JPH09153481A - Apparatus for plasma processing - Google Patents
Apparatus for plasma processingInfo
- Publication number
- JPH09153481A JPH09153481A JP7312697A JP31269795A JPH09153481A JP H09153481 A JPH09153481 A JP H09153481A JP 7312697 A JP7312697 A JP 7312697A JP 31269795 A JP31269795 A JP 31269795A JP H09153481 A JPH09153481 A JP H09153481A
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- Prior art keywords
- separation plate
- plasma
- partition
- expansion
- processing apparatus
- Prior art date
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- Drying Of Semiconductors (AREA)
- Plasma Technology (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、半導体素子基板や
液晶ディスプレイ用ガラス基板等にプラズマを利用して
エッチング、アッシングおよびＣＶＤ等の処理を施すの
に適したプラズマ処理装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma processing apparatus suitable for performing processes such as etching, ashing, and CVD using a plasma on a semiconductor element substrate or a glass substrate for a liquid crystal display.
【０００２】[0002]
【従来の技術】ガスに外部からエネルギーを与えて発生
させたプラズマは、大規模集積回路（ＬＳＩ）や液晶デ
ィスプレイ（ＬＣＤ）等の製造プロセスにおいて広く用
いられている。特にプラズマを用いたエッチング方法や
アッシング方法はこれらの製造プロセスにとって不可欠
の基本技術となっている。2. Description of the Related Art Plasma generated by externally applying energy to gas is widely used in manufacturing processes of large scale integrated circuits (LSI), liquid crystal displays (LCD) and the like. Particularly, an etching method and an ashing method using plasma are essential basic techniques for these manufacturing processes.
【０００３】このエッチング方法やアッシング方法にお
いて、イオン衝撃による基板へのダメージが問題になる
場合がある。また、エッチング方法においては下地膜に
対する高選択比が要求される場合がある。In this etching method or ashing method, damage to the substrate due to ion bombardment may become a problem. In some cases, the etching method requires a high selectivity to the underlying film.
【０００４】そのような場合、ダウンフロー型のエッチ
ング方法やアッシング方法が用いられる。ダウンフロー
型とは、プラズマ室で発生させたプラズマから基板の処
理に必要なラディカルやイオンを選択的に反応室に引き
出して基板に照射するものである。例えば、この分離板
でイオンをカットしてラディカルのみを反応室に引き出
すことにより、イオン衝撃による基板へのダメージのな
いエッチングやアッシング、または下地膜に対する高選
択比のエッチングを行うことができる。In such a case, a downflow type etching method or an ashing method is used. The down-flow type selectively draws radicals and ions necessary for processing a substrate from plasma generated in a plasma chamber into a reaction chamber and irradiates the substrate with the radicals and ions. For example, by cutting ions with this separating plate and extracting only the radical into the reaction chamber, it is possible to perform etching or ashing without damaging the substrate due to ion bombardment, or etching with a high selectivity to the underlying film.
【０００５】図５は、このダウンフロー型のプラズマ処
理装置を示す模式的縦断面図である。このプラズマ処理
装置では、反応容器１内がアルミニウム（Ａｌ）等で作
製された分離板５によってプラズマ室２と反応室３とに
分けられている。この分離板５にはプラズマ引出孔５ｅ
が設けられており、プラズマ室２で発生したプラズマか
ら試料の処理に必要なラディカルやイオンを選択的に反
応室３に引き出せるようになっている。このとき、この
分離板５を接地する、プラズマ引出孔５ｅの大きさを変
える、または分離板５の厚みを厚くするなどにより、プ
ラズマの引き出し条件を変えることができる。図５に示
したプラズマ処理装置では、分離板５を反応容器１を介
して接地している。そうすることにより、プラズマ引出
孔５ｅを十分に小さくすれば、イオンを分離板５で消滅
させてラディカルのみを反応室３に引き出すことができ
る。FIG. 5 is a schematic longitudinal sectional view showing this down-flow type plasma processing apparatus. In this plasma processing apparatus, the inside of the reaction container 1 is divided into a plasma chamber 2 and a reaction chamber 3 by a separation plate 5 made of aluminum (Al) or the like. The separation plate 5 has a plasma extraction hole 5e.
