US Patent 9614068 Semiconductor device and method of fabricating the same

A semiconductor device includes a first active region, a field insulating layer disposed in the first active region, a first nanowire pattern disposed on the first active region and extended in a first direction, and a first gate disposed on the first active region and extended in a second direction crossing the first direction. The first gate covers the first nanowire pattern. The semiconductor device further includes a source or drain epitaxial layer disposed on at least one side of the first nanowire pattern. The first gate includes a first region disposed on the first nanowire pattern and having a first width, and a second region disposed beneath the first nanowire pattern and having a second width wider than the first width.