Patent ID: 8716754

Claim:
A nitride semiconductor device comprising: a nitride semiconductor layer formed by a heterojunction of a first nitride layer and a second nitride layer, which includes a material with a wider energy band gap than a material of the first nitride layer, and having a two-dimensional electron gas (2DEG) channel formed near a junction interface; a source electrode in ohmic contact with the nitride semiconductor layer; a drain electrode in ohmic contact with the nitride semiconductor layer while being spaced apart from the source electrode; a p-type nitride layer formed on the nitride semiconductor layer between the source and drain electrodes to be spaced apart from the respective source and drain electrodes; an n-type nitride layer formed on the p-type nitride layer; and a gate electrode formed between the source and drain electrodes to be close to the source electrode and in contact with the n-type nitride layer so that a source-side sidewall thereof is aligned with source-side sidewalls of the p-type and n-type nitride layers.