Patent ID: 9711404
Date: 2017-07-18
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: a substrate comprising a first region of a first material and a second region of the first material adjacent to the first region, and a thickness of the substrate in the first region is smaller than a thickness of the substrate in the second region; a nitride semiconductor layer on a top surface of the substrate in the first region, a top surface of the nitride semiconductor layer being coplanar with the top surface of the substrate in second region, wherein the substrate includes bottom surface on a side opposite to the top surface, and an insulating film is provided on the top surface of the substrate in the second region, and a distance between the top surface of the nitride semiconductor layer and the bottom surface of the substrate is longer than a distance between the bottom surface of the substrate and the top surface of the substrate in the first region.