Dresden 2011 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 32: Spins in Organic Materials III (Focused Session, jointly with MA -- Organisers: Salvan, Hess, Timm)
DS 32.2: Vortrag
Mittwoch, 16. März 2011, 17:15–17:30, GER 37
The influence of molecular orientation on triplet excitons in various oligo- and polythiophenes — •Hannes Kraus1, Andreas Sperlich1, Anja Keckeisen1, Carsten Deibel1, Vladimir Dyakonov1,2, Hannah Ziehlke3, Moritz Riede3, Karl Leo3, Roland Fitzner4, Egon Reinhold4, and Peter Bäuerle4 — 1Experimental Physics VI, Julius Maximilian University of Würzburg, D-97074 Würzburg — 2ZAE Bayern, D-97074 Würzburg — 3Institut für Angewandte Photophysik, TU Dresden, D-01062 Dresden — 4Institute of Organic Chemistry II and Advanced Materials, Ulm University, D-89081 Ulm
One of the intriguing issues in oPV materials is the role of triplet excitons on photogeneration of charge carriers. Evaporated oligothiophene films and solution-processed polythiophenes have been used in high-efficiency organic solar cells. Thus the electronic properties of both material classes are of great interest. Utilizing angle resolved optically detected magnetic resonance (ODMR), we investigated the triplet excitons of thin films of the quinquethiophene DCV5T (evaporated), the polythiophene P3HT and the block copolymer PCPDTBT (both spin-cast). We found a strong dependence of the triplet signatures on the crystalline ordering, especially for oligothiophenes, and attempt to connect this dependence to the intrinsic ordering of the corresponding molecular system. In combination with structural analysis, angle resolved ODMR allows to gain new insights into the physics of triplet excited states.