Patent ID: 8884333

Claim:
A nitride semiconductor device comprising: a semiconductor multilayer including: at least one first nitride semiconductor layer formed on a substrate, at least one second nitride semiconductor layer formed on the first nitride semiconductor layer, and having a wider bandgap than the first nitride semiconductor layer, and a p-type third nitride semiconductor layer selectively formed on the second nitride semiconductor layer; a first ohmic electrode and a Schottky electrode spaced apart from each other on the semiconductor multilayer; a second ohmic electrode located opposite to the first ohmic electrode relative to the Schottky electrode; and a passivation film covering a top of the semiconductor multilayer, wherein the p-type third nitride semiconductor layer is formed between the first ohmic electrode and the Schottky electrode in contact with the second nitride semiconductor layer and the Schottky electrode, the first ohmic electrode is a drain electrode, the second ohmic electrode is a source electrode, the Schottky electrode is a gate electrode, and a bottom end of the drain electrode is lower than an interface between the first nitride semiconductor layer and the second nitride semiconductor layer.