JPH06204344A - Manufacture of semiconductor device - Google Patents

Manufacture of semiconductor device

Info

Publication number
JPH06204344A
JPH06204344A JP35902792A JP35902792A JPH06204344A JP H06204344 A JPH06204344 A JP H06204344A JP 35902792 A JP35902792 A JP 35902792A JP 35902792 A JP35902792 A JP 35902792A JP H06204344 A JPH06204344 A JP H06204344A
Authority
JP
Japan
Prior art keywords
hole
layer
polyimide resin
coupler
film
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
JP35902792A
Other languages
Japanese (ja)
Inventor
Nobuyuki Saino
伸之 斎野
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.)
Hitachi Denshi KK
Original Assignee
Hitachi Denshi 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 Hitachi Denshi KK filed Critical Hitachi Denshi KK
Priority to JP35902792A priority Critical patent/JPH06204344A/en
Publication of JPH06204344A publication Critical patent/JPH06204344A/en
Pending legal-status Critical Current

Links

Landscapes

  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)

Abstract

PURPOSE:To enable a first aluminum wiring layer and a second aluminum wiring layer by a method wherein polyimide resin of a through-hole forming part is etched, and then an aluminum oxide film is etched for the formation of a perfect through-hole. CONSTITUTION:A first aluminum wiring layer 3 is formed on a semiconductor substrate 1, and an aluminum oxide film 5 is formed on a part of the aluminum wiring layer 3 where a through-hole is provided. Then, a coupler 4 is formed, a polyimide resin film 6 is provided, and then a through-hole is bored. Especially, when a through-hole is provided, the polyimide resin film 6 is etched, the coupler 4 is removed, and then the aluminum oxide film 5 is etched. Next, the coupler is removed from a region where a through-hole is bored, the aluminum oxide film 4 is removed, and lastly a second aluminum wiring 8 is provided.

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に
係り,特に多層配線の製造方法に関する。
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 manufacturing a multi-layer wiring.

【0002】[0002]

【従来の技術】半導体集積回路が大規模化すると,各素
子間の接続長は増大し,配線領域の面積がチップ面積の
多くの部分を占めるため,同一面積のチップに収容でき
るゲート数を増加させるには配線領域の面積を小さくす
る必要がある。そのため多層配線技術が採用されてい
る。従来の多層配線技術を図2の二層配線を形成する工
程の断面図により説明する。まず半導体基板1の上面に
あるSi2膜2上に第一層のアルミニウム配線3を形成
し図2(a),その上にカップラー4を形成し図2
(b),ポリイミド系樹脂膜6を形成する図2(c)。
層間絶縁膜にポリイミド系樹脂膜6を使用して多層配線
を行う場合,Si2膜2とポリイミド系樹脂膜6の接着
性が悪いため,Si2膜2とポリイミド系樹脂膜6の間
にカップラー4を形成することにより,Si2膜2とポ
リイミド系樹脂膜6の接着性を向上させている。その後
ポリイミド系樹脂膜6にスルーホールを形成し図2
(d),ホトレジスト膜7を取り除き図2(e),カッ
プラー4を取り除く図2(f)。しかしスルーホールを
形成する時に,ポリイミド系樹脂膜6とカップラー4ま
たはポリイミド系樹脂膜6と第一層のアルミニウム配線
3の接触抵抗が大きいこともあり,ポリイミド系樹脂膜
6がエッチングされきれずに残ってしまう。その上に第
二層のアルミニウム配線8を形成図2(g)しても,第
一層のアルミニウム配線3と第二層のアルミニウム配線
8は,例えばスルーホールが約10μm□以上なければ
導通しにくい。
2. Description of the Related Art As a semiconductor integrated circuit increases in size, the connection length between elements increases, and the area of the wiring region occupies a large part of the chip area. To do so, it is necessary to reduce the area of the wiring region. Therefore, multi-layer wiring technology is adopted. A conventional multi-layer wiring technique will be described with reference to a sectional view of the step of forming the two-layer wiring in FIG. First S i O 2 film is formed on the 2 aluminum wires 3 of the first layer Figure 2 on the top of the semiconductor substrate 1 (a), to form a coupler 4 thereon Figure 2
(B), FIG. 2 (c) in which the polyimide resin film 6 is formed.
When performing multi-layer wiring using a polyimide resin film 6 in the interlayer insulating film, since adhesion of S i O 2 film 2 and the polyimide resin film 6 is poor, S i O 2 film 2 and the polyimide resin film 6 by forming the coupler 4 between, thereby improving the adhesion of S i O 2 film 2 and the polyimide resin film 6. After that, a through hole is formed in the polyimide resin film 6 and then, as shown in FIG.
(D), FIG. 2 (e) in which the photoresist film 7 is removed, and FIG. 2 (f) in which the coupler 4 is removed. However, when the through hole is formed, the contact resistance between the polyimide resin film 6 and the coupler 4 or the polyimide resin film 6 and the aluminum wiring 3 of the first layer may be large, so that the polyimide resin film 6 cannot be completely etched. I will remain. Even if the second layer aluminum wiring 8 is formed on it, the first layer aluminum wiring 3 and the second layer aluminum wiring 8 are electrically connected unless the through hole is about 10 μm square or more. Hateful.

