The Electrochromic Properties of Thermally Decomposed Films of an Organic Tungsten Compound

Abstract

The electrochromic properties of thermally decomposed films of an organic tungsten compound are investigated. The films are prepared by spin-coating a toluene solution of hexaphenoxy-tungsten onto transparent conductive substrates and thermally decomposing the coated films in air. Films decomposed at relatively low temperatures (about 200°C) show good electrochromic properties, comparable to ordinary vacuum evaporation films. The write-erase property of the film becomes poorer as the decomposition temperature is increased. This degradation is due mainly to crystallization of the tungsten oxide.