Patent ID: 7576399
Filing Date: 2009-08-18
Classification: H01L

Abstract:
1. A transistor device, comprising: a workpiece; a first gate dielectric disposed over the workpiece, the first gate dielectric having a bottom surface facing towards said workpiece and comprising a graded concentration of a metal, said graded concentration of a metal comprising metal molecules that migrate from an abutting layer of a selected metal; a gate disposed over the top surface of said first gate dielectric, the gate comprising a combined layer of a semiconductive material and molecules of metal that diffuse from said layer of a selected metal; the layer of selected metal abutting said first gate dielectric and providing said molecules that migrate to said first gate dielectric and that diffuse into said semiconductor material; and wherein the first gate dielectric comprises a first concentration of the metal proximate the bottom surface of the gate dielectric and a second concentration of the metal proximate the gate, wherein the second concentration is greater than the first concentration.