Patent ID: 8319317

Claim:
A mesa type semiconductor device comprising: a semiconductor substrate of a first general conductivity type; a first semiconductor layer of the first general conductivity type disposed on the semiconductor substrate, an impurity concentration of the first semiconductor layer being lower than an impurity concentration of the semiconductor substrate; a second semiconductor layer of a second general conductivity type disposed on the first semiconductor layer so as to form a PN junction between the first and second semiconductor layers; a mesa groove penetrating into the semiconductor substrate through the first and second semiconductor layers; an oxide film disposed on the second semiconductor layer and in the mesa groove; an organic insulation film disposed in the mesa groove so as to cover the oxide film at the PN junction and only a portion of the top surface of the second semiconductor layer, the portion being adjacent to and contiguous with the groove, the organic insulation film being in contact with the oxide film at the covered portion of the top surface of the second semiconductor layer; and a wiring disposed on the oxide film.