Patent ID: 7700420
Filing Date: 2010-04-20
Classification: H01L

Abstract:
1. A method for forming a semiconductor structure, comprising: providing a substrate having a first semiconductor layer, an insulating layer over the first semiconductor layer, and a second semiconductor layer over the insulating layer, the substrate having a first region and a second region, wherein the first semiconductor layer has a first crystal surface orientation and the second semiconductor layer has a second crystal surface orientation different from the first surface crystal orientation; forming an opening in the first region extending through the insulating layer and into the first semiconductor layer; epitaxially growing a transition layer in the opening so that the transition layer has the first crystal surface orientation; epitaxially growing a buffer layer over the transition layer in the opening so that the transition layer has the first crystal surface orientation; epitaxially growing a III-nitride layer over the buffer layer so that the transition layer has the first crystal surface orientation; forming a first transistor in and on the III-nitride layer in the first region; and forming a second transistor in and on the second semiconductor layer in the second region.