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

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

Conference Paper (2015)

Author(s)

Pieter Geiregat (Universiteit Gent)

Christophe Delerue (IEMN Institut d'Electronique de Microelectronique et de Nanotechnologie)

Yolanda Justo (Universiteit Gent)

Michiel Aerts (TU Delft - ChemE/Opto-electronic Materials)

Frank Spoor (TU Delft - ChemE/Opto-electronic Materials)

Dries Van Thourhout (Universiteit Gent)

Laurens 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)

Zeger Hens

DOI related publication

https://doi.org/10.1557/opl.2015.595 Final published version

To reference this document use

https://resolver.tudelft.nl/uuid:0fbef8e8-e4cd-4942-9172-594ecba33ec1

More Info

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Publication Year

2015

Language

English

Volume number

1787

Pages (from-to)

1-5

ISBN (electronic)

9781510826410

Event

Downloads counter

190

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.