Photoelectrochemical characterization of dye-modified ZnO hybrid thin films prepared by electrochemical deposition [Elektronische Ressource] / von Kazuteru Nonomura

Photoelectrochemical Characterization of Dye- Modified ZnO Hybrid Thin Films Prepared by Electrochemical Deposition Dissertation zur Erlangung des Doktorgrades der Naturwissenschaften (Dr. rer. nat.) vorgelegt dem Fachbereich 7 Institut für Angewandte Phyik der Justus Liebig-Universität Gie βen von Kazuteru Nonomura aus Gifu Mai 2006 2 Referees for the dissertation: Prof. Dr. D. Schlettwein Prof. DrB. K.Meyer 3 Abstract Dye- sensitized electrodeposited ZnO thin films were studied in their photoelectrochemical characteristics. Such electrodes can be applied for dye-sensitized solar cells. The main analysis techniques were wavelength- dependent photocurrent measurements to obtain the incident photon to current conversion efficiency (IPCE) of the films as well as time- and frequency- resolved measurements of the photocurrent (IMPS) and photovoltage (IMVS) to characterize in detail individual steps of photoelectrochemical reactions. The films were further analysed in their absorption spectrum, SEM, film thickness, dye content, porosity and surface area. 5,10,15,20-tetrakis-(4-sulfonatophenyl)porphyrin (TSTPPZn), 2,9,16,23-tetrasulfophthalocyanine (TSPcZn), Eosin Y and Coumarin 343 were used as sensitizer.