Patent ID: 7560378

Claim:
A method for manufacturing a semiconductor device, comprising: preparing a semiconductor substrate having an upper surface and a lower surface opposite to the upper surface; forming a first insulating film over the upper surface of the semiconductor substrate; sequentially laminating a diffusion barrier film covering a surface of the first insulating film, a second insulating film covering the diffusion barrier film, and a cap film covering the second insulating film; forming wiring trench portions extending through the diffusion barrier film, the second insulating film and the cap film, a ratio of 1) a width of the wiring trench portions in a direction orthogonal to a lengthwise extending direction of the wiring trench portions, to 2) a height extending from a bottom face of the wiring trench portions to an uppermost surface of the cap film is defined as not greater than 2.8; forming a barrier metal film which covers the uppermost surface of the cap film and surfaces within the wiring trench portions; depositing a wiring film on the barrier metal film to bury the wiring trench portions and cover the barrier metal film; and chipping away the wiring film and the barrier metal film until the uppermost surface of the cap film is exposed, so that the wiring film and the barrier metal film remain buried in the wiring trench portions, wherein said depositing a wiring film comprises growing the wiring film on the uppermost surface of the cap film as having a thickness ranging from 0.9 to 1.5 times a depth of the wiring trench portions.