Patent ID: 7250679

Claim:
A semiconductor device comprising: a first inter-layer insulation film formed over a substrate and including a first low dielectric constant film whose dielectric constant is lower than that of silicon oxide and a hydrophilic insulation film formed on the first low dielectric constant film; a first interconnection layer buried in a first interconnection trench formed in the first inter-layer insulation film, whose minimum interconnection pitch is a first pitch; a second inter-layer insulation film formed over the first inter-layer insulation film and including a second low dielectric constant film whose dielectric constant is lower than that of silicon oxide; a second interconnection layer buried in a second interconnection trench formed in the second inter-layer insulation film, whose minimum interconnection pitch is a second pitch larger than the first pitch; and a diffusion preventing film formed directly on upper surfaces of the second low dielectric constant film and the second interconnection layer, without any hydrophilic insulation film between the second low dielectric constant film and the diffusion preventing film.