JPH07135202A - Manufacture of semiconductor device - Google Patents

Manufacture of semiconductor device

Info

Publication number
JPH07135202A
JPH07135202A JP27964693A JP27964693A JPH07135202A JP H07135202 A JPH07135202 A JP H07135202A JP 27964693 A JP27964693 A JP 27964693A JP 27964693 A JP27964693 A JP 27964693A JP H07135202 A JPH07135202 A JP H07135202A
Authority
JP
Japan
Prior art keywords
film
tungsten
insulating film
gate
layer
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Withdrawn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
JP27964693A
Other languages
Japanese (ja)
Inventor
Takatoshi Ushigoe
貴俊 牛越
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.)
MIYAGI OKI DENKI KK
Oki Electric Industry Co Ltd
Original Assignee
MIYAGI OKI DENKI KK
Oki Electric Industry Co Ltd
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 MIYAGI OKI DENKI KK, Oki Electric Industry Co Ltd filed Critical MIYAGI OKI DENKI KK
Priority to JP27964693A priority Critical patent/JPH07135202A/en
Publication of JPH07135202A publication Critical patent/JPH07135202A/en
Withdrawn legal-status Critical Current

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  • Formation Of Insulating Films (AREA)
  • Electrodes Of Semiconductors (AREA)
  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)

Abstract

PURPOSE:To flatten an interlayer insulating film and the residue of etching is completely removed by a method wherein the stepped part formed on a semiconductor element is filled with a metal layer and the buried metal layer is transformed into an insulating film. CONSTITUTION:A gate oxide film 22 is formed on a semiconductor substrate 21, and a gate electrode 23 of a transistor is formed. Phosphorus ions (<32>P<+>) 24 are implanted to the semiconductor substrate 21 through the intermediary of the gate oxide film 22. A PSG film 26 is formed, and a side wall layer 27 is formed by conducting overall etching. Then, phosphorus ions (<73>AS<+>) 28 and the like are implanted, and an implanted layer 29 is formed. Then, a tungsten film is formed using a burying tungsten (blanket tungsten) device. WF6 gas is used. Subsequently, the above-mentioned material is oxidized at 600 deg.C using a high voltage oxidizing oven, and a WO3 film 31 is formed. Then, an interlayer insulating film 32 is formed, and the second gate polycrystalline silicon film 33 is formed using a resist 34. As a result, the polycrystalline silicon film is completely removed.

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、段差部を有する半導体
装置の製造方法に係り、特に、段差部に残る残膜をなく
すようにした半導体装置の製造方法に関するものであ
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a semiconductor device having a step portion, and more particularly to a method of manufacturing a semiconductor device in which a residual film remaining on the step portion is eliminated.

【0002】[0002]

【従来の技術】従来、このような分野の技術としては、
例えば、以下に記載するようなものがあった。図2はか
かる従来の半導体装置の製造工程断面図である。まず、
図2(a)に示すように、半導体基板1上にゲート酸化
膜2を形成し、その後、公知のLPCVD法により、多
結晶シリコン膜を形成後、ホトリソ、エッチング工程を
施し、トランジスタのゲート電極3を形成する。
2. Description of the Related Art Conventionally, as a technique in such a field,
For example, there were the following. FIG. 2 is a cross-sectional view of a manufacturing process of such a conventional semiconductor device. First,
As shown in FIG. 2A, a gate oxide film 2 is formed on a semiconductor substrate 1, and then a polycrystalline silicon film is formed by a known LPCVD method, followed by photolithography and etching steps to form a gate electrode of a transistor. 3 is formed.

【0003】次に、トランジスタの電界集中を避けるた
めのN- 層を形成するため、イオン注入により、例え
ば、リンイオン(32+ )4をゲート酸化膜2を介し
て、半導体基板1に打ち込む。次に、図2(b)に示す
ように、サイドウォール層を形成するために、PSG膜
6を形成する。ここで、5はリンイオン(32+ )4の
打ち込みにより形成されるN- 層である。
Next, in order to form an N layer for avoiding the electric field concentration of the transistor, for example, phosphorus ions ( 32 P + ) 4 are implanted into the semiconductor substrate 1 through the gate oxide film 2 by ion implantation. Next, as shown in FIG. 2B, a PSG film 6 is formed to form a sidewall layer. Here, 5 is an N layer formed by implanting phosphorus ions ( 32 P + ) 4.

