Patent ID: 6921678

Claim:
A method for fabricating a nitride semiconductor, comprising the steps of: (1) growing a first semiconductor layer made of a first group III nitride over a substrate by supplying a first group III source and a group V source containing nitrogen; and (2) growing a second semiconductor layer made of a second group III nitride on the first semiconductor layer by supplying a second group III source of a plurality of group III elements and a group V source containing nitrogen, wherein at least one of the steps (1) and (2) includes the step of supplying a p-type dopant over the substrate before the growth of the semiconductor layer begins such that an area near the interface between the first p-type semiconductor layer and the second p-type semiconductor layer is grown so that the density of the p-type dopant locally increases to a peak in the second p-type semiconductor layer at a position adjacent the interface.