Unified model of droplet epitaxy for compound semiconductor nanostructures: Experiments and theory

作者：Reyes Kristofer^*; Smereka Peter; Nothern Denis; Millunchick Joanna Mirecki; Bietti Sergio; Somaschini Claudio; Sanguinetti Stefano; Frigeri Cesare

来源：Physical Review B, 2013, 87(16): 165406.

DOI：10.1103/PhysRevB.87.165406

We present a unified model of compound semiconductor growth based on kinetic Monte Carlo simulations in tandem with experimental results that can describe and predict the mechanisms for the formation of various types of nanostructures observed during droplet epitaxy. The crucial features of the model include the explicit and independent representation of atoms with different species and the ability to treat solid and liquid phases independently. Using this model, we examine nanostructural evolution in droplet epitaxy. The model faithfully captures several of the experimentally observed structures, including compact islands and nanorings. Moreover, simulations show the presence of Ga/GaAs core-shell structures that we validate experimentally. A fully analytical model of droplet epitaxy that explains the relationship between growth conditions and the resulting nanostructures is presented, yielding key insight into the mechanisms of droplet epitaxy. DOI: 10.1103/PhysRevB.87.165406

• 出版日期2013-4-4