Regensburg 2007 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 22: POSTER: INTERNAL SYMPOSIUM Optical Spectrosopy

CPP 22.12: Poster

Wednesday, March 28, 2007, 16:00–18:30, Poster B

Characterization of novel acceptor materials for photovoltaic application by optical spectroscopy methods — •Moritz Liedtke^1,2, Andreas Wörle¹, Johannes Sieger¹, Carsten Deibel¹, Vladimir Dyakonov^1,2, Ingo Riedel², and Nazario Martin³ — ¹Experimental Physics VI, Physical Institute, Julius-Maximilians University of Würzburg, Am Hubland, D-97074 Würzburg, Germany — ²Div. Functional Materials for Energy Technology, ZAE Bayern e.V., Am Hubland, D-97074 Würzburg, Germany — ³Departamento de Quimica Organica, Facultad de Quimica, Universidad Complutense, E-28040 Madrid, Spain

Polymer-Fullerene composites are used in photovoltaic applications due to their efficient charge carrier generation. One approach to improve power efficiencies of bulk heterojunction solar cells are new material combinations in which the low absorbing C60 derivative (PCBM) is replaced by an optically active C70 based methanofullerne. We compared blends of poly(3-hexylthiophene) (P3HT) and [6,6] phenyl-C61-butyric acid methyl ester to blends of two C70 based fullerene molecules mixed with P3HT. We studied the formation of excited states, their lifetimes and charge transfer reactions with respect to blend ratio and temperature by optical spectroscopy techniques such as photoinduced absorption (PIA) and frequency dependent PIA measurements.