Patent ID: 8445891

Claim:
A nitride based semiconductor device, comprising: a base substrate; an epitaxial growth layer disposed on the base substrate and generating 2-dimensional electron gas (2DEG) therein; and an electrode structure disposed on the epitaxial growth layer and having a schottky electrode the schottky electrode contacting the epitaxial growth layer and an ohmic electrode the ohmic electrode contacting the epitaxial growth layer, wherein the epitaxial growth layer includes a depressing part depressed thereinto from the surface of the epitaxial growth layer and the schottky electrode having an extension extending into the depressing part, and the depressing part consists of: a first area in which the extension is disposed; and a second area that is an area other than the first area and is disposed to approach the ohmic electrode, as compared with the first area, and wherein lateral surfaces of the extension excepting a lateral surface directed toward the ohmic electrode contact with the 2-dimensional electron gas (2DEG).