JPH05251400A - Ito dry etching method - Google Patents

Ito dry etching method

Info

Publication number
JPH05251400A
JPH05251400A JP5063192A JP5063192A JPH05251400A JP H05251400 A JPH05251400 A JP H05251400A JP 5063192 A JP5063192 A JP 5063192A JP 5063192 A JP5063192 A JP 5063192A JP H05251400 A JPH05251400 A JP H05251400A
Authority
JP
Japan
Prior art keywords
gas
etching
ito
flow rate
rate control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP5063192A
Other languages
Japanese (ja)
Inventor
Shigeki Oyagi
茂樹 大八木
Naoto Okazaki
尚登 岡崎
Seiichi Ogino
誠一 荻野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NISSHIN HIGHTECH KK
Original Assignee
NISSHIN HIGHTECH KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NISSHIN HIGHTECH KK filed Critical NISSHIN HIGHTECH KK
Priority to JP5063192A priority Critical patent/JPH05251400A/en
Publication of JPH05251400A publication Critical patent/JPH05251400A/en
Withdrawn legal-status Critical Current

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  • Electrodes Of Semiconductors (AREA)
  • Drying Of Semiconductors (AREA)

Abstract

PURPOSE:To minimize fluctuations in an etching rate irrespective of the film quality of ITO by dry-etching the ITO by means of plasma of gases including hydrogen iodide, an etching species and hydrogen gas as a reducing species. CONSTITUTION:A holder 2, which supports an ITO formed-work piece 8 is installed in a vacuum vessel 1. An etching gas intake section 3 for etching gas is installed in the upper part of the holder 2. The vacuum vessel 1 is drawn up to a specified degree of vacuum by means of an exhaust device 7. Then, a specified amount of HI gas is introduced from a gas cylinder 4 under the flow rate control of a flow rate control section 43. When H2 is used as a reducing gas, a specified amount of H2 is introduced into the vessel 1 under the flow rate control of a flow rate control section 53. When a specified high frequency voltage is applied to the workpiece 8 from a high frequency voltage application device 20 under the control of an etching temperature as specified, the HI gas and the reducing gas are ionized so that the ITO exposed on the workpiece 8 may be dry-etched.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、例えば液晶表示デバイ
スのための薄膜トランジスタ(TFT)をガラス基板上
に作成するにあたり形成したITO(Indium Tin Oxid
e) 膜をドライエッチングして透明電極を得る等に採用
できるITOのドライエッチング方法に関する。
BACKGROUND OF THE INVENTION The present invention relates to an ITO (Indium Tin Oxid) formed when a thin film transistor (TFT) for a liquid crystal display device is formed on a glass substrate.
e) The present invention relates to a dry etching method for ITO that can be used for dry etching a film to obtain a transparent electrode.

【0002】[0002]

【従来の技術】従来、ITOのエッチングにはエッチン
グ液によるウエットエッチングが採用されていたが、こ
のウエットエッチング法は、エッチングが等方的に行わ
れるため、得ようとするパターン乃至電極にいわゆるア
ンダーカットが発生したり、異常エッチングが発生する
など、様々の難点があることから、最近ではドライエッ
チングが注目されている。
2. Description of the Related Art Conventionally, wet etching using an etching solution has been employed for etching ITO. However, this wet etching method isotropic because the etching is carried out, and so-called under etching is applied to the pattern or electrode to be obtained. Recently, dry etching has attracted attention because it has various problems such as cutting and abnormal etching.

【0003】ITOのドライエッチングとして現在提案
されている代表的なものは、ヨウ化水素ガス(HI)を
用いる反応性イオンエッチング(RIE)と、メタンガ
ス(CH4 )及び水素ガス(H2 )を用いる反応性イオ
ンエッチング(RIE)である。このうちHIガスを用
いるRIE法では、RIE装置へのHIガスの導入によ
り、 In+3I→InI3 Sn+4I→SnI4 O+2H→H2 O の反応性を起こさせ、InI3 、SnI4 、H2 Oを蒸
散させることでエッチングを行う。
Representatives currently proposed as dry etching of ITO are reactive ion etching (RIE) using hydrogen iodide gas (HI) and methane gas (CH 4 ) and hydrogen gas (H 2 ). The reactive ion etching (RIE) used. Among them, in the RIE method using the HI gas, the introduction of the HI gas into the RIE device causes the reactivity of In + 3I → InI 3 Sn + 4I → SnI 4 O + 2H → H 2 O to be generated, and InI 3 , SnI 4 , and H 2 O are generated. Etching is performed by evaporating.

