Highly dispersed carbon nanotubes in organic media for polymer:fullerene photovoltaic devices

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Composites for a photo-active layer in an organic photovoltaic device are fabricated using homogeneously dispersed carbon nanotubes (CNTs) in a polymer:fullerene bulk-heterojunction matrix. CNTs are functionalized by alkyl-amide groups for high dispersion in organic media and by homogeneously mixing them with the polymer and fullerene in solution. In a Fourier transform infrared spectrometry analysis, the formation of functional groups is confirmed. Scanning electron microscopy images indicate the high dispersion of the CNTs. These composites show considerable improvement of their optical and electrical properties due to effects of the wideband photo-absorption and high charge carrier mobility of the CNTs. These effects were investigated by ultraviolet-visible spectroscopy and by the fabrication of an organic thin film transistor. An organic solar cell was fabricated from these composites as a photo-active layer, showing a remarkable 40% (3.2-4.4%) increase of the power conversion efficiency compared to an organic solar cell using a photo-active layer without CNTs. (C) 2011 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2012-01
Language
English
Article Type
Article
Keywords

SOLAR-CELLS; POLYMER; COMPOSITES; MORPHOLOGY; EFFICIENCY; NETWORK; FILMS

Citation

CARBON, v.50, no.1, pp.40 - 46

ISSN
0008-6223
DOI
10.1016/j.carbon.2011.07.052
URI
http://hdl.handle.net/10203/99700
Appears in Collection
MS-Journal Papers(저널논문)
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