極
10 処理室壁
12 シールド
13 絶縁部材
14 加熱機構
15 冷却機構
16 ネジ
17 Oリング
DESCRIPTION OF SYMBOLS 1 Sample stand 2 Sample 3 Sample stand outer periphery cover 3a Upper sample stand outer periphery cover 3b Lower sample stand outer periphery cover 4 Heating mechanism 5 Cooling mechanism 6 Cooling mechanism piping 7 Multiple heating mechanisms 8 Multiple cooling mechanisms 9 Sample stand outer cover static Electric chuck electrode 10 Processing chamber wall 12 Shield 13 Insulating member 14 Heating mechanism 15 Cooling mechanism 16 Screw 17 O-ring

Claims (3)

真空処理室と、該真空処理室内に配置された試料台と、前記真空処理室に処理ガスを導入するガス導入手段を備え、前記真空処理室内に高周波電力を供給してプラズマを生成し、生成したプラズマにより前記試料台上に配置した試料にプラズマ処理を施すプラズマ処理装置において、
前記試料台は、載置する試料よりも大径の試料台基台部と該試料台基台部上に所定高さ突出して形成した前記試料よりも小径の試料載置部と、
前記試料台基台部上に突出して形成された試料載置部の外周および前記試料台基台部の外周をリング状に被覆する外周カバーを備え、
前記外周カバーの前記試料載置部の外周部分には、外周カバーを冷却するための冷却機構および外周カバーを加熱するための加熱機構を備えるとともに上下に分割され、前記上下に分割された一方の部分には前記加熱機構を備え、前記上下に分割された他方の部分には前記冷却機構を備えることを特徴とするプラズマ処理装置。
A vacuum processing chamber, a sample stage arranged in the vacuum processing chamber, and a gas introducing means for introducing a processing gas into the vacuum processing chamber, and generating high-frequency power into the vacuum processing chamber to generate plasma In a plasma processing apparatus for performing plasma processing on a sample placed on the sample stage by the plasma that has been performed,
The sample stage includes a sample stage base part having a diameter larger than that of the sample to be placed, and a sample placing part having a diameter smaller than that of the sample formed by protruding a predetermined height on the sample stage base part,
An outer periphery cover for covering the outer periphery of the sample mounting portion and the outer periphery of the sample base base portion formed in a ring shape projecting on the sample base base portion;
The outer peripheral portion of the outer peripheral cover is provided with a cooling mechanism for cooling the outer peripheral cover and a heating mechanism for heating the outer peripheral cover, and is divided into upper and lower parts, and one of the divided upper and lower parts. The plasma processing apparatus is characterized in that the portion includes the heating mechanism, and the other portion divided in the vertical direction includes the cooling mechanism.
請求項1に記載のプラズマ処理装置において、
前記加熱機構は、ヒータであり、
前記冷却機構は、冷媒流路を有し、
前記上下に分割された一方の部分は、前記上下に分割された上方の部分であり、
前記上下に分割された他方の部分は、さらに前記上方の部分を静電吸着するための電極を備えることを特徴とするプラズマ処理装置。
The plasma processing apparatus according to claim 1,
The heating mechanism is a heater,
The cooling mechanism has a refrigerant flow path,
The one part divided into the upper and lower parts is the upper part divided into the upper and lower parts,
The other part divided | segmented into the said upper and lower side is further equipped with the electrode for electrostatically adsorbing the said upper part, The plasma processing apparatus characterized by the above-mentioned.
請求項1に記載のプラズマ処理装置において、
前記加熱機構は、ヒータであり、
前記冷却機構は、冷媒流路を有し、
前記上下に分割された一方の部分は、前記上下に分割された上方の部分であるとともに前記上下に分割された下方の部分との接合部に前記冷媒流路を備えることを特徴とするプラズマ処理装置。
The plasma processing apparatus according to claim 1,
The heating mechanism is a heater,
The cooling mechanism has a refrigerant flow path,
The one part divided into the upper and lower parts is the upper part divided into the upper and lower parts, and the coolant flow path is provided at the junction with the lower part divided into the upper and lower parts. apparatus.
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