Patent ID: 6713358
Filing Date: 2004-03-30
Classification: H01L

Abstract:
A method for making a semiconductor device comprising:providing a substrate; forming a high-k gate dielectric layer on the substrate; forming a silicon nitride layer on the high-k date dielectric layer; and forming a gate electrode on the silicon nitride layer; wherein the high-k gate dielectric layer is less than about 100 angstroms thick, is formed using an atomic layer chemical vapor deposition process, and comprises a material selected from the group consisting of hafnium oxide, lanthanum oxide, zirconium oxide, zirconium silicon oxide, zirconium silicate, titanium oxide, tantalum oxide, barium strontium titanium oxide, barium titanium oxide, strontium titanium oxide, yttrium oxide, aluminum oxide, lead scandium tantalum oxide, and lead zinc niobate; wherein the silicon nitride layer is less than about 40 angstroms thick and is formed using a plasma enhanced chemical vapor deposition process; wherein the gate electrode comprises polysilion; wherein the substrate comprises a silicon wafer upon which is formed a chemical oxide layer that is less than about 5 angstroms thick; and wherein the chemical oxide layer is formed by exposing the silicon wafer to a first solution that comprises hydrofluoric acid, then to a second solution that comprises hydrogen peroxide and ammonium hydroxide, and then to a third solution that comprises hydrogen peroxide and hydrochloric acid.