Patent ID: 9691891
Date: 2017-06-27
CPC Classifications: H01L

Claim:
1. A wide band gap semiconductor device comprising: a semiconductor substrate having a main surface and made of a wide band gap semiconductor; a device region formed in the semiconductor substrate; and a peripheral region formed to surround the device region, in the peripheral region, the semiconductor substrate including a first semiconductor region having a first conductivity type, and a second semiconductor region formed on the first semiconductor region and having the main surface, the second semiconductor region having a second conductivity type different from the first conductivity type, in the peripheral region, the semiconductor substrate having a stepped portion annularly surrounding the device region, the second semiconductor region being formed along the stepped portion, wherein a dielectric layer is formed on the stepped portion, and the second semiconductor region is formed to be sandwiched between the first semiconductor region and the dielectric layer in the stepped portion.