A phonon scattering bottleneck for carrier cooling in lead-chalcogenide nanocrystals

Conference paper (2015)

Authors

Pieter Geiregat Universiteit Gent
Christophe Delerue IEMN Institut d'Electronique de Microelectronique et de Nanotechnologie
Yolanda Justo Universiteit Gent
M. Aerts ChemE/Opto-electronic Materials
Frank C.M. Spoor ChemE/Opto-electronic Materials
Dries Van Thourhout Universiteit Gent
Laurens D.A. Siebbeles ChemE/Opto-electronic Materials
Guy Allan IEMN Institut d'Electronique de Microelectronique et de Nanotechnologie
Arjan Houtepen ChemE/Opto-electronic Materials
Research Group
ChemE/Opto-electronic Materials
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Published Date

2015

Language

English

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Research Group

ChemE/Opto-electronic Materials

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.

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