Regensburg 2010 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 62: Poster II: Photovoltaics and Organic Semiconductors

HL 62.11: Poster

Thursday, March 25, 2010, 18:00–20:00, Poster D2

Decay of excited species in P3HT:PCBM blends studied by transient absorption — •Matthias Gunz¹, Julien Gorenflot¹, Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Physical Institute, Julius-Maximilians-University of Würzburg, D-97074 Würzburg — ²Bavarian Centre for Applied Energy Research (ZAE Bayern), D-97074 Würzburg

One important parameter for improving the efficiency of organic solar cells is to understand the involved processes of charge generation and recombination, as well as their time dependence. Transient absorption spectroscopy enables us to observe the dynamics of photoexcited species. The investigations are carried out on blends of P3HT:PCBM on a timescale from nanoseconds to milliseconds. Pump intensity and temperature dependencies are studied, as well as the influence of different acceptor materials. The experimental results are compared to the charge carrier continuity equation, accounting for monomolecular and bimolecular recombination.