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Thin Films of Antimony-Tin Oxide as Counter-Electrodes for Proton Working Electrochromic Devices

  • N. Naghavi (a1), C. Marcel (a1), L. Dupont (a1), A. Rougier (a1) and J-M. Tarascon (a1)...

Abstract

We report here on thin films proton-working electrochromic devices based on the wellknown tungsten oxide as the coloring electrode, and Antimony Tin Oxide (ATO) as the ionstorage counter-electrode. We show that films deposited by Pulsed Laser Deposition (PLD) technique have an apparent Sb solubility up to 70 at %, and exhibit unusual electrochromic properties. Through potentiostatic tests we'll demonstrate that depending on the composition which influences film morphology, the Sn-Sb-O films could either present a faradic or a capacitive-like behavior, associated to a color or a neutral switching over a wide range of potentials, respectively. The structural properties of ATO films are characterized by X-ray diffraction and transmission electron microscopy (TEM). Electrochromic behavior is studied by means of cyclic voltamperometry coupled with ex situ optical transmittance measurements in the visible range. The maximum proton-storage capacity is observed for ATO films containing 40–50 at % Sb, while being quasi-neutral when switching over a wide range of potentials. These compositions are finally retained for the assembly of our WO3/proton-electrolyte/ATO devices, whose performances are reported.

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1. Monk, P. M. S., Mortimer, R. J., Rosseinsky, D. R., in Electrochromism Fundamentals and Applications (VCH, New York, 1995).
2. Granqvist, C. G., Handbook of Inorganic Electrochromic Materials, (Elsevier, Amsterdam, 1995).
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5. Marcel, C., Hegde, M. S., Rougier, A., Maugy, C., Guéry, C., Tarascon, J. M., Electrochem. Acta, 46, 2097 (2001).
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Thin Films of Antimony-Tin Oxide as Counter-Electrodes for Proton Working Electrochromic Devices

  • N. Naghavi (a1), C. Marcel (a1), L. Dupont (a1), A. Rougier (a1) and J-M. Tarascon (a1)...

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