Patent ID: 9728611
Date: 2017-08-08
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: a substrate; a first GaN layer on the substrate and containing carbon; a second GaN layer on the first GaN layer and containing Fe and carbon; a third GaN layer on the second GaN layer and containing Fe and carbon; and an electron supply layer on the third GaN layer and having a larger band gap than GaN, wherein an Fe concentration of the third GaN layer gradually decreases from an Fe concentration of the second GaN layer from the second GaN layer toward the electron supply layer and is higher than 1×10 a top end of the second GaN layer is deeper than 800 nm from the bottom end of the electron supply layer, and a carbon concentration of the third GaN layer is lower than carbon concentrations of the first and second GaN layers.