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Flexible electrochromic devices prepared on ultra-thin ITO glass

: Schott, Marco; Niklaus, Lukas; Müller, Christine; Bozkaya, Begüm; Giffin, Guinevere A.

Volltext ()

Materials Advances. Online journal 2 (2021), Nr.14, S.4659-4666
ISSN: 2633-5409
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ISC ()
electrochromic devices (ECDs); metallo-supramolecular polymers (MEPEs); optoelectronic property; wet-chemical deposition; ITO-coated ultra-thin and flexible glass

Electrochromic devices (ECDs) containing iron-based metallo-supramolecular polymers (Fe-MEPE) and Prussian blue (PB) as active electrode materials, a polymer electrolyte and flexible ultra-thin indium tin oxide (ITO) glass as transparent conductive substrate are demonstrated here. The electrochromic Fe-MEPE and PB thin films were deposited on ultra-thin ITO glass by means of dip coating and electrodeposition, respectively, and characterized optically and (spectro-)electrochemically. By applying a low voltage of 2.5 V/-0.5 V, the Fe-MEPE/PB ECDs can be reversibly switched from a blue-colored dark state to a nearly colorless bright state with a visible light transmittance (tv) change from 8% to 58%. The devices exhibit a fast response for decoloration/coloration and good cycling stability tested over 250 switching cycles without any substantial loss of optical contrast. Thus, these ECDs based on ultra-thin glass are very attractive for flexible, lightweight, and low-power electrochromic applications, e.g., in architectural or automotive glazing, aircraft, marine, home appliances, and displays.