Regensburg 2007 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 28: Polymer Physics V

CPP 28.1: Talk

Thursday, March 29, 2007, 17:15–17:30, H40

Lifetimes of photoexcited states in P3HT:PCBM heterojunctions — •Johannes Sieger¹, Andreas Wörle¹, Andreas Sperlich¹, Moritz Liedtke^1,2, Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Physical Institute, Julius-Maximilians University of Würzburg, Am Hubland. D-97074 Würzburg — ²Div. Functional Materials for Energy Technology, ZAE Bayern e.V., Am Hubland, D-97074 Würzburg

The photoinduced charge transfer and the resulting charge carrier generation in polymer-fullerene bulk heterojunctions are essential for organic photovoltaics. We present our investigations on the efficiency of singlet exciton dissociation and polaron generation in poly(3-hexylthiophene) (P3HT) : [6,6] phenyl-C61-butyric acid methyl ester (PCBM) blends by performing photoluminescence measurements, photoinduced absorption spectroscopy (PIA) and light-induced electron spin resonance (LESR). Particularly, we focus on the temperature dependence of the lifetime of the photoinduced states. The PIA measurements were possible at room temperature due to a high sensitivity of the setup and are relevant for applications of organic semiconductors such as solar cells.