Patent ID: 7709925

Claim:
A semiconductor device, comprising: a semiconductor substrate of a first conductivity type; a semiconductor layer of a second conductivity type formed on said semiconductor substrate; a trench formed in said semiconductor layer; a trench diffusion layer of the first conductivity type formed along wall surfaces of said trench; a buried conductor buried in said trench; a first diffusion layer of the first conductivity type formed in said semiconductor layer around an opening of said trench; a second diffusion layer of the first conductivity type formed along said trench diffusion layer which is in the vicinity of the opening of said trench; and a front electrode formed on the buried conductor, wherein an insulation film is further disposed between said wall surfaces of said trench and said buried conductor, and wherein said buried conductor is electrically connected with said trench diffusion layer via the first diffusion layer, the second diffusion layer, and the front electrode.