Is provided so that radicals and ions necessary for processing a sample can be selectively extracted from the plasma generated in the plasma chamber 2 into the reaction chamber 3. At this time, the plasma extraction conditions can be changed by grounding the separation plate 5, changing the size of the plasma extraction hole 5e, or increasing the thickness of the separation plate 5. In the plasma processing apparatus shown in FIG. 5, the separation plate 5 is grounded via the reaction container 1. By doing so, if the plasma extraction hole 5e is made sufficiently small, the ions can be eliminated by the separation plate 5 and only the radical can be extracted into the reaction chamber 3.
【０００６】このプラズマ処理装置では、テフロン（登
録商標）等で作製された誘電体層２１にマイクロ波を伝
搬させ、誘電体層２１に対向する石英（ＳｉＯ2 ）等で
作製されたマイクロ波導入窓４からプラズマ室２内にマ
イクロ波を導入して、プラズマを発生する。発生したプ
ラズマは分離板５のプラズマ引出孔５ｅから反応室３内
に引き出される。そして、試料台１４上の基板Ｓに照射
して、所望のエッチングやアッシング処理を施すのであ
る。In this plasma processing apparatus, microwaves are propagated through the dielectric layer 21 made of Teflon (registered trademark) or the like, and microwaves made of quartz (SiO 2 ) or the like facing the dielectric layer 21 are introduced. A microwave is introduced into the plasma chamber 2 through the window 4 to generate plasma. The generated plasma is drawn into the reaction chamber 3 through the plasma drawing hole 5e of the separation plate 5. Then, the substrate S on the sample table 14 is irradiated with the desired etching or ashing process.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、上述の
プラズマ処理装置においては、プラズマを発生させると
分離板の温度がプラズマ加熱によって上昇する、またプ
ラズマの発生を停止すると、分離板の温度が下降する。
この温度上昇および温度下降よって分離板が伸縮し分離
板の外周部にある分離板を固定している部分に摩擦が生
じて、金属の微粒子、すなわちパーティクルが発生する
という問題が生じていた。このパーティクルが試料台上
の基板に堆積すると、この基板に形成されるデバイスの
絶縁不良等の原因になる。However, in the above-described plasma processing apparatus, when plasma is generated, the temperature of the separation plate rises due to plasma heating, and when plasma generation is stopped, the temperature of the separation plate falls. .
Due to the temperature increase and the temperature decrease, the separation plate expands and contracts, and friction occurs in the outer peripheral portion of the separation plate to which the separation plate is fixed, resulting in the generation of metal fine particles, that is, particles. When these particles are deposited on the substrate on the sample table, they may cause defective insulation of devices formed on the substrate.
【０００８】図６は、このプラズマ処理装置の分離板の
固定部を示す模式的縦断面図であるり、（ａ）は常温の
状態であり、（ｂ）はプラズマ加熱により分離板が伸長
した状態である。なお、（ａ）はネジで固定されている
部分の図であり、（ｂ）はネジとネジとの間であってネ
ジで固定されていない部分の図である。FIG. 6 is a schematic vertical sectional view showing a fixing portion of a separation plate of this plasma processing apparatus. (A) shows a room temperature condition, and (b) shows the separation plate elongated by plasma heating. It is in a state. Note that (a) is a view of a portion fixed with screws, and (b) is a view of a portion between the screws and not fixed with the screws.
【０００９】分離板５はプラズマ引出孔５ｅが設けられ
た分離板本体５ａとその外周部にある分離板固定部５ｃ
とからなる。分離板５は、分離板固定部５ｃにおいて反
応容器１の分離板保持部６に数本のアルミニウム製のネ
ジ７で固定される（図６（ａ））。分離板本体５ａがプ
ラズマ加熱により伸長すると、ネジ７で固定されていな
い部分では、分離板固定部５ｃが外側に移動するため、
分離板固定部５ｃと分離板保持部６との間で摩擦が生
じ、パーティクルが発生するのである（図６（ｂ））。The separation plate 5 includes a separation plate body 5a having a plasma extraction hole 5e and a separation plate fixing portion 5c on the outer periphery thereof.
Consists of The separation plate 5 is fixed to the separation plate holding portion 6 of the reaction vessel 1 at the separation plate fixing portion 5c with several screws 7 made of aluminum (FIG. 6A). When the separation plate main body 5a is expanded by plasma heating, the separation plate fixing portion 5c moves to the outside in the portion not fixed by the screw 7,
Friction occurs between the separation plate fixing portion 5c and the separation plate holding portion 6 to generate particles (FIG. 6 (b)).
