High performance black-to-transmissive electrochromic device with panchromatic absorption based on TiO2-supported viologen and triphenylamine derivatives |
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| Affiliation: | 1. Electronics and Telecommunications Research Institute, Nature-mimic I/O interface Research Section, 218 Gajeong-roYuseong-gu, Daejeon 305-700, Republic of Korea;2. University of Science and Technology, Advanced Device Technology, 217 Gajeong-roYuseong-gu, Daejeon 305-350, Republic of Korea;1. IK4-CIDETEC, Paseo Miramon 196, E-20014 Donostia-San Sebastian, Spain;2. Fraunhofer Institute for Silicate Research (ISC), Neunerplatz 2, 97082 Wuerzburg, Germany;3. IREQ – Institute Recherche d′Hydro-Québec, 1800 Boulevard Lionel Boulet, Varennes, Canada QCJ3X 1S;1. College of Chemistry, Jilin University, Changchun 130012, PR China;2. State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, PR China;3. Department of Chemistry and Materials Science Program, University of New Hampshire, Durham, New Hampshire 03824, United States;1. CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, PR China;2. School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei 230601, PR China |
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| Abstract: | A novel black-to-transmissive electrochromic device based on TiO2-supported viologen and triphenylamine derivatives was designed and constructed via the absorption-complementary approach. In the device, cathodically coloring electrochromic material 1,4-bis((N-phosphono-2-ethyl)-4,4′-bipyridinium)-methyl]-benzene tetrachloride acted as working electrode and novel anodically coloring electrochromic material (4-((4-(dimethylamino)-phenyl)(4-methoxyphenyl)-amino)-benzyl) phosphonic acid acted as counter electrode. The assembled electrochromic device achieved panchromatic absorption over entire visible spectrum with almost zero transmittance in colored state. The optical contrast (ΔT) of the device realized in this work was comparable to the highest value (60%) among all reported black-to-transmissive ECDs. Furthermore, excellent cycling stability was achieved, which maintained almost 80% of the initial ΔT value at 570 nm after continuous 100,000 switchings. These outstanding comprehensive electrochromic performances potentially make this device a promising candidate for electrochromic device applications. |
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| Keywords: | Black-to-transmissive Electrochromic device Viologen Triphenylamine Stability Chemisorption |
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