Patent ID: 7081409

Claim:
A method for forming a gate electrode comprising: forming a dielectric layer having a high dielectric constant on a substrate; thermally treating the substrate at a sufficient temperature to remove impurities from the dielectric layer, modify stoichiometry within the dielectric layer and/or increase a degree of crystallinity within the dielectric layer; providing a tantalum amine derivative to the dielectric layer and introducing a reacting gas comprising at least one of H 2 , N 2 , NH 3 , SiH 4 or Si 2 H 6 to the dielectric layer to form a metal barrier layer having a work function of about 3.9 eV to about 5.5 eV wherein the tantalum amine derivative comprises Ta(NC(CH 3 ) 2 C 2 H 5 )(N(Ch 3 ) 2 ) 3 ) forming a gate metal layer on the metal barrier layer; and patterning the gate metal layer and the metal barrier layer to form a gate metal pattern and a metal barrier pattern.