Patent ID: 7859065
Filing Date: 2010-12-28
Classification: H01L

Abstract:
1. A field effect transistor, comprising: a semiconductor layer protruding from a substrate plane, a gate structure body comprising a gate electrode extending from one side surface through a top surface to the other side surface of the semiconductor layer such that it strides over the semiconductor layer, on the one side surface and the other side surface of the semiconductor layer, an insulating film formed between the semiconductor layer and the gate electrode, and source/drain regions formed on both sides sandwiching the gate electrode in the semiconductor layer, wherein channel regions are formed at least in the one side surface and the other side surface of the semiconductor layer, wherein the gate structure body comprises an eaves structure which is formed by extending a protrusion which projects on each side respectively of the source and drain regions in a channel length direction and which has a channel length direction width larger than a part adjacent to the insulating film in the gate electrode, at least over the top surface of the semiconductor layer in a gate electrode extending direction, and the gate structure body comprises a part, on the top surface of the semiconductor layer, where the channel length direction width reduces stepwise along a normal line direction of the top surface towards the semiconductor layer, and the gate structure body further comprises a part, on the one side surface and the other side surface of the semiconductor layer, where the channel length direction width reduces stepwise along a normal line direction of the one side surface and the other side surface of the semiconductor layer towards the semiconductor layer.