Patent ID: 9024329
Filing Date: 2015-05-05
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first semiconductor layer having a first conductivity type and made of silicon carbide; a second semiconductor layer made of silicon carbide, provided on the first semiconductor layer and having a second conductivity type opposite to the first conductivity type; a trench penetrating through the second semiconductor layer to reach the first semiconductor layer; an insulating layer formed at a bottom and a side of the trench along an inner surface of the trench; a gate electrode insulated by the insulating layer from the first semiconductor layer and the second semiconductor layer, at least part of the gate electrode being formed inside the trench; and a semiconductor region made of silicon carbide, having the first conductivity type and formed around the trench on the second semiconductor layer; wherein the second semiconductor layer includes a region that is along the trench, the region of the second semiconductor layer that is along the trench includes a high-concentration region where impurity concentration is equal to or higher than 5×10 the high-concentration region is in a form of a layer that is in contact with the trench and that spreads in a direction perpendicular to a depth direction of the trench, and the high-concentration region has a peak impurity region in a medium portion of the second semiconductor layer along the trench.