Patent ID: 8809969

Claim:
A semiconductor device comprising: a semiconductor substrate of a first conductivity type; an impurity diffusion region of a second conductivity type disposed to extend to a predetermined depth from a first main surface of said semiconductor substrate toward a second main surface of said semiconductor substrate, an annular junction region being formed between said impurity diffusion region and said semiconductor substrate; a plurality of annular guard rings of the second conductivity type disposed at said first main surface of said semiconductor substrate to surround said annular junction region and to be spaced from each other by a predetermined distance in a normal direction; a first interlayer insulating film disposed to cover said first main surface of said semiconductor substrate; one or more conductive films disposed to extend in one or more contact holes running in a thickness direction through said first interlayer insulating film, said one or more conductive films being electrically connected with said annular guard rings of the second conductivity type; and a second interlayer insulating film disposed to cover said first interlayer insulating film and said one or more conductive films, said second interlayer insulating film being of a semi-insulating material, wherein each of said one or more conductive films including a discontinuous region, each of the one or more conductive films being located between one of said plurality of annular guard rings and said second interlayer insulating film, and being disposed along said one of the annular guard rings, and said discontinuous region including one or more discrete portions where a respective one of the conductive films is present and one or more interruptions where the respective one of the conductive films is absent.