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Structural, Optical, and Electrical Properties of Self-Assembled Films of PbSe Nanocrystals Treated with 1,2-Ethanedithiol
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.
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Metadata
- Authors
- Luther, J. M., Law, M., Song, Q., Perkins, C. L., Beard, M. C., & Nozik, A. J.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2008-01-31
- Volume
- 2
- Issue
- 2
- Pages
- 271-280
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2141457340
- Cited by
- 754
- References
- 0
- FWCI
- 23.58
- Type
- journal article
- Language
- en
- Open access
- closed
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