Flexible electrochromic energy-saving windows with fast switching and bistability based on a transparent solid-state electrolyte. (7th October 2019)

• Record Type: Journal Article
• Authors: Zeng, Jinming; Wan, Zhijun; Zhu, Mimi; Ai, Lianghui; Liu, Ping; Deng, Wenji
• Is Part Of: Materials chemistry frontiers. Volume 3:Number 11(2019)
• Page Start: 2514
• Page End: 2520
• Publication Date: 2019-10-07
• Subjects: Materials science -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1039/c9qm00562e
• Languages: English
• ISSNs: 2052-1529

Abstract

Abstract : The preparation and electrochromism of flexible electrochromic devices with fast switching and bistability based on a transparent solid-state electrolyte. Abstract : A transparent solid-state electrolyte (T-SE) consisting of polymethacrylate (PMMA), polyoxypropylene glycol (PPG), and lithium perchlorate (LiClO4 ) was prepared. Subsequently, using perylene-3, 4, 9, 10-tetracarboxylic dianhydride (PTCDA) and 5, 5′′′-di(methylbenzoate)-2, 2′:5′, 2′′:5′′, 2′′′-quater(3, 4-ethylenedioxythiophene) (4EDOT-2B-COOCH3 ) as the electrochromic active materials, electrochromic devices (ECDs) (including rigid and flexible ECDs) based on T-SE were fabricated. ECDs possessed a sandwich structure consisting of an indium tin oxide (ITO) glass (or ITO polyethylene terephthalate (PET))/PTCDA (or 4EDOT-2B-COOCH3 ) film/T-SE/ITO glass (or ITO PET). The ECDs exhibited a fast switching speed and high optical contrast. The doping/dedoping switching times of flexible ECDs (ITO PET/PTCDA film/T-SE/ITO PET and ITO PET/4EDOT-2B-COOCH3 film/T-SE/ITO PET) were 2.4 s/5.6 s and 5.2 s/2.6 s, respectively; their optical contrast values were 61.0% and 48.6% at 700 nm, respectively. Notably, the flexible ECDs (ITO PET/PTCDA film/T-SE/ITO PET and ITO PET/4EDOT-2B-COOCH3 film/T-SE/ITO PET) also showed suitable bistability (open-circuit memory); they could retain 81.5% and 74.7% of their original optical contrast at 700 nm after removing the drive voltage for 12 hours, respectively. Furthermore, the flexible ECDs also exhibited similar electrochromic properties under bending conditions.