【００１０】本発明はこのような課題に鑑みてなされた
ものであり、分離板の熱膨張に起因するパーティクルの
発生を抑えて、基板上に形成するデバイスの絶縁不良等
の発生を抑制できるプラズマ処理装置を提供することを
目的としている。The present invention has been made in view of the above problems, and it is possible to suppress the generation of particles due to the thermal expansion of the separation plate, and to suppress the generation of defective insulation of the device formed on the substrate. It is intended to provide a processing device.
【００１１】[0011]
【課題を解決するための手段】本発明者は、分離板本体
の伸縮が分離板の固定部に及ばないようにする方法につ
いて検討し、本発明を完成させた。Means for Solving the Problems The present inventor has studied the method for preventing the expansion and contraction of the separation plate main body from reaching the fixed portion of the separation plate, and completed the present invention.
【００１２】すなわち、本発明のプラズマ処理装置は、
プラズマを発生するプラズマ室と、内部に試料台が配設
された反応室と、プラズマ室で発生したプラズマから試
料の処理に必要な成分を選択的に反応室に引き出す分離
板とを備えるプラズマ処理装置であって、前記分離板の
熱膨張による平面的な伸縮を吸収する構造を有すること
を特徴としている。That is, the plasma processing apparatus of the present invention is
Plasma processing including a plasma chamber for generating plasma, a reaction chamber in which a sample stage is arranged, and a separation plate for selectively extracting components necessary for sample processing from the plasma generated in the plasma chamber to the reaction chamber The device is characterized by having a structure for absorbing planar expansion and contraction due to thermal expansion of the separation plate.
【００１３】本発明のプラズマ処理装置は、分離板の熱
膨張による平面的な伸縮を吸収する構造を有しているの
で、分離板本体がプラズマ加熱等により伸縮したとして
も、この伸縮が分離板の固定部に及ばない。したがっ
て、分離板の固定部が移動しないので、分離板の固定部
と分離板保持部との間での摩擦は生じない。したがっ
て、この部分でパーティクルは発生しない。Since the plasma processing apparatus of the present invention has a structure that absorbs the planar expansion and contraction due to the thermal expansion of the separation plate, even if the separation plate body expands or contracts due to plasma heating or the like, this expansion or contraction causes the separation plate to expand or contract. It does not reach the fixed part of. Therefore, since the fixed portion of the separation plate does not move, friction does not occur between the fixed portion of the separation plate and the separation plate holding portion. Therefore, no particles are generated in this part.
【００１４】また、分離板の固定部が移動しないので、
分離板の分離板保持部へのネジでの取り付けを安定させ
ることができる。そのため、分離板によりイオンをカッ
トしたり、プラズマの安定化させるために分離板を接地
する場合に、分離板を反応容器を介して安定して接地す
ることが可能になる。Further, since the fixing portion of the separating plate does not move,
It is possible to stabilize the attachment of the separation plate to the separation plate holding portion with a screw. Therefore, when the separation plate is used to cut ions or to ground the separation plate to stabilize the plasma, the separation plate can be stably grounded via the reaction vessel.
【００１５】分離板の熱膨張による平面的な伸縮を吸収
する構造としては、例えば、分離板の外周部に屈曲部を
設ける構造がある。この屈曲部が曲がることで、分離板
の平面的な伸縮を吸収できる。また、分離板の外周部に
伸縮緩和溝を設ける構造としても良い。この伸縮緩和溝
の幅が変化することで、分離板の平面的な伸縮を吸収で
きる。As a structure for absorbing the planar expansion and contraction of the separating plate due to thermal expansion, for example, there is a structure in which a bent portion is provided on the outer peripheral portion of the separating plate. By bending this bent portion, the planar expansion and contraction of the separation plate can be absorbed. Further, a structure in which expansion / contraction relaxation grooves are provided on the outer peripheral portion of the separation plate may be adopted. By changing the width of the expansion / contraction relaxation groove, the planar expansion / contraction of the separation plate can be absorbed.
【００１６】[0016]
【発明の実施の形態】本発明の熱膨張による平面的な伸
縮を吸収する構造を有する分離板を備えたプラズマ処理
装置の１例について図面に基づき説明する。BEST MODE FOR CARRYING OUT THE INVENTION An example of a plasma processing apparatus having a separating plate having a structure for absorbing planar expansion and contraction due to thermal expansion of the present invention will be described with reference to the drawings.
【００１７】図１は、本発明のプラズマ処理装置の１例
を示す模式的縦断面図である。FIG. 1 is a schematic vertical sectional view showing an example of the plasma processing apparatus of the present invention.