【0004】このHIガスを用いるRIE法は、メタン
ガス(CH4 )及び水素ガス(H2)を用いるRIE法
に比べ、エッチング速度が速いという利点がある。
The RIE method using HI gas has an advantage that the etching rate is faster than the RIE method using methane gas (CH 4 ) and hydrogen gas (H 2 ).

【0005】[0005]

【発明が解決しようとする課題】しかしながら、このよ
うなHIガスによるRIE法は、ITOの膜質によりエ
ッチング速度が大きく変動し、実用に供し難いという問
題がある。すなわち、ITOにおいてスズ(Sn)−酸
素(O)結合が偏析している部位では、エッチング速度
が低下するためと考えられる。
However, the RIE method using the HI gas has a problem that the etching rate varies greatly depending on the quality of the ITO film and it is difficult to put it to practical use. That is, it is considered that the etching rate decreases at the site where the tin (Sn) -oxygen (O) bond is segregated in ITO.

【0006】これは、Sn−O結合が偏析している部位
では、インジウム(In)によるヨウ素(I)の消費が
少なくなる一方、SnとIとの結合反応が進み、比較的
蒸気圧の低いSn−I結合物質が被エッチング面を覆
い、このためエッチングが進行し難くなることによると
考えられる。そこで本発明は、HIガスを用いるITO
のドライエッチング方法であって、ITOの膜質に拘ら
ず、エッチング速度の変動が少ない方法を提供すること
を課題とする。
[0006] This means that at the site where the Sn-O bond is segregated, the consumption of iodine (I) by indium (In) is reduced, while the bonding reaction between Sn and I proceeds, and the vapor pressure is relatively low. It is considered that the Sn-I binding substance covers the surface to be etched, which makes it difficult for the etching to proceed. Therefore, the present invention provides ITO using HI gas.
It is an object of the present invention to provide a dry etching method, which has a small fluctuation in etching rate regardless of the film quality of ITO.

【0007】[0007]

【課題を解決するための手段】本発明者は前記課題解決
に向け研究を重ねたところ、ヨウ化水素とともに水素ガ
スを用いれば、ITOにおけるスズ−酸素結合の分離を
促進させるとともにスズとヨウ素との結合を抑制してス
ズとヨウ素との結合物質より蒸気圧の高いスズ化合物を
生成させることができることを見出し、本発明を完成し
た。
Means for Solving the Problems The inventors of the present invention have conducted extensive research to solve the above problems. When hydrogen gas is used together with hydrogen iodide, the separation of tin-oxygen bond in ITO is promoted and tin and iodine are separated. The inventors have found that it is possible to generate a tin compound having a higher vapor pressure than that of a binding substance of tin and iodine by suppressing the binding of the compound (1) to complete the present invention.

【0008】すなわち本発明は、ヨウ化水素とエッチン
グ種及び還元種としての水素ガスとを含むガスのプラズ
マによりITOをドライエッチングすることを特徴とす
るITOのドライエッチング方法を提供するものであ
る。前記ヨウ化水素(HI)とエッチング種及び還元種
としての水素ガス(H2 )とを含むガスは水素ガス以外
の還元性ガスを含んでいてもよい。このような還元性ガ
スとしては、一酸化炭素(CO)、一二酸化窒素(N2
O)、二酸化窒素(NO2 )等が考えられる。
That is, the present invention provides a dry etching method for ITO, characterized in that the ITO is dry-etched by plasma of a gas containing hydrogen iodide and hydrogen gas as an etching species and a reducing species. The gas containing hydrogen iodide (HI) and hydrogen gas (H 2 ) as an etching species and a reducing species may contain a reducing gas other than hydrogen gas. Such reducing gases include carbon monoxide (CO), nitrogen monoxide (N 2
O), nitrogen dioxide (NO 2 ) and the like are considered.

【0009】エッチング時のITOの温度は80℃〜2
50℃程度に制御することが望ましい。80℃より低い
とエッチング反応が進行し難く、250℃以上ではIT
O上に通常設けられるパターン形成のためのレジスト膜
が耐えられなくなる。
The temperature of ITO during etching is 80 ° C. to 2
It is desirable to control the temperature to about 50 ° C. If the temperature is lower than 80 ° C, it is difficult for the etching reaction to proceed.
The resist film for forming a pattern, which is usually provided on O, cannot withstand.

