JPH0645289A - Manufacture of semiconductor device - Google Patents

Manufacture of semiconductor device

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Publication number
JPH0645289A
JPH0645289A JP19260192A JP19260192A JPH0645289A JP H0645289 A JPH0645289 A JP H0645289A JP 19260192 A JP19260192 A JP 19260192A JP 19260192 A JP19260192 A JP 19260192A JP H0645289 A JPH0645289 A JP H0645289A
Authority
JP
Japan
Prior art keywords
selection ratio
tungsten
ratio relative
etching
resist
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Withdrawn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
JP19260192A
Other languages
Japanese (ja)
Inventor
Hiromi Hayashi
浩美 林
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP19260192A priority Critical patent/JPH0645289A/en
Publication of JPH0645289A publication Critical patent/JPH0645289A/en
Withdrawn legal-status Critical Current

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  • Drying Of Semiconductors (AREA)

Abstract

PURPOSE:To increase an etch rate, and to improve a selection ratio relative to a substrate dielectric film and a selection ratio relative to a resist by the use of a chlorine gas alone as an etchant gas when tungsten is subjected to dry etching. CONSTITUTION:An ECR type etching device is provided with a chiller 16 for high temperature purposes that uses a silicon oil as a coolant 17, and the surrounding area of an electrode is kept at a high temperature. Although the temperature of the chiller 16 is set to more than 50 deg.C in accordance with a process, superior etching characteristics are obtained at temperatures between 80-100 deg.C or thereabouts. At this time, the temperature of a wafer ranges from 150 to 170 deg.C, and only a chlorine gas is used as an etchant gas 14. For instance, in the case of a layered product made of Ti+TiN+W, the flow rate of the chlorine gas is set to 100sc cm, and a microwave power is set to 800W, and then an RF power is set to 200W. According to this method, an etch rate is improved, and a selection ratio relative to a substrate dielectric film and a selection ratio relative to a resist can be improved.

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,半導体装置の製造方
法,特にタングステン(W)のドライエッチング方法に
関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a semiconductor device, and more particularly to a method of dry etching tungsten (W).

【0002】半導体デバイスの高性能化に伴って,配線
材料としてタングステン(W)が注目されている。その
ために,効果的なタングステン(W)の異方性エッチン
グ技術が求められている。
As the performance of semiconductor devices has increased, tungsten (W) has attracted attention as a wiring material. Therefore, an effective anisotropic etching technique for tungsten (W) is required.

【0003】[0003]

【従来の技術】従来,タングステン(W)のドライエッ
チングには,主にフッ素系のガスを使用していたが,塩
素系ガスを用いることも知られている(例えば,特開昭
63−250475号公報,特開平2−94520号公
報参照)。しかしながら,いずれの公報に記載の技術に
おいても,Cl2 のみではエッチング速度が遅く,また
下地絶縁膜との選択比が取れないので,酸素を添加して
いる。
2. Description of the Related Art Conventionally, a fluorine-based gas has been mainly used for dry etching of tungsten (W), but it is also known to use a chlorine-based gas (for example, JP-A-63-250475). (See Japanese Patent Laid-Open No. 2-94520). However, in any of the techniques described in any of the publications, oxygen is added because Cl 2 alone slows the etching rate and cannot provide a selective ratio with the underlying insulating film.

【0004】[0004]

【発明が解決しようとする課題】従来の技術では,タン
グステン(W)をドライエッチングする際に,塩素(C
2 )に酸素(O2 )を添加しなければならないので,
次の問題があった。
In the prior art, when dry etching tungsten (W), chlorine (C) is used.
Since oxygen (O 2 ) must be added to l 2 ),
I had the following problem.

【0005】 対レジスト選択比が低下する。 酸素(O2 )を入れ過ぎると,エッチングが停止す
る等の副作用が生じる。
The selection ratio with respect to resist is lowered. If oxygen (O 2 ) is added too much, side effects such as etching stoppage occur.

【0006】 酸素(O2 )を最適な添加量で添加し
ても,さほどエッチング特性は向上しない。 本発明は,上記の問題点を解決して,エッチング速度を
向上させると共に,対下地絶縁膜選択比および対レジス
ト選択比を向上させることのできる,半導体装置の製造
方法,特にタングステンのドライエッチング方法を提供
することを目的とする。
Even if oxygen (O 2 ) is added in an optimum amount, the etching characteristics are not so improved. The present invention solves the above problems, improves the etching rate, and improves the selectivity ratio to the underlying insulating film and the selectivity ratio to the resist, and a method for manufacturing a semiconductor device, especially a dry etching method for tungsten. The purpose is to provide.

