【0001】0001
【産業上の利用分野】本発明は,半導体装置の多層配線
の形成方法に関する。近年のコンピュータシステムの高
速化の要求に伴い,半導体集積回路の高集積化,高速化
が益々要求されている。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming multilayer wiring in a semiconductor device. With the recent demand for higher speed computer systems, there is an increasing demand for higher integration and higher speed semiconductor integrated circuits.
【0002】このため,半導体素子の微細化のみならず
,配線の微細化,多層化が益々重要となってきている。この様な多層配線を実現するには,層間絶縁膜の平坦化
技術と,多層配線の配線層間を接続する微細な接続孔に
配線を形成する技術の開発が特に重要である。For this reason, not only the miniaturization of semiconductor elements, but also the miniaturization and multilayering of interconnections are becoming increasingly important. In order to realize such multilayer wiring, it is particularly important to develop techniques for flattening interlayer insulating films and technology for forming wiring in minute contact holes that connect wiring layers in multilayer wiring.
【0003】これによって,多層配線の信頼性を高めて
やる必要がある。[0003] Accordingly, it is necessary to improve the reliability of multilayer wiring.
【0004】0004
【従来の技術】従来の多層配線の形成においては,層間
絶縁膜の平坦化法として,SOG塗布法,有機膜塗布法
,エッチバック法等が用いられている。2. Description of the Related Art In the conventional formation of multilayer interconnections, SOG coating, organic film coating, etch-back, and the like are used as methods for planarizing interlayer insulating films.
【0005】この中で,ポリシロキサン,シリコーン樹
脂等の塗布による平坦化は工程が簡単であり,平坦性に
優れている。配線層間の接続孔の断面形状は,微細化と
共に急峻でアスペクト比(深さに対する直径の比)の大
きなものとなってくる。Among these, flattening by coating polysiloxane, silicone resin, etc. is a simple process and has excellent flatness. The cross-sectional shape of connection holes between wiring layers becomes steeper and has a larger aspect ratio (ratio of diameter to depth) with miniaturization.
【0006】そのため,従来のスパッタ法で形成した配
線層は,深い接続孔での配線金属膜の被覆性が悪いため
,配線間の接続不良が重大な問題になってきている。この問題を解決できる多層配線技術には,微細接続孔に
金属を選択的に埋め込む方法が有望である。[0006] For this reason, wiring layers formed by conventional sputtering methods have poor coverage of wiring metal films in deep connection holes, and poor connections between wirings have become a serious problem. A promising multilayer interconnection technology that can solve this problem is the method of selectively embedding metal into microscopic contact holes.
【0007】現在のこの技術の主流は,原料ガスとして
六弗化タングステン(WF6), 還元剤として水素
(H2)やシラン(SiH4)等を使用したタングステ
ン(W)の選択CVD技術である。[0007] The current mainstream of this technology is a tungsten (W) selective CVD technology using tungsten hexafluoride (WF6) as a raw material gas and hydrogen (H2), silane (SiH4), etc. as a reducing agent.
【0008】ポリシロキサン,シリコーン樹脂等の塗布
による層間絶縁膜の平坦化と,Wの選択CVD法による
配線接続孔への配線形成を組み合わせた多層配線の形成
は重要である。[0008] It is important to form multilayer wiring by combining flattening of an interlayer insulating film by applying polysiloxane, silicone resin, etc., and forming wiring into wiring connection holes by selective W CVD.
【0009】[0009]
【発明が解決しようとする課題】塗布法では,下層配線
パターンの粗密,または寸法の大小により,下層配線上
の塗布膜厚が異なるため,弗化炭素系の反応ガスを用い
た反応性イオンエッチング(RIE)法で接続孔を開口
した場合,パターン密度が低い領域の接続孔は長時間オ
ーバーエッチングされる。[Problem to be solved by the invention] In the coating method, the thickness of the coating film on the lower wiring pattern varies depending on the density or size of the lower wiring pattern, so reactive ion etching using a carbon fluoride-based reactive gas is required. When connecting holes are opened using the (RIE) method, the connecting holes in areas with low pattern density are over-etched for a long time.
