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A Phonon Scattering Bottleneck for Carrier Cooling in Lead-Chalcogenide Nanocrystals

Published online by Cambridge University Press:  11 June 2015

Pieter Geiregat ,
Christophe Delerue ,
Yolanda Justo ,
Michiel Aerts ,
Frank Spoor ,
Dries van Thourhout ,
Laurens Siebbeles ,
Guy Allan ,
Arjan Houtepen  and
Zeger Hens
Pieter Geiregat
Affiliation:
Physics and Chemistry of Nanostructures Group, Department of Inorganic and Physical Chemistry, University of Ghent, Ghent, Belgium Photonics Research Group, Department of Information Technology, University of Ghent, Ghent, Belgium Center for Nano-and Biophotonics, University of Ghent, Ghent, Belgium
Christophe Delerue
Affiliation:
IEMN, Département ISEN, UMR CNRS, Lille, France
Yolanda Justo
Affiliation:
Physics and Chemistry of Nanostructures Group, Department of Inorganic and Physical Chemistry, University of Ghent, Ghent, Belgium Center for Nano-and Biophotonics, University of Ghent, Ghent, Belgium
Michiel Aerts
Affiliation:
Opto-Electronic Materials Section, Department of Chemistry, Technical University of Delft, Delft, The Netherlands
Frank Spoor
Affiliation:
Opto-Electronic Materials Section, Department of Chemistry, Technical University of Delft, Delft, The Netherlands
Dries van Thourhout
Affiliation:
Photonics Research Group, Department of Information Technology, University of Ghent, Ghent, Belgium Center for Nano-and Biophotonics, University of Ghent, Ghent, Belgium
Laurens Siebbeles
Affiliation:
Opto-Electronic Materials Section, Department of Chemistry, Technical University of Delft, Delft, The Netherlands
Guy Allan
Affiliation:
IEMN, Département ISEN, UMR CNRS, Lille, France
Arjan Houtepen
Affiliation:
Physics and Chemistry of Nanostructures Group, Department of Inorganic and Physical Chemistry, University of Ghent, Ghent, Belgium Center for Nano-and Biophotonics, University of Ghent, Ghent, Belgium Opto-Electronic Materials Section, Department of Chemistry, Technical University of Delft, Delft, The Netherlands
Zeger Hens
Affiliation:
Physics and Chemistry of Nanostructures Group, Department of Inorganic and Physical Chemistry, University of Ghent, Ghent, Belgium Center for Nano-and Biophotonics, University of Ghent, Ghent, Belgium Opto-Electronic Materials Section, Department of Chemistry, Technical University of Delft, Delft, The Netherlands
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Abstract

The cooling dynamics of hot charge carriers in colloidal lead chalcogenide nanocrystals is studied by white light transient absorption spectroscopy. We demonstrate a transient accumulation of charge carriers at a high-energy critical point in the Brillouin zone. Using a theoretical study of the cooling rate in lead chalcogenides, we attribute this slowing down of charge carrier cooling to a phonon scattering bottleneck around this critical point. Our approach allows for the first ever determination of hot carrier cooling rates, relevant in e.g. modeling of multiple exciton generation.

Keywords

opticalII-VInanostructure

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References

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