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Thickness-dependent surface energy and formation of epitaxial quantum dots

journal contribution
posted on 12.11.2020, 14:17 by Kirill A Lozovoy, Ying Zhou, Roger Smith, Adam Lloyd, Andrey P Kokhanenko, Vladimir V Dirko, Nataliya Yu Akimenko, Denis V Grigoryev, Alexander V Voitsekhovskii
© 2020 Elsevier B.V. Numerous theoretical and experimental studies show that during epitaxial growth according to the Stranski-Krastanow mechanism in systems mismatched by the lattice constant, the change in the surface energy of the system during nucleation and further growth of quantum dots, plays the most important role. In particular, this factor determines the equilibrium and critical thicknesses of the transition from two-dimensional to three-dimensional growth, and also affects other kinetic characteristics of the ensemble of nanoclusters, including the nucleation rate, surface density, and average size of the islands. Recent theoretical studies have made it possible to determine that the surface energy in this process depends on the thickness of the material deposited on the substrate. In this paper, we construct a kinetic model of the formation and coherent growth of two-dimensional layers and quantum dots in mismatched epitaxial systems, taking into account the dependence of the specific surface energies on the thickness of the deposited material. In this approximation, we calculate the basic parameters of the formed array of nanoislands. Experimental studies were also carried out on the growth of two-dimensional layers and quantum dots of germanium on the silicon (100) surface. The results of experimental investigations confirm the proposed theoretical model.

History

School

  • Science

Department

  • Mathematical Sciences

Published in

Thin Solid Films

Volume

713

Publisher

Elsevier BV

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Thin Solid Films and the definitive published version is available at https://doi.org/10.1016/j.tsf.2020.138363

Acceptance date

25/09/2020

Publication date

2020-09-30

Copyright date

2020

ISSN

0040-6090

eISSN

1879-2731

Language

en

Location

Korean Inst Elect & Elect Mat Engineers, Jeju, SOUTH KOREA

Depositor

Prof Roger Smith Deposit date: 11 November 2020

Article number

138363

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