【0010】そのため接続孔底面に露出した下層配線表
面上に,炭素(C),水素(H),弗素(F)原子等か
らなる残留物が残る。この様な残留物は,通常の酸素(
O2)プラズマ処理や化学処理では容易に除去できない
。Therefore, residues consisting of carbon (C), hydrogen (H), fluorine (F) atoms, etc. remain on the surface of the lower layer wiring exposed at the bottom of the connection hole. Such residues are produced by normal oxygen (
O2) cannot be easily removed by plasma treatment or chemical treatment.
【0011】そのため,この後の選択CVDにより接続
孔へWを埋め込む工程で前記残留物が残っている配線金
属上の接続孔には,Wが安定に成長しないという問題が
あった。[0011] Therefore, in the subsequent step of burying W into the contact hole by selective CVD, W does not grow stably in the contact hole on the wiring metal where the residue remains.
【0012】さらに,上記残留物の少ない条件でRIE
を行った場合には,下層配線の金属がスパッタされて接
続孔の側壁部に付着するため,Wが側壁部に成長してし
まうという問題があった。Furthermore, RIE is performed under the above-mentioned conditions with less residue.
If this is done, the metal of the lower layer wiring is sputtered and adheres to the side wall of the connection hole, resulting in the problem that W grows on the side wall.
【0013】本発明は,このような問題点に鑑みてなさ
れたものであって,特に,塗布法による層間絶縁膜の平
坦化と,金属の選択CVD法による配線接続孔への金属
埋め込みを確実に行うことにより,配線の信頼性を向上
させることができる多層配線の形成方法を提供すること
を目的としている。[0013] The present invention was made in view of these problems, and in particular, it is possible to flatten an interlayer insulating film by a coating method, and to ensure that metal is filled into wiring connection holes by a metal selective CVD method. The purpose of the present invention is to provide a method for forming multilayer wiring that can improve the reliability of the wiring by performing the following steps.
【0014】[0014]
【課題を解決するための手段】図1は本発明の原理説明
図である。図において,1は半導体基板,2は第1の金
属配線,3は第1の絶縁膜,4は第2の絶縁膜,5は第
3の絶縁膜,6は接続孔,7は接続用金属,8は第2の
金属配線である。[Means for Solving the Problems] FIG. 1 is a diagram illustrating the principle of the present invention. In the figure, 1 is a semiconductor substrate, 2 is a first metal wiring, 3 is a first insulating film, 4 is a second insulating film, 5 is a third insulating film, 6 is a connection hole, and 7 is a connection metal. , 8 are second metal wirings.
【0015】前記の問題点は,本発明の如く,半導体基
板1上に第1の金属配線2を形成する工程と,該第1の
金属配線を覆って,該半導体基板1上に第1の絶縁膜3
を形成する工程と, 該第1の絶縁膜3の上に, 第2
の絶縁膜4を形成する工程と, 該第2の絶縁膜4の上
に, 第3の絶縁膜5を形成する工程と, 該第3の絶
縁膜5のみを選択的に貫通して,該第1の金属配線2上
に金属配線接続用の接続孔6を形成する工程と, 該接
続孔6底面に露出した該第2の絶縁膜4,および該第3
の絶縁膜5を除去して, 該第1の金属配線2を露出さ
せる工程と, 該接続孔6に該第1の金属配線2に対す
る接続用金属7を選択的に埋め込む工程と, 該接続孔
6を覆って, 該第3の絶縁膜5上に該第2の金属配線
8を形成する工程とを含むことにより解決する。The above-mentioned problems arise in the step of forming the first metal wiring 2 on the semiconductor substrate 1 and the step of forming the first metal wiring 2 on the semiconductor substrate 1, covering the first metal wiring, as in the present invention. Insulating film 3
a step of forming a second insulating film 3 on the first insulating film 3;
a step of forming an insulating film 4 on the second insulating film 4, a step of forming a third insulating film 5 on the second insulating film 4, and a step of selectively penetrating only the third insulating film 5 to A step of forming a contact hole 6 for connecting the metal wire on the first metal wire 2, the second insulating film 4 exposed on the bottom surface of the contact hole 6, and the third
a step of removing the insulating film 5 of the insulating film 5 to expose the first metal wiring 2; a step of selectively embedding a connecting metal 7 for the first metal wiring 2 in the connection hole 6; 6 and forming the second metal wiring 8 on the third insulating film 5.
