Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 10: Poster: Charge transfer effects in molecular materials (related to symposium SYCT)

CPP 10.5: Poster

Montag, 11. März 2013, 17:30–19:30, Poster C

Multifrequency electron spin resonance analysis of organic polymer:fullerene blends — •Max Gessner¹, Andreas Sperlich¹, Hannes Kraus¹, Stefan Väth¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Julius Maximilian University Würzburg, 97074 Würzburg, Germany — ²ZAE Bayern, 97074 Würzburg, Germany

Understanding of the light-induced charge transfer in organic solar cells is essential to improve material properties and processing parameters, and, at long sight, device performance. Since the charge carriers are spin-1/2 particles they can be studied by electron paramagnetic resonance (EPR). Several solar cell blends of fullerene-derivatives PC₆₀BM and PC₇₀BM with conjugated polymers P3HT, C-PCPDTBT and Si-PCPDTBT were investigated with light induced X-band EPR. The resulting spectra consist of overlapping signals from electrons and holes. By performing the same measurements with the high frequency Q-band EPR we were able to study the individual signals of charges localized on either fullerene or polymer domains in more details with higher resolution. By comparing the experimental spectra with simulations performed with EasySpin we have the tool for learning more about the local order and geometry as well as the electric properties of these promising materials for organic photovoltaics.