Abstract
Abstract In this article, electrochromic polymer bilayer film on indium tin oxide (ITO) coated glass is built as electrode to facilitate the diffusion and migration of ions in electrochromic devices (ECDs). We investigate the performance of device based on the bilayer film using polythiothene (PT) and poly(3-thiophene boronic acid) (P3TBA) as model polymers. Notably, the incorporation of thin P3TBA layer (P3TBA has a high polarity) can change the surface morphology of PT film (rough and uncompacted), and increase the surface area of PT/P3TBA film, which will benefit the diffusion and migration of ions in ECD based on PT/P3TBA bilayer film on ITO glass (PT/P3TBA/ITO). As a result, the performance of ECD based on PT/P3TBA/ITO is significantly improved, which exhibits a highly optical contrast (48%), coloration efficiency (298 cm2/C), short response time (the coloration time and bleaching time are 5.27 and 0.48 s), and stable cycling. Compared with ECD based on PT film on ITO glass (PT/ITO), the optical contrast of ECD based on PT/P3TBA/ITO increases 200% (16% → 48%), and its coloration efficiency increases 54% (193 → 298 cm2/C). This study suggests that rational design of bilayer film micromorphology on electrode level might be a useful strategy for fabricating high performance polymer ECDs.
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