Complementary information on CdSe/ZnSe quantum dot local structure from extended X-ray absorption fine structure and diffraction anomalous fine structure measurements

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Authors

PISKORSKA-HOMMEL E. HOLÝ Václav CAHA Ondřej WOLSKA A. GUST A. KRUSE C. KROENCKE H. FALTA J. HOMMEL D.

Year of publication 2012
Type Article in Periodical
Magazine / Source Journal of Alloys and Compounds
MU Faculty or unit

Central European Institute of Technology

Citation
Web http://www.sciencedirect.com/science/article/pii/S0925838812002198
Doi http://dx.doi.org/10.1016/j.jallcom.2012.01.133
Field Solid matter physics and magnetism
Keywords CdSe; quantum dots; EXAFS; DAFS
Description The extended X-ray absorption fine structure (EXAFS) and diffraction anomalous fine structure (DAFS) have been applied to investigate a local structure for the CdSe/ZnSe quantum dots grown by molecular beam epitaxy (MBE) and migration-enhanced epitaxy (MEE). The aim was to study the intermixing of Cd and Zn atoms, chemical compositions and strain induced by cap-layer. The EXAFS at the Cd K-edge and DAFS at the Se K-edge proved the intermixing of Cd and Zn atoms. The distances Cd-Se (2.61 angstrom) found from EXAFS and DAFS analysis for h(1) region is closer to that in bulk CdSe (2.62 angstrom). The DAFS analysis revealed the differences in the local structure in two investigated regions (i.e. different iso-strain volumes) on the quantum dots. It was found that the investigated areas differ in the Cd concentration. To explain the experimental results the theoretical calculation based on a full valence-force field (VFF) model was performed. The theoretical VFF model fully explains the experimental data. (C) 2012 Elsevier B. V. All rights reserved.
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