【0004】次に、図2(c)に示すように、公知のR
IEエッチングで全面エッチングし、サイドウォール層
7を形成する。この後、ソース/ドレインを形成するた
めに、砒素イオン(73As+ )8等を打ち込み、打ち込
み層9を形成する。次いで、図2(d)に示すように、
アニーリングを行い、N- 層10、N+ 層11を形成
し、その後、層間絶縁膜12(NSG,BPSG膜な
ど)を介し、第2ゲート用多結晶シリコン膜13を形成
する。
Next, as shown in FIG. 2C, a known R
The entire surface is etched by the IE etching to form the sidewall layer 7. Thereafter, in order to form the source / drain, arsenic ions ( 73 As + ) 8 and the like are implanted to form the implantation layer 9. Then, as shown in FIG.
Annealing is performed to form an N layer 10 and an N + layer 11, and then a second gate polycrystalline silicon film 13 is formed via an interlayer insulating film 12 (NSG, BPSG film, etc.).

【0005】次に、図2(e)に示すように、第2ゲー
ト用多結晶シリコン膜13を公知のホトリソ技術でパタ
ーニングし、レジスト14を介し、RIEでエッチング
する。この場合、層間絶縁膜12上に第2ゲート用多結
晶シリコン膜13が残膜し、サイドウォール16が形成
されることがある。
Next, as shown in FIG. 2E, the second gate polycrystalline silicon film 13 is patterned by a known photolithography technique, and is etched by RIE through the resist 14. In this case, the second gate polycrystalline silicon film 13 may remain on the interlayer insulating film 12, and the sidewall 16 may be formed.

【0006】[0006]

【発明が解決しようとする課題】しかしながら、上記し
た半導体装置の製造方法は、微細化が進めば進むほど、
RIE(反応性イオンエッチング)エッチングの使用が
多くなり、第1ゲート膜のエッチング形状、サイドウォ
ール層の形状のちょっとした変化により、その上の絶縁
膜の形状が変化し、第2ゲート用多結晶シリコン膜のエ
ッチング残りが発生し、回路上にショートモードが発生
する。
However, in the above-described method for manufacturing a semiconductor device, as the miniaturization progresses,
The use of RIE (Reactive Ion Etching) etching has increased, and the shape of the insulating film on the first gate film and the shape of the sidewall layer change due to slight changes in the shape of the sidewall layer. An etching residue of the film occurs, and a short mode occurs on the circuit.

【0007】図3のA部に示すように、第1ゲート膜
(トランジスタのゲート電極)が、若干アンダーカット
になった場合、導体膜残りは最悪の状態になる。逆に、
図4のB部に示すように、第1ゲート(トランジスタの
ゲート電極)膜にテーパがついた場合は、導体膜残りは
皆無となるが、トランジスタの実効ゲート長が長くな
り、所望の特性が得られない。
As shown in part A of FIG. 3, when the first gate film (gate electrode of the transistor) is slightly undercut, the remaining conductor film is in the worst state. vice versa,
As shown in part B of FIG. 4, when the first gate (gate electrode of the transistor) film has a taper, there is no conductor film remaining, but the effective gate length of the transistor becomes long and desired characteristics are not obtained. I can't get it.

【0008】他の方法として、公知のシリカフィルムを
使用する方法もあるが、不安定な膜であるため、ゲート
形成以前に作る場合は信頼性に欠ける。本発明は、以上
述べた第1ゲート膜のエッチング形状の微妙なばらつき
に対して発生する第2ゲート用導体膜(多結晶シリコ
ン)のエッチング残りの問題点を解決するため、層間絶
縁膜形成以前に埋め込みタングステン膜をひき、このタ
ングステン膜を低温で酸化して絶縁膜とし、層間絶縁膜
を平坦化し、エッチング残りをなくすようにした半導体
装置の製造方法を提供することを目的とする。
As another method, there is a method of using a known silica film, but since it is an unstable film, it is not reliable when it is formed before the gate formation. In order to solve the above-described problem of the etching residue of the second gate conductor film (polycrystalline silicon) that occurs due to the subtle variations in the etching shape of the first gate film, the present invention has It is an object of the present invention to provide a method for manufacturing a semiconductor device in which a buried tungsten film is formed, and the tungsten film is oxidized at a low temperature to form an insulating film, and the interlayer insulating film is flattened to eliminate etching residue.

