Donor-acceptor type super-structural triazine cored conducting polymer containing carbazole and quinoline for high-contrast electrochromic device

Abstract

Star shaped functionalized molecules allow the production of sophisticated nano devices by using them as the building blocks for the formation of superstructured macromolecules. Here, we address star-shaped molecule which is formed by quinoline and electroactive carbazole functionalized triazine (TQEC). Using quinoline as electron accepting (A) and carbazole as electron donating (D) moiety, the resulting conductive polymer is designed to have high optical contrast. The cross-linked polymer (PTQEC) characterized after the electropolymerization of the A/D type molecule has been found to have superior optical and electrical properties. It has high optical contrast (71% at 675 nm), fast switching time about 3 s and high long time redox stability (91.75%). As a result of the spectroelectrochemical and electrochromic characterization, it is determined that PTQEC is transparent and green colored in its neutral and oxidized states, which is a desirable property for smart windows. Therefore electrochromic devices (ECDs) depending on PTQEC and PEDOT were established, where PEDOT functioned as the cathodically coloring layer. Optical and electrochemical characterizations of the device in the way of the optical contrast (51% at 540 nm), switching time (about 3 s), open circuit memory, redox stability (95.36%) and colors were investigated.