A phonon scattering bottleneck for carrier cooling in lead-chalcogenide nanocrystals
Pieter Geiregat (Universiteit Gent)
Christophe Delerue (IEMN Institut d'Electronique de Microelectronique et de Nanotechnologie)
Yolanda Justo (Universiteit Gent)
M. Aerts (TU Delft - ChemE/Opto-electronic Materials)
Frank Spoor (TU Delft - ChemE/Opto-electronic Materials)
Dries Van Thourhout (Universiteit Gent)
LDA Siebbeles (TU Delft - ChemE/Opto-electronic Materials)
Guy Allan (IEMN Institut d'Electronique de Microelectronique et de Nanotechnologie)
A.J. Houtepen (TU Delft - ChemE/Opto-electronic Materials)
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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.
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