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The Dynamics of Multiple Exciton Generation in Semiconductor Quantum Dots

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Book cover Quantum Dot Solar Cells

Part of the book series: Lecture Notes in Nanoscale Science and Technology ((LNNST,volume 15))

Abstract

In this paper, the dynamics of multiple exciton generation (MEG) in colloidal PbS quantum dots (QDs) characterized using a transient grating (TG) technique are reported. Only one peak, soon after the absorption of light, can be observed in the TG kinetics when the photon energy of the pump light, hν, is smaller than 2.7E g (E g: the band gap between the LUMO and HOMO in the QDs). When hν is greater than 2.7E g, however, after the initial peak, the TG signal first decreases and then (after as little as 200 fs) increases, and a new peak appears at about 3 ps. The second peak intensity becomes larger with increasing hν. The first peak is considered to be related to hot carriers and the second one is believed to result from MEG. We found that MEG begins after just 200 fs and that the carrier density due to MEG increases and finally saturates after about 2 ps. Then, following the second peak, a fast decay, due to Auger recombination of the generated multiexcitons with a lifetime of about 30 ps, together with a slow decay, due to single exciton relaxation with a lifetime longer than nanoseconds, is observed in the TG kinetics. We succeeded in directly observing the occurrence and dynamics of MEG in semiconductor QDs using the TG technique.

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Acknowledgments

This research was supported by the PRESTO program, Japan Science and Technology Agency (JST) and by a Grant in Aid for Scientific Research (No. 21310073) from the Ministry of Education, Sports, Science and Technology of the Japanese Government.

Author information

Authors and Affiliations

  1. Faculty of Informatics and Engineering, Department of Engineering Science, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo, 182-8585, Japan

    Qing Shen & Taro Toyoda

  2. PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan

    Qing Shen

  3. CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan

    Qing Shen & Taro Toyoda

  4. Faculty of Science and Engineering, Department of Applied Chemistry, Chuo University, 1-13-27 Kasuga, Bunkyo, Tokyo, 112-8551, Japan

    Kenji Katayama

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  1. Qing Shen
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Correspondence to Qing Shen .

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Editors and Affiliations

  1. State Key Laboratory of Electronic Thin, University of Electronic Science and Technology of China, Chengdu, China, People's Republic

    Jiang Wu

  2. State Key Laboratory of Electronic, University of Electronic Science and Technology, Chengdu, China, People's Republic

    Zhiming M. Wang

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Shen, Q., Katayama, K., Toyoda, T. (2014). The Dynamics of Multiple Exciton Generation in Semiconductor Quantum Dots. In: Wu, J., Wang, Z. (eds) Quantum Dot Solar Cells. Lecture Notes in Nanoscale Science and Technology, vol 15. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8148-5_12

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  • DOI: https://doi.org/10.1007/978-1-4614-8148-5_12

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