Patent ID: 9419133
Filing Date: 2016-08-16
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a first-conductivity-type wide band gap semiconductor substrate; a first-conductivity-type wide band gap semiconductor layer disposed on a surface of the first-conductivity-type wide band gap semiconductor substrate and having an impurity concentration lower than that of the first-conductivity-type wide band gap semiconductor substrate; a first second-conductivity-type semiconductor region selectively disposed in a surface layer of the first-conductivity-type wide band gap semiconductor layer, on a side opposite to the first-conductivity-type wide band gap semiconductor substrate; an element structure made up of at least a metal film forming a metal-semiconductor junction on the first-conductivity-type wide band gap semiconductor layer and the first second-conductivity-type semiconductor region; a second second-conductivity-type semiconductor region selectively disposed in a surface layer of the first-conductivity-type wide band gap semiconductor layer, on the side opposite to the first-conductivity-type wide band gap semiconductor substrate, to surround a peripheral portion of the element structure; a third second-conductivity-type semiconductor region surrounding a peripheral portion of the second second-conductivity-type semiconductor region to make up a junction termination structure and having an impurity concentration lower than that of the second second-conductivity-type semiconductor region; and an interlayer insulation film covering the third second-conductivity-type semiconductor region, wherein the metal film is extended continuously over the first second-conductivity-type semiconductor region, the second second-conductivity-type semiconductor region and on the interlayer insulation film to a position directly overlying a portion of the third second-conductivity-type semiconductor region, via the interlayer insulation film.