Semiconductor diode device

Abstract

According to one embodiment, a semiconductor device includes first and second electrodes, and first, second, and third semiconductor regions. The first semiconductor region has a first conductivity type. The first electrode is provided above the first semiconductor region. The second semiconductor region has a second conductivity type and is provided between the first semiconductor region and the first electrode. The third semiconductor region is provided between the first semiconductor region and the first electrode, and has the second conductivity type. The third semiconductor region has an impurity concentration substantially equal to an impurity concentration of the second semiconductor region, and has first and second portions. The first and second portions constitute a concave-convex form on a side of the first semiconductor region of the third semiconductor region. The second electrode is provided above an opposite side of the first semiconductor region from the first electrode.

Dependencies are inferred from the claim text.