Patent ID: 8575622
Filing Date: 2013-11-05
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, a size of the second semiconductor layer in a depth direction of the trench is 0.1 to 0.5 μm, and a peak impurity concentration of the region of the second semiconductor layer that is along the trench is in a range of 7×10