Patent ID: 7372066

Claim:
A gallium nitride-based compound semiconductor device comprising: a substrate; a first superlattice layer which is formed above the substrate and in which an n-type AlGaN layer and an n-type GaN layer are alternately layered; a multiple quantum well layer which is formed above the first superlattice layer and in which a GaN-based quantum well layer and a GaN-based quantum barrier layer are alternately layered; a second superlattice layer which is formed above the multiple quantum well layer and in which a p-type AlGaN layer and a p-type GaN layer are alternately layered; a buffer layer, a first GaN-based layer which is formed above the buffer layer, and an n-type GaN-based layer which is formed above the first GaN-based layer are provided between the substrate and the first superlattice layer; a second GaN-based layer is provided between the first superlattice layer and the multiple quantum well layer; and a p-type GaN layer is provided above the second superlattice layer; wherein the first GaN-based layer has a structure in which an SiN layer is inserted in a GaN layer, and the second GaN-based layer has an AlGaN layer.