Patent ID: 9219145
Filing Date: 2015-12-22
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor layer; a source region and a drain region of a first conductivity-type provided separated from each other in the semiconductor layer; a first conductivity-type source offset region formed in contact with the source region in the semiconductor layer and in a concentration lower than those in the source region and the drain region; a first conductivity-type drain offset region, which is disposed in contact with the drain region in the semiconductor layer and being separated from the source offset region, and is formed in a concentration lower than those in the source region and the drain region; a trench part provided between the source offset region and the drain offset region, in plan view in the semiconductor layer, and extending in a source-drain direction from the source offset region toward the drain offset region in plan view in the semiconductor layer; a gate insulating film that covers a side surface and a bottom surface of the trench part; a gate electrode that is provided at least in the trench part and is in contact with the gate insulating film; a contact which is connected to a portion of the upper surface of the gate electrode, the portion being offset from a centerline of the gate electrode in a first direction perpendicular to the source-drain direction; a back gate region of a second conductivity-type opposite to a first conductivity-type, provided so as to surround the trench part, the source offset region, the drain offset region, the source region and the drain region in plan view; and a back gate contact in contact with the back gate region, wherein, when defining the first direction as positive, and denoting a shift amount of a centerline of a region in which the trench part is disposed from a centerline of a region surrounded by the back gate region in the first direction in plan view by a trench part shift amount Δd