【００１８】反応容器１は分離板５によってプラズマ室
２と反応室３とに分離され、またその分離板５に設けら
れたプラズマ引出孔５ｅによりプラズマ室２と反応室３
により連通している。分離板５はその外周部に断面がク
ランク状である折れ曲がりを有しており、その先の部分
で、分離板保持部６に固定されている。分離板５は反応
容器１を介して接地されている。分離板５は通常コンタ
ミネーションの問題からアルミニウム（Ａｌ）等の金属
が用いられる。The reaction vessel 1 is separated into a plasma chamber 2 and a reaction chamber 3 by a separation plate 5, and a plasma extraction hole 5e provided in the separation plate 5 separates the plasma chamber 2 and the reaction chamber 3 from each other.
Is communicated with. The separating plate 5 has a bent portion having a crank-shaped cross section on its outer peripheral portion, and is fixed to the separating plate holding portion 6 at the tip portion thereof. The separation plate 5 is grounded via the reaction container 1. The separation plate 5 is usually made of a metal such as aluminum (Al) due to the problem of contamination.
【００１９】反応容器１はアルミニウム（Ａｌ）等の金
属で作製され、その反応容器１の壁の内部には冷却水経
路１５が形成される。反応容器１の上部はマイクロ波導
入窓４で気密に封止される。マイクロ波導入窓４は、耐
熱性とマイクロ波透過性を有し、かつ誘電損失が小さい
石英（ＳｉＯ2 ）、アルミナ（Ａｌ2 Ｏ3 ）等の誘電体
板で作製される。反応室３内にはマイクロ波導入窓４と
は対向する位置に、基板Ｓを載置する試料台１４が配設
される。反応容器１の側壁にはプラズマ室２にガスを供
給するガス導入孔１２が設けられ、反応容器１の下部壁
には排気装置（図示せず）に接続される排気口１３が設
けられている。誘電体層２１に導波管２３を介してマイ
クロ波発振器２４が連結されている。The reaction vessel 1 is made of a metal such as aluminum (Al), and a cooling water passage 15 is formed inside the wall of the reaction vessel 1. The upper part of the reaction vessel 1 is hermetically sealed by the microwave introduction window 4. The microwave introduction window 4 is made of a dielectric plate such as quartz (SiO 2 ), alumina (Al 2 O 3 ), which has heat resistance and microwave transparency and has a small dielectric loss. A sample stage 14 on which the substrate S is placed is disposed in the reaction chamber 3 at a position facing the microwave introduction window 4. A gas introduction hole 12 for supplying a gas to the plasma chamber 2 is provided on the side wall of the reaction vessel 1, and an exhaust port 13 connected to an exhaust device (not shown) is provided on the lower wall of the reaction vessel 1. . A microwave oscillator 24 is connected to the dielectric layer 21 via a waveguide 23.
【００２０】図２は、このプラズマ処理装置の分離板の
固定部の模式的縦断面図であり、（ａ）は常温の状態で
あり、（ｂ）はプラズマ加熱により分離板が伸長した状
態である。FIG. 2 is a schematic vertical sectional view of a fixed portion of a separation plate of this plasma processing apparatus. (A) shows a room temperature state, and (b) shows a state where the separation plate is extended by plasma heating. is there.
【００２１】分離板５は、プラズマ引出孔５ｅが設けら
れている分離板本体５ａとその外周部にある分離板屈曲
部５ｂと分離板固定部５ｃとからなる。分離板５は、分
離板固定部５ｃにおいて反応容器１の分離板保持部６に
アルミニウム（Ａｌ）等の金属製の数本のネジ７で固定
される（図２（ａ））。分離板本体５ａがプラズマ加熱
により伸長すると、分離板屈曲部５ｂが曲がってこの伸
びを吸収する。そのため、分離板固定部５ｃは動かず、
分離板保持部６との間で摩擦も生じないためパーティク
ルが発生しない（図２（ｂ））。The separating plate 5 comprises a separating plate body 5a having a plasma drawing hole 5e, a separating plate bent portion 5b and a separating plate fixing portion 5c on the outer periphery thereof. The separation plate 5 is fixed to the separation plate holding portion 6 of the reaction container 1 in the separation plate fixing portion 5c with several screws 7 made of metal such as aluminum (Al) (FIG. 2A). When the separation plate body 5a is expanded by plasma heating, the separation plate bent portion 5b is bent and absorbs the expansion. Therefore, the separation plate fixing portion 5c does not move,
No friction is generated between the separation plate holder 6 and particles are not generated (FIG. 2B).
