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Mechanism of Interfacial Coarsening in Molecular Beam Epitaxy Growth on (001) Surfaces

Published online by Cambridge University Press:  17 March 2011

Leonardo Golubovic  and
Dorel Moldovan
Leonardo Golubovic
Affiliation:
Deparment of Physics, West Virginia University, Morgantown, WV 26506
Dorel Moldovan
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
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Abstract

We theoretically address epitaxial growth on (001) crystalline surfaces symmetry, in the regime when pyramids are formed across the growing interface due to Schwoebel step-edge barriers. We develop a kinetic scaling theory that analytically explains numerous experiments and simulations suggesting that pyramid size grows, via coarsening, as a fourth root of the deposition time. Pyramid dynamics is elucidated in terms of pyramid edges that form a growing self-organized square lattice across the growing interface. The edge lattice of pyramids is disordered by topological defects that are characterized here as dislocations. We show that pyramid coarsening is mediated by climb-motion of the dislocations of the edge lattice.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 648: Symposium P – Growth, Evolution & Properties of Surfaces, Thin Films, and Self Organized Structure , 2000 , P12.7
Copyright
Copyright © Materials Research Society 2001

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