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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster: Organic Semiconductors
CPP 8.4: Poster
Monday, March 14, 2011, 17:30–19:30, P2
Multifrequency LESR of P3HT:C70 blends — •Johannes Römer1, Andreas Sperlich1, Hannes Kraus1, Oleg Poluektov2, Carsten Deibel1, and Vladimir Dyakonov1,3 — 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.