Dresden 2011 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)
O 60.8: Poster
Mittwoch, 16. März 2011, 17:30–21:00, P4
Fast switching of the electrochromism in thin films of a perfluoroalkyl-substituted phthalocyanine — Stefanie Nagel1, Martin Lener1, •André Dragässer1, Robert Gerdes2, Sergiu Gorun2, and Derck Schlettwein1 — 1Institute of Applied Physics, Justus-Liebig-University Giessen, Germany. email:schlettwein@uni-giessen.de — 2Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ 07102, USA
Thin films of metal complexes of octakisperfluoro(isopropyl)-phthalocyanine (F64Pc) vapour-deposited on indium tin oxide electrodes were studied at negative potentials in contact to LiCl aqueous electrolyte solutions. In situ monitoring of the absorption spectra of the films during electrochemical reduction revealed electrochromic characteristics which are of possible interest for applications in displays or as smart windows. Electroneutrality of the films was preserved by intercalation of Li+ ions. The technically relevant speed of switching the absorbance characteristics by an applied potential depends on both electron conduction and ion diffusion in the matrix. The switching speed was studied by a variation of the scan rate in cyclic voltammetry and by potential step experiments. The observed charge flow and spectral changes are discussed both in view of relevance of the decisive sample parameters and a possible technical application.