Patent ID: 8466029
Filing Date: 2013-06-18
Classification: H01L

Abstract:
1. A manufacturing method of a compound semiconductor device, comprising: forming a GaN based carrier transit layer over a substrate; forming a GaN based carrier supply layer over the carrier transit layer; forming a GaN based protective layer over the carrier supply layer; forming a compound semiconductor layer containing nitrogen over said protective layer; forming an insulator layer over the compound semiconductor layer; forming an opening for a source electrode, an opening for a drain electrode and an opening for a gate electrode in the insulator layer and the compound semiconductor layer; and forming electrodes in the three openings, wherein said forming the opening for the gate electrode comprises: forming a first opening in the insulator layer; and performing wet etching the compound semiconductor layer until the protective layer exposes so as to form a second opening in the compound semiconductor layer, the second opening being communicated with the first opening, and the protective layer being exposed through the first opening and the second opening.