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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Organic Semiconductors

CPP 8.15: Poster

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

Charge Generation and Recombination in Perylene Dye-sensitized Solar Cells — •Michael Meister, Belinda Nölscher, Ian Howard, Henrike Wonneberger, Chen Li, Klaus Müllen, and Frédéric Laquai — Max Planck Institute for Polymer Research, Mainz, Germany

All-organic sensitizer molecules are interesting alternatives to replace the commonly used expensive Ru-complex dyes in dye-sensitized solar cells (DSC). Dyes with large extinction coeffcients are especially interesting for solid state DSCs, which work better with thinner mesoporous TiO₂ structures. Perylene derivatives have attracted strong interest, since they combine a strong absorption with reasonably good device efficiencies if used with Spiro-MeOTAD as solid state hole transporter [1]. Here we present a photophysical study of perylene monoimide dyes (PMI) for DSCs with different functional groups attached to the core that influence the position of the HOMO and LUMO. By employing quasi steady-state photoinduced absorption spectroscopy and transient absorption spectroscopy on device-like structures, we gain insight into the mechanisms of charge generation and recombination. For instance, we found that a rise of the LUMO energy, which should in principle facilitate electron injection into the TiO₂, does not necessarily lead to more efficient charge separation. Our investigations aim to a thorough understanding of the structure-property-relationship of these PMI-based organic dyes in solid state DSCs.

1. Cappel, U.B., et al., J. Phys. Chem. C, 2009. 113(33): p. 14595-14597.