Inorganic multi-color transmissive-type electrochromic electrodes based on Fabry-Perot interferometer for full-solid smart window

Recent inorganic multi-color electrochromic electrodes frequently contain thick reflecting coatings, sacrificing transparency and limiting their applications. In the present work, a strategy for creating inorganic multi-color transmissive-type electrochromic electrodes (MCTEEs) is proposed within the context of an asymmetric Fabry-Perot interferometer, which satisfies the aesthetic requirement for color variation while maintaining adequate transmittance. Based on the optimized design, a prototype MCTEE was successfully created using the magnetron co-sputtering technique, which has a high potential for use in transparent display and decorating applications because of its good cycle stability (72.4% optical modulation remained after over 600 cycles), the fast response time (6.5 s/3.8 s for coloration/bleaching process), and the good color tunability (pink, colorless, light blue, and dark blue with various applied voltages).