V0.50TI0.50OX THIN-FILMS AS COUNTERELECTRODES FOR ELECTROCHROMIC DEVICES

Thin films of V0.50Ti0.50Ox have been deposited by RF sputtering from metallic targets. Their use as potential counterelectrodes in electroc hromic devices has been investigated. It is found that although they a re slightly yellow looking in transmission, the films can reversibly s tore relatively large amounts of charge, whilst showing a reasonably l ow electrochromic colouration efficiency. The electrochemistry of V0.5 0Ti0.50Ox is found to be simple, in fact rather similar to that of WO, , making it an almost ideal material to use in such a variable transmi ssion device. (C) 1998 Elsevier Science B.V. All rights reserved.