【００２２】分離板本体５ａの平面形状はほぼ矩形であ
り、その矩形の角は所定の曲率のアール面取り形状に形
成した方が良い。これは、分離板本体５ａがプラズマ加
熱により伸長したとき、分離板屈曲部５ｂを曲がりやす
くして、この伸びを吸収しやすくするためである。な
お、分離板本体５ａの平面形状が円形等であっても良い
ことは言うまでもない。The plane shape of the separating plate body 5a is substantially rectangular, and the corners of the rectangle are preferably chamfered with a predetermined curvature. This is because when the separation plate body 5a is expanded by plasma heating, the separation plate bent portion 5b is easily bent, and this expansion is easily absorbed. It goes without saying that the plane shape of the separation plate body 5a may be circular or the like.
【００２３】分離板屈曲部５ｂの厚みを薄くすれば、分
離板屈曲部５ｂをより曲がり易くして伸びを吸収しやす
くできる。If the thickness of the bent portion 5b of the separating plate is reduced, the bent portion 5b of the separating plate can be bent more easily and the elongation can be absorbed more easily.
【００２４】なお、ネジ固定部８はアルミニウム（Ａ
ｌ）等で矩形リング状に作製されたものであり、反応容
器１の側壁のガス導入孔１２から導入されるガスをプラ
ズマ室２に速やかに供給する経路を形成するためのもの
である。The screw fixing portion 8 is made of aluminum (A
1) or the like, which is formed in a rectangular ring shape, and is for forming a path for rapidly supplying the gas introduced from the gas introduction hole 12 on the side wall of the reaction vessel 1 to the plasma chamber 2.
【００２５】図３は、本発明のプラズマ処理装置の別の
例の分離板の固定部の模式的縦断面図であり、（ａ）は
常温の状態であり、（ｂ）はプラズマ加熱により分離板
が伸長した状態である。FIG. 3 is a schematic vertical sectional view of a fixed part of a separation plate of another example of the plasma processing apparatus of the present invention. (A) is a room temperature state and (b) is separated by plasma heating. The plate is in a stretched state.
【００２６】分離板５は、プラズマ引出孔５ｅが設けら
れた分離板本体５ａとその外周部にある分離板固定部５
ｃとからなる。ただし、分離板本体５ａの外周に伸縮緩
和溝５ｄが設けられている。分離板５は、分離板固定部
５ｃにおいて反応容器の分離板保持部６にアルミニウム
（Ａｌ）等の金属製の数本のネジ７で固定される（図３
（ａ））。分離板本体５ａがプラズマ加熱により伸長す
ると、伸縮緩和溝５ｄの溝の幅が狭くなってこの伸びを
吸収する。そのため、分離板固定部５ｃは動かず、分離
板保持部６との間で摩擦も生じないためパーティクルが
発生しない（図３（ｂ））。The separation plate 5 is composed of a separation plate body 5a having a plasma extraction hole 5e and a separation plate fixing portion 5 on the outer periphery thereof.
c. However, the expansion / contraction relaxation groove 5d is provided on the outer periphery of the separation plate body 5a. The separation plate 5 is fixed to the separation plate holding portion 6 of the reaction container in the separation plate fixing portion 5c with several screws 7 made of metal such as aluminum (Al) (FIG. 3).
(A)). When the separation plate main body 5a is expanded by plasma heating, the width of the expansion / contraction relaxation groove 5d is narrowed to absorb the expansion. Therefore, the separation plate fixing portion 5c does not move and friction does not occur between the separation plate holding portion 6 and particles, so that particles are not generated (FIG. 3B).
【００２７】上述した分離板屈曲部５ｂや伸縮緩和溝５
ｄの設計は、分離板５の熱膨張の程度を評価して行えば
良い。この評価には、例えば以下の熱膨張の式（式
（１））を用いれば良い。The bent portion 5b of the separating plate and the expansion / contraction relaxation groove 5 described above.
The design of d may be performed by evaluating the degree of thermal expansion of the separation plate 5. For this evaluation, for example, the following thermal expansion formula (Formula (1)) may be used.
