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  4. Electrochromic metallo-supramolecular polymers showing visible and near-infrared light transmittance modulation
 
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2019
Journal Article
Title

Electrochromic metallo-supramolecular polymers showing visible and near-infrared light transmittance modulation

Abstract
Metallo-supramolecular polymers (Fe-MEPEs) based on Fe2+ ions and bis(terpyridine) ligands exhibit outstanding optical and electrochromic properties. The intensive coloration of Fe-MEPEs is caused by the metal-to-ligand charge transfer (MLCT) transition in the visible region. Thin films with high optical quality can be produced on transparent conducting glass or plastic substrates by common wet-coating techniques, e.g. dip-coating or roll-to-roll (R2R) processes. By applying a low voltage, the Fe-MEPE films can be reversibly switched between the reduced (dark) state (Fe2+) and the oxidized (bright) state (Fe3+). A further color change is visible at negative voltages resulting from a strong absorption in the near-infrared (NIR) region. Visible light transmittance changes (Dtv) > 60%, fast response times, and cycle stabilities over 10,000 switching cycles are demonstrated, which makes these electrochromic Fe-MEPEs very attractive to be used in electrochromic devices for a number of applications, e.g. in wearables, labels, architectural glazing, appliances, vehicles, and aircraft.
Author(s)
Schott, Marco  
Fraunhofer-Institut für Silicatforschung ISC  
Niklaus, Lukas  
Fraunhofer-Institut für Silicatforschung ISC  
Clade, Jürgen  
Fraunhofer-Institut für Silicatforschung ISC  
Posset, Uwe  
Fraunhofer-Institut für Silicatforschung ISC  
Journal
Solar energy materials and solar cells  
DOI
10.1016/j.solmat.2019.110001
Language
English
Fraunhofer-Institut für Silicatforschung ISC  
Keyword(s)
  • metallo-supramolecular polymers

  • electrochromism

  • electrochromic device

  • thin film coating

  • neutral tint

  • near-infrared absorption

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