Patent ID: 7414314

Claim:
A semiconductor device comprising: a semiconductor substrate; a first insulating film formed on a surface of the semiconductor substrate, the first insulating film having a first trench so that the first trench exposes an inner surface of the first insulating film; a first barrier film formed on the inner surface of the first insulating film except for a top peripheral region of the first trench; a first conductive film formed on the first barrier film, wherein the first conductive film includes copper, wherein an uppermost surface of the first barrier film is lower than uppermost surfaces of the first conductive film and the first insulating film, and wherein a top peripheral region of the first conductive film is apart from the inner surface of the first insulating film; a covering film formed on the uppermost surface of the first conductive film and the uppermost surface of the first insulating film, wherein the covering film is provided between the inner surface of the first insulating film and the top peripheral region of the first conductive film, wherein the covering film is in contact with the first barrier film at a level lower than the uppermost surface of the first conductive film, and wherein a top surface of the covering film is higher than the uppermost surface of the first conductive film; and a second conductive film extending through the covering film and in electrical contact with the first conductive film.