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

Nikola Prodanovic*, Nenad Vukmirovic, Zoran Ikonic, Paul Harrison, Dragan Indjin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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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.

Original languageEnglish
Pages (from-to)1335-1340
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume5
Issue number8
DOIs
Publication statusPublished - 17 Apr 2014
Externally publishedYes

Keywords

  • BAND-LIKE TRANSPORT
  • NANOCRYSTAL SOLIDS
  • COLLOIDAL NANOCRYSTALS
  • PHONON INTERACTION
  • PHOTOVOLTAICS
  • FILM
  • ROUTE

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