Patent ID: 8101498
Filing Date: 2012-01-24
Classification: B82Y,H01L

Abstract:
1. A method of making a substrate, comprising: providing a sintered polycrystalline material handle substrate comprising a diffusion barrier layer which prevents diffusion of a sintering material out of the sintered polycrystalline material of the handle substrate, wherein the diffusion barrier layer of silicon nitride or amorphous silicon carbide substantially encapsulates a top surface and a side surface of the handle substrate; transferring a thin single crystal layer of a first material which is suitable for epitaxial growth of a single crystal III-nitride semiconductor layer onto the handle substrate having a CTE which is closely CTE matched to a CTE of the III-nitride semiconductor layer; epitaxially growing a thick single crystal III-nitride semiconductor layer on the thin single crystal layer of the first material; and removing the handle substrate.