JPH05206083A - Production of semiconductor device - Google Patents

Production of semiconductor device

Info

Publication number
JPH05206083A
JPH05206083A JP3848892A JP3848892A JPH05206083A JP H05206083 A JPH05206083 A JP H05206083A JP 3848892 A JP3848892 A JP 3848892A JP 3848892 A JP3848892 A JP 3848892A JP H05206083 A JPH05206083 A JP H05206083A
Authority
JP
Japan
Prior art keywords
film
gas
etching
layer
mask
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.)
Pending
Application number
JP3848892A
Other languages
Japanese (ja)
Inventor
Hidemitsu Aoki
秀充 青木
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP3848892A priority Critical patent/JPH05206083A/en
Publication of JPH05206083A publication Critical patent/JPH05206083A/en
Pending legal-status Critical Current

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Landscapes

  • Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
  • Drying Of Semiconductors (AREA)
  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)

Abstract

PURPOSE:To etch Cu film at a normal temperature by repeating the method of forming the reaction layer CuS of the Cu film by using SF6 gas or SH6 gas and Ar gas and the method of removing the reacting layer by etching using Ar gas. CONSTITUTION:Top layer SOG film 7 is patterned by dry etching the resist mask and bottom layer organic film 6 is patterned by etching using the SOG film 7 as a mask by O2 plasma. Thus, the mask for Cu film process is permitted to be the SOG 7/organic film 6 double-layer mask. A CuS reacting layer 9 is formed on Cu film 5 by SF6 gas or SH6 gas plasma using the double-layer mask and the CuS layer 9 is removed by etching by means of Ar gas plasma. Such two processes are repeated for approximately five times and the Cu film 5 is processed. Thus, etching at a normal temperature is permitted.

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、電子デバイス等の半導
体製造プロセスに用いられる半導体製造工程に関するも
のである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductor manufacturing process used in a semiconductor manufacturing process for electronic devices and the like.

【0002】[0002]

【従来の技術】最近のLSI技術においては、微細化で
ドライエッチングが進む一方、微細な配線では、電流密
度の増大が不可避となり、エレクトロマイグレーション
問題が顕在化してきた。配線の信頼性を向上するために
アルミニウムにSiやCuの添加が試みられる一方、C
u配線についての検討もなされている。
2. Description of the Related Art In recent LSI technology, while dry etching has progressed due to miniaturization, an increase in current density has become unavoidable with fine wiring, and an electromigration problem has become apparent. In order to improve the reliability of wiring, addition of Si or Cu to aluminum is tried, while C is added.
Investigations on u wiring have also been made.

【0003】Cu配線を加工する場合に、塩素系のガス
を用いてドライエッチングを施すが、CuClxの蒸気
圧が低いため、基板温度を300℃以上に昇温してい
る。この場合、通常のフォトレジストマスクでは、耐熱
性がないため、酸化膜等の耐熱性の高いマスク材料を使
用している。
When Cu wiring is processed, dry etching is performed using a chlorine-based gas, but the substrate temperature is raised to 300 ° C. or higher because the vapor pressure of CuClx is low. In this case, since a normal photoresist mask has no heat resistance, a mask material having high heat resistance such as an oxide film is used.

【0004】[0004]

【発明が解決しようとする課題】エッチングガスに塩素
系のガスを用いた場合、CuClxの蒸気圧が低いた
め、基板温度を300℃以上に昇温している。この場
合、通常のフォトレジストマスクでは、耐熱性がないた
め、酸化膜等の耐熱性の高いマスク材料を使用しなけれ
ばならない。エッチング時の基板温度を300℃以上に
保つためには、通常使用されているエッチング装置に基
板加熱用の装備を付け加えなければならない。また、こ
の酸化膜マスクは、配線の電気特性を測定する場合に
は、除去しなければ測定部と接触することができない。
When a chlorine-based gas is used as the etching gas, the substrate temperature is raised to 300 ° C. or higher because the vapor pressure of CuClx is low. In this case, since a normal photoresist mask has no heat resistance, a mask material having a high heat resistance such as an oxide film must be used. In order to keep the substrate temperature at the time of etching at 300 ° C. or higher, the equipment for heating the substrate must be added to a commonly used etching apparatus. Further, this oxide film mask cannot come into contact with the measurement portion unless it is removed when measuring the electrical characteristics of the wiring.

【0005】本発明は、このような従来の問題点を解決
し、常温でCu膜をエッチング加工しうる半導体装置の
製造方法を提供することを目的とする。
An object of the present invention is to provide a method of manufacturing a semiconductor device which solves the above-mentioned conventional problems and can etch a Cu film at room temperature.

