Size- and temperature-dependent charge transport in PbSe nanocrystal thin films

Moon Sung Kang, Ayaskanta Sahu, David J. Norris, C. Daniel Frisbie

Research output: Contribution to journalArticle

Abstract

We report the size- and temperature-dependence of electron transport in thin films of PbSe nanocrystals. Upon increasing temperature over the range 28-200 K, the electron transport underwent a transition in mechanism from Efros-Shklovskii-variable-range-hopping (ES-VRH) to nearest-neighbor-hopping (NNH). The transition occurred at higher temperatures for films with smaller particles. The electron localization length, estimated from the ES-VRH model, was comparable to the nanocrystal size and scaled systematically with nanocrystal diameter. The activation energy from the NNH regime was also size-dependent, which is attributed both to size-dependent Coulomb effects and the size-distribution of nanocrystals.

Original languageEnglish (US)
Pages (from-to)3887-3892
Number of pages6
JournalNano Letters
Volume11
Issue number9
DOIs
StatePublished - Sep 14 2011

Keywords

  • Efros-Shklovskii-variable-range-hopping
  • PbSe nanocrystals
  • activation energy
  • localization length
  • nearest-neighbor-hopping
  • size-dependence

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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  • Cite this

    Kang, M. S., Sahu, A., Norris, D. J., & Frisbie, C. D. (2011). Size- and temperature-dependent charge transport in PbSe nanocrystal thin films. Nano Letters, 11(9), 3887-3892. https://doi.org/10.1021/nl2020153