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O: Fachverband Oberflächenphysik

O 18: [HL] Organic Semiconductors: Solar Cells (Joint Session DS/CPP/HL/O)

O 18.4: Vortrag

Montag, 22. März 2010, 16:45–17:00, H15

Polaron Recombination Dynamics in Bulk Heterojunction Solar Cells — •Andreas Baumann¹, Alexander Wagenpfahl¹, Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Physical Institute, Julius-Maximilians-University of Würzburg, Am Hubland, D-97074 Würzburg — ²Centre of Applied Energy Research (ZAE Bayern e. V.), Am Hubland, D-97074 Würzburg

Organic solar cells with more than 6% power conversion efficiency were recently shown, coming closer to commercialization. For further improvements, a better understanding of the loss mechanisms inside the solar cell are needed, such as the recombination of photo-generated charge carriers. We applied the experimental technique of charge extraction by linearly increasing voltage (Photo-CELIV) to investigate the recombination dynamics in poly(3-hexylthiophene) (P3HT) : [6,6]-phenyl-C₆₁ butyric acid methyl ester (PCBM) bulk heterojunction solar cells. It was found experimentally, that the dominating polaron loss mechanism in P3HT:PCBM solar cells is of Langevin type, but reduced by a factor in the range of 0.1 in pristine samples to 0.01 in annealed ones [1]. We propose a model taking the charge carriers profile inside the active layer into account, which describes the origin of the observed reduced Langevin recombination [2].

[1] C. Deibel, A. Baumann, V. Dyakonov, APL 93, 252104 (2008)

[2] C. Deibel, A. Wagenpfahl, V. Dyakonov, PRB 80, 075203 (2009)

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