Patent ID: 10608107

Abstract:
A silicon carbide substrate includes a first impurity region, a second impurity region in contact with the first impurity region and having p type, a third impurity region on the first impurity region and the second impurity region and having n type, a body region, and a source region. A gate insulating film is in contact with the source region, the body region and the third impurity region at a side surface, and in contact with the third impurity region at a bottom surface. When viewed in a direction perpendicular to a main surface, the second impurity region contains the bottom surface, and an area of the second impurity region is greater than an area of the bottom surface, and is not more than three times the area of the bottom surface. An impurity concentration of the second impurity region exceeds 1×1019 cm−3, and is not more than 1×1021 cm−3.