【0007】[0007]

【課題を解決するための手段】上記の目的を達成するた
めに,本発明に係る半導体装置の製造方法は,タングス
テンのドライエッチング方法であって,エッチャントガ
スとして塩素ガスのみを用いるように構成する。
In order to achieve the above object, a method of manufacturing a semiconductor device according to the present invention is a dry etching method for tungsten, and is configured to use only chlorine gas as an etchant gas. .

【0008】[0008]

【作用】本発明では,タングステン(W)のドライエッ
チングにおいて,エッチャントにCl2 のみを用いてい
る。その結果,上述した従来技術の問題点が解決され,
エッチング速度が向上すると共に,対下地絶縁膜選択比
および対レジスト選択比を充分に取ることのできる,タ
ングステン(W)のドライエッチング方法が得られる。
In the present invention, only Cl 2 is used as an etchant in the dry etching of tungsten (W). As a result, the above-mentioned problems of the prior art are solved,
A dry etching method for tungsten (W) is obtained which can improve the etching rate and can sufficiently obtain the selection ratio to the underlying insulating film and the selection ratio to the resist.

【0009】また,タングステン(W)の塩化物は揮発
性が低いので,本発明では,ウェーハ温度を高めるよう
にしている。ウェーハ温度は,ウェーハ温度を制御する
チラーの温度を上げることにより高めることができる。
チラーの液体には,80℃以上の高温にできるように,
シリコーンオイルを用いる。
Since the chloride of tungsten (W) has low volatility, the wafer temperature is raised in the present invention. The wafer temperature can be increased by raising the temperature of the chiller that controls the wafer temperature.
The chiller liquid can be heated to a high temperature of 80 ° C or higher.
Use silicone oil.

【0010】ウェーハ温度を上げるのに従い,タングス
テン(W)のエッチング速度が向上すると共に,対下地
絶縁膜選択比および対レジスト選択比が向上する。(ウ
ェーハ温度を上げるのに従って,絶縁膜やレジストのエ
ッチング速度も上がるが,タングステン(W)のエッチ
ング速度の向上の方が顕著である。)これらは,従来技
術のように,チラー温度が常温で,酸素を添加する方法
より効果が大きい。
As the wafer temperature is increased, the etching rate of tungsten (W) is improved, and the selection ratio to the underlying insulating film and the selection ratio to the resist are improved. (As the wafer temperature is increased, the etching rate of the insulating film and the resist is increased, but the etching rate of tungsten (W) is more remarkable.) , It is more effective than the method of adding oxygen.

【0011】また,ウェーハ温度を上げるだけでは,タ
ングステン(W)の塩化物の揮発に不充分な場合には,
プラズマ密度を上げる方法を採る。そのためには,装置
にECR( Electron Cyclotron Resonance ) 型エッチ
ャーを用いる。
In addition, when increasing the wafer temperature is not sufficient for volatilization of tungsten (W) chloride,
Take a method to increase the plasma density. For that purpose, an ECR (Electron Cyclotron Resonance) type etcher is used for the apparatus.

【0012】ECR型エッチャーを使用する場合,低真
空圧下でも高密度プラズマが得られるので,微細加工に
有利になり,スループットおよび半導体デバイスの製造
歩留まりが向上する。
When the ECR type etcher is used, a high density plasma can be obtained even under a low vacuum pressure, which is advantageous for fine processing and improves the throughput and the manufacturing yield of semiconductor devices.

【0013】[0013]

【実施例】図1は,本発明に用いるECR型エッチャー
の概要を示す図である。図中,11はプラズマチャンバ
ー,12はマグネットコイル,13はマイクロ波(2.
45GHz),14はエッチャントガス(塩素(C
2 )ガス),15は反応室,16はチラー,17は冷
却液,18はウェーハ,19はマッチングボックス,2
0はRFジェネレータ(13.56MHz)である。
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing an outline of an ECR type etcher used in the present invention. In the figure, 11 is a plasma chamber, 12 is a magnet coil, and 13 is a microwave (2.
45 GHz, 14 is an etchant gas (chlorine (C
l 2 ) gas), 15 a reaction chamber, 16 a chiller, 17 a cooling liquid, 18 a wafer, 19 a matching box, 2
0 is an RF generator (13.56 MHz).

