Patent ID: 9536949
Date: 2017-01-03
CPC Classifications: H01L

Claim:
1. A nitride semiconductor device comprising: a substrate; a first nitride semiconductor layer supported by the substrate; a second nitride semiconductor layer which is disposed on the first nitride semiconductor layer and which includes a second nitride semiconductor having a larger bandgap than that of a first nitride semiconductor included in the first nitride semiconductor layer; a source-side nitride semiconductor regrowth layer which is located on a source-side recess region and which includes a third nitride semiconductor containing Ge, the source-side recess region having a first recess which extends through a part of the second nitride semiconductor layer to reach the first nitride semiconductor layer; a source electrode electrically connected to the source-side nitride semiconductor regrowth layer; a drain-side nitride semiconductor regrowth layer which is located on a drain-side recess region and which includes a fourth nitride semiconductor containing Ge, the drain-side recess region located apart from the source-side recess region and having a second recess which extends through another part of the second nitride semiconductor layer to reach the first nitride semiconductor layer; a drain electrode electrically connected to the drain-side nitride semiconductor regrowth layer; a gate electrode located on the second nitride semiconductor layer between the source-side nitride semiconductor regrowth layer and the drain-side nitride semiconductor regrowth layer; a first diffusion layer which is disposed in the first nitride semiconductor layer and which contains Ge diffused from the source-side nitride semiconductor regrowth layer to the first nitride semiconductor layer; and a second diffusion layer which is disposed in the first nitride semiconductor layer and which contains Ge diffused from the drain-side nitride semiconductor regrowth layer to the first nitride semiconductor layer.