Patent ID: 9269813
Filing Date: 2016-02-23
CPC Classification: H01L

Claim Text:
1. A field effect transistor comprising: an active region protruding from a substrate; a gate electrode on the active region; and source/drain regions on opposite sides of the active region under the gate electrode, respectively, wherein a width of a lower portion of the gate electrode is greater than a width of an upper portion of the gate electrode; and wherein a width of a portion of the active region between and contacting the source/drain regions becomes progressively greater from a top end of the active region toward a bottom end of the active region; wherein a first separation distance between a first line and a second line and adjacent to a top end of the active region is substantially identical to a second separation distance between the first line and the second line and adjacent to a bottom end of the active region; wherein the first line has a concave slope and corresponds to an interface between the active region and one of the source/drain regions; and wherein the second line corresponds to a sidewall profile of opposing sidewalls of the gate electrode.