Regensburg 2013 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 32: Poster Session IV: Atomic layer deposition; Organic thin films; Organic Electronics and Phototovoltaics; Organic Materials for Spintronics - from spinterface to devices; Thin film photovoltaic materials and solar cells
DS 32.56: Poster
Donnerstag, 14. März 2013, 17:00–20:00, Poster B2
Influence of surface treatments on the charge recombination characteristics in porous ZnO for dye-sensitized solar cells — •Christoph Richter, Max Beu, and Derck Schlettwein — Institute of Applied Physics, Justus Liebig University of Giessen, Heinrich Buff-Ring 16, 35392 Giessen, Germany.
ZnO films to be used in dye-sensitized solar cells (DSC) can be grown by electrochemical deposition of a porous ZnO/EosinY hybrid material from an aqueous solution of ZnCl2. In a subsequent step the EosinY has to be desorbed to provide a porous network of ZnO for the adsorption of a sensitizer. The step of EosinY desorption is performed in an aqueous solution of 10.5 pH KOH. This treatment can alter the surface of ZnO which typically leads to changes in the charge transfer characteristics (mainly recombination) at the semiconductor/electrolyte interface in the assembled DSC. In this work different methods of EosinY desorption and different post-treatment steps of the surface are studied. The consequences of the different treatment steps on the charge transfer from porous ZnO to an iodine-containing electrolyte are studied by IV-curves and electrochemical impedance spectroscopy. Appropriate strategies to compensate surface changes introduced by the desorption step of EosinY are presented.