【0003】[0003]

【発明が解決しようとする課題】従来技術において,ポ
リイミド系樹脂膜にスルーホールを形成するのにポリイ
ミド系樹脂膜が完全にはエッチングされず,例えばスル
ーホールの大きさが約10μm□以上でないとマスク通
りに形成できないという欠点がある。本発明はこれらの
欠点を解決するため,第一層アルミニウム配線上のスル
ーホール形成部分でポリイミド系樹脂膜及びカップラー
を完全に取り除き,第一層のアルミニウム配線と第二層
のアルミニウム配線を導通しやすくすることを目的とす
る。
In the prior art, the polyimide resin film is not completely etched to form a through hole in the polyimide resin film, and for example, the size of the through hole must be about 10 μm □ or more. It has a drawback that it cannot be formed according to the mask. In order to solve these drawbacks, the present invention completely removes the polyimide resin film and the coupler at the through hole forming portion on the first layer aluminum wiring, and electrically connects the first layer aluminum wiring and the second layer aluminum wiring. The purpose is to make it easier.

【0004】[0004]

【課題を解決するための手段】本発明は上記の目的を達
成するのに,スルーホール形成部分のポリイミド系樹脂
膜とカップラーを完全に取り除くために,スルーホール
形成部分の第一層のアルミニウム配線とカップラーの間
にアルミニウム酸化物膜を形成し,スルーホールを形成
する時,ポリイミド系樹脂膜をエッチングしカップラー
を取り除いてからアルミニウム酸化物膜をエッチングす
るようにしたものである。
In order to achieve the above-mentioned object, the present invention is intended to completely remove the polyimide resin film and the coupler in the through hole forming portion so that the aluminum wiring of the first layer in the through hole forming portion is removed. The aluminum oxide film is formed between the coupler and the coupler, and when the through hole is formed, the polyimide resin film is etched to remove the coupler and then the aluminum oxide film is etched.

【0005】[0005]

【作用】本発明の作用について説明するとアルミニウム
酸化物膜は非常に膜質が弱くエッチレートもアルミニウ
ムにくらべて速い。例えばNH4F:HF=6:1液に
10秒浸せば第一層のアルミニウム配線をエッチングす
ることなくアルミニウム酸化物膜をエッチングすること
ができ,同時にスルーホール形成部分のポリイミド系樹
脂膜とカップラーを完全に取り除くことができる。その
結果第一層のアルミニウム配線と第二層のアルミニウム
配線は導通しやすくなる。
The function of the present invention will be described. The aluminum oxide film has a very weak film quality and an etching rate faster than that of aluminum. For example, by immersing in NH 4 F: HF = 6: 1 solution for 10 seconds, the aluminum oxide film can be etched without etching the aluminum wiring of the first layer, and at the same time the polyimide resin film and the coupler of the through hole formation portion Can be completely removed. As a result, the first-layer aluminum wiring and the second-layer aluminum wiring are likely to be electrically connected.

【0006】[0006]

【実施例】以下この発明の一実施例を,図1に示す二層
配線を形成する半導体装置の断面図により説明する。ま
ず半導体基板1の上面にSi2膜2,第一層のアルミニ
ウム配線3を形成する図1(a)。その上面にアルミニ
ウム酸化物膜5を形成する図1(b)。この手段として
は公知の陽極酸化または化学化成法等を用いるのが有利
である。その上面にSi2膜2とポリイミド系樹脂膜6
の接着性を良くするためのカップラー4を形成する図1
(c)。次にポリイミド系樹脂膜6を形成し,その上に
スルーホールを形成するためにホトレジスト膜7を形成
する図1(d)。次にスルーホールを形成するためにポ
リイミド系樹脂膜6のエッチングを行う図1(e)。そ
の後にホトレジスト膜7を取り除き図1(f),次にカ
ップラーを取り除き,この後アルミニウム酸化物膜のエ
ッチングを行う図1(g)。そして最後に第二層のアル
ミニウム配線8を形成する図1(h)。本実施例ではス
ルーホール形成部分の第一層のアルミニウム配線上のポ
リイミド系樹脂膜とカップラーを完全に取り除くため
に,スルーホール形成部分の第一層のアルミニウム配線
とカップラーの間にアルミニウム酸化物膜を形成する。
そしてスルーホールを形成する時最後にアルミニウム酸
化物膜のエッチングを行う。この工程を加えることによ
り,マスク通りのスルーホールが形成しやすくなり,第
一層のアルミニウム配線3と,第二層のアルミニウム配
線8は導通しやすくなる。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to a sectional view of a semiconductor device forming a two-layer wiring shown in FIG. S i O 2 film 2 is first on the upper surface of the semiconductor substrate 1, FIG. 1 to form the aluminum wiring 3 of the first layer (a). An aluminum oxide film 5 is formed on the upper surface of FIG. As this means, it is advantageous to use a known anodic oxidation or chemical conversion method. S i O 2 film 2 and the polyimide resin film 6 on the upper surface
1 to form a coupler 4 for improving the adhesiveness of
(C). Next, a polyimide resin film 6 is formed, and a photoresist film 7 is formed thereon to form a through hole, as shown in FIG. 1D. Next, the polyimide resin film 6 is etched to form through holes, as shown in FIG. After that, the photoresist film 7 is removed, as shown in FIG. 1 (f), and then the coupler is removed, after which the aluminum oxide film is etched as shown in FIG. 1 (g). Finally, the aluminum wiring 8 of the second layer is formed as shown in FIG. In this embodiment, in order to completely remove the polyimide resin film and the coupler on the first layer aluminum wiring in the through hole forming portion, an aluminum oxide film is formed between the first layer aluminum wiring and the coupler in the through hole forming portion. To form.
Then, when forming the through hole, the aluminum oxide film is finally etched. By adding this step, it is easy to form a through hole according to the mask, and it is easy for the first layer aluminum wiring 3 and the second layer aluminum wiring 8 to be electrically connected.

