Patent ID: 9153658
Filing Date: 2015-10-06
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor layer; a gate insulating film in contact with the semiconductor layer with an interface formed therebetween; and a gate electrode layer in contact with the insulating film with an interface formed therebetween on a side opposite to the semiconductor layer, wherein asperity of the interface between the semiconductor layer and the gate insulating film and asperity of the interface between the gate insulating film and the gate electrode layer each have a size which decreases correspondingly as a thickness of the gate insulating film decreases in a region of a length of 1 μm in a direction parallel to a direction in which the gate insulating film extends; wherein the size of the asperity of the interface between the semiconductor layer and the gate insulating film is 10% or less of the thickness of the gate insulating film and the size of the asperity of the interface between the gate insulating film and the gate electrode layer is 10% or less of the thickness of the gate insulating film.