【0009】ただし、この場合、タングステン膜を酸化
した後、すぐに、層間絶縁膜を施す必要がある。これ
は、WO3 膜はある程度温度をかけると消滅する性質が
あるためである。
In this case, however, it is necessary to apply the interlayer insulating film immediately after oxidizing the tungsten film. This is because the WO 3 film has the property of disappearing when a certain temperature is applied.

【0010】[0010]

【課題を解決するための手段】本発明は、上記目的を達
成するために、半導体装置の製造方法において、段差部
が形成される半導体素子を形成する工程と、該段差部を
金属層で埋め込む工程と、該埋め込んだ金属層を絶縁膜
に変質する工程とを順に施すようにしたものである。
In order to achieve the above-mentioned object, the present invention provides a method of manufacturing a semiconductor device, which comprises a step of forming a semiconductor element having a step portion and a step of filling the step portion with a metal layer. The step and the step of transforming the embedded metal layer into an insulating film are sequentially performed.

【0011】また、前記段差部が形成される半導体素子
はゲート電極を有するトランジスタであり、前記金属層
はタングステンを用いるようにしたものである。更に、
前記金属層を絶縁膜に変える工程は、タングステン膜を
形成した後、600℃の温度の高圧酸化炉を用いて酸化
し、WO3 膜を形成するようにしたものである。
The semiconductor element in which the step portion is formed is a transistor having a gate electrode, and the metal layer is made of tungsten. Furthermore,
In the step of changing the metal layer into an insulating film, a WO 3 film is formed by forming a tungsten film and then oxidizing the film using a high pressure oxidation furnace at a temperature of 600 ° C.

【0012】[0012]

【作用】本発明によれば、上記したように、段差部が形
成される半導体素子を形成する工程と、その段差部を公
知の埋め込みタングステン装置でタングステン膜を埋め
込み、低温で酸化することにより、層間絶縁膜を形成す
る。したがって、層間絶縁膜を平坦化し、その後のパタ
ーン形成が容易で、かつ、エッチング工程において、異
方性の強いエッチング装置を使っても、エッチング残り
のない良好な特性を有する半導体装置を得ることができ
る。
According to the present invention, as described above, the step of forming a semiconductor element having a step portion and the step portion is filled with a tungsten film by a known buried tungsten device and oxidized at a low temperature. An interlayer insulating film is formed. Therefore, it is possible to obtain a semiconductor device which has a flat interlayer insulating film, facilitates subsequent pattern formation, and has no etching residue even when an etching device having strong anisotropy is used in the etching process. it can.

【0013】[0013]

【実施例】以下、本発明の実施例について図を参照しな
がら詳細に説明する。図1は本発明の実施例を示す半導
体装置の製造工程断面図である。まず、図1(a)に示
すように、半導体基板21上にゲート酸化膜22を形成
し、その後、公知のLPCVD法により、多結晶シリコ
ン膜を形成後、ホトリソ、エッチング工程を行い、トラ
ンジスタのゲート電極23を形成する。次に、トランジ
スタの電界集中を避けるためのN- 層を形成するため、
イオン注入により、例えば、リンイオン(32+ )24
をゲート酸化膜22を介して、半導体基板21に打ち込
む。
Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view of a semiconductor device manufacturing process showing an embodiment of the present invention. First, as shown in FIG. 1A, a gate oxide film 22 is formed on a semiconductor substrate 21, and then a polycrystalline silicon film is formed by a known LPCVD method, followed by a photolithography and etching process to form a transistor. The gate electrode 23 is formed. Next, in order to form an N layer for avoiding the electric field concentration of the transistor,
By ion implantation, for example, phosphorus ions ( 32 P + ) 24
Are implanted into the semiconductor substrate 21 through the gate oxide film 22.

【0014】次いで、図1(b)に示すように、サイド
ウォール層を形成するために、PSG膜26を形成す
る。ここで、25はリンイオン(32+ )24が打ち込
まれたN- 層である。次に、図1(c)に示すように、
公知のRIEエッチングで全面エッチングし、サイドウ
ォール層27を形成する。この後、ソース/ドレインを
形成するために、砒素イオン(73As+ )28等を打ち
込み、打ち込み層29を形成する。
Next, as shown in FIG. 1B, a PSG film 26 is formed to form a sidewall layer. Here, 25 is an N layer into which phosphorus ions ( 32 P + ) 24 are implanted. Next, as shown in FIG.
The entire surface is etched by known RIE etching to form the sidewall layer 27. Thereafter, in order to form the source / drain, arsenic ions ( 73 As + ) 28 and the like are implanted to form an implantation layer 29.

