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

Pieter Geiregat, Christophe Delerue, Yolanda Justo, Michiel Aerts, Frank Spoor, Dries Van Thourhout, Laurens Siebbeles, Guy Allan, A.J. Houtepen, Zeger Hens

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

1 Citation (Scopus)

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.

Original languageEnglish
Title of host publicationThe Interplay of Structure and Carrier Dynamics in Energy-Relevant Nanomaterials
PublisherEuropean Materials research Society
Pages1-5
Number of pages5
Volume1787
ISBN (Electronic)9781510826410
DOIs
Publication statusPublished - 2015
Event2015 MRS Spring Meeting - San Francisco, United States
Duration: 6 Apr 201510 Apr 2015

Conference

Conference2015 MRS Spring Meeting
CountryUnited States
CitySan Francisco
Period6/04/1510/04/15

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    Geiregat, P., Delerue, C., Justo, Y., Aerts, M., Spoor, F., Van Thourhout, D., Siebbeles, L., Allan, G., Houtepen, A. J., & Hens, Z. (2015). A phonon scattering bottleneck for carrier cooling in lead-chalcogenide nanocrystals. In The Interplay of Structure and Carrier Dynamics in Energy-Relevant Nanomaterials (Vol. 1787, pp. 1-5). European Materials research Society. https://doi.org/10.1557/opl.2015.595