Patent ID: 7576395

Claim:
An integrated circuit device, comprising: a semiconductor substrate having a first doped region and a second doped region having a different doping type than the first doped region; and a gate electrode structure on the semiconductor substrate extending between the first and second doped regions and having a gate insulation layer having a uniform composition of a first high dielectric constant material in the first doped region and a uniform composition of a second high dielectric constant material, different from the first high dielectric constant material, in the second doped region and a gate electrode on the gate insulation layer, wherein the first doped region includes a NMOS device and the second doped region includes a PMOS device and the gate insulation layer having a uniform composition of the first high dielectric constant material is on a channel region of the NMOS device and the gate insulation layer having a uniform composition of the second high dielectric constant material is on a channel of the PMOS device, wherein the first high dielectric constant material comprises at least one of hafnium silicon oxide and hafnium silicon oxynitride and wherein the second high dielectric constant material comprises at least one of hafnium aluminum oxide and hafnium aluminum oxynitride.