Patent ID: 9525059
Filing Date: 2016-12-20
CPC Classification: H01L

Claim Text:
1. A semiconductor device, comprising: a semiconductor layer that has a first surface and a second surface; a drift region of a first conductivity type in the semiconductor layer; a body region of a second conductivity type in the semiconductor layer between the drift region and the first surface; a source region of the first conductivity type in the semiconductor layer between the body region and the first surface; a first gate electrode; a second gate electrode, the body region being between the first gate electrode and the second gate electrode; a first gate insulating film between the first gate electrode and the body region; a second gate insulating film between the second gate electrode and the body region; a first field plate electrode between the second surface and the first gate electrode; a second field plate electrode between the second surface and the second gate electrode; a first field plate insulating film between the first field plate electrode and the drift region; a second field plate insulating film between the second field plate electrode and the drift region; a first region of the drift region having at least a portion between the first field plate electrode and the second field plate electrode; a second region of the drift region between the first region and the body region, having an impurity concentration of the first conductivity type that is higher than an impurity concentration of the first conductivity type in the first region; and a third region of the drift region between the second region and the body region, having an impurity concentration of the first conductivity type that is lower than the impurity concentration of the first conductivity type in the second region.