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HL: Fachverband Halbleiterphysik

HL 45: Joint Poster Session

HL 45.20: Poster

Dienstag, 15. März 2011, 18:00–21:00, P1

Solution processed bulk heterojunction solar cells with molecularly doped active layers — •Antonietta De Sio¹, Ali Veysel Tunc¹, Elizabeth von Hauff¹, Felix Deschler², Enrico Da Como², and Jürgen Parisi¹ — ¹Energy and Semiconductor Research Laboratory, Institute of Physics, Carl von Ossietzky Universität Oldenburg, 26111 Oldenburg, Germany — ²Photonics and Optoelectronics Group, Department of Physics and CeNS, Ludwig-Maximilians-Universität München, 80799, Munich, Germany

We report on the improvement of the device performance of polymer:fullerene bulk heterojunction solar cells by molecularly doping the active layer. 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) was used to p-dope the low bandgap polymer poly[2,6(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b:3,4-b0]-dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT) that was then blended with the soluble fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). Blends with different doping concentrations were investigated. We show how the short circuit current densities of the photovoltaic devices increase with the doping concentration as a result of an enhancement of the field effect mobilities.