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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices
SYOP 4: Organic Photovoltaics: from Single Molecules to Devices
SYOP 4.35: Poster
Thursday, March 26, 2009, 16:30–19:00, P1A
Investigation of charge carrier transport and recombination in polymer:fullerene solar cells using transient current injection and extraction techniques — •Cristina Urs1, Andreas Baumann1, Carsten Deibel1, and Vladimir Dyakonov1,2 — 1Julius-Maximilians-University of Würzburg, Institute of Physics, Experimental Physics VI, D-97074 Würzburg — 2Bavarian Centre for Applied Energy Research e.V. (ZAE Bayern), D-97074 Würzburg
The charge carrier transport and recombination processes are important factors for the efficiency of organic bulk heterojunction solar cells. We study these mechanisms in poly(3-hexylthiophene) (P3HT): [6,6]-phenyl-C61 butyric acid methyl ester (PCBM) photovoltaic devices, using the experimental techniques double injection current and plasma extraction. Both, the charge carrier mobility as well as the recombination rate can be determined simultaneously. We find that the major loss mechanism is due to nongeminate charge recombination, with at least second order decay rates. Our findings will be discussed in view of recent publications concerning bimolecular and trimolecular recombination.