【0015】ここまでは、従来の製造工程と同様であ
る。次いで、図1(d)に示すように、アニールしてソ
ース/ドレインを形成し、次に公知の埋め込みタングス
テン(ブランケットタングステン)装置でタングステン
膜を形成する。使用ガスはWF6 を使用する。この後、
600℃の温度の酸化炉を用いて酸化し、WO3 膜31
を形成する。この場合、タングステンの酸化は低温では
困難であるので、高圧酸化炉を用いるのが望ましい。次
に、層間絶縁膜32を形成し、第2ゲート用多結晶シリ
コン膜33を形成する。なお、30はN- 層である。こ
の層間絶縁膜32は、タングステンの酸化後すぐに、好
ましくは同一炉内等で形成する。これはWO3 膜はある
程度温度をかけると消滅する性質があるためである。
The process up to this point is the same as the conventional manufacturing process. Then, as shown in FIG. 1D, annealing is performed to form a source / drain, and then a tungsten film is formed by a known buried tungsten (blanket tungsten) device. The gas used is WF 6 . After this,
Oxidation is performed using an oxidation furnace at a temperature of 600 ° C., and the WO 3 film 31
To form. In this case, since it is difficult to oxidize tungsten at a low temperature, it is desirable to use a high pressure oxidation furnace. Next, the interlayer insulating film 32 is formed and the second gate polycrystalline silicon film 33 is formed. Incidentally, 30 is an N layer. The interlayer insulating film 32 is formed immediately after the oxidation of tungsten, preferably in the same furnace or the like. This is because the WO 3 film has the property of disappearing when a certain temperature is applied.

【0016】サイドウォール形状が、例えば、図3のA
部のようになっても、ブランケットタングステン膜は、
このA部の所により速く成長するため、その後の形状が
平坦化される。ただし、タングステン膜は厚くつけると
完全に平坦化されるが、その後の酸化処理に時間を要す
るために、サイドウォール側面を埋めるのみに使った方
が良い。
The sidewall shape is, for example, A in FIG.
Even if it becomes like the part, the blanket tungsten film is
Since the portion A grows faster, the subsequent shape is flattened. However, the tungsten film is completely flattened if it is made thick, but it takes time to oxidize thereafter, so it is better to use it only for filling the sidewall side surface.

【0017】その後、図1(e)に示すように、第2ゲ
ート用多結晶シリコン膜33を公知のホトリソ技術でレ
ジスト34を用いて形成する。これで多結晶シリコン膜
残りは皆無となる。また、本発明は上記実施例に限定さ
れるものではなく、本発明の趣旨に基づいて種々の変形
が可能であり、これらを本発明の範囲から排除するもの
ではない。
Thereafter, as shown in FIG. 1E, a second gate polycrystalline silicon film 33 is formed using a resist 34 by a known photolithography technique. As a result, there remains no remaining polycrystalline silicon film. Further, the present invention is not limited to the above embodiments, and various modifications can be made based on the spirit of the present invention, and these modifications are not excluded from the scope of the present invention.

【0018】[0018]

【発明の効果】以上、詳細に説明したように、本発明に
よれば、埋め込みタングステン膜を用い、段差部を埋め
るとともに、タングステン膜を絶縁膜に変えることによ
り、層間絶縁膜を平坦化し、その後のパターン形成が容
易で、かつエッチングで異方性の強いエッチング装置を
使っても、エッチング残りのない良好な特性を有する半
導体装置を得ることができる。
As described above in detail, according to the present invention, a buried tungsten film is used, the step portion is filled, and the tungsten film is changed to an insulating film to flatten the interlayer insulating film, and thereafter. It is possible to obtain a semiconductor device having good characteristics with no etching residue even when using an etching device which is easy to form a pattern and has a strong anisotropy in etching.

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

【図1】本発明の実施例を示す半導体装置の製造工程断
面図である。
FIG. 1 is a cross-sectional view of a manufacturing process of a semiconductor device showing an embodiment of the present invention.

【図2】従来の半導体装置の製造工程断面図である。FIG. 2 is a sectional view of a conventional semiconductor device manufacturing process.

【図3】従来の半導体装置の問題点を説明する断面図で
ある。
FIG. 3 is a sectional view illustrating a problem of a conventional semiconductor device.

