Patent ID: 8486807

Claim:
A method comprising: forming a buffer/nucleation layer over a substrate; forming a first group-III nitride (III-nitride) layer over the buffer/nucleation layer; performing a first nitridation step on the first III-nitride layer; forming a plurality of III-nitride layers over the first III-nitride layer, wherein the step of forming the plurality of III-nitride layers comprises forming an active layer; forming a second III-nitride layer over the plurality of III-nitride layers; and performing a second nitridation step on the second III-nitride layer, wherein the first III-nitride layer, the plurality of III-nitride layers, and the second III-nitride layer comprise at least two n-type layers and at least two p-type layers, wherein each of the at least two p-type layers is nitridated by a nitridation step, and wherein none of the at least two n-type layers is nitridated.