【0016】[0016]
【作用】上記のように,本発明によれば,図1に示すよ
うに,金属配線間の層間絶縁膜を三層の絶縁膜で構成し
ている。As described above, according to the present invention, as shown in FIG. 1, the interlayer insulating film between the metal wirings is composed of three layers of insulating films.
【0017】下層の絶縁膜は,下層金属配線への密着性
の良い絶縁膜である。中間層の絶縁膜は,反応性イオン
エッチング法で上層の絶縁膜を選択的にエッチングして
下層配線上に配線接続孔を開口する際のエッチングの停
止層である。The lower layer insulating film is an insulating film that has good adhesion to the lower layer metal wiring. The intermediate layer insulating film is an etching stop layer when the upper layer insulating film is selectively etched using a reactive ion etching method to open a wiring connection hole on the lower layer wiring.
【0018】そのため,金属配線間の層間絶縁膜を構成
している上層の絶縁膜の厚さが半導体基板上の金属配線
上で大きく異なっていても,下層配線の金属表面が反応
性イオンに直接曝されることがない。Therefore, even if the thickness of the upper insulating film constituting the interlayer insulating film between metal wirings varies greatly on the metal wiring on the semiconductor substrate, the metal surface of the lower wiring is directly exposed to reactive ions. Not exposed.
【0019】また,エッチングの停止層である中間層の
絶縁膜の表面にカーボン系の残留物が生じても,中間層
と下層の絶縁膜を除去する際に,容易に除去することが
できる。Furthermore, even if carbon-based residue is generated on the surface of the intermediate layer insulating film, which is an etching stop layer, it can be easily removed when removing the intermediate layer and the lower layer insulating film.
【0020】さらに,中間層と下層の絶縁膜を除去する
際に,下層配線の金属表面に影響を与えない方法で除去
すれば,反応性イオンエッチング条件に無関係に同一の
金属表面状態が得られるため,開口した配線接続孔に選
択CVD法により金属を安定,かつ再現性良く埋め込む
ことができる。Furthermore, when removing the intermediate layer and lower layer insulating film, if the removal is done in a manner that does not affect the metal surface of the lower layer wiring, the same metal surface condition can be obtained regardless of the reactive ion etching conditions. Therefore, it is possible to stably and reproducibly embed metal into the opened wiring connection hole by the selective CVD method.
【0021】[0021]
【実施例】図2,図3は本発明の一実施例の工程順模式
断面図である。図において,9はSi基板,10はSi
O2膜, 11はTiW/Au/TiW膜, 12はS
iO2膜, 13はAl2O3 膜, 14はPMSS
樹脂膜, 15はSiO2膜, 16は接続孔, 17
はW膜,18はTiW/Au膜である。Embodiment FIGS. 2 and 3 are schematic sectional views in order of steps of an embodiment of the present invention. In the figure, 9 is a Si substrate, 10 is a Si substrate
O2 film, 11 is TiW/Au/TiW film, 12 is S
iO2 film, 13 is Al2O3 film, 14 is PMSS
Resin film, 15 is SiO2 film, 16 is connection hole, 17
18 is a W film, and 18 is a TiW/Au film.
【0022】図2により,工程順に本発明の一実施例を
説明する。図2(a)に示すように,半導体基板,例え
ば,シリコン(Si)基板9上にプラズマCVD法によ
り,二酸化シリコン(SiO2)膜10を1μmの厚さ
に被覆し,その上にチタン・タングステン(TiW)
を30nm, 金(Au)を700nm, TiWを3
0nmの厚さに連続してスパッタ法により積層し, パ
ターニングして第1層目の金属配線としてのTiW/A
u/TiW膜11を形成する。An embodiment of the present invention will be explained in order of steps with reference to FIG. As shown in FIG. 2(a), a silicon dioxide (SiO2) film 10 with a thickness of 1 μm is coated on a semiconductor substrate, for example, a silicon (Si) substrate 9, by the plasma CVD method, and titanium and tungsten are coated on the silicon dioxide (SiO2) film 10 to a thickness of 1 μm. (TiW)
30 nm, gold (Au) 700 nm, TiW 3
TiW/A is laminated continuously to a thickness of 0 nm by sputtering and patterned to form the first layer of metal wiring.
