Berlin 2015 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 20: Focussed Session: In-situ optical spectroscopy
DS 20.9: Vortrag
Mittwoch, 18. März 2015, 12:45–13:00, H 0111
Space and Time Resolved Transmission Spectroscopy of Tungsten Oxide Thin Films — •Simon Burkhardt, Sabrina Darmawi, Matthias T. Elm, and Peter J. Klar — I. Physikalisches Institut, Justus-Liebig-Universität, Heinrich-Buff-Ring 16, 35392 Gießen
Tungsten-IV oxide (WO3) is of great interest for numerous applications due to its electrochromic behavior, where the intercalation of ions results in a change of the optical properties. Although the electrochromism of WO3 has been studied intensively during the last decades, the details of the ion intercalation mechanism and the corresponding coloration are still under discussion. In order to provide some new insights, WO3 thin films were investigated by a combination of electrochemical and optical measurement techniques. The thin films were obtained by the depositions of WO3 powder onto TCO-coated glass substrates via electron beam evaporation. Using transmission spectroscopy the coloration was monitored during the intercalation of hydrogen ions. The results obtained are correlated with structural changes of the thin films during the intercalation, which were investigated using XPS and XRD. Furthermore, similar measurements on laterally patterned WO3 thin films are presented, which were performed in order to investigate and simulate the diffusion of the ions during the intercalation process.