Regensburg 2010 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 9: Poster: Synthesis of Nanostructured Films by Self-organization, Thermoelectric Thin Films and Nanostructures, High-k and Low-k Dielectrics, Layer Deposition Processes, Layer Growth, Layer Properties, Application of Thin Films, Surface Modification, Hard and Superhard Coatings, Metal Layers
DS 9.12: Poster
Montag, 22. März 2010, 15:00–17:30, Poster D1
Electrodeposition of ZnO for dye-sensitized cells on corrosion-resistive metal wires — •Kerstin Strauch, Melanie Rudolph, Thomas Loewenstein, and Derck Schlettwein — Institute of Applied Physics, Justus-Liebig-University Giessen, Germany. email:schlettwein@uni-giessen.de
This work is part of an initiative to develop a textile-based photovoltaic cell using the concept of dye-sensitization. For this purpose porous ZnO is deposited by electrodeposition and subsequently sensitized by an organic dye. The porous sensitized semiconductor electrode has to satisfy two conditions: First the substrate material has to be conductive and inert with the iodine containing electrolyte. Secondly the deposition of porous zinc oxide on the conductive textile or wire has to be homogenous and continuous. In this work different metal wires which had proven to be stable in the redox electrolyte were used as substrate electrodes. The conditions of electrodeposition were optimized for each of the metals. We either used a constant potential ("potentiostatic") mode in contact to an oxygen saturated ZnCl2 solution or a pulsed deposition using the reduction of nitrate in a Zn(NO3)2 solution. The deposition process was monitored by the developed current under the given conditions. The obtained films were analyzed by confocal laser microscopy and scanning electron microscopy. The films were tested for their uptake of sensitizing dyes. The properties of the obtained electrodes in dye- sensitized solar cells will be discussed.