Patent ID: 9496344
Filing Date: 2016-11-15
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a wide band gap semiconductor substrate that is of a first conductive type; a drift layer that is of the first conductive type and configured with a wide band gap semiconductor and that is formed on a first main surface of the wide band gap semiconductor substrate; a plurality of first well regions that are of a second conductive type and that are formed in a surface layer portion of the drift layer adjacent to each other at a predetermined interval; a second well region that is formed adjacent to each of the first well regions and toward the semiconductor substrate, has a second conductive type impurity density lower than the first well regions, and has a constant width that is narrower than a width of the first well regions to form T-shaped well configurations: a Schottky electrode that is formed on surfaces of the drift layer and the first well regions to form a Schottky connection with the drift layer; and an ohmic electrode that is formed on a second main surface of the semiconductor substrate which is opposite to the first main surface, wherein at least some regions in the first well regions are not depleted when the semiconductor device is in an off-state.