SOLID-PHASE EPITAXIAL-GROWTH OF GAAS ON SI SUBSTRATES

Thin films of GaAs on Si were grown by molecular beam epitaxy, which involves the solid phase epitaxial (SPE) growth of the amorphous GaAs buffer layer. A Rutherford backscattering minimum channeling yield of ∼9.4% has been obtained for a 0.8-μm-thick GaAs film. Cross-sectional transmission electron micrographs and reflection high-energy electron diffraction results have revealed that misfit dislocations are mostly confined to what used to be the buffer layer of ∼300 nm in thickness, and that the microtwins (and/or stacking faults) are mostly originated from the GaAs/Si interface and are generated during SPE growth.