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Applied Physics Letters / Volume 95 / Issue 23 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 95, 231902 (2009); http://dx.doi.org/10.1063/1.3271692 (3 pages)

Wetting layer evolution upon quantum dots self-assembly

Y. Y. Cao, X. L. Li, and G. W. Yang

State Key Laboratory of Optoelectronic Materials and Technologies, Institute of Optoelectronic and Functional Composite Materials, Nanotechnology Research Center, and School of Physics and Engineering, Zhongshan (Sun Yat-sen) University, Guangzhou 510275, Guangdong, People’s Republic of China

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(Received 13 July 2009; accepted 14 November 2009; published online 7 December 2009)

A quantitatively thermodynamic model has been established to address the problem of the wetting layer evolution upon the quantum dots (QDs) self-assembly based on the embedded islands. It was found that the mismatch induced by the embedded islands breaks the balance of the strain energies between the islands and the wetting layer, and then results in the island’s volume increasing and the wetting layer’s thickness decreasing for creating a thermodynamic equilibrium upon the QD self-assembly. The stable thickness of the wetting layer can be determined by balancing the strain energies between the islands and the wetting layer. The theoretical results are in agreement with the experiments.

© 2009 American Institute of Physics

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KEYWORDS and PACS

Keywords

island structure, self-assembly, semiconductor quantum dots, thermodynamics, wetting

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3271692

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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