【００２８】 Ｌ＝ａＬ0 （Ｔ2 −Ｔ1 ） ・・・・・ （１） ａ ：線膨張係数 例えば、Ａｌの場合：２．３×１０-5（Ｋ-1） Ｌ0 ：０℃での金属の長さ Ｔ2 −Ｔ1 ：温度差（Ｋ） なお、本発明は、誘電体層を用いたプラズマ処理装置の
みならず、分離板を用いたプラズマ処理装置のすべてに
適用することができる。L = aL 0 (T 2 −T 1 ) (1) a: linear expansion coefficient For example, in the case of Al: 2.3 × 10 −5 (K −1 ) L 0 : 0 ° C. Length of metal T 2 −T 1 : temperature difference (K) The present invention is applicable not only to the plasma processing apparatus using the dielectric layer but also to all the plasma processing apparatus using the separating plate. You can
【００２９】[0029]
【実施例】本発明の実施例について説明する。本発明の
実施例は図１及び図２に示したものである。すなわち、
この実施例の分離板５は、分離板屈曲部５ｂにより分離
板本体５ａの平面的な伸縮を吸収するものである。この
実施例の装置は、ＬＣＤ用ガラス基板等の大型基板を処
理するものであり、プラズマ発生面積が６５０ｍｍ×６
５０ｍｍとした。An embodiment of the present invention will be described. The embodiment of the present invention is shown in FIGS. That is,
The separating plate 5 of this embodiment absorbs the planar expansion and contraction of the separating plate body 5a by the separating plate bent portion 5b. The apparatus of this embodiment is for processing a large substrate such as a glass substrate for LCD and has a plasma generation area of 650 mm × 6.
It was set to 50 mm.
【００３０】分離板５はアルミニウム（Ａｌ）で作製し
た。分離板本体５ａの厚みは２．０ｍｍとし、面積は６
００ｍｍ×６００ｍｍとし、角に対しては曲率半径３０
ｍｍのアール面取りを施してある。プラズマ引出孔は、
直径３ｍｍのものを５ｍｍの間隔で１１０×１１０個設
けた。The separating plate 5 was made of aluminum (Al). The separation plate body 5a has a thickness of 2.0 mm and an area of 6 mm.
00mm x 600mm, radius of curvature 30 for each corner
mm chamfered. The plasma extraction hole is
110 × 110 pieces having a diameter of 3 mm were provided at intervals of 5 mm.
【００３１】分離板屈曲部５ｂの厚みは１．５ｍｍと
し、長さは３０ｍｍとした。また分離板屈曲部５ｂと後
述するネジ固定部８との間隔ｄを３．０ｍｍとした。分
離板屈曲部５ｂの厚みは分離板本体５ａの厚みに比べて
薄くなるように決めた。分離板屈曲部５ｂの長さ及び分
離板屈曲部５ｂとネジ固定部８との間隔ｄは、プラズマ
加熱による分離板本体５ａの伸びの評価に基づき決め
た。The separating plate bent portion 5b had a thickness of 1.5 mm and a length of 30 mm. The distance d between the separating plate bent portion 5b and the screw fixing portion 8 described later was set to 3.0 mm. The thickness of the separation plate bent portion 5b was determined to be thinner than the thickness of the separation plate main body 5a. The length of the separation plate bent portion 5b and the distance d between the separation plate bent portion 5b and the screw fixing portion 8 were determined based on the evaluation of the elongation of the separation plate main body 5a due to plasma heating.
【００３２】この実施例では、通常のエッチングやアッ
シング処理の際、プラズマ加熱により分離板５が２００
℃程度に加熱される。分離板本体５ａの横方向の伸びを
式（１）により評価し、通常の処理においては常温（２
５℃）に比べ横方向に２．４ｍｍ（片側１．２ｍｍず
つ）伸びることがわかった。この伸びの値に基づき、分
離板屈曲部５ｂの長さ及び分離板屈曲部５ｂとネジ固定
部８との間隔ｄを決めたのである。In this embodiment, during the usual etching or ashing process, the separation plate 5 is heated to 200 by plasma heating.
It is heated to about ℃. The lateral extension of the separation plate body 5a was evaluated by the formula (1), and in normal processing, the room temperature (2
It was found that the film stretched in the lateral direction by 2.4 mm (1.2 mm on each side) as compared with 5 ° C. Based on the value of this elongation, the length of the separating plate bent portion 5b and the distance d between the separating plate bent portion 5b and the screw fixing portion 8 were determined.
