Dresden 2006 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 32: Photovoltaic

HL 32.16: Vortrag

Mittwoch, 29. März 2006, 18:30–18:45, BEY 118

Electrochemical grown ZnO/EosinY hybrid films on oriented substrates — •Thomas Loewenstein¹, Christian Neumann², Thorsten Kraemer², Bruno K. Meyer², Tsukasa Yoshida³, and Derck Schlettwein¹ — ¹Institut für Angewandte Physik, JLU Giessen, Heinrich Buff-Ring 16, 35392 Giessen — ²Experimentalphysik I, JLU Giessen, Heinrich Buff-Ring 16, 35392 Giessen — ³Graduate School of Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan

The sensitization of wide-bandgap semiconductors is an attractive approach to a photoelectrochemical photovoltaic cell. Porous, yet crystalline ZnO electrodes were deposited in electrochemical reactions from aqueous zinc salt solutions induced by a local pH-increase at the working electrode during the reduction of oxygen, a reaction compatible with a large number of conductive substrates. Single crystalline substrates allow to investigate the structure and texture to far higher extent than typical polycrystalline or amorphous substrates. (0001) GaN offers good possibilities of epitaxial growth of ZnO. In this study, ZnO/dye hybrid materials were electrodeposited on (0001) GaN and on (0001) ZnO. Scanning electron microscopy (SEM) revealed domains of different crystal sizes that were correlated to fluctuations in the substrate work function. Crystalline ZnO was deposited on GaN as proven by X-ray diffraction (XRD). The intensity pattern showed a preferential orientation with the c- plane of ZnO parallel to GaN (0001). XRD rocking curves indicated a high level of in-plane orientation of the grown ZnO crystalline domains. The peak position spoke in favour of a modification of the ZnO crystal lattice by the dye molecules adsorbed during the growth of ZnO.