Berlin 2008 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 36: Poster III

HL 36.12: Poster

Wednesday, February 27, 2008, 16:30–19:00, Poster D

Investigations of concentration dependent photoluminescense quenching in a P3HT : PCBM bulk heterojunction — •Johannes Krantz¹, Moritz Liedtke^1,2, Andreas Sperlich¹, Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Julius-Maximilians-University of Würzburg, Am Hubland, D–97074 Würzburg — ²The Bavarian Center for Applied Energy Research (ZAE Bayern), Am Hubland, D–97074 Würzburg

The photoluminescence (PL) quenching effect is a strong indicator for charge or energy transfer in photovoltaic polymer - fullerene bulk heterojunctions solar cells. In order to achieve a high photocurrent, an efficient generation of charge carriers is a necessary prerequiste. We present our investigations on the PL-quenching efficiency in P3HT (poly(3-hexylthiophene)) and PCBM ([6,6]-phenyl-C61-butyric acid methyl ester) blends with respect to the donor - acceptor ratio. In order to verify that charge transfer is the dominant process, we conducted electron spin resonance measurements. For a more detailed understanding of the underlying mechanisms of PL quenching, we discuss our data in view of a model by Arkhipov et al.¹ as well as a volume-based model.