【0006】[0006]

【課題を解決するための手段】上記目的を達成するた
め、本発明による半導体装置の製造方法においては、反
応層の形成工程と、ドライエッチング工程とを有し、C
u膜を微細加工する半導体装置の製造方法であって、反
応層形成工程は、SF6ガスまたはSH6ガスを用いてC
u膜の反応層を形成する工程であり、ドライエッチング
工程は、この反応層をArガスにてエッチング除去する
工程を繰り返すことによってCu膜を加工する工程であ
る。
In order to achieve the above object, a method of manufacturing a semiconductor device according to the present invention includes a step of forming a reaction layer and a dry etching step.
A method of manufacturing a semiconductor device in which a u film is microfabricated, wherein the reaction layer forming step uses C 6 by using SF 6 gas or SH 6 gas.
The dry etching step is a step of forming the reaction layer of the u film, and the dry etching step is a step of processing the Cu film by repeating the step of removing the reaction layer by etching with Ar gas.

【0007】[0007]

【作用】SF6ガスまたはSH6ガスを用いてCu膜とC
uSとの反応層を形成する。このCuS層は、Cu膜
と、Clガスとが反応した場合に生じるCuClx層の
ように体積が膨張することがなく、Arガスにて比較的
容易にエッチング除去することができる。従って、Cu
Sの反応層を形成しては、Arガスにてエッチングする
工程を繰り返すことによってCu膜に加工を施し、常温
でエッチングが可能となり、マスク材料にレジストまた
は、有機膜を使用することができる。
[Function] Cu film and C using SF 6 gas or SH 6 gas
A reaction layer with uS is formed. The CuS layer does not expand in volume unlike the CuClx layer generated when the Cu film reacts with Cl gas, and can be relatively easily etched and removed by Ar gas. Therefore, Cu
After forming the reaction layer of S, the Cu film is processed by repeating the step of etching with Ar gas, and etching can be performed at room temperature, and a resist or an organic film can be used as a mask material.

【0008】[0008]

【実施例】以下に本発明について図面を用いて説明す
る。図1(a)に示すように、Si基板1上に、酸化膜
または、窒化膜等の下地絶縁膜2を熱酸化法または、C
VD法にて形成し、この絶縁膜2上にスパッタ法また
は、CVD法にてTi膜3(0.05μm),TiN膜
4(0.1μm),Cu膜5(0.5μm)を順次形成
する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. As shown in FIG. 1A, a base insulating film 2 such as an oxide film or a nitride film is formed on a Si substrate 1 by a thermal oxidation method or C
A VD method is used, and a Ti film 3 (0.05 μm), a TiN film 4 (0.1 μm), and a Cu film 5 (0.5 μm) are sequentially formed on the insulating film 2 by a sputtering method or a CVD method. To do.

【0009】次いで、Cu膜5の上には、有機膜6,塗
布型酸化膜7(SOG:SpinOn Glass)を
順次形成し、この絶縁膜上に通常のフォトレジスト8を
塗布し、通常のフォトレジスト工程にて、レジスト8の
ようにパターニングを行う。
Next, an organic film 6 and a coating type oxide film 7 (SOG: SpinOn Glass) are sequentially formed on the Cu film 5, and a normal photoresist 8 is coated on this insulating film to make a normal photo resist. In the resist process, patterning is performed like the resist 8.

【0010】図1(b)に示すように、上層のSOG膜
7は、レジストマスクにCF4とCHF3ガスによるドラ
イエッチングでパターニングし、下層の有機膜6(1.
5μm)は、SOG膜7(0.16μm)をマスクに、
2プラズマによるエッチングでパターニングを行う。
この時、最上層のレジスト8は、エッチング除去されて
なくなる。従って、Cu膜加工時のマスクは、図1
(b)に示すようにSOG7/有機膜6の2層マスクと
なる。
As shown in FIG. 1B, the upper SOG film 7 is patterned by dry etching with CF 4 and CHF 3 gas on a resist mask, and the lower organic film 6 (1.
5 μm) using the SOG film 7 (0.16 μm) as a mask,
Patterning is performed by etching with O 2 plasma.
At this time, the uppermost resist 8 is removed by etching. Therefore, the mask for processing the Cu film is as shown in FIG.
As shown in (b), it becomes a two-layer mask of SOG7 / organic film 6.

【0011】図1(c)に示すように、2層マスクで、
SF6ガスまたはSH6ガスプラズマにてCu膜5にCu
Sの反応層9を0.1μm程度形成し、図2(d)に示
すように、ArガスプラズマにてCuS層9をエッチン
グ除去する。図2(c)と図2(d)に示す工程を5回
程度繰り返し、図2(e)に示すようにCu膜5の加工
を行う。このCu膜5のエッチング中に、上層SOG膜
7は、エッチングされてなくなる。図2(e)に示すT
iN膜4/Ti膜3の部分は、塩素系のガスでドライエ
ッチングを施す。エッチング後、図2(f)に示すよう
にO2プラズマにて有機膜6を除去する。
As shown in FIG. 1 (c), with a two-layer mask,
Cu on the Cu film 5 by SF 6 gas or SH 6 gas plasma
A reaction layer 9 of S is formed to a thickness of about 0.1 μm, and the CuS layer 9 is removed by etching with Ar gas plasma, as shown in FIG. The steps shown in FIGS. 2C and 2D are repeated about 5 times to process the Cu film 5 as shown in FIG. During the etching of the Cu film 5, the upper SOG film 7 is etched and disappears. T shown in FIG.
The portion of the iN film 4 / Ti film 3 is dry-etched with a chlorine-based gas. After etching, the organic film 6 is removed by O 2 plasma as shown in FIG.

