Dresden 2009 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 26: Poster II
DS 26.57: Poster
Mittwoch, 25. März 2009, 09:30–12:30, P5
Influence of TCO substrate on electrochromic properties of WOx thin films — •Jennifer Stiebich, Thomas Leichtweiß, Angelika Polity und Bruno K. Meyer — Justus- Liebig- Universität Gießen, I. Physikalisches Institut, Heinrich-Buff-Ring 16, 35392 Gießen
Electrochromic tungsten oxide thin films in contact with a suitable electrolyte change their optical transmission upon the application of a potential. A smart window device consists of an optical active and an ion storage layer which are seperated by an ion conducting electrolyte. Both electrodes are deposited on top of a transparent conductive oxide film (TCO).
In order to increase the optical tranmsission of uncoloured smart windows the substitution of the commonly used flourine-doped tin oxide (FTO) TCO by a more transparent material should be considered.
This work concerns the influence of the interface between the TCO and the electrochromic WOx film on the switching properties. Non stoichiometric tungsten oxide layers have been deposited by radio-frequency magnetron sputtering on flourine-doped tin oxide (FTO) and on aluminum-doped zinc oxide (AZO) substrates. The electrochemical behavior of these electrodes has been characterized by cyclic voltammetry and the Li+-ion chemical diffusion coefficients have been evaluated by GITT (galvanostatic intermittent titration technique). The morphology of TCO- and WOx-Layers has been analyzed by scanning electron microscopy (SEM) and atomic force microscopy (AFM).
The influence of the TCO’s morphology on the electrochemical and optical properties of the tungsten oxide layers is discussed.