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Applied Physics Letters / Volume 89 / Issue 5 / NANOSCALE SCIENCE AND DESIGN

Appl. Phys. Lett. 89, 053116 (2006); http://dx.doi.org/10.1063/1.2240114 (3 pages)

Zero-strain GaAs quantum dot molecules as investigated by x-ray diffuse scattering

M. Hanke1, M. Schmidbauer2, D. Grigoriev3, P. Schäfer3, R. Köhler3, T. H. Metzger4, Zh. M. Wang5, Yu. I. Mazur5, and G. J. Salamo5

1Martin-Luther-Universität Halle-Wittenberg, Fachbereich Physik, Hoher Weg 8, D-06120 Halle/Saale, Germany
2Institut für Kristallzüchtung, Max-Born-Straße 2, D-12489 Berlin, Germany
3Humboldt-Universität zu Berlin, Newtonstraße 15, D-12489 Berlin, Germany
4European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France
5Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701

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(Received 16 March 2006; accepted 9 June 2006; published online 2 August 2006)

The authors report on x-ray diffuse scattering at nominally strain-free GaAs(001) quantum dot molecules (QDMs). Al0.3Ga0.7As deposited by molecular beam epitaxy on GaAs(001) acts as barrier layer between the GaAs(001) substrate and subsequently grown QDMs; the adjusted thickness of 50 nm preserves the in-plane lattice parameter. Pairs of lenselike quantum dots are created with preferential orientation along [1math0] placed on shallow hills. Grazing incidence diffraction along with kinematical scattering simulations indicate completely strain-free QDs which prove a strongly suppressed intermixing between QDMs and the underlying AlGaAs barrier layer.

© 2006 American Institute of Physics

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KEYWORDS and PACS

Keywords

aluminium compounds, gallium arsenide, III-V semiconductors, semiconductor quantum dots, molecular beam epitaxial growth, semiconductor growth, X-ray scattering, texture, lattice constants

PACS

  • 68.65.Hb

    Quantum dots (patterned in quantum wells)

  • 81.15.Hi

    Molecular, atomic, ion, and chemical beam epitaxy

  • 78.70.Ck

    X-ray scattering

  • 81.40.Lm

    Deformation, plasticity, and creep

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2240114

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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