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We present a model which allows for the self-consistent determination of the
stationary group III and V concentrations in the droplet and the contact angle versus the group III
and V fluxes during the Au-catalyzed vapor-liquid-solid growth of III-V nanowires. The
nanowire axial growth rate in the mononuclear regime is taken in the Zeldovich form. Chemical
potentials of the group III and V atoms in liquid are considered within the regular solution model.
We show how the group III content and the droplet contact angle can be increased be either
decreasing group V flux or increasing group III flux. The group V concentration usually
decreases for higher contact angles. Overall, these results can be used for modeling and fine
tuning of the droplet shapes and compositions influencing the morphology and the preferred
crystal structure of Au-catalyzed III-V nanowires in different epitaxy techniques.
Keywords: III-V nanowires; droplet composition; contact angle; VLS growth. |
full paper (pdf, 880 Kb)