JPH0284722A - Formation of wiring - Google Patents

Formation of wiring

Info

Publication number
JPH0284722A
JPH0284722A JP23695488A JP23695488A JPH0284722A JP H0284722 A JPH0284722 A JP H0284722A JP 23695488 A JP23695488 A JP 23695488A JP 23695488 A JP23695488 A JP 23695488A JP H0284722 A JPH0284722 A JP H0284722A
Authority
JP
Japan
Prior art keywords
wiring
layer
region
forming
photo 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.)
Pending
Application number
JP23695488A
Other languages
Japanese (ja)
Inventor
Michihiko Funekawa
舟川 道彦
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electronics 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 Matsushita Electronics Corp filed Critical Matsushita Electronics Corp
Priority to JP23695488A priority Critical patent/JPH0284722A/en
Publication of JPH0284722A publication Critical patent/JPH0284722A/en
Pending legal-status Critical Current

Links

Landscapes

  • Drying Of Semiconductors (AREA)
  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)

Abstract

PURPOSE:To obtain a forming method of wiring material whose section does not become an inversely tapered shape by arranging a photo resist film formed on a wiring formation region of material for forming a wiring, also on a separated region other than a practical wiring region. CONSTITUTION:In a semiconductor integrated circuit device, a photo resist film, which is formed on a wiring formation region 5 of material for forming a wiring by dry etching, is formed on also an isolated region 8 other than the practical wiring region 5. For example, in the case where the above- mentioned method is applied to the formation of two-layer Al, a vapor-deposited film of two-layer Al is firstly formed on a substrate, and from above said film, photo resist is spread on the whole surface of the two-layer Al. By using the two-layer Al mask exposure is performed, and the unnecessary two-layer Al is eliminated by dry etching. The photo resist on the two-layer Al formed in this process is formed also on the isolated region 8 other than the practical wiring region 5. By this setup, the ratio of the occupied area to the total area of a chip is made large.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は半導体集積装置における配線形成方法に関する
ものである。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for forming wiring in a semiconductor integrated device.

従来の技術 以下に従来の配線材料の形成方法について、アルミニュ
ウム(以下1と略す)配線を例にとって説明する。
BACKGROUND OF THE INVENTION A conventional method for forming wiring materials will be described below, taking aluminum (hereinafter abbreviated as 1) wiring as an example.

第2〜6図はAe配線の形成工程の一部を示すものであ
る。第2〜6図において、1はフォトレジスト、21t
Af!(7)蒸着膜、3は5i02層、4は保護膜であ
る。まず第2図のように、Ae蒸着膜上にフォトレジス
トを塗布し、その後露光を行う。すると第3図のように
Aeを残したい領域だけフォトレジストが残る。次にド
ライエツチングを行うことによって、第4図のようにフ
ォトレジストが残っている部分を除いたAeは除去され
る。ついで、第5図のように、エツチングの後、フォト
レジストを除去し、第6図のように保護膜を蒸着する。
2 to 6 show a part of the process of forming the Ae wiring. In Figures 2 to 6, 1 is photoresist, 21t
Af! (7) Deposited film, 3 is a 5i02 layer, and 4 is a protective film. First, as shown in FIG. 2, a photoresist is applied on the Ae deposited film, and then exposed. Then, as shown in FIG. 3, the photoresist remains only in the area where Ae is desired to be left. Next, by performing dry etching, the Ae is removed except for the portion where the photoresist remains, as shown in FIG. After etching, the photoresist is removed as shown in FIG. 5, and a protective film is deposited as shown in FIG.

以上がAe配線の場合を例にとった、配線の形成方法で
ある。
The above is a method for forming wiring, taking the case of Ae wiring as an example.

発明が解決しようとする課題 しかしながら、上記従来の方法では、ドライエツチング
の際、エツチャー(食刻ガス〉による侵食がフォトレジ
ストの配線材料にまで及んでしまい、その結果、配線材
料の断面が第3〜5図の点線に示すように逆テーパ状に
なってしまう。配線材料の断面がこのように逆テーパ状
になると、配線材料の上から蒸着させた保護膜が、逆テ
ーパの鋭角の部分で切やす(なってしまう。
Problems to be Solved by the Invention However, in the above-mentioned conventional method, during dry etching, erosion by the etcher (etching gas) extends to the wiring material of the photoresist, and as a result, the cross section of the wiring material becomes a third layer. It becomes a reverse taper shape as shown by the dotted line in Figure 5. When the cross section of the wiring material becomes reverse taper shape like this, the protective film deposited on top of the wiring material is stuck at the acute angle part of the reverse taper. Cut (become)

本発明は、上記従来の問題点を解決するもので、断面が
逆テーパ状にならない、配線材料の形成方法を提供する
ことを目的とする。
The present invention solves the above-mentioned conventional problems, and aims to provide a method for forming a wiring material in which the cross section does not become inversely tapered.

