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Authors: P. Geiregat, C. Delerue, Y. Justo, M. Aerts, F. Spoor, D. Van Thourhout, L. Siebbeles, G. Allan, A.J. Houtepen, Z. Hens
Title: A phonon scattering bottleneck for carrier cooling in lead chalcogenide nanocrystals
Format: International Journal
Publication date: 1/2015
Journal/Conference/Book: ACS Nano
Volume(Issue): 9(1) p.778–788
Internal Reference: [N-1696]
DOI:
Download: Download this Publication (3.1MB) (3.1MB)

Abstract

The cooling dynamics of hot charge carriers in colloidal lead chalcogenide nanocrystals is studied by hyperspectral 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. The relevance of this observation for the possible harvesting of the
excess energy of hot carriers by schemes such as multiexciton generation is discussed.

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