Patent ID: 7045898
Filing Date: 2006-05-16
Classification: H01L

Abstract:
1. A semiconductor device comprising: at least one lower interconnection situated in a first opening formed in a first interlayer insulating film, the first interlayer insulating film having an upper surface and a lower surface comprising SiO a first barrier metal film of a Ta-based material selected from TaN or TaNSi disposed in the first opening, a first conductive film of a copper-based metal filling in the first opening, with a first recess formed on the upper surface of the first conductive film, a second barrier metal film of a Ta-based material selected from TaN or TaNSi disposed in the first recess, wherein an outline of the first conductive film is covered by the first barrier metal film and the second barrier metal film, and wherein the upper surface of the second barrier metal film and the upper surface of the first interlayer insulating film are coplanar; and at least one upper interconnection situated in a second opening formed in a second interlayer insulating film, the second interlayer insulating film having a through hole therein and an upper surface and a lower surface comprising SiO a third barrier metal film of a Ta-based material selected from TaN or TaNSi disposed in the second opening, a second conductive film of a copper-based metal filling in the second opening, with a second recess formed on the upper surface of the second conductive film, and a fourth barrier metal film of a Ta-based material selected from TaN or TaNSi disposed in the second recess, wherein an outline of the second conductive film is covered by the third barrier metal film and the fourth barrier metal film, and wherein the upper surface of the fourth barrier metal film and the upper surface of the second interlayer insulating film are coplanar.