Patent ID: 8552531
Filing Date: 2013-10-08
Classification: C30B,H01L

Abstract:
1. A nitride-based compound semiconductor, comprising: a substrate; a buffer layer formed on the substrate; and a channel layer including gallium nitride (GaN) and formed on the buffer layer, wherein a Ga vacancy density in the channel layer is no less than 10 impurity atoms of a metal are doped across the entire channel layer, each of the impurity atoms having, in a GaN crystal of the channel layer, a bonding energy with a Ga interstitial atom that is greater than an activation energy for diffusion of the Ga interstitial atom and a cohesive energy that is equal to or lower than a cohesive energy of the GaN crystal without the impurity atom, at least one of the impurity atoms forms a compound with at least one Ga interstitial atom in the GaN crystal of the channel layer, the buffer layer does not contain impurity atoms of the metal, the metal is Fe, and a doping concentration of the impurity atoms is no less than 5×10