Patent ID: 9412856
Filing Date: 2016-08-09
CPC Classification: H01L

Claim Text:
1. A semiconductor device, comprising: a first nitride semiconductor layer; a second nitride semiconductor layer on the first nitride semiconductor layer and having a band gap larger than a band gap of the first nitride semiconductor layer; a source electrode and a drain electrode spaced apart from each other in a first direction and directly contacting the second nitride semiconductor layer; a third nitride semiconductor layer on the second nitride semiconductor layer and between the source and drain electrodes in the first direction; and a gate electrode on the third nitride semiconductor layer, wherein the third nitride semiconductor layer comprises a plurality of stacked layers between the second semiconductor layer and the gate electrode in a second direction crossing the first direction, the plurality of stacked layers including at least two first layers and at least one second layer, the at least two first layers having a p-type dopant concentration that is higher than a p-type dopant concentration of the at least one second layer, the at least one second layer having a band gap that is larger than a band gap of the at least two first layers, and a first one of the at least two first layers being a layer in the plurality of stacked layers nearest the gate electrode and a second one of the at least two first layers being a layer in the plurality of stacked layers nearest the second nitride semiconductor layer.