A u/TiW film 11 is formed.
【0023】図2(b)に示すように,例えば,イオン
ビームアシスト蒸着法,またはスパッタ法により,Si
O2膜12を20nm, 酸化アルミニウム(Al2O
3) 膜13を5nmの厚さに連続して積層蒸着する。As shown in FIG. 2(b), for example, Si is deposited by ion beam assisted vapor deposition or sputtering.
The O2 film 12 is 20 nm thick and made of aluminum oxide (Al2O
3) Continuously deposit the film 13 to a thickness of 5 nm.
【0024】図2(c)に示すように,例えば,シリコ
ーン樹脂の一種である日本ゼオン社製のシリル化ポリメ
チルシルセスキオキサン(PMSS)樹脂膜14をスピ
ンコート法により 1.5μmの厚さに塗布し, 35
0℃で1時間加熱して硬化する。As shown in FIG. 2(c), for example, a silylated polymethylsilsesquioxane (PMSS) resin film 14 manufactured by Nippon Zeon Co., Ltd., which is a type of silicone resin, is deposited to a thickness of 1.5 μm by spin coating. 35
It is cured by heating at 0° C. for 1 hour.
【0025】続いて,例えば,イオンビームアシスト蒸
着法により,SiO2膜15を 200nmの厚さに形
成する。続いて,図2(d)に示すように,レジストマ
スクを用いて,RIE法により,弗化炭素系(CHF3
, CF4, C2F6) 或いは六弗化硫黄(SF6
) のガスとヘリウム(He)の混合ガスを用いて,
SiO2膜15, 及びPMSS樹脂膜14をエッチン
グして,接続孔16を開口する。Subsequently, the SiO2 film 15 is formed to a thickness of 200 nm by, for example, ion beam assisted vapor deposition. Next, as shown in Figure 2(d), using a resist mask, carbon fluoride (CHF3) was applied by RIE method.
, CF4, C2F6) or sulfur hexafluoride (SF6
) and helium (He),
The SiO2 film 15 and the PMSS resin film 14 are etched to open connection holes 16.
【0026】この場合, 前記RIEにより Al20
3膜13は殆どエッチングされないため, 200%程
度オーバーエッチングしても, Al203膜13が
露出した状態でエッチングが停止する。[0026] In this case, by the RIE, Al20
Since the Al203 film 13 is hardly etched, even if the Al203 film 13 is over-etched by about 200%, the etching will stop with the Al203 film 13 exposed.
【0027】図3(e)に示すように,例えば,希釈弗
化水素水溶液,または緩衝弗化水素水溶液により,Al
203膜13,及びSiO2膜12を除去し, 第1層
目の金属配線の TiW表面を露出する。As shown in FIG. 3(e), for example, Al
The 203 film 13 and the SiO2 film 12 are removed to expose the TiW surface of the first layer metal wiring.
【0028】図3(f)に示すように,減圧下の反応容
器中でSi基板9を 260℃に加熱して, WF6
とSiH4とH2の混合ガスを用いて, 接続孔16内
にW17を選択的に堆積する。その後, 図3(g)に
示すように,TiW を30nm, Auを 700n
mの厚さにスパッタ法により連続して積層蒸着し, パ
ターニングして第2の金属配線,TiW/Au膜18を
形成する。As shown in FIG. 3(f), the Si substrate 9 is heated to 260° C. in a reaction vessel under reduced pressure, and then heated to WF6.
W17 is selectively deposited in the connection hole 16 using a mixed gas of SiH4 and H2. After that, as shown in Figure 3(g), TiW was 30nm thick and Au was 700nm thick.
The TiW/Au film 18, which is a second metal wiring, is formed by successively depositing layers to a thickness of m by sputtering and patterning.
