Abstract:
The polytypism between cubic and hexagonal phases in III–V semiconductor nanowires has been analyzed on the basis of nucleation theory. Model calculations have been performed for the parameters of GaAs nanowhiskers grown on Au catalysts according to the vapor-liquid-solid (VLS) mechanism. New results are obtained for the critical chemical potentials and the dependence of percentage content of wurtzite phase on the concentration of group III element (Ga) in the liquid drop. These results have been used for the interpretation of some experimental data on the crystalline phase of Au-catalyzed GaAs nanowires grown by various epitaxial techniques.