Abstract
Innovative WO3·2H2O/PEDOT films with strong adhesion of the electrochromic layer and the substrate were fabricated. A WO3·2H2O/PEDOT electrochromic layer can be firmly fixed to an ethylene vinyl acetate/polyethylene terephthalate (EVA/PET) electrode using Ag as the conductive layer by a transient heating method. The electrochromic film is mechanically robust and can be twisted, folded and crumpled without performance degeneration. Improved performance has been realized by WO3·2H2O/PEDOT films compared with WO3·2H2O films due to the excellent electrical conductivity of PEDOT, including a higher of Li-ion diffusion coefficient (1.1×10−9cm2s−1), faster response time (2.6s for bleaching time and 4.4s for coloration time), higher color efficiency (180.2cm2C−1) and larger transmittance modulation (63.1%) at 956nm. The results are very promising for the next generation of deformable or implantable hidden message displays and wearable smart clothes applications.
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