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Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session III

CPP 37.36: Poster

Mittwoch, 3. April 2019, 11:00–13:00, Poster B1

Consequences of Ionic Adsorption on the Photovoltage in Dye-sensitized Solar Cells — •Raffael Ruess1, Sabina Scarabino2, Andreas Ringleb1, Kazuteru Nonomura3, Nikolaos Vlachopoulos3, Anders Hagfeldt3, Gunther Wittstock2, and Derck Schlettwein11Justus-Liebig-Universität Gießen, Institut für Angewandte Physik — 2Universität Oldenburg, Institute of Chemistry — 3Ecole Polytechnique Federale de Lausanne, Institute of Chemical Sciences and Engineering

Reversible redox couples that allow faster charge transfer than the classical I/I3 can improve the performance of dye-sensitized solar cells (DSSCs). In our work we study a cationic Co-based redox couple that promises high open-circuit photovoltages Voc by reducing the energy-loss during the dye regeneration process. However, we found that such cations lead to different surface reactions with oxide semiconductors compared to the anionic I/I3. By using photoelectrochemical and optical techniques we noticed that the semiconductor surface charge plays a major role in determining Voc by stabilizing or destabilizing the electronic states in the semiconductor. Further, light-harvesting of the dye is influenced by electric fields arising from adsorbed ions at the semiconductor surface inducing a Stark effect on the molecular orbitals. We conclude that the ionic character of electrolyte components such as the redox couple or electrolyte additives significantly influence the energetics in the cell and, thus, Voc. Our work shows that the control of semiconductor surface charge is key in improving the DSSC performance.

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