Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 45: Joint Poster Session

HL 45.15: Poster

Tuesday, March 15, 2011, 18:00–21:00, P1

Spectrally Resolved Transient Absorption in Polymer:Fullerene Blend Films — •Andreas Kämpgen¹, Julien Gorenflot¹, Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Julius-Maximilians-University Würzburg, 97074 Würzburg, Germany — ²Bavarian Centre for Applied Energy Research (ZAE Bayern), 97074 Würzburg, Germany

Bimolecular charge carrier recombination is an efficiency limiting mechanism in organic solar cells. As this fundamental loss process is strongly related to the nanomorphology in blend films of electron donating and electron accepting materials, the study of this mechanism allows to draw conclusions about the impact of spatial (dis)order and phase separation on cell performance. The bimolecular recombination dynamics were investigated by nanosecond transient absorption spectroscopy. Measurements were carried out on blend films of polymers and fullerene derivatives in the temperature range from 30K to 300K. In order to distinguish between different excited species, different probe beam wavelengths were used. The decays were monitored on nanosecond to microsecond timescale and interpreted in terms of morphological as well as energetic trapping of charges.