Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 18: Solid-liquid Interfaces II

O 18.1: Talk

Monday, March 31, 2014, 16:00–16:15, WIL A317

Changes in Potential During Pulsed Galvanostatic Deposition of Zinc Oxide on Gold — •Martina Stumpp and Derck Schlettwein — Institute of Applied Physics, Justus-Liebig-University Giessen, Germany

Zinc oxide (ZnO) is a promising electrode material for the application in various devices in the fields of chemistry, optics and electronics. Electrochemical deposition is an environmentally-friendly and energy-efficient technique for the deposition of crystalline ZnO. As a solution-based technique, it allows to prepare films on temperature-sensitive substrates and independent on substrate shape leading to a variety of optional device geometries. Electrodeposition of ZnO was carried out under pulsed galvanostatic conditions from aqueous zinc nitrate solutions on Au wires, sheets, microstructured bands or Au-coated polyamide threads. The voltage-time curves attained during these experiments were analyzed and three significant stages were observed for all depositions regardless of the geometry of the substrate despite limitation of the reaction by diffusion processes. The three stages were discussed under variation of the pulsating current density, the deposition time, but also by polarization of only one of two sets of microstuctured band electrodes. A correlation between an abrupt drop in the potential and the completed coverage of the Au electrode surface was seen. The detailed characterization of each stage in the potential-time curves allows to prepare thin compact ZnO films without pinholes on a given substrate.