【0010】[0010]

【作用】本発明ITOドライエッチング方法によると、
エッチング用ガスとしてHIガスと、H2 やCO等の還
元性ガスとを含むガスが採用され、該ガスがプラズマ化
され、このプラズマのもとでITOがドライエッチング
される。ITO中にSn−O結合が偏析する部位があっ
て、これがエッチング中に露出してきても、プラズマ化
された水素ガス、或いはプラズマ化された水素ガス及び
前記還元性ガスのため、Sn−Oが偏析する部位におい
てSn−O結合の分離が促進され、また、SnとHIか
ら発生するヨウ素(I)との結合が抑制されることで比
較的蒸気圧の低いSn−I結合物の生成が抑制される一
方、これより蒸気圧の高いスズ化合物が生成されること
で、エッチング速度の実用に供し難い低下乃至変動は避
けられる。
According to the ITO dry etching method of the present invention,
A gas containing a HI gas and a reducing gas such as H 2 or CO is adopted as an etching gas, the gas is turned into plasma, and the ITO is dry-etched under the plasma. Even if there is a site where the Sn—O bond is segregated in the ITO and it is exposed during etching, the Sn—O is converted to plasma hydrogen gas or plasma hydrogen gas and the reducing gas as described above. The separation of Sn-O bond is promoted at the segregated site, and the bond between Sn and iodine (I) generated from HI is suppressed, thereby suppressing the formation of Sn-I bond having a relatively low vapor pressure. On the other hand, by producing a tin compound having a higher vapor pressure than this, it is possible to avoid a decrease or fluctuation in the etching rate that is difficult to put to practical use.

【0011】[0011]

【実施例】以下、本発明の実施例を図面を参照して説明
する。図1は本発明方法の実施に使用する反応性イオン
エッチング装置(RIE装置)の概略構成を示してい
る。このRIE装置は、真空容器1を備えており、その
中にはITOを形成した被加工物8を支持するホルダ2
が設置され、該ホルダには高周波電圧印加装置20が接
続されている。ホルダ2には、被加工物のエッチング温
度を制御するためのヒータ21が付設されている。
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of a reactive ion etching apparatus (RIE apparatus) used for carrying out the method of the present invention. This RIE apparatus comprises a vacuum container 1 in which a holder 2 for supporting a work 8 having ITO formed therein is supported.
Is installed, and the high frequency voltage applying device 20 is connected to the holder. The holder 2 is provided with a heater 21 for controlling the etching temperature of the workpiece.

【0012】また、ホルダ2の上方にはエッチング用ガ
スの導入部3が設けられ、これには開閉弁41、42、
その間の流量制御部43を介してHIガスボンベ4が接
続され、開閉弁51、52、その間の流量制御部53を
介してH2 ガスボンベ5が接続され、さらに、開閉弁6
1、62、その間の流量制御部63を介してCOガスボ
ンベ6が接続されている。
Further, an etching gas introducing portion 3 is provided above the holder 2, and the opening / closing valves 41, 42,
The HI gas cylinder 4 is connected via the flow rate control unit 43 between them, the open / close valves 51 and 52, the H 2 gas cylinder 5 is connected via the flow rate control unit 53 between them, and the open / close valve 6
The CO gas cylinder 6 is connected via 1, 62 and a flow rate control unit 63 between them.

【0013】また、真空容器1には、この中を所定真空
度に排気するための排気装置7が接続されている。前記
RIE装置によると、先ずホルダ2上に、レジスト膜に
より所定パターンが描かれたITOを有する被加工物8
が設置され、しかるのち真空容器1が排気装置7にて所
定真空度まで真空引き開始され、次いで弁41、42の
開成と流量制御部43の流量制御のもとにボンベ4から
所定量のH1ガスが容器1内へ導入される。還元性のガ
スとしてH2 ガスのみを用いるときは、弁51、52の
開成と流量制御部53による流量制御のもとに、ボンベ
5から所定量のH2 ガスが容器1内へ導入される。還元
性ガスとしてさらにCOガスも用いるときは、同様にし
て、ボンベ6から所定量のCOガスも容器1内へ導入さ
れる。
Further, the vacuum container 1 is connected with an exhaust device 7 for exhausting the inside of the vacuum container 1 to a predetermined vacuum degree. According to the RIE apparatus, first, the workpiece 8 having the ITO on which the predetermined pattern is drawn by the resist film is formed on the holder 2.
After that, the vacuum container 1 is evacuated to a predetermined vacuum degree by the exhaust device 7, and then a predetermined amount of H1 is discharged from the cylinder 4 under the control of the opening of the valves 41 and 42 and the flow rate control of the flow rate control unit 43. Gas is introduced into the container 1. When only H 2 gas is used as the reducing gas, a predetermined amount of H 2 gas is introduced into the container 1 from the cylinder 5 under the control of the opening of the valves 51 and 52 and the flow rate control by the flow rate control unit 53. . When CO gas is also used as the reducing gas, a predetermined amount of CO gas is similarly introduced into the container 1 from the cylinder 6.

