Large-Area Flexible Electrochromic Devices with High-Performance and Low-Power Consumption Enabled by Hydroxyhexyl Viologen-Substituted Polyhedral Oligomeric SilsesquioxaneClick to copy article linkArticle link copied!
- Fayong SunFayong SunSchool of Chemical Engineering, Pusan National University, Busan 46241, Republic of KoreaMore by Fayong Sun
- Joo Hee EomJoo Hee EomSchool of Chemical Engineering, Pusan National University, Busan 46241, Republic of KoreaMore by Joo Hee Eom
- Do Yeon KimDo Yeon KimSchool of Chemical Engineering, Pusan National University, Busan 46241, Republic of KoreaMore by Do Yeon Kim
- Gaurav K. PandeGaurav K. PandeSchool of Chemical Engineering, Pusan National University, Busan 46241, Republic of KoreaMore by Gaurav K. Pande
- Hyejin JuHyejin JuSchool of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of KoreaMore by Hyejin Ju
- Han Gi ChaeHan Gi ChaeSchool of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of KoreaMore by Han Gi Chae
- Jong S. Park*Jong S. Park*Email: [email protected]School of Chemical Engineering, Pusan National University, Busan 46241, Republic of KoreaDepartment of Organic Material Science and Engineering, Pusan National University, Busan 46241, Republic of KoreaMore by Jong S. Park
Abstract
In this work, we prepared octa-hydroxyhexyl viologen-substituted polyhedral oligomeric silsesquioxane (OHHV-POSS) as an organic–inorganic composite material applicable for large-area flexible electrochromic devices (FECDs). The organic–inorganic hybrid structure supported by the POSS cage and the enhanced interaction between hydroxyl end-groups and lithium salts can effectively increase the ionic conductivity of the ion gel films, thereby improving the electrochromic performance capabilities. Homogeneous ion gel was obtained with polyvinyl butyral and a lithium salt, and outstanding electrochromic properties were observed during electrochromic device operations. The FECDs of various sizes were fabricated for systematic evaluation, and the device of up to 22.5 × 19.5 cm2 was successfully constructed using the simple doctor blade coating method. The prepared large-area FECDs achieved a large transmittance difference of 70.0% at 604 nm, fast switching times of 21.1 and 18.0 s, high coloration efficiency of 260.61 cm2/C, long-term cycling stability of up to 300 cycles, and low power consumption of about 250 μW/cm2. Furthermore, the device was maintained stably in various application tests for heat insulation and storage, UV resistance, and mechanical stability. High performance and low power consumption of OHHV-POSS prove suitable for large-area FECDs, suggesting promising potential for smart windows, wristbands, and eyewear products.
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