Patent ID: 7906814

Claim:
A FinFET (fin field effect transistor) having low leakage current comprising: a bulk silicon substrate; a fence-shaped body which is formed by patterning the substrate and has a shape of a fence having predetermined height, width, and length; an insulating layer which is made of an insulating material and is formed on a surface of the substrate to a first height of the fence-shaped body; a gate insulating layer formed at side walls and an upper surface of the fence-shaped body protruding from the insulating layer; a gate electrode formed on the gate insulating layer and the insulating layer to be perpendicular to a direction of the length of the fence-shaped body; and source/drain formed at regions of the fence-shaped body where the gate electrode is not formed, wherein the gate electrode includes a first gate electrode and a second gate electrode electrically connected to the first gate electrode, the second gate electrode has a work function lower than that of the first gate electrode, and the second gate electrode is formed at a side surface of the first gate electrode to be close to the drain.