課題を解決するための手段 この目的を達成するために本発明の配線材料の形成方法
は、配線を形成する材料の配線形成領域上に設けられる
フォトレジスト膜が実際の配線領域以外の分離された領
域にも設けられる、という特徴を有している。
Means for Solving the Problems In order to achieve this object, the wiring material forming method of the present invention is such that the photoresist film provided on the wiring forming area of the wiring forming material is separated from the actual wiring area. It has the feature that it can also be provided in areas.

作用 この方法によって、露光後の配線材料上のレジスト面積
が太き(なり、ドライエツチングによって配線材料と共
に削られたフォトレジスト内のカーボン原子の濃度が大
きくなる。その結果、エツチング面におけるカーボン原
子の付着が多くなり、エツチングが抑制される。またト
ータルのエツチング時間もエツチング部分が少ないため
、実施前に比して短くなりエツチングを制御しやすくま
たオーバーエッチ量も抑制できる。
Effect: With this method, the area of the resist on the wiring material after exposure becomes thicker, and the concentration of carbon atoms in the photoresist that is removed together with the wiring material by dry etching increases.As a result, the concentration of carbon atoms on the etched surface increases. The amount of adhesion increases and etching is suppressed.Also, since the etched portion is small, the total etching time is shorter than before, making it easier to control etching and suppressing the amount of overetching.

実施例 以下本発明の一実施例について、図面を参照しながら説
明する。この実施例では、本発明を2層Aeの形成に適
用した。第1図はこの実施例における配線レイアウトを
示す。第1図において5はAe 、6は2層Aeと1層
Aeとのコンタクト、7は配線とは無関係な2層AQ 
、8は配線とは無関係な2層Aeを除去するマスク領域
を示す。また、第1図においてWは2層Aeの幅、Sは
2層Aeセパレーション、Nは2層Aeの凹部の刻み幅
を表し、Gは2層Aeのコンタクトに対するマージン、
Hは配線に無関係な2層Aeに対する、それを除去する
マスク領域のマージン、Iは配線に無関係なAeを除去
するマスク領域と配線領域の2層Aeとの間のセパレー
ションを示す。この実施例ではデザインルールとして、
W、S、G。
EXAMPLE An example of the present invention will be described below with reference to the drawings. In this example, the present invention was applied to the formation of a two-layer Ae. FIG. 1 shows the wiring layout in this embodiment. In Figure 1, 5 is Ae, 6 is the contact between 2nd layer Ae and 1st layer Ae, and 7 is 2nd layer AQ which is unrelated to wiring.
, 8 indicates a mask region from which the second layer Ae unrelated to the wiring is removed. In addition, in FIG. 1, W represents the width of the second layer Ae, S represents the separation of the second layer Ae, N represents the step width of the concave portion of the second layer Ae, and G represents the margin for the contact of the second layer Ae.
H indicates the margin of the mask region from which the second layer Ae unrelated to the wiring is removed, and I indicates the separation between the mask region from which the second layer Ae unrelated to the wiring is removed and the second layer Ae in the wiring region. In this example, the design rules are:
W, S, G.

H,Iの最小値をそれぞれ、3.0μm、4.0μm4
.0μm、2.0μm、4.0μm、4.0μmに設定
した。またこの実施例におけるレイアウトでは、1チッ
プ面積に対して、2層Ae領域全体の面積を34.5%
とした。
The minimum values of H and I are 3.0 μm and 4.0 μm4, respectively.
.. They were set to 0 μm, 2.0 μm, 4.0 μm, and 4.0 μm. Furthermore, in the layout of this embodiment, the area of the entire two-layer Ae region is 34.5% of the area of one chip.
And so.

つぎに、以上のようなレイアウトによる2層Ae配線の
形成方法について、その過程を説明する。
Next, the process of forming a two-layer Ae wiring using the layout as described above will be described.

まず基盤上に2層Aeの蒸着膜を形成し、その上からフ
ォトレジストを2層Aeの全面に塗布する。次に2層A
Qのマスクを用いて露光し、その後にドライエツチング
を行うことによって、不必要な2層Aeを除去する。
First, a two-layer Ae vapor deposition film is formed on a substrate, and a photoresist is applied over the entire surface of the two-layer Ae. Next, 2nd layer A
Unnecessary two-layer Ae is removed by exposing using a Q mask and then dry etching.

