Patent ID: 9190471
Filing Date: 2015-11-17
Classification: H01L

Abstract:
1. A semiconductor structure comprising: a semiconductor wafer comprising a gate structure, a first trench in the semiconductor wafer adjacent to a first side of the gate structure and a second trench adjacent to a second side of the gate structure, the first and second trenches each having vertical sides at a 90 degree angle with respect to a bottom of the trench and filled with an epitaxial silicon that is not an alloy or compound of silicon and is doped to form a doped epitaxial silicon to form a source in the filled first trench and a drain in the filled second trench such that each of the source and drain are recessed and have an inverted facet wherein the inverted facet comprises vertical side walls at the vertical sides at an outer periphery of the source and drain and angled walls that extend from the vertical side walls towards a center and a bottom of the source and drain.