Patent ID: 8410555

Claim:
A Complementary Metal-Oxide-Semiconductor Field Effect Transistor (CMOSFET) device, comprising: a semiconductor substrate; an interface layer grown on the semiconductor substrate; a first high-k gate dielectric layer deposited on the interface layer; a metal layer deposited on the first high-k gate dielectric layer; a second high-k gate dielectric layer deposited on the metal layer; and a gate electrode layer deposited on the second high-k gate dielectric layer; wherein the metal lager is configured to generate positive or negative charges in the high- k Rate dielectric layers and also interface dipoles between the first high-k gate dielectric lager and interface layer; and wherein for a N-type Metal Oxide Semiconductor (NMOS) device and a P-type Metal Oxide Semiconductor (PMOS) device, the materials for the metal layer are different, wherein for the NMOS device, the materials for the metal layer comprises any one of rare earth metal Y, La, Dy and Gd, and for the PMOS device, the materials for the metal layer comprises any one of metals Al, Mg and Hf.