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Nucleation and dynamics of dislocations in mismatched heterostructures

Published online by Cambridge University Press:  17 March 2011

Marco Patriarca ,
Antti Kuronen  and
Kimmo Kaski
Marco Patriarca
Affiliation:
Helsinki University of Technology, Laboratory of Computational Engineering P.O.Box 9400, FIN-02015 HUT, FINLAND
Antti Kuronen
Affiliation:
Helsinki University of Technology, Laboratory of Computational Engineering P.O.Box 9400, FIN-02015 HUT, FINLAND
Kimmo Kaski
Affiliation:
Helsinki University of Technology, Laboratory of Computational Engineering P.O.Box 9400, FIN-02015 HUT, FINLAND
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Abstract

In this paper we have investigated, through computer simulations, dislocation nucleation and dislocation dynamics in a heterostructure system with the lattice-mismatch interface, i.e. a system with internal strain. In particular, we have studied the dependence of the nucleation thresholds on the basic parameters of the crystals, such as the amount of mismatch and the system temperature. These studies have been carried out by using the simulation code with a graphical user interface developed at our laboratory. This on-line simulation system produces a real time interactive visualization of the 3-D Molecular Dynamics model. Furthermore, it detects the presence of dislocations and tracks them by an algorithm based on potential energy mapping.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 696: Symposium N – Current Issues in Heteroepitaxial Growth--Stress Relaxation and Self Assembly , 2001 , N4.4
Copyright
Copyright © Materials Research Society 2002

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