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3 May 2012 Improving the photocurrent in low bandgap polymer: fullerene solar cells with molecular doping
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We demonstrate a simple and novel technique to improve the power conversion efficiency of polymer:fullerene solar cells based on the low bandgap polymer poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b']dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT) and the soluble fullerene derivative PCBM. We dope the blend via cosolution with the electron accepting molecule tetrafluoro-tetracyanoquinodimethane (F4-TCNQ). Doping concentrations of F4-CNQ from 0 - 0.3 %, with respect to the weight of the polymer, were investigated. The dark current-voltage (IV) characteristics, the illuminated IV characteristics, the external quantum efficiency, and the hole mobility in dependence of the doping concentration were studied. We observe an increase in the photocurrent resulting in improved solar cell efficiencies, which corresponds to an increase in the hole mobility in the polymer. We explain this enhancement in the solar cell performance in terms of decreased carrier recombination.
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Antonietta De Sio, Ali Veysel Tunc, Jürgen Parisi, Enrico Da Como, and Elizabeth von Hauff "Improving the photocurrent in low bandgap polymer: fullerene solar cells with molecular doping", Proc. SPIE 8435, Organic Photonics V, 84350E (3 May 2012);

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