Patent ID: 8860084
Filing Date: 2014-10-14
Classification: H01L

Abstract:
1. An epitaxial substrate for semiconductor device, comprising a base substrate; a channel layer made of a first group-III nitride having a composition of In a barrier layer made of a second group-III nitride having a composition of In wherein the composition of said first group-III nitride is in a range determined by x1=0 and 0≦y1≦0.3, the composition of said second group-III nitride is, in a ternary phase diagram for InN, AlN, and GaN, in a range that is enclosed by straight lines represented by the following expressions and that is determined in accordance with the composition of said first group-III nitride, said barrier layer has a thickness of 3 nm or less, a low-crystallinity insulating layer is formed on said barrier layer, said low-crystallinity insulating layer being made of silicon nitride and having a thickness of 3 nm or less,