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Recombination Kinetics of Excitons and Trions in Free-Standing CdS Quantum Dots Synthesized by the Langmuir–Blodgett Method

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Abstract

CdS quantum dots prepared by the Langmuir–Blodgett method have been investigated using UV spectroscopy and time-resolved photoluminescence. It has turned out that at temperatures 5–300 K, most prominent features in photoluminescence spectra are an intense high-energy peak and a wide low-energy shoulder. The high-energy peak observed in the spectra is due to transitions between states in the valence and conduction bands, and the wide shoulder is associated with defects in quantum dots. The kinetics of band-edge photoluminescence is biexponential, which is interpreted as the simultaneous recombination of negative excitons and trions. It has been found that trion recombination makes a major contribution to the photoluminescence intensity. It has been shown that the recombination rate of both excitons and trions drops with increasing temperature. The slowdown of exciton recombination is attributed to the thermal occupation of higher lying optically inactive states and is well described in terms of the available theoretical models of the exciton state fine structure. The radiative lifetime of trions grows with temperature owing, first, to the occupation of optically passive states and, then, to delocalization of one electron from the quantum dot into the overbarrier continuum of states, which decreases the overlapping integral.

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ACKNOWLEDGMENTS

The authors thank T.A. Duda for preparations of samples and valuable discussion.

Funding

The investigation was supported by grant no. MK-31.481.2 of the President of the Russian Federation.

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Authors and Affiliations

  1. Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    K. A. Svit, A. A. Zarubanov & K. S. Zhuravlev

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  1. K. A. Svit
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  2. A. A. Zarubanov
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  3. K. S. Zhuravlev
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Correspondence to K. A. Svit.

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Translated by V. Isaakyan

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Svit, K.A., Zarubanov, A.A. & Zhuravlev, K.S. Recombination Kinetics of Excitons and Trions in Free-Standing CdS Quantum Dots Synthesized by the Langmuir–Blodgett Method. J. Exp. Theor. Phys. 135, 215–225 (2022). https://doi.org/10.1134/S1063776122080052

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