Patent ID: 8648389

Claim:
A semiconductor device, comprising: a substrate; a channel layer made of GaN and formed on the substrate,; a spacer layer made of AlN and formed in the channel layer, the spacer layer forming a two-dimensional electron gas (2DEG) in the channel layer at the interface to the spacer layer; and a doped layer made of InAlN and formed on the spacer layer, the doped layer having a composition of indium (In) greater than, or equal to 12% and less than, or equal to 18%, wherein the spacer layer has a thickness greater than, or equal to 0.5 nm and thinner than, or equal to 0.8 nm, and wherein the doped layer has a Haze index less than 50 ppm, and the 2DEG has sheet resistance less than 300 Ω/□.