Physics – Condensed Matter – Materials Science
Scientific paper
2002-08-15
Chapter in "Atomistic Aspects of Epitaxial Growth", Eds. M. Kotrla, N.I. Papanicolaou, D.D. Vvedensky and L.T. Wille, NATO Sci
Physics
Condensed Matter
Materials Science
16 pages, 8 figures, presented at NATO Advanced Research Workshop on Atomistic Aspects of Epitaxial Growth, Dassia, Corfu, Gre
Scientific paper
Accounting for the anharmonicity of the real interatomic potentials in a model in 1+1 dimensions shows that coherent 3D islands can be formed on the wetting layer in a Stranski-Krastanov growth mode predominantly in compressed overlayers. Coherent 3D islanding in expanded overlayers could be expected as an exception rather than as a rule. The thermodynamic driving force of formation of coherent 3D islands on the wetting layer of the same material is the weaker adhesion of the atoms near the islands edges. The average adhesion gets weaker with increasing island's thickness but reaches a saturation after several monolayers. A misfit greater than a critical value is a necessary condition for coherent 3D islanding. Monolayer height islands with a critical size appear as necessary precursors of the 3D islands. The 2D-3D transformation from monolayer-high islands to three-dimensional pyramids takes place through a series of stable intermediate 3D islands with discretely increasing thickness.
Markov Ivan
Prieto Jose Emilio
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