Patent ID: 8981474
Filing Date: 2015-03-17
Classification: H01L

Abstract:
1. A semiconductor device with a silicon-on-insulator substrate, the silicon-on-insulator substrate including a base layer, a semiconductor layer formed on the base layer, and a buried insulating layer interposed between the semiconductor layer and the base layer to electrically isolate the semiconductor layer from the base layer, the semiconductor device comprising: a gate insulation film formed on the semiconductor layer; a gate electrode formed on the gate insulation film, having a width extending in a first direction and a length L a plurality of source diffusion regions formed by diffusion of an impurity of a first conductivity type into the semiconductor layer on a first side of the gate electrode, the plurality of source diffusion regions being mutually aligned in the first direction; a plurality of charge collection regions formed by diffusion of an impurity of a second conductivity type differing from the first conductivity type into the semiconductor layer on the first side of the gate electrode, the plurality of charge collection regions being mutually aligned in the first direction; a drain diffusion region formed by diffusion of an impurity of the first conductivity type into the semiconductor layer on a second side of the gate electrode opposite from the first side in the second direction; a body region disposed in the semiconductor layer, the body region being surrounded by the buried insulating layer, the plurality of source diffusion regions, the plurality of charge collection regions, and the drain diffusion region; and a drift region formed in the semiconductor layer, the drift region being interposed between the body region and the drain diffusion region and having a length L the plurality of source diffusion regions and the plurality of charge collection regions are disposed in mutual alternation in the first direction; the plurality of source diffusion regions have respective widths W