Patent ID: 8859426

Claim:
A method of manufacturing a semiconductor device, comprising: preparing a semiconductor substrate; forming a first insulating film on a surface of the semiconductor substrate; forming a first trench in the first insulating film, wherein the first trench exposes an inner surface of the first insulating film; forming a first barrier film on the inner surface of the first insulating film, except for a top peripheral region of the first trench; forming a first conductive film including copper on the first barrier film so that an upper surface of the first barrier film is lower than an upper surface of the first conductive film and an upper surface of the first insulating film, wherein top sidewall regions of the first conductive film are exposed from the first barrier film; and forming a covering film on the upper surface and the top sidewall regions of the first conductive film, and the upper surface of the first barrier film, so that the covering film is in contact with the first barrier film at a level lower than the upper surface of the first conductive film, wherein the first conductive film is formed so that a thickness of the first conductive film is substantially the same as a depth of the first trench, and wherein the covering film is an etching stopper.