Patent ID: 9437672
Filing Date: 2016-09-06
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a first semiconductor layer of a nitride semiconductor formed on a substrate; a first recess portion formed on a surface of the first semiconductor layer in a first region of the semiconductor device; a second semiconductor layer of a nitride semiconductor formed on a bottom and a side surface of the first recess portion and on the surface of the first semiconductor layer in a second region of the semiconductor device; and a second recess portion formed on a surface of the second semiconductor layer in the first region of the semiconductor device; a hole extraction electrode formed in the second recess portion and on the second semiconductor layer in the first region of the semiconductor device; a gate electrode, a source electrode and a drain electrode formed on the second semiconductor layer in the second region of the semiconductor device, wherein the side surface of the first recess portion configured to form a vertical interface, the vertical interface of the first semiconductor layer includes N atoms at the surface referred to as an N-polar surface.