【００３３】また、分離板保持部６は、その材質がアル
ミニウム（Ａｌ）であり、反応容器１の内周に沿って設
けられている。分離板５は、この分離板保持部６にネジ
７で４８ケ所固定されている。ネジ固定部８は、アルミ
ニウム（Ａｌ）の矩形リング状のものである。ガス供給
孔１２は反応容器１の壁に４８ケ所設けた。分離板５は
反応容器１を介して接地されている。The separating plate holder 6 is made of aluminum (Al) and is provided along the inner circumference of the reaction vessel 1. The separating plate 5 is fixed to the separating plate holding portion 6 with screws 7 at 48 places. The screw fixing portion 8 has a rectangular ring shape made of aluminum (Al). The gas supply holes 12 were provided in 48 places on the wall of the reaction vessel 1. The separation plate 5 is grounded via the reaction container 1.
【００３４】この実施例の分離板の適用の効果を調べる
ために、反応室内におけるパーティクル（＞０．２μ
ｍ）数の評価を行った。評価は次のように行った。シリ
コンウエハＳを試料台１４上に載置してプラズマ照射を
行う工程を繰り返す。この工程の所定の枚数のところ
で、予めパーティクル数を測定したシリコンウエハＳを
試料台１４上に載置してプラズマ照射を行い、パーティ
クル数を測定し、パーティクル数の増加を求める。な
お、このプラズマ照射の工程は、シリコンウエハＳを交
換しながら２５枚連続で行い、さらにこれを１２回繰り
返して、計３００枚に対して行った。プラズマ照射時間
は２分、プラズマ照射の間隔は１分とした。プラズマ照
射の条件は、ガス：Ａｒ、圧力：０．３Ｔｏｒｒ、マイ
クロ波パワー：３．０ｋＷとした。また、比較のため、
図５および図６に示した従来の分離板を用いたプラズマ
処理装置についても同様の測定を行った。In order to investigate the effect of applying the separation plate of this embodiment, particles (> 0.2 μm) in the reaction chamber were examined.
m) The number was evaluated. The evaluation was performed as follows. The process of placing the silicon wafer S on the sample table 14 and performing plasma irradiation is repeated. At a predetermined number of particles in this step, the silicon wafer S whose number of particles has been measured in advance is placed on the sample table 14 and plasma irradiation is performed, the number of particles is measured, and the increase in the number of particles is obtained. Note that this plasma irradiation step was performed continuously for 25 wafers while exchanging the silicon wafer S, and this was repeated 12 times for a total of 300 wafers. The plasma irradiation time was 2 minutes, and the plasma irradiation interval was 1 minute. The plasma irradiation conditions were gas: Ar, pressure: 0.3 Torr, and microwave power: 3.0 kW. Also, for comparison,
The same measurement was performed for the plasma processing apparatus using the conventional separator shown in FIGS. 5 and 6.
【００３５】図４は、パーティクル数の測定結果であ
る。本発明の実施例（○）の場合、パーティクル数が２
０〜３０個前後で安定していた。これに対して、従来例
（△）の場合、約５０枚のプラズマ照射でパーティクル
数が増加し始め、パーティクル数が１００個程度まで増
加した。すなわち、本発明の分離板を適用することによ
って、パーティクル数の増加を抑えることができること
を確認した。FIG. 4 shows the measurement results of the number of particles. In the case of the embodiment of the present invention (○), the number of particles is 2
It was stable at around 0 to 30 pieces. On the other hand, in the case of the conventional example (Δ), the number of particles began to increase after about 50 plasma irradiations, and the number of particles increased to about 100. That is, it was confirmed that the increase in the number of particles can be suppressed by applying the separation plate of the present invention.
【００３６】[0036]
【発明の効果】以上詳述したように、本発明のプラズマ
処理装置にあっては、分離板の熱膨張による摩擦に起因
するパーティクルの発生を抑えることができる。これに
より、本発明のプラズマ処理装置を用いて製造されるデ
バイスの絶縁不良等を発生を抑制できる。As described above in detail, in the plasma processing apparatus of the present invention, generation of particles due to friction due to thermal expansion of the separation plate can be suppressed. As a result, it is possible to suppress the occurrence of insulation defects and the like in devices manufactured using the plasma processing apparatus of the present invention.
【図１】本発明のプラズマ処理装置の１例を示す模式的
縦断面図である。FIG. 1 is a schematic longitudinal sectional view showing one example of a plasma processing apparatus of the present invention.
【図２】本発明のプラズマ処理装置の１例の分離板の固
定部の模式的縦断面図であり、（ａ）は常温の状態であ
り、（ｂ）はプラズマ加熱により分離板が伸長した状態
である。FIG. 2 is a schematic vertical cross-sectional view of a fixed portion of a separation plate of an example of the plasma processing apparatus of the present invention, (a) is a room temperature state, and (b) is a separation plate elongated by plasma heating. It is in a state.
