Size-dependent electrical transport in CdSe nanocrystal thin films

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

Research output: Contribution to journalArticle

Abstract

Electrical transport in films of CdSe nanocrystals with diameters varying from 2.9 to 5.1 nm was examined over 233-300 K by employing electrolyte gating to control the electron density. The transport parameters varied strongly and systematically with nanocrystal diameter. First, a strong correlation was observed between the device turn-on voltage and the size-dependent position of the lowest unoccupied electronic states of the nanocrystals. Second, the electron mobility increased with increasing particle diameter and reached a high value of 0.6 cm2/(V s) for films with 5.1 nm nanocrystals. Third, the charge transport could be described in terms of the nearest-neighbor-hopping mechanism with a size-dependent activation energy and a pre-exponential factor for mobility. The activation energy can be viewed as a size-dependent charging energy of an individual nanocrystal. Collectively, the combination of size- and temperature-dependent measurements provides a powerful approach to understanding electrical transport in nanocrystal films.

Original languageEnglish (US)
Pages (from-to)3727-3732
Number of pages6
JournalNano Letters
Volume10
Issue number9
DOIs
StatePublished - Sep 8 2010

Fingerprint

Nanocrystals
nanocrystals
Thin films
thin films
Activation energy
activation energy
Electron mobility
Electronic states
electron mobility
Electrolytes
Carrier concentration
charging
Charge transfer
electrolytes
Electric potential
electric potential
electronics
Temperature
temperature
energy

Keywords

  • CdSe nanocrystals
  • electrical transport
  • ion-gel gate dielectric
  • size dependence
  • thin-film transistors

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. (2010). Size-dependent electrical transport in CdSe nanocrystal thin films. Nano Letters, 10(9), 3727-3732. https://doi.org/10.1021/nl102356x

Size-dependent electrical transport in CdSe nanocrystal thin films. / Kang, Moon Sung; Sahu, Ayaskanta; Norris, David J.; Frisbie, C. Daniel.

In: Nano Letters, Vol. 10, No. 9, 08.09.2010, p. 3727-3732.

Research output: Contribution to journalArticle

Kang, MS, Sahu, A, Norris, DJ & Frisbie, CD 2010, 'Size-dependent electrical transport in CdSe nanocrystal thin films', Nano Letters, vol. 10, no. 9, pp. 3727-3732. https://doi.org/10.1021/nl102356x
Kang, Moon Sung ; Sahu, Ayaskanta ; Norris, David J. ; Frisbie, C. Daniel. / Size-dependent electrical transport in CdSe nanocrystal thin films. In: Nano Letters. 2010 ; Vol. 10, No. 9. pp. 3727-3732.
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