JP4832807B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP4832807B2 JP4832807B2 JP2005165252A JP2005165252A JP4832807B2 JP 4832807 B2 JP4832807 B2 JP 4832807B2 JP 2005165252 A JP2005165252 A JP 2005165252A JP 2005165252 A JP2005165252 A JP 2005165252A JP 4832807 B2 JP4832807 B2 JP 4832807B2
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- H01L21/76892—Modifying permanently or temporarily the pattern or the conductivity of conductive members, e.g. formation of alloys, reduction of contact resistances modifying the pattern
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Description
(実施の形態1)
図1は、本発明の実施の形態1における半導体装置の構造を示す断面図である。
図2〜図10は、本発明の実施の形態1における半導体装置の製造方法を工程順に示す断面図である。
図11は、本発明の実施の形態2における半導体装置の構造を示す断面図である。
本実施の形態の半導体装置の製造方法において、導電膜15aを形成する際に、下部配線5を貫通するまで物理的にエッチングする。
図12は、本発明の実施の形態3における半導体装置の構造を示す断面図である。
図14は、本発明の実施の形態4における半導体装置の構造を示す断面図である。図14を参照して、本実施の形態の半導体装置は、以下の点において実施の形態1の半導体装置と異なっている。すなわち、Cu膜19を覆うように層間絶縁膜12上にライナー膜111が形成されており、ライナー膜111上に層間絶縁膜112が形成されている。層間絶縁膜112の上部にはトレンチ114が形成されており、トレンチ114内およびライナー膜111には、配線5aの上面29に達する孔110が開口されている。トレンチ114の内壁面および底部と、孔110の内壁面および底部とに沿って、バリアメタル113が形成されている。トレンチ114および孔110内を埋めるようにCu膜119が形成されている。
図15は、本発明の実施の形態5における半導体装置の断面を簡略化して示す図である。図15を参照して、本実施の形態の半導体装置は、多数の配線35a〜35fの各々と、配線35a〜35fの各々の間を電気的に接続するためのコンタクト39a〜39eの各々とを備えている。配線35a〜35fの各々は、絶縁層を介してこの順序で積層して形成されている。また、配線35aおよび配線35bはコンタクト39aによって電気的に接続されており、配線35bおよび配線35cはコンタクト39bによって電気的に接続されている。また、配線35cおよび配線35dはコンタクト39cによって電気的に接続されており、配線35dおよび配線35eはコンタクト39dによって電気的に接続されている。さらに、配線35eおよび配線35fはコンタクト39eによって電気的に接続されている。
図17は、本発明の実施の形態6における半導体装置の断面を簡略化して示す図である。図17を参照して、コンタクト39a〜39eは口径Aまたは口径Cを有している。コンタクト39a〜39cの各々は口径Aを有しており、コンタクト39dおよび39eの各々は口径Cを有している。口径Cは口径Aよりも大きい。
本実施例では、従来の半導体装置と本発明の半導体装置との信頼性を比較した。具体的には、下部配線をエッチングせずにビアホールを形成した従来の半導体装置と、図1に示す本発明の半導体装置との寿命を調べた。図18にその結果を示す。なお、従来の半導体装置については、図18中の黒丸と白丸との2つの集団についての寿命を調べた。四角は本発明の半導体装置を示している。
Claims (10)
- 半導体基板上に形成され、第一層間絶縁膜と上記第一層間絶縁膜内に第一銅配線とを有する第一層と、
上記第一層上に形成され、上記第一銅配線の上面に接するように形成される第一絶縁膜と、
上記第一絶縁膜上に形成された第二層間絶縁膜と、
上記第一銅配線の上方において上記第一絶縁膜を貫通するように上記第二層間絶縁膜及び上記第一絶縁膜に設けられた第一ホールと、
上記第一ホールの側壁に沿って上記第二層間絶縁膜上及び上記第一絶縁膜上に形成された第一バリアメタルと、
上記第一ホールの下側に上記第一ホールと連通するように上記第一銅配線に設けられ、上記第一ホールの口径よりも大きな口径を有する第二ホールと、
上記第二ホールの下側に上記第二ホールと連通するように上記第一銅配線に設けられた、円錐形状又は半球形状の第三ホールと、
上記第二ホールの内壁面に形成された所定の導電膜と、
上記第一バリアメタル上、上記第二ホール内の上記所定の導電膜上及び上記第三ホールの内壁面に形成された第二バリアメタルと、
上記第一、第二及び第三ホール内に埋め込まれた第一銅金属とを有することを特徴とする半導体装置。 - 半導体基板上に形成され、第一層間絶縁膜と上記第一層間絶縁膜内に第一銅配線とを有する第一層と、
上記第一層上に形成され、上記第一銅配線の上面に接するように形成される第一絶縁膜と、
上記第一絶縁膜上に形成された第二層間絶縁膜と、
上記第一銅配線の上方において上記第一絶縁膜を貫通するように上記第二層間絶縁膜及び上記第一絶縁膜に設けられた第一ホールと、
上記第一ホールの側壁に沿って上記第二層間絶縁膜上及び上記第一絶縁膜上に形成された第一バリアメタルと、
上記第一ホールの下側に上記第一ホールと連通するように上記第一銅配線に設けられ、上記第一ホールの口径よりも大きな口径を有する第二ホールと、
