Importance of Polaronic Effects for Charge Transport in CdSe Quantum Dot Solids

We developed an accurate model accounting for electron–phonon interaction in colloidal quantum dot supercrystals that allowed us to identify the nature of charge carriers and the electrical transport regime. We find that in experimentally analyzed CdSe nanocrystal solids, the electron–phonon interac...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2014-04, Vol.5 (8), p.1335-1340
Main Authors: Prodanović, Nikola, Vukmirović, Nenad, Ikonić, Zoran, Harrison, Paul, Indjin, Dragan
Format: Article
Language:English
Subjects:
Physical Processes in Nanomaterials and Nanostructures
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Summary:We developed an accurate model accounting for electron–phonon interaction in colloidal quantum dot supercrystals that allowed us to identify the nature of charge carriers and the electrical transport regime. We find that in experimentally analyzed CdSe nanocrystal solids, the electron–phonon interaction is sufficiently strong that small polarons localized to single dots are formed. Charge-carrier transport occurs by small polaron hopping between the dots, with mobility that decreases with increasing temperature. While such a temperature dependence of mobility is usually considered as a proof of band transport, we show that the same type of dependence occurs in the system where transport is dominated by small polaron hopping.
ISSN:1948-7185
1948-7185
DOI:10.1021/jz500086c