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Cadirci M, Stubbs SK, Fairclough SM, et al. Ultrafast exciton dynamics in Type II ZnTe-ZnSe colloidal quantum dots. Phys Chem Chem Phys. 2012;14(39):13638-45doi: 10.1039/c2cp41978e.
Cadirci, M., Stubbs, S. K., Fairclough, S. M., Tyrrell, E. J., Watt, A. A., Smith, J. M., & Binks, D. J. (2012). Ultrafast exciton dynamics in Type II ZnTe-ZnSe colloidal quantum dots. Physical chemistry chemical physics : PCCP, 14(39), 13638-45. https://doi.org/10.1039/c2cp41978e
Cadirci, M, et al. "Ultrafast exciton dynamics in Type II ZnTe-ZnSe colloidal quantum dots." Physical chemistry chemical physics : PCCP vol. 14,39 (2012): 13638-45. doi: https://doi.org/10.1039/c2cp41978e
Cadirci M, Stubbs SK, Fairclough SM, Tyrrell EJ, Watt AA, Smith JM, Binks DJ. Ultrafast exciton dynamics in Type II ZnTe-ZnSe colloidal quantum dots. Phys Chem Chem Phys. 2012 Oct 21;14(39):13638-45. doi: 10.1039/c2cp41978e. PMID: 22964845.
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Phys Chem Chem Phys. 2012 Oct 21;14(39):13638-45. doi: 10.1039/c2cp41978e.

Ultrafast exciton dynamics in Type II ZnTe-ZnSe colloidal quantum dots.

Physical chemistry chemical physics : PCCP

M Cadirci, S K Stubbs, S M Fairclough, E J Tyrrell, A A R Watt, J M Smith, D J Binks

Affiliations

  1. School of Physics and Astronomy & Photon Science Institute, University of Manchester, Manchester, UK.

PMID: 22964845 DOI: 10.1039/c2cp41978e

Abstract

Ultrafast transient absorption spectroscopy is used to investigate the exciton dynamics of Type II ZnTe-ZnSe core-shell colloidal quantum dots. Surface-trapping is shown to occur within a few picosecond for hot electrons and with a few 10s of picoseconds for electrons cooled to the band-edge, and is the dominant process in the decay of the band-edge bleach for well-stirred samples pumped at moderate powers. The surface-trapped electrons produce a broad photo-induced absorption that spectrally overlaps with the band-edge, distorting and partially cancelling out the bleach feature. At high pump powers and for unstirred samples, these surface-trapped electrons can survive sufficiently long within the pumped volume to accumulate under repeated excitation of the sample, resulting in the formation of an additional exciton decay channel.

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