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Interface Engineering in Type-II CdSe/BeTe Quantum Dots

Published online by Cambridge University Press:  17 March 2011

Sergey V. Ivanov
Affiliation:
Ioffe Physico-Technical Institute of RAS, St.Petersburg 194021, RUSSIA
Tatiana V. Shubina
Affiliation:
Ioffe Physico-Technical Institute of RAS, St.Petersburg 194021, RUSSIA
Sergey V. Sorokin
Affiliation:
Ioffe Physico-Technical Institute of RAS, St.Petersburg 194021, RUSSIA
Alexey A. Toropov
Affiliation:
Ioffe Physico-Technical Institute of RAS, St.Petersburg 194021, RUSSIA
Reginald N. Kyutt
Affiliation:
Ioffe Physico-Technical Institute of RAS, St.Petersburg 194021, RUSSIA
Alla A. Sitnikova
Affiliation:
Ioffe Physico-Technical Institute of RAS, St.Petersburg 194021, RUSSIA
Magnus Willander
Affiliation:
University of Technologyand Göteborg University, S-412 96 Göteborg, SWEDEN
Andreas Waag
Affiliation:
Abteilung Halbleiterphysik, Universität Ulm, 89081 Ulm, GERMANY
Gotfried Landwehr
Affiliation:
Physikalisches Institut der Universität Würzburg, D-97074 Würzburg, GERMANY
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Abstract

Stressor-controlled epitaxy has been proposed as an efficient method of CdSe quantum dot fabrication. The studies are performed on a type-II CdSe/BeTe system, where CdTe and BeSe inteface bonds play a role of intrinsic stressors. Predeposition of ~0.2 ML CdTe stressor ( Δ a/a= +15%), corresponding to a local maximum of RHEED specular spot intensity, appears to induce variation of stress field across the BeTe surface, caused by alternating regions with CdTe and BeSe bonds. It results in preferential nucleation of regularly arranged CdSe QDs at the BeSe sites with the following vertical chess-ordering in the CdSe/BeTe multilayers. The structures demonstrate bright up to RT PL in the 1.9-2.1 eV range and strong in-plane PL anisotropy related to non-equivalent bottom and top CdSe QD interfaces having estimated from x-ray diffraction total concentrations of CdTe and BeSe bonds of 0.3-0.4 and 0.6-0.7 ML, respectively.

Type
Research Article
Copyright
Copyright © Materials Research Society 2002

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