Patent ID: 8569794
Filing Date: 2013-10-29
Classification: C23C,H01L

Abstract:
1. A Group III nitride semiconductor device which is obtained by laminating at least a buffer layer made of a Group III nitride compound and a ground layer made of a Group III nitride semiconductor, which is formed on the buffer layer, on a substrate, wherein the buffer layer is formed of a single crystalline structure, the buffer layer is made of AlN, a thickness of the buffer layer is within a range of 20 to 100 nm, a lattice constant of a-axis of the buffer layer is smaller than a lattice constant of a-axis of AlN in a bulk state, the ground layer is made of GaN and is in contact with the buffer layer, and lattice constants of the buffer layer satisfy a relationship represented by a formula (1): wherein in the formula (1), c