Patent ID: 9608075
Date: 2017-03-28
CPC Classifications: H01L

Claim:
1. A compound semiconductor device, comprising: a first III-nitride buffer layer doped with carbon and/or iron; a second III-nitride buffer layer above the first III-nitride buffer layer and doped with carbon and/or iron; a first III-nitride device layer above the second III-nitride buffer layer; and a second III-nitride device layer above the first III-nitride device layer and having a different band gap than the first III-nitride device layer, wherein a two-dimensional charge carrier gas arises along an interface between the first and second III-nitride device layers, wherein the first III-nitride buffer layer has an average doping concentration of carbon and/or iron which is greater than that of the second III-nitride buffer layer, wherein the second III-nitride buffer layer has an average doping concentration of carbon and/or iron which is comparable to or greater than that of the first III-nitride device layer.