Measurements of the transient shape of an electric current were carried out to obtain information about the coloration mechanism in an amorphous WO3(a-WO3) solid-state electrochromic device (ECD). The time dependence of the current was classified into three regions. (1) The absorption current associated with the dielectric relaxation of the oxide layers and the subsequent injection current from the electrodes to the bulk. (2) The current caused by the electrochemical reaction (coloration) at the interface between the a-WO3 and the dielectrics. (3) The current modulated by the electromotive force arising from the colored species in both a-WO3 and dielectrics. The coloration process in this solid-state ECD was investigated in connection with the response speed using kinetic analysis.
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Shizukuishi et al. (1981) studied this question.
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