Patent ID: 6812505
Filing Date: 2004-11-02
Classification: H01L

Abstract:
A semiconductor device comprising:a substrate; a buffer layer comprising GaN formed on the substrate, wherein surfaces of the buffer layer are c facets of Ga atoms; a channel layer comprising GaN or InGaN formed on the buffer layer, wherein surfaces of the channel layer are c facets of Ga or In atoms; an electron donor layer comprising AlGaN formed on the channel layer, wherein surfaces of the electron donor layer are c facets of Al or Ga atoms; a source electrode and a drain electrode formed on the electron donor layer; a cap layer comprising GaN or InGaAlN formed between the source electrode and the drain electrode, wherein surfaces of the cap layer are c facets of Ga or In atoms and at least a portion of the cap layer is in contact with the electron donor layer; and a gate electrode formed at least a portion of which is in contact with the cap layer, wherein the gate electrode is formed on the cap layer, and wherein the gate electrode has a surface area which is larger than the cap layer.