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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

Donnerstag, 26. März 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 Dyakonov^1,2 — 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.