Mechanisms of ring and island formation in lattice mismatched droplet epitaxy

Joanna Millunchick

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joannamm@umich.edu

2014 HH Dow

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M. DeJarld, Kris Reyes, P. Smereka, and J. M Millunchick (2013)

APPLIED PHYSICS LETTERS, 102(13).

Lattice mismatched GaSb nanostructures were grown using droplet epitaxy.In this method, liquid Ga droplets are deposited on GaAs substrates andthen exposed to a Sb flux at various temperatures. At increasingtemperature and droplet volumes, the morphologies changed fromtwo-dimensional islands to nanoholes, three-dimensional islands, rings,and clusters of islands. A theoretical model describes the relationshipbetween the volume of the droplet and the final nanostructure, and isvalidated by kinetic Monte Carlo simulations. The combined experimentaland simulation results demonstrate another process to obtain complexnanostructures, widening the design window for devices. (C) 2013American Institute of Physics. [http://dx.doi.org/10.1063/1.4799965]

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