JP4216226B2 - 半導体集積回路装置 - Google Patents
半導体集積回路装置 Download PDFInfo
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- JP4216226B2 JP4216226B2 JP2004155476A JP2004155476A JP4216226B2 JP 4216226 B2 JP4216226 B2 JP 4216226B2 JP 2004155476 A JP2004155476 A JP 2004155476A JP 2004155476 A JP2004155476 A JP 2004155476A JP 4216226 B2 JP4216226 B2 JP 4216226B2
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Description
(a)前記半導体基板の上層の絶縁膜に接続孔を穿孔する工程と、
(b)前記絶縁膜上に、前記接続孔を埋め込むように接続用の導体膜を形成する工程と、
(c)前記接続用の導体膜の形成工程後、前記接続用の導体膜に対して平坦化処理を施して接続孔内以外の接続用の導体膜を除去することにより、前記接続孔内に接続用導体部を形成する工程と、
(d)前記接続用導体部を形成した後の絶縁膜の配線形成領域に配線用溝を形成する工程と、
(e)前記絶縁膜上に、前記配線用溝を埋め込むように配線用の導体膜を形成する工程と、
(f)前記配線用の導体膜の形成工程後、前記配線用の導体膜に対して平坦化処理を施して配線用溝内以外の配線用の導体膜を除去することにより、前記配線用溝内に埋込配線を形成する工程とを有するものである。
(a)前記半導体基板の上層の絶縁膜に配線用溝および接続孔を穿孔する工程と、
(b)前記絶縁膜上に、前記配線用溝および接続孔が埋め込まれるように銅または銅合金からなる導体膜をスパッタリング法により形成する工程と、
(c)前記銅または銅合金からなる導体膜に対して平坦化処理を施して前記配線用溝および接続孔内以外の銅または銅合金からなる導体膜を除去することにより、前記配線用溝および接続孔内に導体膜を埋め込む工程と、
(d)前記銅または銅合金からなる導体膜の平坦化処理工程後に熱処理を施す工程とを有するものである。
図1は本発明の一実施の形態である半導体集積回路装置の要部断面図、図2は図1の半導体集積回路装置の第1層配線を示す要部断面図、図3〜図5は図2の配線構造の変形例を示す断面図、図6は図1の半導体集積回路装置の第2層配線を示す要部断面図、図7は図1の半導体集積回路装置の配線層間接続の変形例を示す半導体集積回路装置の要部断面図、図8〜図12は図1の半導体集積回路装置の製造工程中における要部断面図、図13〜図18は図1の半導体集積回路装置の製造工程中における要部の一部破断斜視図である。
図19〜図23は本発明の他の実施の形態である半導体集積回路装置の製造工程中における要部断面図、図24は半導体集積回路装置の要部断面図である。
本実施の形態2においては、接続用導体部の構造およびその形成方法が前記実施の形態1と異なる。
図25〜図28および図29〜図32は本発明の他の実施の形態である半導体集積回路装置の製造工程中における要部断面図、図33は半導体集積回路装置の要部断面図である。
図34および図35は本発明の他の実施の形態である半導体集積回路装置の要部断面図である。
図36は本発明の他の実施の形態である半導体集積回路装置の要部断面図、図37は図36の半導体集積回路装置の要部拡大断面図、図38は図37に示した半導体集積回路装置の要部の変形例を示す要部拡大断面図、図39は図37に示した半導体集積回路装置の要部拡大断面図、図40および図41は図39に示した半導体集積回路装置の要部拡大断面図、図42は図39の半導体集積回路装置の要部を模式的に示した説明図、図43は図42の変形例を模式的に示した説明図、図44および図45は図42の変形例を模式的に示した説明図、図46〜図50は図36の半導体集積回路装置の要部の変形例を示す要部拡大断面図である。まず、本実施の形態5の半導体集積回路装置の構造を図36〜図50によって説明する。本実施の形態5の基本的な全体構造は、例えば次の通りである。