上記第二ホールの下側に上記第二ホールと連通するように上記第一銅配線に設けられ、上記第一銅配線を30nm以上掘り込むことで形成された第三ホールと、
上記第二ホールの内壁面に形成された所定の導電膜と、
上記第一バリアメタル上、上記第二ホール内の上記所定の導電膜上及び上記第三ホールの内壁面に形成された第二バリアメタルと、
上記第一、第二及び第三ホール内に埋め込まれた第一銅金属とを有することを特徴とする半導体装置。 - 半導体基板上に形成され、第一層間絶縁膜と上記第一層間絶縁膜内に第一銅配線とを有する第一層と、
上記第一層上に形成され、上記第一銅配線の上面に接するように形成される第一絶縁膜と、
上記第一絶縁膜上に形成された第二層間絶縁膜と、
上記第一銅配線の上方において上記第一絶縁膜を貫通するように上記第二層間絶縁膜及び上記第一絶縁膜に設けられた第一ホールと、
上記第一ホールの側壁に沿って上記第二層間絶縁膜上及び上記第一絶縁膜上に形成された第一バリアメタルと、
上記第一ホールの下側に上記第一ホールと連通するように上記第一銅配線に設けられ、上記第一ホールの口径よりも大きな口径を有する第二ホールと、
上記第二ホールの下側に上記第二ホールと連通するように上記第一銅配線に設けられ、上記第一ホールの口径よりも小さな口径を有する第三ホールと、
上記第二ホールの内壁面に形成された所定の導電膜と、
上記第一バリアメタル上、上記第二ホール内の上記所定の導電膜上及び上記第三ホールの内壁面に形成された第二バリアメタルと、
上記第一、第二及び第三ホール内に埋め込まれた第一銅金属とを有することを特徴とする半導体装置。 - 上記第二層間絶縁膜内に設けられた第一溝内に形成された第二銅配線を更に有し、
上記第一溝の底面及び側面の上記第二層間絶縁膜上に形成された第三バリアメタルと、上記第一溝内の第二銅金属により上記第二銅配線が形成され、
上記第一バリアメタル、上記第二バリアメタル及び上記第一銅金属により第一ビアが形成され、
上記第三バリアメタルと上記第二バリアメタルは同一工程で形成され、
上記第一銅金属及び上記第二銅金属は同一工程で形成されることを特徴とする請求項1〜3のいずれか一項に記載の半導体装置。 - 上記第一バリアメタルと上記第二バリアメタルとの間に、上記第一バリアメタルの材料と上記第一銅配線の材料との合金で構成された上記所定の導電膜を更に有することを特徴とする請求項4に記載の半導体装置。
- 上記第一層間絶縁膜及び上記第二層間絶縁膜はそれぞれ、TEOS、SiO2、SiO
Cから選択された一つの材料を含有し、
上記第一バリアメタル、上記第二バリアメタルおよび上記第三バリアメタルはそれぞれ、タンタル、タンタル窒化物、タンタル珪化物、タンタル炭化物、チタン窒化物、チタン珪化物、チタン炭化物、タングステン窒化物、タングステン珪化物、タングステン炭化物、ルテニウム、およびルテニウム酸化物よりなる群から選ばれる1種以上の膜より形成されていることを特徴とする請求項4に記載の半導体装置。 - 上記第一銅金属と上記第二銅金属はそれぞれ、シード層と上記シード層上に形成された銅層により構成されていることを特徴とする請求項4に記載の半導体装置。
- 上記第二銅配線上及び上記第二層間絶縁膜上に第二層がさらに形成されており、
上記第二層は、
上記第二銅配線上及び上記第二層間絶縁膜上に形成された第二絶縁膜と、
上記第二絶縁膜上に形成された第三層間絶縁膜と、
上記第二絶縁膜と上記第三層間絶縁膜を貫通するように設けられ、上記第二銅配線を露出するように設けられた第四ホールと、
上記第三層間絶縁膜内に形成され、上記第四ホールと連通する第二溝と、
上記第二溝の側面、上記第二溝の底面、上記第四ホールの側面及び上記第四ホールの底面に形成された第四バリアメタルと、
上記第四バリアメタル上に形成された第三銅金属とを有し、
上記第四ホール内の上記第四バリアメタルと上記第三銅金属により第二ビアが形成され、上記第二溝内の上記第四バリアメタルと上記第三銅金属により第三銅配線が形成され、
上記第四ホールの底面の上記第四バリアメタルは露出した上記第二銅配線と接触しており、
上記第四ホールの底面の上記第四バリアメタルは、上記第二絶縁膜と第二銅配線との接触面よりも高い位置に存在することを特徴とする請求項4に記載の半導体装置。 - 上記第四ホールの径よりも上記第一ホールの径の方が小さいことを特徴とする請求項8記載の半導体装置。
- 上記第一絶縁膜はSiCN、SiC又はSiCOのうちのいずれかを材料とすることを特徴とする請求項4記載の半導体装置。
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US11/676,951 US7709955B2 (en) | 2004-06-10 | 2007-02-20 | Semiconductor device with a line and method of fabrication thereof |
US11/676,962 US7709388B2 (en) | 2004-06-10 | 2007-02-20 | Semiconductor device with a line and method of fabrication thereof |
US12/730,039 US7936069B2 (en) | 2004-06-10 | 2010-03-23 | Semiconductor device with a line and method of fabrication thereof |
US13/052,712 US8222146B2 (en) | 2004-06-10 | 2011-03-21 | Semiconductor device with a line and method of fabrication thereof |
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US20070141831A1 (en) | 2007-06-21 |
US20110171828A1 (en) | 2011-07-14 |
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