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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Organic Semiconductors

CPP 8.4: Poster

Montag, 14. März 2011, 17:30–19:30, P2

Multifrequency LESR of P3HT:C70 blends — •Johannes Römer¹, Andreas Sperlich¹, Hannes Kraus¹, Oleg Poluektov², Carsten Deibel¹, and Vladimir Dyakonov^1,3 — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, D-97074 Würzburg — ²Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA — ³ZAE Bayern, D-97074 Würzburg

For application in polymer bulk heterojunction solar cells, the blend of the polythiophene P3HT and the PC₇₀BM fullerene electron acceptor material is a promising model system, as C₇₀-derivatives are used in the most efficient organic solar cells.

Using high-frequency electron spin resonance (ESR), we were able to separate the signals of the positive polaron from the negative anion localized on the C₇₀-cage, and the involved g-tensor components could be obtained. The focus of this work is the analysis of the main parameters of light induced ESR spectra obtained at different microwave frequencies, namely 9, 36, and 130 GHz.