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Importance of Polaronic Effects for Charge Transport in CdSe Quantum Dot Solids.
J Phys Chem Lett ; 5(8): 1335-40, 2014 Apr 17.
Artigo em Inglês | MEDLINE | ID: mdl-26269977
ABSTRACT
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.

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: J Phys Chem Lett Ano de publicação: 2014 Tipo de documento: Artigo País de afiliação: Reino Unido