Solution processable neutral state colourless electrochromic devices: effect of the layer thickness on the electrochromic performance

Tahtali G., Has Z., Doyranli C., Varlikli C., KOYUNCU S.

JOURNAL OF MATERIALS CHEMISTRY C, vol.4, no.42, pp.10090-10094, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 4 Issue: 42
  • Publication Date: 2016
  • Doi Number: 10.1039/c6tc04112d
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.10090-10094
  • Çanakkale Onsekiz Mart University Affiliated: Yes


In this study, a neutral state colourless electrochromic device fabricated through a solution process is introduced. The device contains indium doped transparent oxide coated glass as the transparent conductive electrode, poly(N-(2-ethylhexyl) carbazol-3,6-diyl) (PCbz) as the anodically colouring material, poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) as the ion storage layer and a lithium perchlorate based conducting gel electrolyte. A maximum optical contrast (Delta T%) of 58% at 800 nm is achieved by optimizing the film thickness of both the organic layers. The device that has layers of 220 nm PCbz and 120 nm PEDOT: PSS thickness revealed a high coloration efficiency (1246 cm(2) C-1) and colouring and bleaching response times of 5.6 s and 2.3 s, respectively.