Patent ID: 8368181

Claim:
A mesa semiconductor device comprising: a semiconductor substrate comprising a first semiconductor layer of a first general conductive type and a second semiconductor layer of a second general conductive type formed on a front surface of the first semiconductor layer so as to have a PN junction between the first and second semiconductor layers; a first insulation film disposed on a front surface of the second semiconductor layer; a step portion formed in a sidewall of the semiconductor substrate so as to have a dent penetrating into the second semiconductor layer and at least part of the first semiconductor layer; and a second insulation film filling the dent at least partially and extending to cover part of the front surface of the second semiconductor layer so that the second insulation film is exposed as part of an edge of an operative semiconductor device, the second insulation film being directly in contact with the front surface of the second semiconductor layer, the second insulation film comprising an organic insulator.