Dresden 2009 – wissenschaftliches Programm
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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices
SYOP 4: Organic Photovoltaics: from Single Molecules to Devices
SYOP 4.10: Poster
Donnerstag, 26. März 2009, 16:30–19:00, P1A
Photoinduced absorption studies on dicyanovinyl-oligothiophene thin films for application in small molecule organic solar cells — •Hannah Ziehlke1, Rico Schüppel1, Moritz Riede1, Egon Reinold2, Peter Bäuerle2, and Karl Leo1 — 1Institut für Angewandte Photophysik, Technische Universität Dresden — 2Insitut für Organische Chemie II und neue Materialien, Universität Ulm
Oligothiophenes capped with electron-withdrawing dicyanovinyl groups are promising candidates for applications in small molecule organic solar cells with reached efficiencies of 3.4 % [1]. In blend layers with fullerene C60 as acceptor material, the dicyanovinyl-oligothiophenes (DCVnT) act as donor material. The variation of the HOMO energies along the series n=3...6 have significant influence on the charge separation process at the donor acceptor interface.
The energetic and dynamic properties of the long lived photoexciations present at this interface can be obtained by photoinduced absorption (PIA) spectroscopy . We here present the characterisation of DCVnT with varying chain length via PIA spectroscopy. By analyzing recombination dynamics of the triplet excitons and cation states with respect to the existing models of mono- and bimolecular recombination processes, lifetimes and generation efficiencies can be compared. Likewise the temperature dependence of the lifetimes of triplet excitons and cations is evaluated.
[1] K. Schulze, M. Riede, E. Brier, E. Reinold, P. Bäuerle, and Karl Leo, J. Appl. Phys. 104, 074511 (2008)