Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 78: Hybrid and Perovskite Photovoltaics II

CPP 78.7: Vortrag

Freitag, 16. März 2018, 11:15–11:30, C 264

Role of Förster Resonance Energy Transfer for Efficient Charge Generation at Hybrid Heterointerfaces — •Stefan Schupp, Philipp Ehrenreich, and Lukas Schmidt-Mende — Department of Physics, University of Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany

During the last two decades, tremendous progress was made in the development of efficient dye-sensitized solar cells with power conversion efficiencies of more than 10%. In this context, performance improvements are commonly related with chemical engineering, i.e. the design of new chemical compounds with optimized absorption characteristics. So far, transparent hole transporting layers are used although polymers offer the conceptual advantage to act not only as hole transporting materials but also as an additional photoactive layer. In a recent study, we have demonstrated that Förster resonance energy transfer (FRET) is a promising strategy to enhance photocurrent contributions from the polymer, while loss channels have stayed unclear. In this contribution, we will generalize our findings and offer new design rules, which help to engineer highly efficient hybrid polymer-metal oxide interfaces. By a comparison of eight different dye-polymer combinations, we tune the FRET efficiency and energy landscape at the interface systematically. This combined analysis helps to understand fundamental loss channels of hybrid heterostructures and offers strategies to bring hybrid solar cells on a competitive level.