Patent ID: 8384159

Claim:
A semiconductor device comprising: a substrate; a first dielectric layer formed directly on the substrate and formed of a first high-k material, the first high-k material selected from the group consisting of HfO 2 , HfSiO, HfTaO, HfTiO, HfTiTaO, HfAlON, and HfZrO; a second dielectric layer formed over the first dielectric layer and formed of a second high-k material, the second high-k material being different than the first high-k material and selected from the group consisting of HfO 2 , HfSiO, HfSiON, HfTaO, HfTiO, HfTiTaO, HfAlON, and HfZrO; and a metal gate formed over the second dielectric layer; wherein the first dielectric layer includes ions of an element not present in the first high-k material.