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

Fingerprint

Nanocrystals
Charge transfer
nanocrystals
Thin films
thin films
Temperature
electrons
temperature
Activation energy
activation energy
temperature dependence
lead selenide
Electrons
Electron Transport

Keywords

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

ASJC Scopus subject areas

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

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

Size- and temperature-dependent charge transport in PbSe nanocrystal thin films. / Kang, Moon Sung; Sahu, Ayaskanta; Norris, David J.; Frisbie, C. Daniel.

In: Nano Letters, Vol. 11, No. 9, 14.09.2011, p. 3887-3892.

Research output: Contribution to journalArticle

Kang, MS, Sahu, A, Norris, DJ & Frisbie, CD 2011, 'Size- and temperature-dependent charge transport in PbSe nanocrystal thin films', Nano Letters, vol. 11, no. 9, pp. 3887-3892. https://doi.org/10.1021/nl2020153
Kang, Moon Sung ; Sahu, Ayaskanta ; Norris, David J. ; Frisbie, C. Daniel. / Size- and temperature-dependent charge transport in PbSe nanocrystal thin films. In: Nano Letters. 2011 ; Vol. 11, No. 9. pp. 3887-3892.
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