【図4】従来の半導体装置の他の断面図である。FIG. 4 is another cross-sectional view of the conventional semiconductor device.

【符号の説明】[Explanation of symbols]

21 半導体基板 22 ゲート酸化膜 23 トランジスタのゲート電極 24 リンイオン(32+ ) 26 PSG膜 25,30 N- 層 27 サイドウォール層 28 砒素イオン(73As+ ) 29 打ち込み層 31 WO3 膜 32 層間絶縁膜 33 第2ゲート用多結晶シリコン膜 34 レジスト21 Semiconductor Substrate 22 Gate Oxide Film 23 Transistor Gate Electrode 24 Phosphorus Ion ( 32 P + ) 26 PSG Film 25, 30 N Layer 27 Sidewall Layer 28 Arsenic Ion ( 73 As + ) 29 Implantation Layer 31 WO 3 Film 32 Interlayer Insulation Film 33 Polycrystalline silicon film for second gate 34 Resist

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】(a)段差部が形成される半導体素子を形
成する工程と、(b)該段差部を金属層で埋め込む工程
と、(c)該埋め込んだ金属層を絶縁膜に変質する工程
とを順に施すことを特徴とする半導体装置の製造方法。
1. A step of (a) forming a semiconductor element having a step portion formed therein, (b) a step of filling the step portion with a metal layer, and (c) alteration of the filled metal layer into an insulating film. A method of manufacturing a semiconductor device, which comprises sequentially performing steps.
【請求項2】 前記段差部が形成される半導体素子はゲ
ート電極を有するトランジスタであり、前記金属層がタ
ングステンからなる請求項1記載の半導体装置の製造方
法。
2. The method for manufacturing a semiconductor device according to claim 1, wherein the semiconductor element in which the step portion is formed is a transistor having a gate electrode, and the metal layer is made of tungsten.
【請求項3】 前記金属層を絶縁膜に変質する工程はタ
ングステン膜を形成した後、600℃の温度の高圧酸化
炉を用いて酸化し、WO3 膜を形成することを特徴とす
る請求項2記載の半導体装置の製造方法。
3. The step of transforming the metal layer into an insulating film comprises forming a tungsten film and then oxidizing it by using a high pressure oxidation furnace at a temperature of 600 ° C. to form a WO 3 film. 2. The method for manufacturing a semiconductor device according to 2.
JP27964693A 1993-11-09 1993-11-09 Manufacture of semiconductor device Withdrawn JPH07135202A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27964693A JPH07135202A (en) 1993-11-09 1993-11-09 Manufacture of semiconductor device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27964693A JPH07135202A (en) 1993-11-09 1993-11-09 Manufacture of semiconductor device

Publications (1)

Publication Number Publication Date
JPH07135202A true JPH07135202A (en) 1995-05-23

Family

ID=17613887

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27964693A Withdrawn JPH07135202A (en) 1993-11-09 1993-11-09 Manufacture of semiconductor device

Country Status (1)

Country Link
JP (1) JPH07135202A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000026955A1 (en) * 1998-10-30 2000-05-11 Advanced Micro Devices, Inc. Fabrication of a transistor having an ultra-thin gate dielectric
WO2000075997A1 (en) * 1999-06-08 2000-12-14 Infineon Technologies Ag Non-volatile semiconductor memory cell, comprising a metal-oxide dielectric and a method for producing the same
WO2001024237A1 (en) * 1999-09-28 2001-04-05 Symetrix Corporation Integrated circuits with barrier layers and methods of fabricating same
WO2000041459A3 (en) * 1999-01-14 2001-05-10 Infineon Technologies Ag Semiconductor element with a tungsten oxide layer and method for its production
JP2021507522A (en) * 2017-12-20 2021-02-22 アプライド マテリアルズ インコーポレイテッドApplied Materials,Incorporated High pressure oxidation of metal film

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000026955A1 (en) * 1998-10-30 2000-05-11 Advanced Micro Devices, Inc. Fabrication of a transistor having an ultra-thin gate dielectric
WO2000041459A3 (en) * 1999-01-14 2001-05-10 Infineon Technologies Ag Semiconductor element with a tungsten oxide layer and method for its production
US6960541B2 (en) 1999-01-14 2005-11-01 Infineon Technologies Ag Process for fabrication of a semiconductor component having a tungsten oxide layer
KR100703260B1 (en) * 1999-01-14 2007-04-03 인피니언 테크놀로지스 아게 Semiconductor element and method for its production
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