Patent ID: 9552992
Date: 2017-01-24
CPC Classifications: H01L

Claim:
1. A method, comprising: providing a starting semiconductor structure, the starting semiconductor structure comprising a semiconductor substrate, a plurality of fins coupled to the substrate, at least two gate structures encompassing a portion of the fins, the at least two gate structures comprising at least two gate trenches, a conformal dielectric layer covering a bottom and walls of each of the at least two gate trenches, the at least two gate trenches being partially filled over the conformal dielectric layer with work function material, a portion of the work function material being recessed; creating at least one conformal barrier layer in one or more and less than all of the at least two gate trenches; filling the at least two gate trenches with conductive material; and prior to the filling, modifying a work function of the work function material, resulting in different work functions for the at least two gate trenches with and without the conformal barrier layer.