Patent ID: 7572717

Claim:
A method of manufacturing a semiconductor device, comprising: forming on a semiconductor substrate an insulating film having a recessed portion in a surface thereof, the recessed portion forming a space over the semiconductor substrate; forming a barrier film on an inside face of the recessed portion and on the insulating film; forming a seed film on the barrier film; forming a first metal film on the seed film so as to fill up the space formed by the recessed portion; forming on the first metal film a second metal film having lower vacancy density than that of the first metal film; forming on the second metal film a compression stress applying film which applies compression stress to the first metal film through the second metal film when heat treatment is applied; performing heat treatment on the first metal film, the second metal film and the compression stress applying film; and removing the second metal film and the first metal film except a portion thereof filling up the recessed portion to thereby form a wiring in the recessed portion.