Patent ID: 9412858
Filing Date: 2016-08-09
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a substrate; a first nitride semiconductor layer formed on the substrate; a p-type nitride semiconductor layer formed on the first nitride semiconductor layer; a recess having a bottom portion which reaches the first nitride semiconductor layer through a part of the p-type nitride semiconductor layer; a third nitride semiconductor layer formed to cover the bottom portion of the recess, a side portion of the recess, and a part of an upper surface of the p-type nitride semiconductor layer; a fourth nitride semiconductor layer formed on an upper surface of the third nitride semiconductor layer; a first electrode formed on a rear surface of the substrate; a gate electrode formed on the upper surface of the p-type nitride semiconductor layer; and a second electrode that is in contact with the third nitride semiconductor layer or the fourth nitride semiconductor layer, wherein the third nitride semiconductor layer has a bandgap different from a bandgap of the fourth nitride semiconductor layer.