Regensburg 2010 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 62: Poster II: Photovoltaics and Organic Semiconductors

HL 62.19: Poster

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

Recombination in P3HT based solar cells with different acceptor materials — •Sebastian Hafner¹, Andreas Baumann¹, Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Julius-Maximilians-University of Würzburg, D-97074 Würzburg, Germany — ²Functional Materials for Energy Technology, Bavarian Centre for Applied Energy Research (ZAE Bayern), D-97074 Würzburg

In order to improve the performance of organic solar cells, it is indispensable to understand the recombination mechanisms in those devices. In previous investigations, a reduced Langevin polaron recombination could be observed [1]. We apply the experimental technique of Photo-CELIV (Charge Carrier Extraction by Linearly Increasing Voltage) to study the recombination dynamics in organic bulk heterojuction solar cells. With this technique, the charge carrier concentration and the mobility of the carriers can be determined simultaneously.The recombination processes in the material system of P3HT with different fullerene acceptors (PC[61]BM, bis-PC[61]BM, PC[71]BM) was investigated in dependence on the temperature and laser intensity. We relate our experimental findings concerning recombination to the performance of polymer:fullerene solar cells.

[1] C. Deibel, A. Baumann, V. Dyakonov: Polaron recombination in pristine and annealed bulk heterojunction solar cells, Applied Physics Letter 93, 163303 (2008)