Patent ID: 8350289
Filing Date: 2013-01-08
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first semiconductor layer; a first electrode provided on a first surface side of the first semiconductor layer; a first insulating layer provided between the first semiconductor layer and the first electrode and configured to constrict current flowing between the first semiconductor layer and the first electrode; and a second semiconductor layer of a first conductivity type provided at least on a path of the current constricted by the first insulating layer and being in contact with the first electrode, the second semiconductor layer containing first impurities at a concentration higher than a concentration of impurities contained in the first semiconductor layer, wherein the second semiconductor layer is provided on the first surface side of the first semiconductor layer and includes a first portion whose cross section taken along a plane parallel to the first surface is smaller than a cross section of the first semiconductor layer and a cross section of the first insulating layer.