Control of epitaxial orientation of Si on CoSi2(111)

Template techniques for Si epitaxy are designed based on the two structures, CoSi2-C and CoSi2-S, of the CoSi2 surface. The different stacking sequences of the two CoSi2 surfaces have led to the growth of single-crystal epitaxial Si layers with either type A or type B orientation on CoSi2(111). The crystalline quality of these Si/CoSi2/Si structures far exceeds that of those reported previously. The orientation of the epitaxial Si overlayer is also found to depend on the strain in the epitaxial CoSi2 thin films.