【0014】このようにして、容器1内にHIガス及び
還元性ガスが導入され、且つ、所定のエッチング真空度
に維持された状態で、さらにヒータ21にて被加工物8
が所定エッチング温度に制御された状態で、高周波電圧
印加装置20からホルダ2へ、従って被加工物8に所定
の高周波電圧が印加されると、HIガス及び還元性ガス
がプラズマ化され、このプラズマのもとに被加工物8に
おける露出ITOがドライエッチングされる。
In this way, with the HI gas and the reducing gas introduced into the container 1 and the predetermined etching vacuum degree is maintained, the workpiece 21 is further heated by the heater 21.
When a predetermined high-frequency voltage is applied from the high-frequency voltage applying device 20 to the holder 2, and thus to the workpiece 8 in a state where is controlled to a predetermined etching temperature, the HI gas and the reducing gas are turned into plasma, and this plasma The exposed ITO in the work piece 8 is dry-etched under the condition.

【0015】以下、ITO膜質の異なる二つの被加工物
8(8A、8B)におけるITOの本発明によるドライ
エッチングの具体的実施例と、水素ガスその他の還元性
ガスを用いない比較例について説明する。 実施例 a.エッチング条件 容器1内のエッチング真空度:60mmTorr 高周波電圧電源 :13.56MHz 290W HIガス :60sccm H2 ガス :20sccm ITOのエッチング温度 :180℃ b.ITOのエッチング速度 被加工物8A :450Å/min 被加工物8B :500Å/min 比較例 a.エッチング条件 容器1内のエッチング真空度:60mmTorr 高周波電圧電源 :13.56MHz 290W HIガス :60sccm 水素ガスその他の還元性ガス使用せず。
A specific example of dry etching of ITO in two workpieces 8 (8A, 8B) having different ITO film qualities according to the present invention and a comparative example using no hydrogen gas or other reducing gas will be described below. . Example a. Etching conditions Etching vacuum degree in container 1: 60 mmTorr High frequency voltage power source: 13.56 MHz 290 W HI gas: 60 sccm H 2 gas: 20 sccm ITO etching temperature: 180 ° C. b. Etching rate of ITO Workpiece 8A: 450 Å / min Workpiece 8B: 500 Å / min Comparative Example a. Etching condition Degree of etching vacuum in the container 1: 60 mmTorr High frequency voltage power source: 13.56 MHz 290 W HI gas: 60 sccm Hydrogen gas or other reducing gas was not used.

【0016】 ITOのエッチング温度 :180℃ b.ITOのエッチング速度 被加工物8A :210Å/min 被加工物8B :450Å/min 以上説明した実施例及び比較例のそれぞれにおける二つ
の被加工物8A、8BのITOエッチング速度から分か
るように、エッチングガスとしてHIガスに加え、水素
ガスも採用すると、ITOの膜質に拘らずエッチング速
度の変動が少なくなっており、実用に供し得ることが分
かる。
ITO etching temperature: 180 ° C. b. Etching rate of ITO Processed object 8A: 210Å / min Worked object 8B: 450Å / min As can be seen from the ITO etching rate of the two processed objects 8A and 8B in each of the examples and comparative examples described above, the etching gas As a result, when hydrogen gas is used in addition to HI gas, the fluctuation of the etching rate is small regardless of the film quality of ITO, and it can be seen that it can be put to practical use.

【0017】H2 ガスの添加によりエッチング速度の変
動が少なくなるのは、H2 ガスの添加により、ITO中
のSn−O結合が偏析している部位でもSnとOの分離
が促進され、SnとHIから発生したIとの結合が抑制
されて比較的蒸気圧の低いSn−I結合物の生成が抑制
される一方、H2 の使用によりSn−I結合物より蒸気
圧の高いSnとHとの結合物が活発に生成されるからと
考えられる。
The addition of H 2 gas reduces the fluctuation of the etching rate because the addition of H 2 gas promotes the separation of Sn and O even in the region where the Sn--O bond in ITO is segregated. Of the Sn and I generated from HI is suppressed to suppress the production of Sn-I bond having a relatively low vapor pressure, while the use of H 2 causes Sn and H to have a higher vapor pressure than the Sn-I bond. It is considered that the binding product with and is actively generated.

