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Ultrafast dynamics of carrier-induced absorption changes in highly-excited CdSe nanocrystals

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Abstract

We use femtosecond time-resolved transmission spectroscopy to study the density and time dependence of transient absorption changes of CdSe nanocrystals. Our data show pronounced absorption saturation up to complete bleaching of the lowest optical transition. At high carrier density the nonlinear spectra show several peaks that can be related to the two lowest quantized electron states. Thetime dependence of the carrier-induced absorption changes indicates an ultrafast relaxation process within the strongly broadened absorption lines.

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  1. S. Hunsche

    Present address: FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ, Amsterdam, The Netherlands

Authors and Affiliations

  1. Institut für Halbleitertechnik II, Rheinisch-Westfälische Technische Hochschule Aachen, D-52056, Aachen, Germany

    S. Hunsche, T. Dekorsy, V. Klimov & H. Kurz

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Hunsche, S., Dekorsy, T., Klimov, V. et al. Ultrafast dynamics of carrier-induced absorption changes in highly-excited CdSe nanocrystals. Appl. Phys. B 62, 3–10 (1996). https://doi.org/10.1007/BF01081240

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