図60は本発明の他の実施の形態である半導体集積回路装置の要部断面図、図61、図62は図60の半導体集積回路装置の製造工程中における要部断面図である。
2 素子分離部
2a 分離用溝
2b 分離用絶縁膜
3n nチャネル形のMOS・FET
3nd 半導体領域
3ni ゲート絶縁膜
3ng ゲート電極
3p pチャネル形のMOS・FET
3pd 半導体領域
3pi ゲート絶縁膜
3pg ゲート電極
4a〜4d 層間絶縁膜
5a〜5f 配線用溝
5g 接続用溝
6L 第1層配線
6L1 薄い導体膜
6L2 厚い導体膜
7C 接続用導体部
7C1 薄い導体膜
7C2 厚い導体膜
8a〜8f 接続孔
9L 第2層配線
9L1 薄い導体膜
9L2 厚い導体膜
10C 接続用導体部
10C1 薄い導体膜
10C2 厚い導体膜
11L 第3層配線
11L1 薄い導体膜
11L2 厚い導体膜
12C 接続用導体部
12C1 薄い導体膜
12C2 厚い導体膜
13L 第4層配線
13L1 薄い導体膜
13L2 厚い導体膜
14C 接続用導体
14C1 薄い導体膜
14C2 厚い導体膜
15 表面保護膜
15a 保護膜
15b 保護膜
16 開口部
17a〜17c フォトレジストパターン
18C 接続用導体部
19C 接続用導体部
19C1 薄い導体膜
19C2 厚い導体膜
20C 接続用導体部
20C1 薄い導体膜
20C2 厚い導体膜
21C 接続用導体部(中継用の接続用導体部)
21C1 薄い導体膜
21C2 厚い導体膜
102 第5層配線
108 バンプ電極
110 ボンディングワイヤ
200 ゲートアレイ
Claims (20)
- 半導体基板上に形成された第1絶縁膜と、
前記第1絶縁膜に埋め込まれ、銅の拡散を抑制する第1導電体膜と前記第1導電体膜上に形成された銅を主成分とする第2導電体膜からなる第1配線と、
前記第1配線上に形成され前記第1配線の銅の拡散を抑制する第2絶縁膜と、
前記第2絶縁膜上に形成された第3絶縁膜と、
前記第3絶縁膜上に形成されたアルミニウムを主成分とする第2配線と、
前記第2絶縁膜内と第3絶縁膜内に埋め込まれ、前記第1配線と、第2配線を接続し、前記第1配線の銅の拡散を抑制する接続導体と、
からなり前記第2配線の一部にパッド部が形成されていることを特徴とする半導体集積回路装置。 - 前記第2絶縁膜はシリコン窒化膜であることを特徴とする請求項1に記載の半導体集積回路装置。
- 前記第1導電体膜はタングステン、チタンナイトライド、チタン、タンタル、タングステンナイトライド、タンタルナイトライド、タングステンシリサイドナイトライド、チタンシリサイドナイトライド、タンタルシリサイドナイトライドから選択されたいずれか一つであることを特徴とする請求項1に記載の半導体集積回路装置。
- 前記接続導体はタングステン、チタンナイトライド、チタン、タンタル、タングステンナイトライド、タンタルナイトライド、タングステンシリサイドナイトライド、チタンシリサイドナイトライド、タンタルシリサイドナイトライドから選択されたいずれか一つであることを特徴とする請求項1に記載の半導体集積回路装置。
- 前記第2配線上にさらに保護膜が形成されていることを特徴とする請求項1に記載の半導体集積回路装置。
- 前記パッド部は前記保護膜に形成された開口部を介してボンディングワイヤに電気的に接続されていることを特徴とする請求項5に記載の半導体集積回路装置。
- 前記パッド部は前記保護膜に形成された開口部を介してバンプ電極に電気的に接続されていることを特徴とする請求項5に記載の半導体集積回路装置。
- 前記第2配線は第3導電膜とアルミニウムを主体とする第4導電膜を含み、前記第3導電膜は前記第3絶縁膜と第4導電膜の間に形成されており高融点金属からなり、さらに前記第3導電膜は前記接続導体と第4導電膜の間にも形成されていることを特徴とする請求項1に記載の半導体集積回路装置。
