Patent ID: 8841184

Claim:
A method of forming a multi-layer structure for a semiconductor device the method comprising: forming an interface layer on a semiconductor substrate; forming a first high-k dielectric layer comprising a first metal element on the interface layer; forming a second high-k dielectric layer comprising at least one of aluminum and lanthanum on the first high-k dielectric layer; and annealing the first high-k dielectric layer and the second high-k dielectric layer such that the first metal element and the one of aluminum or lanthanum are mixed to form a combined high-k dielectric layer, wherein the combined high-k dielectric layer is represented by a formula of A y B 1−y O z , wherein 0<y<1 and the value of y is decreased from an interface between the interface layer and a bottom surface of the combined high-k dielectric layer towards an upper surface of the combined high-k dielectric layer, wherein A is a group IV metal and B is a group XIII metal.