【0014】図1に示すECR型エッチャーでは,冷却
液17としてシリコーンオイルを用いた高温用チラー1
6を取り付け,電極回りを高温にしている。チラー16
の温度は,プロセスにより50℃以上に設定するが,8
0〜100℃程度で良好なエッチング特性が得られる。
このときのウェーハ温度は,150〜170℃である。
In the ECR type etcher shown in FIG. 1, a high temperature chiller 1 using silicone oil as a cooling liquid 17 is used.
6 is attached and the temperature around the electrode is high. Chiller 16
The temperature is set to 50 ℃ or higher depending on the process, but
Good etching characteristics can be obtained at about 0 to 100 ° C.
The wafer temperature at this time is 150 to 170 ° C.

【0015】本発明では,エッチャントガス14とし
て,塩素(Cl2 )ガスのみを使用する。以下,エッチ
ングサンプルとして,Ti(膜厚200Å)+TiN
(膜厚1000Å)+W(膜厚3000Å)の積層体に
本発明による方法を適用した例を説明する。エッチング
条件は,次の通りである。
In the present invention, only chlorine (Cl 2 ) gas is used as the etchant gas 14. Below, as an etching sample, Ti (film thickness 200Å) + TiN
An example in which the method according to the present invention is applied to a laminated body of (thickness 1000 Å) + W (thickness 3000 Å) will be described. The etching conditions are as follows.

【0016】 マイクロ波パワー :800W マグネットコイル電流 :21A 真空圧力 :4mTorr RFパワー :200W 塩素(Cl2 )ガス流量 :100sccm 以上の条件で,TiN+Wの積層体をエッチングしたと
ころ,次の結果が得られた。
Microwave power: 800 W Magnet coil current: 21 A Vacuum pressure: 4 mTorr RF power: 200 W Chlorine (Cl 2 ) gas flow rate: 100 sccm The following results were obtained when the TiN + W laminate was etched under the above conditions. It was

【0017】 Wのエッチング速度 :2500Å/min TiNのエッチング速度 :3500Å/min Wの対レジスト選択比 :2 Wの対SiO2 選択比 :10 エッチング後の形状を図2に,本発明によるタングステ
ン(W)のエッチング例として示す。同図は,本発明の
方法によりTi+TiN+Wの積層体をエッチングした
ものの断面SEM写真を基に描いた模式図である。
Etching rate of W: 2500 Å / min TiN etching rate: 3500 Å / min W: Resist selectivity: 2 W: SiO 2 selectivity: 10 The shape after etching is shown in FIG. W) is shown as an example of etching. The figure is a schematic drawing based on a cross-sectional SEM photograph of a Ti + TiN + W laminated body etched by the method of the present invention.

【0018】図2から,本発明によれば,タングステン
(W)を良好な形状に異方性エッチングできることが分
かる。
From FIG. 2, it is understood that according to the present invention, tungsten (W) can be anisotropically etched into a good shape.

【0019】[0019]

【発明の効果】本発明によれば,タングステンのドライ
エッチング方法において,エッチング速度を向上させる
と共に,対下地絶縁膜選択比および対レジスト選択比を
向上させることが可能になる。
According to the present invention, in the tungsten dry etching method, it is possible to improve the etching rate and the selection ratio to the underlying insulating film and the selection ratio to the resist.

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

【図1】本発明に用いるECR型エッチャーの概要を示
す図である。
FIG. 1 is a diagram showing an outline of an ECR type etcher used in the present invention.

【図2】本発明によるタングステン(W)のエッチング
例を示す図である。
FIG. 2 is a diagram showing an example of etching tungsten (W) according to the present invention.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 タングステンのドライエッチング方法で
あって, エッチャントガスとして塩素ガスのみを用いることを特
徴とする半導体装置の製造方法。
1. A method of manufacturing a semiconductor device, which is a dry etching method for tungsten, wherein only chlorine gas is used as an etchant gas.
JP19260192A 1992-07-21 1992-07-21 Manufacture of semiconductor device Withdrawn JPH0645289A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19260192A JPH0645289A (en) 1992-07-21 1992-07-21 Manufacture of semiconductor device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19260192A JPH0645289A (en) 1992-07-21 1992-07-21 Manufacture of semiconductor device

Publications (1)

Publication Number Publication Date
JPH0645289A true JPH0645289A (en) 1994-02-18

Family

ID=16293982

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19260192A Withdrawn JPH0645289A (en) 1992-07-21 1992-07-21 Manufacture of semiconductor device

Country Status (1)

Country Link
JP (1) JPH0645289A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002134480A (en) * 2000-10-25 2002-05-10 Sony Corp Method for manufacturing semiconductor device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002134480A (en) * 2000-10-25 2002-05-10 Sony Corp Method for manufacturing semiconductor device

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Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 19991005