Patent ID: 8735987
Filing Date: 2014-05-27
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device comprising: providing a substrate having a surface comprising a first semiconductor material, the surface having formed therein a first active region and a second active region, the first active region comprising a first substantially undoped layer at the surface and a first highly doped screening layer of a first conductivity type beneath the first substantially undoped layer, and the second active region comprising a second substantially undoped layer at the surface and a second highly doped screening layer of a second conductivity type beneath the second substantially undoped layer; forming at least one gate dielectric layer over the surface; forming a layer of a first metal over the dielectric layer, the first metal having a workfunction that is substantially midgap with respect to the semiconductor material; and forming a gate stack having a workfunction that is substantially midgap with respect to the semiconductor material in each of the first active region and the second active region comprising the at least one gate dielectric layer and the layer of the first metal.