Patent ID: 7737465

Claim:
A semiconductor apparatus comprising: a first conductive type semiconductor substrate; a first conductive type first semiconductor region with an impurity concentration lower than that of the semiconductor substrate and formed on a first principal surface of the semiconductor substrate; a second conductive type second semiconductor region formed in a surface region of the first semiconductor region and which forms a PN junction with the first semiconductor region; a contact region including a part of the first semiconductor region and a part of the second semiconductor region; an insulating layer having an opening part through which at least the contact region are exposed; a first electrode formed so as to be in contact with at least the contact region; and a second electrode formed on a second principal surface of the semiconductor substrate, wherein the second semiconductor region, viewed from a direction perpendicular to the first principal surface, comprises: a first region in which a plurality of islands of the second semiconductor region are aligned with intervals; and a second region which connects each end of the islands of the first region each other.