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Electrochromism and Photochromism of WO3 Thin Films

Published online by Cambridge University Press:  16 February 2011

C. Lefrou ,
O. Marrot  and
F. Garot
C. Lefrou
Affiliation:
Saint-Gobain Recherche, 39 quai Lucien Lefranc, 93 303 Aubervilliers Cedex, France
O. Marrot
Affiliation:
Saint-Gobain Recherche, 39 quai Lucien Lefranc, 93 303 Aubervilliers Cedex, France
F. Garot
Affiliation:
Saint-Gobain Recherche, 39 quai Lucien Lefranc, 93 303 Aubervilliers Cedex, France
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Abstract

A photochromic effect is observed in WO3-based electrochromic devices with an ion-conducting polymer as electrolyte. Upon exposure to sun light, the electrochromic cells become blue. This is due to a change of color of the WO3 electrode. The photoeffect on this layer is due to a simultaneous insertion reaction (reduction) of the WO3 material and a photooxidation of water contained in the polymer. It is reversible and therefore not destructive for the complete device. The study of the transmittance and rest potential as a function of the time of exposure to light shows that a steady state is reached in c.a. 10 hours. The addition of U.V.-cut filters changes the reached steady-state, indicating that the photochromic effect is dependent upon the structure of the WO3 material.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 369: Symposium U – Solid State Ionics IV , 1994 , 657
Copyright
Copyright © Materials Research Society 1995

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