Patent ID: 9024325
Filing Date: 2015-05-05
Classification: C30B,H01L

Abstract:
1. An epitaxial substrate for use in a semiconductor element, in which a group of group-III nitride layers are laminated on a base substrate such that a (0001) crystal plane of said group of group-III nitride layers is substantially in parallel with a substrate surface of said base substrate, said epitaxial substrate comprising: a channel layer provided on the substrate; a barrier layer provided on the channel layer; an anti-diffusion layer provided on the barrier layer; and a cap layer provided on the anti-diffusion layer; wherein the channel layer is made of a first group-III nitride having a composition of In the barrier layer is made of a second group-III nitride having a composition of In the anti-diffusion layer is made of AlN and having a thickness of 3 nm or more; and the cap layer is made of a third group-III nitride having a composition of In