このドライエツチングの際には、不必要な2層Aeと同
時に、フォトレジストも同時に削られる。しかも、この
フォトレジストの面積がチップ全体の面積の34.5%
と、フォトレジストが実際の配線領域上にのみ設けられ
た場合に比して大きいので、フォトレジスト内のカーボ
ン原子の濃度もそれに応じて大きくなる。その結果、エ
ツチング面におけるカーボン原子の付着が多(なり、エ
ツチングが抑制される。
During this dry etching, the unnecessary two-layer Ae and the photoresist are etched at the same time. Moreover, the area of this photoresist is 34.5% of the entire chip area.
Since this is larger than when the photoresist is provided only on the actual wiring area, the concentration of carbon atoms in the photoresist is correspondingly large. As a result, more carbon atoms are attached to the etched surface, and etching is suppressed.

以上のように本実施例によれば、2層Ae上のフォトレ
ジストを、実際の配線領域以外の分離された領域にも設
けることによって、形成された2層Aeの断面が逆テー
パ状になるのを防ぐことができる。
As described above, according to this embodiment, by providing the photoresist on the two-layer Ae in a separate area other than the actual wiring area, the cross section of the two-layer Ae formed becomes inversely tapered. can be prevented.

なお、本実施例における実際の配線領域以外の2層Ae
を除去するためのマスクは、特に設けなくてもさしつか
えはない。
In addition, in this example, two layers Ae other than the actual wiring area
There is no problem even if a mask is not specially provided to remove the .

発明の効果 以上のように本発明は、配線を形成する材料の配線形成
領域上に設けられるフォトレジストが、実際の配線領域
以外の分離された領域にも設けられることにより、Ae
の断面が逆テーパ状になるのを防ぐことができる。そし
てそれによって、LS IIIJ:造における歩留りが
向上し、プロセス工程管理も容易になる。
Effects of the Invention As described above, the present invention has the advantage that the photoresist provided on the wiring forming region of the material for forming the wiring is also provided in a separated region other than the actual wiring region, thereby reducing Ae.
It is possible to prevent the cross section from becoming reversely tapered. This improves the yield in LS IIIJ manufacturing and facilitates process control.

【図面の簡単な説明】[Brief explanation of the drawing]

おけるAe配線の形成工程の1部を示す各断面図である
。 1・・・・・・フォトレジスト、2・・・・・・lの蒸
着膜、3・・・・・・5i02層、4・・・・・・保護
膜、5・・・・・・2層Ae(実際の配線領域)、6・
・・・・・2層Aeと1層Aeとのコンタクト、7・・
・・・・実際の配線領域以外の2層Ae 、8・・・・
・・7を除去するマスクの領域、W・・・・・・5の最
小幅、S・・・・・・5の最小セパレーション、N・・
・・・・5の最小ノツチ間隔、G・・・・・・6に対す
る5の最小マージン、H・・・・・・7に対する8の最
小マージン、■・・・・・・5と8との間の最小セパレ
ーション。
FIG. 3 is a cross-sectional view showing a part of the process of forming an Ae wiring in FIG. 1...Photoresist, 2...1 vapor deposited film, 3...5i02 layer, 4...protective film, 5...2 Layer Ae (actual wiring area), 6.
...Contact between 2nd layer Ae and 1st layer Ae, 7...
...2 layers Ae other than the actual wiring area, 8...
...Area of the mask to remove 7, W...Minimum width of 5, S...Minimum separation of 5, N...
...Minimum notch interval of 5, G...Minimum margin of 5 for 6, H...Minimum margin of 8 for 7, ■...Minimum margin of 8 for 5 and 8. Minimum separation between.

Claims (1)

【特許請求の範囲】[Claims] 半導体集積装置において、ドライエッチングにより配線
を形成する材料の配線形成領域上に設けられるフォトレ
ジスト膜が、実際の配線領域以外の分離された領域に設
けられたことを特徴とする配線形成方法。
A method for forming wiring in a semiconductor integrated device, characterized in that a photoresist film provided on a wiring forming region of a material for forming wiring by dry etching is provided in a separated region other than the actual wiring region.
JP23695488A 1988-09-21 1988-09-21 Formation of wiring Pending JPH0284722A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23695488A JPH0284722A (en) 1988-09-21 1988-09-21 Formation of wiring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23695488A JPH0284722A (en) 1988-09-21 1988-09-21 Formation of wiring

Publications (1)

Publication Number Publication Date
JPH0284722A true JPH0284722A (en) 1990-03-26

Family

ID=17008222

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23695488A Pending JPH0284722A (en) 1988-09-21 1988-09-21 Formation of wiring

Country Status (1)

Country Link
JP (1) JPH0284722A (en)

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