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2000

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/10867

Coherent Stranski-Krastanov growth in 1+1 dimensions with anharmonic interactions: An equilibrium study

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Recurs relacionat

http://dx.doi.org/10.1103/PhysRevB.61.16890

Resum

The formation of coherently strained three-dimensional (3D) islands on top of the wetting layer in the Stranski-Krastanov mode of growth is considered in a model in 1 + 1 dimensions accounting for the anharmonicity and nonconvexity of the real interatomic forces. It is shown that coherent 3D islands can be expected to form in compressed rather than expanded overlayers beyond a critical lattice misfit. In expanded overlayers the classical Stranski-Krastanov growth is expected to occur because the misfit dislocations can become energetically favored at smaller island sizes. The thermodynamic reason for coherent 3D islanding is incomplete wetting owing to the weaker adhesion of the edge atoms. Monolayer height islands with a critical size appear as necessary precursors of the 3D islands. This explains the experimentally observed narrow size distribution of the 3D islands. The 2D-3D transformation takes place by consecutive rearrangements of mono- to bilayer, bi- to trilayer islands, etc., after the corresponding critical sizes have been exceeded. The rearrangements are initiated by nucleation events, each one needing to overcome a lower energetic barrier than the one before. The model is in good qualitative agreement with available experimental observations.

Matèries

Superfícies (Física), Interfícies (Ciències físiques), Pel·lícules fines, Nanotecnologia

Matèries (anglès)

Interfaces (Physical sciences), Surfaces (Physics), Thin films, Nanotechnology

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Articles publicats en revistes (Física de la Matèria Condensada)

Citació

KORUTCHEVA, E., TURIEL MARTÍNEZ, Antonio M. and MARKOV, I. Coherent Stranski-Krastanov growth in 1+1 dimensions with anharmonic interactions: An equilibrium study. Physical Review B. 2000. Vol. 61, num. 24, pags. 16890-16901. ISSN 0163-1829. [consulted: 4 of August of 2026]. Available at: https://hdl.handle.net/2445/10867

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