【0029】この工程を繰り返せば,三層以上の多層配
線形成ができる。前記実施例では,絶縁膜14としてP
MSS樹脂を用いた場合を例示したが, ポリシロキサ
ンなどのSOG膜を適用することもできる。By repeating this process, multilayer wiring of three or more layers can be formed. In the above embodiment, P is used as the insulating film 14.
Although the case where MSS resin is used is shown as an example, it is also possible to apply an SOG film such as polysiloxane.
【0030】絶縁膜14,15 として一層の無機膜を
用いた場合にも適用できることはいうまでもない。また
,前記実施例では,PMSS樹脂膜の下の絶縁膜をSi
O2/Al203膜としたが,SiO2/Al203/
SiO2膜としても良い。It goes without saying that the invention can also be applied to the case where a single layer of inorganic film is used as the insulating films 14 and 15. Furthermore, in the above embodiment, the insulating film under the PMSS resin film is made of Si.
O2/Al203 film was used, but SiO2/Al203/
It may also be a SiO2 film.
【0031】[0031]
【発明の効果】以上説明したように, 本発明によれば
, 金属配線間の層間接続孔を開口する際に, 層間絶
縁膜の下層配線付近にエッチングの停止層を設けている
ため, 下層配線上の層間絶縁膜の厚みが半導体基板上
で異なっていても, 配線金属表面に影響を与えない。[Effects of the Invention] As explained above, according to the present invention, when opening an interlayer connection hole between metal wirings, an etching stop layer is provided near the lower wiring of the interlayer insulating film. Even if the thickness of the upper interlayer insulating film differs on the semiconductor substrate, it will not affect the wiring metal surface.
【0032】従って, 接続孔に露出した金属表面は半
導体基板上に亙って汚染のない同一の表面状態が得られ
るため, 開口した配線接続孔に選択CVD 法により
接続用金属を安定, かつ再現性良く形成することがで
き, 多層配線の信頼性の向上に寄与するところが大き
い。[0032] Therefore, since the metal surface exposed in the connection hole can have the same surface condition free of contamination over the entire semiconductor substrate, it is possible to stably and reproduce the connection metal in the opened wiring connection hole by selective CVD. It can be formed with good performance and greatly contributes to improving the reliability of multilayer wiring.
【図1】 本発明の原理説明図[Figure 1] Diagram explaining the principle of the present invention
【図2】 本発明の一実施例の工程順模式断面図(そ
の1)[Fig. 2] Schematic sectional view of the process order of one embodiment of the present invention (Part 1)
【図3】 本発明の一実施例の工程順模式断面図(そ
の2)[Fig. 3] Schematic cross-sectional view of the process order of one embodiment of the present invention (Part 2)
1 半導体基板2 第1の金属配線3 第1の絶縁膜4 第2の絶縁膜5 第3の絶縁膜6 接続孔7 接続用金属8 第2の金属配線9 Si基板10 SiO2膜11 TiW/Au/TiW膜12 SiO2膜13 Al2O3 膜14 PMSS樹脂膜15 SiO2膜16 接続孔17 W膜18 TiW/Au膜1 Semiconductor substrate2 First metal wiring3 First insulating film4 Second insulating film5 Third insulating film6 Connection hole7 Connection metal8 Second metal wiring9 Si substrate10 SiO2 film11 TiW/Au/TiW film12 SiO2 film13 Al2O3 film14 PMSS resin film15 SiO2 film16 Connection hole17 W film18 TiW/Au film
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8281491AJPH04316351A (en) | 1991-04-16 | 1991-04-16 | Manufacture of semiconductor device |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8281491AJPH04316351A (en) | 1991-04-16 | 1991-04-16 | Manufacture of semiconductor device |
| Publication Number | Publication Date |
|---|---|
| JPH04316351Atrue JPH04316351A (en) | 1992-11-06 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8281491AWithdrawnJPH04316351A (en) | 1991-04-16 | 1991-04-16 | Manufacture of semiconductor device |
| Country | Link |
|---|---|
| JP (1) | JPH04316351A (en) |
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| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed | Free format text:JAPANESE INTERMEDIATE CODE: A300 Effective date:19980711 |