Patent ID: 9293574
Filing Date: 2016-03-22
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a substrate; a first nitride semiconductor layer above the substrate; a second nitride semiconductor layer above the first nitride semiconductor layer and having a band gap larger than a band gap of the first nitride semiconductor layer; a p-type nitride semiconductor layer above a portion of the second nitride semiconductor layer; two third nitride semiconductor layers of n-type and above the second nitride semiconductor layer, the two third nitride semiconductor layers being located separately on either side of the p-type nitride semiconductor layer; and a first ohmic electrode and a second ohmic electrode, the first ohmic electrode being located above one of the two third nitride semiconductor layers, the second ohmic electrode being located above the other of the two third nitride semiconductor layers; and a gate electrode above the p-type nitride semiconductor layer, wherein the second nitride semiconductor layer includes, in a region above which neither the p-type nitride semiconductor layer nor the two third nitride semiconductor layers is located, a surface layer including a p-type impurity identical to a p-type impurity included in the p-type nitride semiconductor layer.