【0007】[0007]

【発明の効果】本発明は以上説明したように,第一層の
アルミニウム配線上のスルーホール形成部分にアルミニ
ウム酸化物膜を形成することにより,これまで完全には
形成できなかったスルーホールが形成できるようにな
る。そしてスルーホールが10μm□以下で,例えば5
μm□であっても第一層のアルミニウム配線と第二層の
アルミニウム配線を導通させることができるようにな
る。
As described above, according to the present invention, by forming an aluminum oxide film in a portion where a through hole is formed on the first layer aluminum wiring, a through hole which could not be formed completely until now is formed. become able to. If the through hole is 10 μm □ or less, for example, 5
Even if the thickness is μm, the aluminum wiring of the first layer and the aluminum wiring of the second layer can be electrically connected.

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

【図1】本発明である半導体装置の製造方法を示す断面
図。
FIG. 1 is a sectional view showing a method of manufacturing a semiconductor device according to the present invention.

【図2】従来例による半導体装置の製造方法を示す断面
図である。
FIG. 2 is a cross-sectional view showing a method of manufacturing a semiconductor device according to a conventional example.

【符号の説明】[Explanation of symbols]

1 半導体基板 2 Si2膜 3 第一層のアルミニウム配線 4 カップラー 5 アルミニウム酸化物膜 6 ポリイミド系樹脂膜 7 ホトレジスト膜 8 第二層のアルミニウム配線1 semiconductor substrate 2 S i O 2 film 3 first layer aluminum interconnection 4 coupler 5 aluminum oxide film 6 aluminum wiring polyimide resin film 7 photoresist film 8 second layer of

Claims (1)

【特許請求の範囲】[Claims] 初めに第一層のアルミニウム配線を形成する工程,次に
第一層のアルミニウム配線上のスルーホール形成部分に
アルミニウム酸化物膜を形成する工程,次にカップラー
を形成する工程,次にポリイミド系樹脂膜を形成し,そ
の後スルーホールを形成する工程,次にスルーホール形
成部分のカップラーを除去し,アルミニウム酸化物膜を
除去する工程,最後に第二層のアルミニウム配線を形成
する工程から成ることを特徴とする多層配線をもちいた
半導体装置の製造方法。
First, the step of forming the first layer aluminum wiring, then the step of forming an aluminum oxide film in the through hole formation portion on the first layer aluminum wiring, then the step of forming the coupler, then the polyimide resin A step of forming a film and then forming a through hole, a step of removing the coupler in the through hole forming portion, a step of removing the aluminum oxide film, and a step of finally forming a second layer of aluminum wiring. A method for manufacturing a semiconductor device using a characteristic multilayer wiring.
JP35902792A 1992-12-25 1992-12-25 Manufacture of semiconductor device Pending JPH06204344A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP35902792A JPH06204344A (en) 1992-12-25 1992-12-25 Manufacture of semiconductor device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP35902792A JPH06204344A (en) 1992-12-25 1992-12-25 Manufacture of semiconductor device

Publications (1)

Publication Number Publication Date
JPH06204344A true JPH06204344A (en) 1994-07-22

Family

ID=18462369

Family Applications (1)

Application Number Title Priority Date Filing Date
JP35902792A Pending JPH06204344A (en) 1992-12-25 1992-12-25 Manufacture of semiconductor device

Country Status (1)

Country Link
JP (1) JPH06204344A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100207271A1 (en) * 2009-02-19 2010-08-19 Toshihiko Omi Semiconductor device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100207271A1 (en) * 2009-02-19 2010-08-19 Toshihiko Omi Semiconductor device
CN101814476A (en) * 2009-02-19 2010-08-25 精工电子有限公司 Semiconductor device

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