Berlin 2015 – scientific programme

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DS: Fachverband Dünne Schichten

DS 20: Focussed Session: In-situ optical spectroscopy

DS 20.9: Talk

Wednesday, March 18, 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.