Patent ID: 9224754
Filing Date: 2015-12-29
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a first channel comprising an N-type material raised above a substrate, the first channel having a first top surface, a first pair of sidewalls, and a first current flow direction along a first major axis of the first channel; a second channel comprising a P-type material raised above the substrate, the second channel having a second top surface, a second pair of sidewalls, and a second current flow direction along a second major axis of the second channel; a first gate wrapped around the first top surface and the first pair of sidewalls of the first channel, wherein the first gate comprises a first metal fill that exerts a tensile stress upon the first channel such that charge carrier mobility in the first channel is improved in the first current flow direction; and a second gate wrapped around the second top surface and the second pair of sidewalls of the second channel, wherein the second gate comprises a second metal fill that exerts a compressive stress upon the second channel such that charge carrier mobility in the second channel is improved in the second current flow direction, wherein the first metal fill and the second metal fill are different metals.