Tahtali, GurhanHas, ZeynepDoyranli, CeylanVarlikli, CananKoyuncu, Sermet2025-01-272025-01-2720162050-75262050-7534https://doi.org/10.1039/c6tc04112dhttps://hdl.handle.net/20.500.12428/21887In 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.eninfo:eu-repo/semantics/closedAccessColoration EfficiencyViologenFilmsPolymersContrastWindowsCarbazoleArticle442100901009410.1039/c6tc04112dQ1WOS:0003872290000232-s2.0-84994017762Q1