Patent ID: 7989854

Claim:
A semiconductor device comprising: a semiconductor substrate including an active region surrounded by an isolation structure; a stack structure protruding from the active region in the semiconductor substrate, the stack structure including an active layer pattern and a gap-filling insulation layer between the active region and the active layer pattern, wherein the active layer pattern includes a channel region located at a portion of the stack structure, and impurity regions located at both sides of the channel region; a gate electrode extending from the isolation structure around the stack structure to cover a top surface and first sidewalls of the channel region of the stack structure, and not to cover the impurity regions of the stack structure; a first spacer on sidewalls of the gate electrode; and a second spacer on sidewalls of the impurity regions of the stack structure and on sidewalls of gap-filling insulation layer under the impurity regions, wherein the active layer pattern is supported by the gate electrode, and wherein a top surface of the gap-filling insulation layer is higher than an interface surface between the isolation structure and the gate electrode.