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

Joanna Millunchick

Professor

joannamm@umich.edu

2014 HH Dow

T: (734) 647-8980

Bio

Publications

Group

Projects


Kristofer Reyes, Peter Smereka, Denis Nothern, Joanna M Millunchick, Sergio Bietti, Claudio Somaschini, Stefano Sanguinetti, and Cesare Frigeri (2013)

PHYSICAL REVIEW B, 87(16).

We present a unified model of compound semiconductor growth based onkinetic Monte Carlo simulations in tandem with experimental results thatcan describe and predict the mechanisms for the formation of varioustypes of nanostructures observed during droplet epitaxy. The crucialfeatures of the model include the explicit and independentrepresentation of atoms with different species and the ability to treatsolid and liquid phases independently. Using this model, we examinenanostructural evolution in droplet epitaxy. The model faithfullycaptures several of the experimentally observed structures, includingcompact islands and nanorings. Moreover, simulations show the presenceof Ga/GaAs core-shell structures that we validate experimentally. Afully analytical model of droplet epitaxy that explains the relationshipbetween growth conditions and the resulting nanostructures is presented,yielding key insight into the mechanisms of droplet epitaxy. DOI:10.1103/PhysRevB.87.165406

Document Actions