Nano Archive

Structural, optical and electrical properties of self-assembled films of PbSe nanocrystals treated with 1,2-ethanedithiol

Luther, Joseph M. and Law, Matt and Song, Qing and Perkins, Craig L. and Beard, Matthew C. and Nozik, Arthur J. (2008) Structural, optical and electrical properties of self-assembled films of PbSe nanocrystals treated with 1,2-ethanedithiol. ACS NANO, 2 (2). pp. 271-280.

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Official URL: http://dx.doi.org/10.1021/nn7003348

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.

Item Type:Article
Uncontrolled Keywords:nanocrystals; PbSe; multiple exciton generation; films; 1,2-ethanedithiol; field-effect transistor; oxidation
Subjects:Material Science > Nanofabrication processes and tools
Technology > Nanotechnology and energy applications
Material Science > Nanochemistry
Material Science > Nanostructured materials
ID Code:2633
Deposited By:Anuj Seth
Deposited On:09 Jan 2009 13:59
Last Modified:20 Jan 2009 11:24

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