Equilibrium shape and dislocation nucleation in strained epitaxial nanoislands
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منابع مشابه
Surface Instability and Dislocation Nucleation in Strained Epitaxial Layers
We have studied numerically the stability and defect nucleation in epitaxial layers on a substrate with lattice mismatch. Stress relaxation and energy barriers for mis t dislocation nucleation are estimated using modern methods for saddle point search based on a combination of activation with local repulsive potential and the Nudged Elastic Band method. Stress relaxation processes correspond to...
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J. Jalkanen 1, O. Trushin 2, E. Granato 3, S.C. Ying 4, and T. Ala-Nissila 1,4 1 Laboratory of Physics, P.O. Box 1100, Helsinki University of Technology, FIN–02015 HUT, Espoo, Finland 2 Institute of Microelectronics and Informatics, Academy of Sciences of Russia, Yaroslavl 150007, Russia 3 Laboratório Associado de Sensores e Materiais, Instituto Nacional de Pesquisas Espaciais, 12245-970 São Jo...
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We study the equilibrium shape, shape transitions and optimal size of strained heteroepitaxial nanoislands with a two-dimensional atomistic model using simply adjustable interatomic pair potentials. We map out the global phase diagram as a function of substrate-adsorbate misfit and interaction. This phase diagram reveals all the phases corresponding to different well-known growth modes. In part...
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