Patent ID: 8035128
Filing Date: 2011-10-11
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a carrier traveling layer formed on a supporting substrate and made of a group-III nitride semiconductor; a carrier supplying layer formed on the carrier traveling layer and made of a group-III nitride semiconductor whose band gap energy is greater than that of the carrier traveling layer; source and drain electrodes that ohmically contact with the carrier supplying layer; an insulating film formed on the carrier supplying layer; and a gate electrode formed on the insulating film; wherein the insulating film includes a first trench formed in a region interposed between the source and the drain electrodes; the first trench has a shape whose cross-section is inverted trapezoidal in which an upper opening is wider than a bottom thereof; and the gate electrode is formed at least from the bottom of the first trench onto the insulating film on the side of the drain electrode.