Berlin 2012 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 38: Poster III: Resistive switching (jointly with DF, KR, HL); Thermoelectric materials (Focused session); Micro- and nanopatterning (jointly with O); Ion irradiation effects
DS 38.33: Poster
Donnerstag, 29. März 2012, 17:30–19:00, Poster E
Diffusion-controlled Electrochemical Growth of Porous ZnO on µ-structures — •Christian Lupo and Derck Schlettwein — Justus-Liebig-Universität Gießen, Institut für Angewandte Physik, Heinrich-Buff-Ring 16, D-35392 Gießen
Porous ZnO films were prepared by electrochemical deposition on interdigitated microstructures of gold-, silver- or platinum band electrodes. The electrodeposition was realized at a constant electrode potential of a rotating electrode from an aqueous ZnCl2 solution in the presence of the xanthene dye Eosin Y. The deposition conditions were kept constant, except the deposition time and the rotation speed. The interdigital electrode size, gap width and the number of electrode bands were varied. The growth of ZnO was characterized by the observed deposition current and by scanning electron microscopy. The comparison with a model of spherical diffusion reveals limitations of mass transport towards the edges of the bands during extended growth. Application of this model to the process of electrochemical deposition provides useful contributions to the further development towards a controlled growth of semiconducting oxide films on microelectrodes. Additional options and limitations of the model in this respect will be discussed.