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O: Fachverband Oberflächenphysik
O 58: Poster Session III (Solid/liquid interfaces; Metals; Semiconductors; Oxides and insulators)
O 58.1: Poster
Mittwoch, 28. März 2012, 18:15–21:45, Poster B
Dye-sensitized Zinc Oxide on Tungsten Wire Electrodes — •Tim Helbig, Melanie Rudolph, and Derck Schlettwein — Justus-Liebig-Universität Gießen, Institut für Angewandte Physik, Heinrich-Buff-Ring 16, D-35392 Gießen
Thin films of Zinc Oxide/Eosin Y were deposited on tungsten wires via electrochemical deposition from aqueous solutions by using the dye Eosin Y as a structure-directing agent (SDA). After deposition the SDA was removed by an aqueous alkaline solution, leaving behind a porous zinc oxide film. As a sensitizer, the dye D149 was adsorbed to the surface of the porous zinc oxide. The films were studied as photo anodes in dye-sensitized solar cells (DSC) using the tungsten wire as back contact. The photoelectrochemical performance was measured in an iodide-containing electrolyte and a platinum wire as counter electrode. As light source a xenon arc lamp with an energy output of 100 mW/cm2 was used. A photovoltaic efficiency of such cells of up to 1.4 % was reached but the films could not be stabilized under the present conditions. Degradation mechanisms and optimization strategies will be discussed.