Patent ID: 8853751

Claim:
A semiconductor structure comprising: a high mobility semiconductor layer formed over a semiconductor substrate, wherein the high mobility semiconductor layer comprises one of Ge, GaAs, InGaAs, InP, InSb, InAs, AIGaAs, and InAIAs; an interfacial oxide layer formed over-the high mobility semiconductor layer; a high dielectric constant (high-k) dielectric layer formed over the interfacial oxide layer; a stack formed over the high-k dielectric layer, wherein the stack comprises a lower metal layer formed on the high-k layer, a material layer comprising a material formed on the lower metal layer, and an upper metal layer formed on the material layer, wherein the material layer consists one of B, C, P, Si, and Th, and wherein the material layer is selected based on at least the high mobility semiconductor layer, wherein a Gibbs free energy change of a chemical reaction, in which an atom constituting the high mobility semiconductor layer that directly contacts the interfacial oxide layer combines with a metal oxide material comprising the material and oxygen to form the material in elemental form and oxide of the atom constituting the high mobility semiconductor layer that directly contacts the interfacial oxide layer, is positive; and a gate electrode and a gate dielectric, wherein the gate electrode is formed by patterning the stack, and wherein the gate dielectric includes a portion of the high-k dielectric layer.