| Abstract: | The battery-like structure of electrochromic devices warrants the application of a stoichiometric oxidation-reduction model to interpret and to optimize their operation. Of particular significance is the variation of the potential of electrochromic materials with composition, the bleached state absorption coefficients, their electrochemical stability limits and their coloration functionality versus Faradaic charge. Once these input parameters are known, the optical transmission spectrum of electrochromic light modulating devices can be predicted as a function of terminal voltage given certain assumptions about the thickness and redox state of the electrochromic and counter electrode materials on device assembly. The latter is not readily determined directly, but may be derived from properties of the two terminal device. Furthermore, the electro-optical characteristics of the two terminal device can be used to determine the source of any deviation from its optimal dynamic range. |
