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The binding energy of biexcitons in alloy ZnxCd1−xS quantum dots detected by femtosecond laser spectroscopy

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Abstract

Biexcitons localized at ZnxCd1−xS quantum dots (x = 0.37 or 0.45) with a diameter of ~ 45 Å synthesized by two different methods were studied by femtosecond laser spectroscopy. The spectral features of ultrafast transient absorption spectra at the short-time delay of 70 fs are associated with the three lowest energy transitions of quantum dots. The shapes of the transient absorption bands were modeled by fitting to linear absorption. The spectral positions of the absorption components of the excited state in the transient spectra take into account the energy of the biexciton coupling. By fitting the experimental transient absorption spectra of ZnxCd1−xS QDs, the binding energies of biexcitons were determined. The biexciton binding energies vary from 16.6 to 37 meV depending on the biexciton transition excited at the ZnxCd1−xS quantum dot.

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Acknowledgments

The work was supported by Russian Science Foundation Grant 17-13-01506. The authors thank Dr. D. Cherepanov for this help in analyzing the experimental data.

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Authors and Affiliations

  1. N. N. Semenov Federal Research Center for Chemical Physics, RAS, Kosygin St. 4, Moscow, Russian Federation, 119991

    Viktor Nadtochenko, Andrei Kostrov, Andrei Titov, Arseniy Aybush, Fedor Gostev, Ivan Shelaev & Denis Shepel

  2. Department of Chemistry, Lomonosov Moscow State University, Leninskiye Gory 1-3, Moscow, Russian Federation, 119991

    Viktor Nadtochenko

  3. A. N. Nesmeyanov Institute of Organoelement Compounds, RAS, 28 Vavilov St, Moscow, Russian Federation, 119991

    Olga Antonova, Sergei Kochev, Yuriy Kabachii & Pyotr Valetsky

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  1. Viktor Nadtochenko
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Correspondence to Viktor Nadtochenko.

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Nadtochenko, V., Kostrov, A., Titov, A. et al. The binding energy of biexcitons in alloy ZnxCd1−xS quantum dots detected by femtosecond laser spectroscopy. Appl. Phys. A 126, 287 (2020). https://doi.org/10.1007/s00339-020-3432-9

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