Patent ID: 8901622
Filing Date: 2014-12-02
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate of a first conductivity type; a first semiconductor layer of the first conductivity type formed on the semiconductor substrate; a first semiconductor region of a second conductivity type selectively formed on at least a part of the first semiconductor layer; a second semiconductor region of the second conductivity type formed on another part of the first semiconductor layer to reach an inside of the first semiconductor layer and having an impurity concentration higher than that of the first semiconductor region; a third semiconductor region of the first conductivity type formed in a part of the first semiconductor region to range from a surface of the first semiconductor region to an inside of the first semiconductor region; a first electrode formed to be in contact with the second and third semiconductor regions and not to be in contact with the first semiconductor region; and a second electrode formed to be in contact with a rear surface of the semiconductor substrate, wherein the first semiconductor region does not overlap a bottom surface of the second semiconductor region, the first semiconductor region is arranged on the first semiconductor layer not via a semiconductor region of the second conductivity type and is located adjacent to the second semiconductor region, and the third semiconductor region is not in contact with the second semiconductor region.