Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 46: Poster Session IV

CPP 46.10: Poster

Mittwoch, 14. März 2018, 11:00–13:00, Poster A

Use of Triphenylamine Dyes With Metal Complex Electrolytes in ZnO-Based Dye-Sensitized Solar Cells . — •Andreas Ringleb, Raffael Ruess, and Derck Schlettwein — IAP, JLU Giessen, Germany

Dye-sensitized solar cells (DSSCs) may serve as an alternative to silicon-based solar cells because of low energy-payback-times and expected low costs, in particular, if the porous ZnO is prepared by electrodeposition. The triphenylamine-based organic dye D35CPDT (also known as LEG4) has been frequently used as a sensitizer with good efficiency on TiO₂ in combination with modern Co- and Cu-based electrolytes which have a high redox potential and allow fast and effective regeneration without high overpotentials. In the present work we study the combination of these different successful approaches. Porous ZnO has been electrodeposited on AZO-coated glass. Adsorption of LEG4 to the ZnO surface has been studied by varying pre-treatment of the films and optimized samples have been used to prepare DSSCs. These have been studied by means of current-voltage characteristics and detailed photoelectrochemical methods such as impedance spectroscopy, dynamic illumination and time-resolved experiments. A focus has been put on the analysis of recombination of injected electrons from the ZnO/dye interface to the redox electrolyte as one of the main loss channels in DSSCs and on mass transport of the electrolyte through the porous sensitized photo anode as an additional limiting factor.