Patent ID: 7518165

Claim:
A metamorphic high electron mobility transistor, comprising: a plurality of high electron mobility transistor layers; a semi-insulating substrate; a ternary metamorphic buffer layer positioned between the semi-insulating substrate and the plurality of high electron mobility transistor layers, the ternary metamorphic buffer layer being Al 1-X Ga x Sb such that x is greater than or equal to 0.2 but less than 0.3; a stabilizing layer positioned between the ternary metamorphic buffer layer and the plurality of high electron mobility transistor layers, the stabilizing layer being Al 1-y Ga y Sb such that y is greater than 0.2 but less than or equal to 0.3 and y is greater than x; and a nucleation layer interposed between the semi-insulating substrate and the ternary metamorphic buffer layer, the nucleation layer having a first nucleation layer including GaAs grown on the semi-insulating substrate, a second nucleation layer including AlAs grown on the first nucleation layer, and a third nucleation layer including AlSb grown on the second nucleation layer; wherein the third nucleation layer is interposed between the second nucleation layer and the ternary metamorphic buffer layer.