Patent ID: 7514726

Claim:
A silicon germanium (SiGe)-based semiconductive structure adapted to be grown on a {0001} C-plane of single crystalline Al 2 O 3 , comprising: a cubic diamond structure SiGe having 0.7223 atomic percent silicon and 0.2777 atomic percent germanium, said cubic diamond structure SiGe having a {111} crystal plane adapted to be grown on the {0001} C-plane such that a <110> orientation of said cubic diamond structure SiGe is aligned with a <1,0,−1,0> orientation of the {0001} C-plane; and a layer of Si 1-X Ge X on said cubic diamond structure SiGe so-grown on the {0001} C-plane, wherein X (i) defines an atomic percent of germanium satisfying 0.2277<X<1.0, (ii) is approximately 0.2777 where said layer of Si 1-X Ge X interfaces with said cubic diamond structure SiGe, and (iii) increases linearly with the thickness of said layer of Si 1-X Ge X to a maximum value X MAX .