Patent ID: 8269278

Claim:
A semiconductor device with a π-shaped semiconductor conductive layer, comprising: a silicon-on-insulator (SOI) substrate, having a silicon substrate, a first insulating barrier layer, and a first silicon layer, wherein the first insulating barrier layer is located on the silicon substrate, and the first silicon layer is located on the first insulating barrier layer; a gate unit, located on the first silicon layer; a spacing layer, covering the gate unit; a second silicon layer, covering the silicon substrate and two opposite sides of the first insulating barrier layer and the first silicon layer; a second insulating barrier layer, located directly on the second silicon layer and spaced by the second silicon layer to be located at opposite positions on the two opposite lateral edges of the first insulating barrier layer; and a source and a drain, located directly on the second insulating barrier layer, and connected to the first silicon layer through the second silicon layer, wherein the source, the drain, the first silicon layer, and the second silicon layer form the π-shaped semiconductor conductive layer, wherein the π-shaped semiconductor conductive layer comprises two vertical members extending normal to an active surface and separated from each other, with a horizontal member extending between the tops of the two vertical members.