Patent ID: 9443939
Filing Date: 2016-09-13
CPC Classification: H01L

Claim Text:
1. A rare earth oxide buffered III-N on a silicon wafer comprising: a crystalline silicon substrate; a rare earth oxide structure deposited on the crystalline silicon substrate and including one or more layers of single crystal rare earth oxide, a lower surface of the rare earth oxide structure forming a first interface with the crystalline silicon substrate; a layer of single crystal III-N material deposited on the rare earth oxide structure so as to form a second interface between the rare earth oxide structure and the layer of single crystal III-N material, and the layer of single crystal III-N material producing a tensile stress at the second interface; and the rare earth oxide structure having a compressive stress at the first interface that is substantially zero and a compressive stress at the second interface dependent upon a thickness of the rare earth oxide structure, and the rare earth oxide structure having the thickness providing a compressive stress at the second interface offsetting at least a portion of the tensile stress at the second interface such that the thickness of the rare earth oxide structure and the thickness of the layer of single crystal III-N material are engineered to produce the silicon wafer with a substantially flat surface.