Patent ID: 8410472
Filing Date: 2013-04-02
Classification: C30B,H01L

Abstract:
1. An epitaxial substrate for an electronic device comprising a Si single crystal substrate, a buffer as an insulating layer formed on the Si single crystal substrate, and a main laminated body formed by plural group III nitride layers epitaxially grown on the buffer, wherein a lateral direction of the epitaxial substrate is defined as an electric current conducting direction, wherein: the buffer includes at least an initially grown layer in contact with the Si single crystal substrate and a superlattice laminate constituted of a superlattice multilayer structure on the initially grown layer; the initially grown layer is made of an AlN material; the superlattice laminate is formed by alternate lamination of a first layer made of a B both of the superlattice laminate and a portion, on the buffer side, of the main laminated body has carbon concentration of 1×10