Patent ID: 8941146
Filing Date: 2015-01-27
Classification: H01L

Abstract:
1. A compound semiconductor device comprising: an electron transit layer; an electron supply layer formed over the electron transit layer; a first recessed portion and a second recessed portion formed in the electron supply layer; a chemical compound semiconductor layer including impurities that buries the first recessed portion and the second recessed portion and covers over the electron supply layer; a gate electrode formed over the electron supply layer between the first recessed portion and the second recessed portion; a source electrode formed over the chemical compound semiconductor layer which buries the first recessed portion; and a drain electrode formed over the chemical compound semiconductor layer which buries the second recessed portion, wherein, in the chemical compound semiconductor layer under the source electrode and the drain electrode, a concentration of impurities near the first and second recess portion is higher than a concentration of impurities near the gate electrode, and an insulating film is formed directly above the electron supply layer and directly below the chemical compound semiconductor layer.