【0018】なお、以上説明した実施例ではRIE法を
説明したが、本発明はこの方法に限らず、プラズマを利
用したその他の各種ドライエッチング法、例えば、電子
サイクロトロン共鳴エッチング(ECR)、マグネトロ
ンエッチング等にも適用できる。
Although the RIE method has been described in the above-described embodiments, the present invention is not limited to this method, and various other dry etching methods using plasma, such as electron cyclotron resonance etching (ECR) and magnetron etching. Etc. can also be applied.

【0019】[0019]

【発明の効果】以上説明したように本発明によると、H
Iガスを用いるITOのドライエッチング方法であっ
て、ITOの膜質に拘らず、エッチング速度の変動が少
ないITOのドライエッチング方法を提供することがで
きる。
As described above, according to the present invention, H
It is possible to provide a dry etching method for ITO using I gas, which has a small fluctuation in etching rate regardless of the film quality of ITO.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明方法の実施に用いるエッチング装置例で
あるRIE装置の概略構成を示す図である。
FIG. 1 is a diagram showing a schematic configuration of an RIE apparatus which is an example of an etching apparatus used for carrying out a method of the present invention.

【符号の説明】[Explanation of symbols]

1 真空容器 2 被加工物ホルダ 20 高周波電圧印加装置 3 エッチング用ガス導入部 4 HIガスボンベ 5 H2 ガスボンベ 6 COガスボンベ 7 排気装置 8 被加工物1 Vacuum Container 2 Workpiece Holder 20 High Frequency Voltage Applying Device 3 Etching Gas Introducing Section 4 HI Gas Cylinder 5 H 2 Gas Cylinder 6 CO Gas Cylinder 7 Exhaust Device 8 Workpiece

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 ヨウ化水素とエッチング種及び還元種と
しての水素ガスとを含むガスのプラズマによりITOを
ドライエッチングすることを特徴とするITOのドライ
エッチング方法。
1. A dry etching method for ITO, which comprises dry etching the ITO by plasma of a gas containing hydrogen iodide and hydrogen gas as an etching species and a reducing species.
【請求項2】 前記ヨウ化水素とエッチング種及び還元
種としての水素ガスとを含むガスが水素ガス以外の還元
性ガスを含んでいる請求項1記載のITOのドライエッ
チング方法。
2. The dry etching method for ITO according to claim 1, wherein the gas containing hydrogen iodide and hydrogen gas as an etching species and a reducing species contains a reducing gas other than hydrogen gas.
【請求項3】 エッチング中、被エッチングITOの温
度を80℃〜250℃の範囲に制御する請求項1、2又
は3記載のITOのドライエッチング方法。
3. The method of dry etching ITO according to claim 1, 2 or 3, wherein the temperature of the ITO to be etched is controlled within a range of 80 ° C. to 250 ° C. during etching.
JP5063192A 1992-03-09 1992-03-09 Ito dry etching method Withdrawn JPH05251400A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5063192A JPH05251400A (en) 1992-03-09 1992-03-09 Ito dry etching method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5063192A JPH05251400A (en) 1992-03-09 1992-03-09 Ito dry etching method

Publications (1)

Publication Number Publication Date
JPH05251400A true JPH05251400A (en) 1993-09-28

Family

ID=12864324

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5063192A Withdrawn JPH05251400A (en) 1992-03-09 1992-03-09 Ito dry etching method

Country Status (1)

Country Link
JP (1) JPH05251400A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5843277A (en) * 1995-12-22 1998-12-01 Applied Komatsu Technology, Inc. Dry-etch of indium and tin oxides with C2H5I gas
WO1998059379A1 (en) * 1997-06-25 1998-12-30 Applied Komatsu Technology, Inc. Dry-etching of indium and tin oxides
EP0896373A2 (en) * 1997-08-08 1999-02-10 Mitsui Chemicals, Inc. Dry etching method of metal oxide/photoresist film laminate
JP2003068155A (en) * 2001-08-30 2003-03-07 Ulvac Japan Ltd Dry etching method for transparent conductive film

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5843277A (en) * 1995-12-22 1998-12-01 Applied Komatsu Technology, Inc. Dry-etch of indium and tin oxides with C2H5I gas
WO1998059379A1 (en) * 1997-06-25 1998-12-30 Applied Komatsu Technology, Inc. Dry-etching of indium and tin oxides
EP0896373A2 (en) * 1997-08-08 1999-02-10 Mitsui Chemicals, Inc. Dry etching method of metal oxide/photoresist film laminate
EP0896373A3 (en) * 1997-08-08 2001-01-17 Mitsui Chemicals, Inc. Dry etching method of metal oxide/photoresist film laminate
JP2003068155A (en) * 2001-08-30 2003-03-07 Ulvac Japan Ltd Dry etching method for transparent conductive film

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