【0012】上記のいずれのドライエッチング工程も、
ECR(Electron Cyclotron Re
sonance)または、RIE(Reactive
Ion Etching)装置を用いる。上記のSOG
膜7のパターニングには、EB(Electron B
eam)による露光工程を用いてもよい。
In any of the above dry etching steps,
ECR (Electron Cyclotron Re
sonance) or RIE (Reactive)
Ion Etching) device is used. Above SOG
For patterning the film 7, EB (Electron B
An exposure process according to eam) may be used.

【0013】[0013]

【発明の効果】以上のように本発明の半導体装置の製造
方法によれば、ドライエッチング技術によってCu膜を
微細加工するに際し、SF6ガスまたはSH6ガスと、A
rガスとを用いてCu膜の反応層CuSを形成し、この
反応層をArガスにてエッチング除去する方法を繰り返
すことによってCu膜の加工をするものであり、常温で
もエッチングが可能であり、マスク材料にレジストまた
は、有機膜を使用することができる。
As described above, according to the method of manufacturing a semiconductor device of the present invention, when the Cu film is finely processed by the dry etching technique, SF 6 gas or SH 6 gas and A
The reaction layer CuS of the Cu film is formed by using r gas, and the Cu film is processed by repeating the method of etching and removing the reaction layer with Ar gas. A resist or an organic film can be used as the mask material.

【0014】また、エッチング室に300℃以上の基板
加熱ができる装備をもたない通常使用されているエッチ
ング装置でエッチングすることができる。
Further, the etching can be carried out by a commonly used etching apparatus having no equipment capable of heating the substrate at 300 ° C. or higher.

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

【図1】(a)〜(c)は、本発明の一実施例の前段の
工程を説明するための半導体チップの断面図である。
FIG. 1A to FIG. 1C are cross-sectional views of a semiconductor chip for explaining a former step of an embodiment of the present invention.

【図2】(d)〜(f)は、本発明の一実施例の後段の
工程を説明するための半導体チップの断面図である。
2 (d) to 2 (f) are cross-sectional views of a semiconductor chip for explaining a latter step of an embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1 Si基板 2 下地絶縁膜 3 Ti膜 4 TiN膜 5 Cu膜 6 有機膜 7 SOG膜 8 フォトレジスト膜 9 CuS層 1 Si Substrate 2 Base Insulating Film 3 Ti Film 4 TiN Film 5 Cu Film 6 Organic Film 7 SOG Film 8 Photoresist Film 9 CuS Layer

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 反応層の形成工程と、ドライエッチング
工程とを有し、Cu膜を微細加工する半導体装置の製造
方法であって、 反応層形成工程は、SF6ガスまたはSH6ガスを用いて
Cu膜の反応層を形成する工程であり、 ドライエッチング工程は、この反応層をArガスにてエ
ッチング除去する工程を繰り返すことによってCu膜を
加工する工程であ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, comprising a reaction layer forming step and a dry etching step, wherein a Cu film is finely processed, wherein the reaction layer forming step uses SF 6 gas or SH 6 gas. A step of forming a reaction layer of a Cu film, and the dry etching step is a step of processing the Cu film by repeating a step of removing the reaction layer by etching with Ar gas. Production method.
JP3848892A 1992-01-29 1992-01-29 Production of semiconductor device Pending JPH05206083A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3848892A JPH05206083A (en) 1992-01-29 1992-01-29 Production of semiconductor device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3848892A JPH05206083A (en) 1992-01-29 1992-01-29 Production of semiconductor device

Publications (1)

Publication Number Publication Date
JPH05206083A true JPH05206083A (en) 1993-08-13

Family

ID=12526649

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3848892A Pending JPH05206083A (en) 1992-01-29 1992-01-29 Production of semiconductor device

Country Status (1)

Country Link
JP (1) JPH05206083A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007533124A (en) * 2004-04-02 2007-11-15 アドバンスト・マイクロ・ディバイシズ・インコーポレイテッド In situ surface treatment for memory cell formation
JP2009111324A (en) * 2007-10-29 2009-05-21 Toshiba Corp Method of manufacturing semiconductor device
KR100902100B1 (en) * 2002-11-18 2009-06-09 주식회사 하이닉스반도체 Method for forming fine pattern in semiconductor device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100902100B1 (en) * 2002-11-18 2009-06-09 주식회사 하이닉스반도체 Method for forming fine pattern in semiconductor device
JP2007533124A (en) * 2004-04-02 2007-11-15 アドバンスト・マイクロ・ディバイシズ・インコーポレイテッド In situ surface treatment for memory cell formation
JP2009111324A (en) * 2007-10-29 2009-05-21 Toshiba Corp Method of manufacturing semiconductor device

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