Strain-induced energy gap variation in ZnTe/ZnMgTe core/shell nanowires

Strain-induced energy gap variation in ZnTe/ZnMgTe core/shell nanowires

Strain-induced changes of ZnTe energy gap in ZnTe/ZnMgTe core/shell nanowires arising from lattice mismatch between the core and the shell semiconductor are studied by means of optical methods. It is shown that the increase of the Mg content in the shell, as well as the increase of the shell thickne...

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Bibliographic Details
Published in:Applied physics letters Vol. 104; no. 16
Main Authors: Wojnar, P., Zielinski, M., Janik, E., Zaleszczyk, W., Wojciechowski, T., Wojnar, R., Szymura, M., Kłopotowski, Ł., Baczewski, L. T., Pietruchik, A., Wiater, M., Kret, S., Karczewski, G., Wojtowicz, T., Kossut, J.
Format: Journal Article
Language:English
Published: Melville American Institute of Physics 21-04-2014
Subjects:
Applied physics
Energy gap
Magnesium
Nanowires
Optics
Photoluminescence
Red shift
Shells
Tensile strain
Zinc tellurides
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Summary:Strain-induced changes of ZnTe energy gap in ZnTe/ZnMgTe core/shell nanowires arising from lattice mismatch between the core and the shell semiconductor are studied by means of optical methods. It is shown that the increase of the Mg content in the shell, as well as the increase of the shell thickness result in an effective redshift of the near band edge photoluminescence from ZnTe nanowire cores, which reflects directly the decrease of energy gap under tensile strain conditions. The conclusions are supported by theoretical calculations in terms of the valence force field model. The observed change of ZnTe energy gap can be as large as 120 meV with respect to the unstrained conditions and can be tuned in a continuous manner by adjusting shell parameters, which open a path towards an effective band gap engineering in these structures.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4873355