C. Bechinger et al., COMPARISON BETWEEN ELECTROCHROMIC AND PHOTOCHROMIC COLORATION EFFICIENCY OF TUNGSTEN-OXIDE THIN-FILMS, Solid state communications, 101(10), 1997, pp. 753-756
We investigated the photochromic (PC) and electrochromic (EC) behavior
of sputtered tungsten oxide (WO3-y) films with different oxygen defic
iency y. It was found that both the PC and EC coloration efficiency in
crease with increasing oxygen deficiency in tungsten oxide. For PC eff
iciency, this behavior is consistent with the model of photochromism d
eveloped recently. A recently developed model based on the small polar
on transition between W5+ and W4+ states has been used to explain the
dependence of EC coloring efficiency on the oxygen deficiency in tungs
ten oxide films. This new mechanism also revealed a close relationship
between PC and EC. (C) 1997 Published by Elsevier Science Ltd.