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Article Dans Une Revue ACS Nano Année : 2015

A Phonon Scattering Bottleneck for Carrier Cooling in Lead Chalcogenide Nanocrystals

Résumé

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.

Dates et versions

hal-02906824 , version 1 (25-07-2020)

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Citer

Pieter Geiregat, Christophe Delerue, Yolanda Justo, Michiel Aerts, Frank Spoor, et al.. A Phonon Scattering Bottleneck for Carrier Cooling in Lead Chalcogenide Nanocrystals. ACS Nano, 2015, 9 (1), pp.778-788. ⟨10.1021/nn5062723⟩. ⟨hal-02906824⟩
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