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Title: Influence of polymer ionization potential on the open-circuit voltage of hybrid polymer/TiO2 solar cells
Authors: Ishwara, T
Bradley, DDC
Nelson, J
Ravirajan, P
Vanseveren, I
CLEIJ, Thomas
LUTSEN, Laurence
Tierney, S
Heeney, M.
McCulloch, Iain
Issue Date: 2008
Abstract: We report studies of the dependence of the open-circuit voltage (V-OC) of polymer/titanium dioxide hybrid devices on the ionization potential of the polymer (I-P). Once corrected for differences in photocarrier generation by the polymers, the measured V-OC values vary linearly with the polymer I-P, with a slope of 0.8 +/- 0.1. This behavior agrees with recent studies of polymer/fullerene photovoltaic devices and is consistent with the hypothesis that V-OC of an organic donor-acceptor solar cell is limited by the energy difference between the highest occupied molecular orbital of the donor (in this case, the polymer) and the lowest unoccupied electronic level of the acceptor (in this case, the conduction band edge of the TiO2). (c) 2008 American Institute of Physics.
Notes: Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2BW, England. Univ Jaffna, Dept Phys, Jaffna 40000, Sri Lanka. Univ Hasselt, B-3590 Diepenbeek, Belgium. IMOMEC, IMEC, B-3590 Diepenbeek, Belgium. Merck Chem, Southampton S016 7QD, Hants, England.Ishwara, T, Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2BW, England.jenny.nelson@imperial.ac.uk
URI: http://hdl.handle.net/1942/8003
DOI: 10.1063/1.2840608
ISI #: 000253016500084
ISSN: 0003-6951
Category: A1
Type: Journal Contribution
Validation: ecoom, 2009
Appears in Collections: Research publications

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