Dresden 2011 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Organic Semiconductors

CPP 8.2: Poster

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

Temperature dependant investigation of charge-transfer states in P3HT:PC60BM studied by time resolved ESR — •Magdalena Zawadzki¹, Andreas Sperlich¹, Hannes Kraus¹, Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Julius-Maximilians-University of Würzburg, D-97074 Würzburg — ²ZAE Bayern, D-97074 Würzburg

The time resolved ESR-technique (trESR) is a powerfull tool to study the temporal evolution of charge-transfer states (CTS) photogenerated at the donor-acceptor interface. Right after the photoexcitation, spin-polarized radical pairs are formed in the system, showing themselves as an alternating pattern of microwave absorption and stimulated microwave emission (A/E/A/E). At longer timescales the pattern converts into pure absorption one (A/A) due to free charges in the blend. The separation dynamics within the pair as well as the thermalization are assumed to be dependent on the temperature. In this contribution, we report on temperature dependent trESR studies performed on thin films of P3HT:PCBM bulk-heterojunction.