Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 31: P3: Hybrid Photovoltaics and Preovskites

CPP 31.1: Poster

Tuesday, March 17, 2015, 14:00–16:00, Poster B

Influence of the Solvent on the Charge Transport Dynamics in ZnO-based Dye-Sensitized Solar Cells — •Christoph Richter, Max Beu, and Derck Schlettwein — Institute of Applied Physics, Justus-Liebig-University Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen

In electrodeposited ZnO-based dye-sensitized solar cells (DSCs) the common solvent is a mixture of 4:1 vol % ethylene carbonate : acetonitrile. Since ethylene carbonate is a solvent with a high viscosity compared to acetonitrile non-negligible contributions to the series resistance were observed. To overcome this problem we have studied different mixtures of 3-methoxypropionitrile, valeronitrile or ethylene carbonate with acetonitrile. A detailed photoelectrochemical analysis was conducted to understand the differences observed in the measured IV-curves. By using intensity modulated current and photovoltage spectroscopy (IMPS, IMVS) and impedance spectroscopy (EIS) the influence of the solvent mixtures on the charge transport and recombination reactions in the DSCs could be clarified. The results, further, provide additional input to an ongoing discussion why ZnO-based DSCs generally lack behind the reported efficiencies of TiO₂-based DSCs.