Issue |
Europhys. Lett.
Volume 63, Number 2, July 2003
|
|
---|---|---|
Page(s) | 268 - 274 | |
Section | Condensed matter: structure, mechanical and thermal properties | |
DOI | https://doi.org/10.1209/epl/i2003-00513-x | |
Published online | 01 November 2003 |
On the driving forces for the vertical alignment in nitride quantum dot multilayers
1
European Synchrotron Radiation Facility - BP
220, 38043 Grenoble Cedex, France
2
Experimentelle Physik I, Universität Dortmund - Otto
Hahn Str. 4, 44221 Dortmund
3
Institute of Condensed
Matter Physics, Masaryk University 61137 Brno, Czech Republic
4
CEA-CNRS group, “Nanophysique et semiconducteurs”
Département de Recherche Fondamentale sur la Matière
Condensée, CEA/Grenoble 17 rue des Martyrs, 38054 Grenoble
Cedex 9, France
Corresponding author: chamard@physik.uni-dortmund.de
Received:
6
January
2003
Accepted:
14
May
2003
The layer-to-layer vertical alignment of quantum dots
in
multilayers is quantified as a function of the
spacer layer thickness and the number of bilayers, using
grazing-incidence X-ray scattering. Although the density of dots
is comparable to the density of (0001) threading dislocations, we
observe that the strong vertical ordering is strain induced by
the buried dots. Elasticity theory calculations confirm this
experimental result and explain the observation of the
exceptionally strong vertical alignment in nitride compared to
other classical systems.
PACS: 68.55.Ac – Nucleation and growth: microscopic aspects / 61.10.Eq – X-ray scattering (including small-angle scattering) / 61.72.Lk – Linear defects: dislocations, disclinations
© EDP Sciences, 2003
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