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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Equilibrium shape and size of supported heteroepitaxial nanoislands

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Author(s):
Jalkanen, J. [1] ; Trushin, O. [2] ; Granato, E. [3, 4] ; Ying, S. C. [3] ; Ala-Nissila, T. [1, 3]
Total Authors: 5
Affiliation:
[1] Helsinki Univ Technol, Dept Engn Phys, FIN-02015 Espoo - Finland
[2] Russian Acad Sci, Yaroslavl Branch, Inst Phys & Technol, Yaroslavl 150007 - Russia
[3] Brown Univ, Dept Phys, Providence, RI 02912 - USA
[4] Inst Nacl Pesquisas Espaciais, Lab Assoc Sensores & Mat, BR-12245970 Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: European Physical Journal B; v. 66, n. 2, p. 175-183, NOV 2008.
Web of Science Citations: 1
Abstract

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 particular, for large enough misfits and attractive substrate there is a Stranski-Krastanow regime, where nano-sized islands grow on top of wetting films. We analyze the various terms contributing to the total island energy in detail, and show how the competition between them leads to the optimal shape and size of the islands. Finally, we also develop an analytic interpolation formula for the various contributions to the total energy of strained nanoislands. (AU)

FAPESP's process: 07/08492-9 - Dynamics, topological defects and phase transitions in ordered media
Grantee:Enzo Granato
Support type: Research Projects - Thematic Grants