【図３】本発明のプラズマ処理装置の別の例の分離板の
固定部の模式的縦断面図であり、（ａ）は常温の状態で
あり、（ｂ）はプラズマ加熱により分離板が伸長した状
態である。FIG. 3 is a schematic vertical cross-sectional view of a fixed portion of a separation plate of another example of the plasma processing apparatus of the present invention, (a) is a room temperature state, and (b) is a separation plate expanded by plasma heating. It is in the state of having done.
【図４】パーティクル数の測定結果である。FIG. 4 is a measurement result of the number of particles.
【図５】従来のダウンフロー型のプラズマ処理装置を示
す模式的縦断面図である。FIG. 5 is a schematic vertical sectional view showing a conventional down flow type plasma processing apparatus.
【図６】従来のダウンフロー型のプラズマ処理装置の分
離板の固定部の模式的縦断面図であり、（ａ）は常温の
状態であり、（ｂ）はプラズマ加熱により分離板が伸長
した状態である。6A and 6B are schematic vertical cross-sectional views of a fixed portion of a separation plate of a conventional down-flow type plasma processing apparatus, where FIG. 6A shows a room temperature state and FIG. 6B shows the separation plate elongated by plasma heating. It is in a state.
１ 反応容器 ２ プラズマ室 ３ 反応室 ４ マイクロ波導入窓 ５ 分離板 ５ａ 分離板本体 ５ｂ 分離板屈曲部 ５ｃ 分離板固定部 ５ｄ 伸縮緩和溝 ５ｅ プラズマ引出孔 ６ 分離板保持部 ７ ネジ ８ ネジ固定部 １１ Ｏリング １２ ガス導入孔 １４ 試料台 １５ 冷却水経路 ２１ 誘電体層 ２２ 金属板 ２３ 導波管 ２４ マイクロ波発振器 Ｓ 基板（シリコンウエハ） DESCRIPTION OF SYMBOLS 1 Reaction container 2 Plasma chamber 3 Reaction chamber 4 Microwave introduction window 5 Separation plate 5a Separation plate body 5b Separation plate bent part 5c Separation plate fixing part 5d Expansion / contraction relaxation groove 5e Plasma extraction hole 6 Separation plate holding part 7 Screw 8 Screw fixing part 11 O-ring 12 Gas introduction hole 14 Sample stage 15 Cooling water path 21 Dielectric layer 22 Metal plate 23 Waveguide 24 Microwave oscillator S Substrate (silicon wafer)
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０５Ｈ 1/46 Ｈ０５Ｈ 1/46 Ｂ // Ｃ２３Ｃ 16/50 Ｃ２３Ｃ 16/50 Ｈ０１Ｌ 21/302 Ｈ (72)発明者 松本 直樹 大阪府大阪市中央区北浜４丁目５番33号住 友金属工業株式会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Office reference number FI technical display location H05H 1/46 H05H 1/46 B // C23C 16/50 C23C 16/50 H01L 21/302 H ( 72) Inventor Naoki Matsumoto 4-5-3 Kitahama, Chuo-ku, Osaka City, Osaka Prefecture Sumitomo Metal Industries, Ltd.
Claims (1)
試料台が配設された反応室と、プラズマ室で発生したプ
ラズマから試料の処理に必要な成分を選択的に反応室に
引き出す分離板とを備えるプラズマ処理装置であって、
前記分離板の熱膨張による平面的な伸縮を吸収する構造
を有することを特徴とするプラズマ処理装置。1. A plasma chamber for generating plasma, a reaction chamber in which a sample stage is arranged, and a separation plate for selectively drawing out components necessary for processing a sample from the plasma generated in the plasma chamber into the reaction chamber. A plasma processing apparatus comprising:
A plasma processing apparatus having a structure for absorbing planar expansion and contraction due to thermal expansion of the separation plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7312697A JPH09153481A (en) | 1995-11-30 | 1995-11-30 | Apparatus for plasma processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7312697A JPH09153481A (en) | 1995-11-30 | 1995-11-30 | Apparatus for plasma processing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09153481A true JPH09153481A (en) | 1997-06-10 |
Family
ID=18032347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7312697A Pending JPH09153481A (en) | 1995-11-30 | 1995-11-30 | Apparatus for plasma processing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09153481A (en) |
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