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Polymer solar cells with low-bandgap polymers blended with C70-derivative give photocurrent at 1 μm
Article in journal
Xiangjun Wang, Erik Perzon, Wendimagegn Mammo, Frédéric Oswald, Shimelis Admassie, Nils-Krister Persson, Fernando Langa, Mats R. Andersson, Olle Inganäs
Publication Year
Thin Solid Films, 2006, (511-512), 576-580
Link to Source (DOI)
<p>A new series of low-bandgap alternating polyfluorenes with different donor–acceptor–donor moieties have been synthesized. Electrochemical and optical absorption measurement show that onset bandgaps of these polymers range from 1.2 to 1.5 eV. These polymers, blended with a C<sub>70</sub>-derivative as acceptor, are used for solar cell fabrication. Devices show promising photovoltaic properties, and the spectral response of photocurrent covers all visible and near-infrared wavelength regions with its onset extended to 1 μm. The best data gives a photocurrent density of 3.4 mA/cm<sup>2</sup>, open circuit voltage of 0.58 V and power conversion efficiency of 0.7% under illumination of AM1.5 (1000 W/m<sup>2</sup>) from a solar simulator.</p>