Patent ID: 7122871
Filing Date: 2006-10-17
Classification: H01L

Abstract:
1. A field effect transistor comprising: a fin extending from a substrate, the fin including an upper portion remote from the substrate and opposing sidewalls that extend between the upper portion and the substrate; a channel region in the fin; a gate electrode adjacent the channel region and crossing over the fin; a gate insulation layer interposed between the gate electrode and the fin; source/drain regions formed at both sides of the gate electrode, wherein the channel region at the upper portion of the fin is doped higher than sidewalls of the fin; a device isolation layer on the substrate including respective portions that extend to a respective opposing sidewall of the fin to define an opening in the device isolation layer; and a punch-through stop layer that is confined to within the opening between the portions of the device isolation layer, the punch-through stop layer having a higher doping concentration than the sidewalls of the fin in the channel region.