Patent ID: 9082817
Filing Date: 2015-07-14
Classification: H01L

Abstract:
1. A method comprising: providing a semiconductor substrate comprised of a material selected from the group of silicon, sapphire, or silicon carbide; forming a nucleation layer over the substrate wherein, the nucleation layer is composed of aluminum nitride; forming a buffer layer over the nucleation layer, comprising a plurality of separated first epitaxial regions wherein, the plurality of separated first epitaxial regions form isolated component islands wherein, the component islands are configured to provide a starting surface structured to minimize dislocations; forming a second epitaxial layer directly on the first epitaxial layer, each of the epitaxial layers comprising at least one Group III-nitride, the first and second epitaxial layers collectively forming the buffer, wherein the buffer is comprised of multiple separated buffer regions of the first epitaxial layer and the second epitaxial layer; forming a device layer or portion of the device layer in which at least part of a semiconductor device is formed, wherein the device layer is selected from an individual layer or as part of another layer; doping the portion of the device layer with one or more dopants to form a source, a drain, or other transistor regions; and forming one or more conductive layers over the transistor region, patterning and etching to form source and drain contacts.