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

PRODANOVIC, Nikola, VUKMIROVIC, Nenad, INDJIN, Dragan, IKONIC, Zoran and HARRISON, Paul (2014). Importance of Polaronic Effects for Charge Transport in CdSe Quantum Dot Solids. The Journal of Physical Chemistry Letters.

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Link to published version:: 10.1021/jz500086c


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.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group
Identification Number: 10.1021/jz500086c
Depositing User: Paul Harrison
Date Deposited: 07 Mar 2014 11:29
Last Modified: 20 Oct 2016 00:20

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