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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/4162

Title: Formation of a ground-state charge-transfer complex in polyfluorene/[6,6]-phenyl-C-61 butyric acid methyl ester (PCBM) blend films and its role in the function of polymer/PCBM solar cells
Authors: Benson-Smith, Jessica J.
GORIS, Ludwig
VANDEWAL, Koen
HAENEN, Ken
MANCA, Jean
VANDERZANDE, Dirk
Bradley, Donal D. C.
Nelson, Jenny
Issue Date: 2007
Publisher: WILEY-V C H VERLAG GMBH
Citation: ADVANCED FUNCTIONAL MATERIALS, 17(3). p. 451-457
Abstract: Evidence is presented for the formation of a weak ground-state charge-transfer complex in the blend films of poly [9,9-dioctylfluorene-co-N-(4-methoxyphenyl)diphenylamine] polymer (TFMO) and [6,6]-phenyl-C-61, butyric acid methyl ester (PCBM), using photothermal deflection spectroscopy (PDS) and photoluminescence (PL) spectroscopy. Comparison of this polymer blend with other polyfluorene polymer/PCBM blends shows that the appearance of this ground-state charge-transfer complex is correlated to the ionization potential of the polymer, but not to the optical gap of the polymer or the surface morphology of the blend film. Moreover, the polymer/PCBM blend films in which this charge-transfer complex is observed also exhibit efficient photocurrent generation in photovoltaic devices, suggesting that the charge-transfer complex may be involved in charge separation. Possible mechanisms for this charge-transfer state formation are discussed as well as the significance of this finding to the understanding and optimization of polymer blend solar cells.
Notes: Univ London Imperial Coll Sci & Technol, Dept Phys, London SW7 2BW, England. Limburgs Univ Ctr, Inst Mat Res, B-3590 Diepenbeek, Belgium.Benson-Smith, JJ, Univ London Imperial Coll Sci & Technol, Dept Phys, London SW7 2BW, England.jenny.nelson@imperial.ac.uk
URI: http://hdl.handle.net/1942/4162
Link to publication: hhtp://doi.wiley.com/10.1002/adfm.200600484
ISI #: 000244500600014
ISSN: 1616-301X
Category: A1
Type: Journal Contribution
Validation: ecoom, 2008
Appears in Collections: Research publications

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