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Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 15: Energy materials (other than photovoltaics)

HL 15.3: Vortrag

Dienstag, 2. April 2019, 10:00–10:15, H33

Increasing the Spectroelectrochemical Performance of WO3 Films Prepared by Spin-Coating with Additives — •Thi Hai Quyen Nguyen and Derck Schlettwein — Justus-Liebig-Universität Gießen, Institut für Angewandte Physik

Tungsten oxide (WO3) can be widely used as an electrochromic material in smart windows. In the presence of an electrolyte containing small cations such as Li+ ions the application of a negative voltage leads to reversible coloration of WO3 thin films. The electrochromic properties of WO3 including the charge transfer strongly depend on the internal structure of the films. In this work, thin films of WO3 were prepared by spin-coating followed by heat-treatment using a precursor solution based on peroxotungstic acid with optional addition of poly(ethyleneglykol) of different molecular weight and similar components. The influence of the additives on the morphology and film structure was examined by SEM and XRD. The electrochromic properties of the films were studied by cyclic voltammetry and chronoamperometry with spectroscopic monitoring in a three-electrode-setup with LiClO4 in propylencarbonate as electrolyte. The films prepared with additives clearly showed an improvement in the rate and in the extent of optical switching between the coloring and bleached state with a clearer color impression. The diffusion coefficient of the Li+ ions in WO3 could be increased confirming a facilitated diffusion of the ions through the film network. Hence, the presence of additives created an improved film structure of WO3 which can be promising for smart windows with high efficiency.

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