Structural, Optical and Electrical Properties of Self-Assembled Films of PbSe Nanocrystals Treated with 1,2-Ethanedithiol

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Abstract

We describe the structural, optical, and electrical properties of high-quality films of PbSe nanocrystals fabricated by a layer-by-layer (LbL) dip-coating method that utilizes 1,2-ethanedithiol (EDT) as an insolubilizing agent. Comparative characterization of nanocrystal films made by spin-coating and by the LbL process shows that EDT quantitatively displaces oleic acid on the PbSe surface, causing a large volume loss that electronically couples the nanocrystals while severely degrading their positional and crystallographic order of the films. Field-effect transistors based on EDT-treated films are moderately conductive and ambipolar in the dark, becoming p-type and 30-60 times more conductive under 300 mW cm-2 broadband illumination. The nanocrystal films oxidize rapidly in air to yield, after short air exposures, highly conductive p-type solids. The LbL process described here is a general strategy for producing uniform, conductive nanocrystal films for applications in optoelectronics and solar energy conversion.

Original languageAmerican English
Pages (from-to)271-280
Number of pages10
JournalACS Nano
Volume2
Issue number2
DOIs
StatePublished - Feb 2008

NREL Publication Number

  • NREL/JA-2A0-42661

Keywords

  • 1,2-ethanedithiol
  • Field-effect transistor
  • Films
  • Multiple exciton generation
  • Nanocrystals
  • Oxidation
  • PbSe

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