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Excitons in CdS and CdSe semiconducting quantum wires with dielectric barriers

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Abstract

Features of the photoluminescence spectra observed for various polarizations and intensities of the pumping radiation and the kinetics of photoluminescence of the CdS and CdSe nanocrystals grown in hollow nanochannels of an Al2O3 matrix are explained in terms of exciton transitions in semiconducting quantum wires with dielectric barriers. The observed exciton transition energies coincide with the values calculated with an allowance for the effects of quantum confinement and the “dielectric enhancement” of excitons. The latter effect is manifested by a significant increase in the Coulomb attraction between electrons and holes (the exciton binding energy exceeds 100 meV) due to a difference between the permittivities of semiconductor and insulator. It is shown that the exciton transition energy remains constant when the quantum wire diameter varies within broad limits. This is related to the fact that a growth in the one-dimensional bandgap width of the quantum wire caused by a decrease in the diameter is compensated by an increase in the exciton binding energy.

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Authors and Affiliations

  1. Moscow State University, Moscow, 119899, Russia

    V. S. Dneprovskii, E. A. Zhukov, O. A. Shalygina & V. L. Lyaskovskii

  2. Institute of General Physics, Russian Academy of Sciences, Moscow, 117942, Russia

    E. A. Muljarov

  3. Moscow Institute of Electronic Technology (Technical University), Moscow, 103498, Russia

    S. A. Gavrilov

  4. Tsukuba University, 305-8571, Tsukuba, Japan

    Y. Masumoto

Authors
  1. V. S. Dneprovskii
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  2. E. A. Zhukov
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  3. O. A. Shalygina
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  4. V. L. Lyaskovskii
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  5. E. A. Muljarov
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  6. S. A. Gavrilov
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  7. Y. Masumoto
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Additional information

__________

Translated from Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 121, No. 6, 2002, pp. 1362–1369.

Original Russian Text Copyright © 2002 by Dneprovski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \), Zhukov, Shalygina, Lyaskovski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \), Muljarov, Gavrilov, Masumoto.

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Dneprovskii, V.S., Zhukov, E.A., Shalygina, O.A. et al. Excitons in CdS and CdSe semiconducting quantum wires with dielectric barriers. J. Exp. Theor. Phys. 94, 1169–1175 (2002). https://doi.org/10.1134/1.1493169

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  • DOI: https://doi.org/10.1134/1.1493169

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