Abstract
Stacked WO3/Ag/WO3 (WAW) films were employed as both transparent electrodes and electrochromic materials. These nontoxic, low-cost WAW films that were prepared at room temperature exhibited not only low sheet resistance (12.2Ω/□) and high transmittance (>80%) but also compelling electrochromic performance with high optical contrast (53%) at 650nm, long-term cycling stability (3000 cycles), and short switching time (coloration time=11s; bleaching time=10.5s). The coloration efficiency of the WAW films was 136cm2 C–1, which is higher than those of most electrochromic transition metal oxides. In addition, by utilizing such bi-functional films, the flexible electrochromic film with acceptable performance was obtained.
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