- 前記第2配線はさらに前記第4導電膜上にバリア金属を含み、前記第4導電膜は前記第3導電膜とバリア金属で挟まれた構造であることを特徴とする請求項8に記載の半導体集積回路装置。
- 前記第2配線上にさらに第4絶縁膜が形成されており、前記第4絶縁膜上にアルミニウムを主体とした第3配線が形成されており、前記第2配線は前記第3配線を介してボンディングワイヤまたはバンプ電極に電気的に接続されており、前記第3配線は前記第4絶縁膜に形成された開口部を介して前記パッド部に電気的に接続されていることを特徴とする請求項1に記載の半導体集積回路装置。
- 半導体基板上に形成された溝を有する第1絶縁膜と、
前記溝に埋め込まれ、銅の拡散を抑制する第1バリア膜と前記第1バリア膜上に形成された銅を主成分とする第1導電体膜からなる第1配線と、
前記第1配線上に形成され前記第1配線の銅の拡散を抑制する第2バリア膜と、
前記第2バリア膜と前記第1絶縁膜上に形成された第2絶縁膜と、
前記第2絶縁膜上に形成されたアルミニウムを主成分とする第2配線と、
前記第2配線上に形成された第3絶縁膜と、
前記第2絶縁膜内に埋め込まれ、前記第1配線と第2配線を電気的に接続する接続導体と、
からなり前記第3絶縁膜の一部には前記第2配線の一部が露出するような開口部が形成されていることを特徴とする半導体集積回路装置。 - 前記第2配線は前記第1配線と銅の拡散を抑制する第2導電体膜を介して電気的に接続されていることを特徴とする請求項11に記載の半導体集積回路装置。
- 前記開口部から露出している前記第2配線の一部はボンディングワイヤに電気的に接続されていることを特徴とする請求項11に記載の半導体集積回路装置。
- 前記開口部から露出している前記第2配線の一部はバンプ電極に電気的に接続されていることを特徴とする請求項11に記載の半導体集積回路装置。
- 前記第2配線は第2導電膜とアルミニウムを主体とする第3導電膜を含み、前記第2導電膜は前記第2絶縁膜と第3導電膜の間に形成されており高融点金属からなり、さらに前記第2導電膜は前記接続導体と第3導電膜の間にも形成されていることを特徴とする請求項11に記載の半導体集積回路装置。
- 前記第2配線はさらに前記第3導電膜上にバリア金属を含み、前記第3導電膜は前記第2導電膜とバリア金属で挟まれた構造であることを特徴とする請求項15に記載の半導体集積回路装置。
- 前記第2配線は第2導電膜とアルミニウムを主体とする第3導電膜を含み、前記第2導電膜は前記第2絶縁膜と第3導電膜の間に形成されており高融点金属からなり、さらに前記第2導電膜は前記接続導体と一体的に形成されており前記第2導電膜と接続導体は銅に対するバリア層として形成されていることを特徴とする請求項11に記載の半導体集積回路装置。
- 前記第2バリア膜は銅の拡散を抑制するキャップ導電層として形成されていることを特徴とする請求項11に記載の半導体集積回路装置。
- 前記第3絶縁膜上にアルミニウムを主体とし、パッド部を構成する第3配線が形成されており、前記パッド部はボンディングワイヤまたはバンプ電極に電気的に接続されており、前記第3配線は前記開口部から露出している前記第2配線の一部に電気的に接続されていることを特徴とする請求項11に記載の半導体集積回路装置。
- 半導体基板上に形成された溝を有する第1絶縁膜と、
前記溝に埋め込まれ、銅の拡散を抑制する第1バリア膜と前記第1バリア膜上に形成された銅を主成分とする第1導電体膜からなる第1配線と、
前記第1配線上に形成され前記第1配線の銅の拡散を抑制する第2バリア膜と、
前記第2バリア膜と前記第1絶縁膜上に形成された第2絶縁膜と、
前記第2絶縁膜上に形成されたアルミニウムを主成分とする第2配線と、
からなり前記第2配線の一部にパッド部が形成され、前記パッド部はボンディングワイヤまたはバンプ電極に接続されており、前記第2配線は前記第1配線にバリア金属を通して電気的に接続されていることを特徴とする半導体集積回路装置。
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