A fast switching, low band gap, p- and n-dopable, donor-acceptor type polymer

A new electrochromic polymer, poly(2,3-diplienyl-5,7-bis(3,4-ethylenedioxy-2-thienyl)thieno[3,4-b]pyrazine) (PGS) is electrochemically synthesized and its electrochromic properties are reported. PGS showed well defined electrochemical characteristics with a relatively low oxidation potential of 0. 18 V vs Ag/Ag+. Polymer also exhibited a definite redox couple at applied cathodic potentials, indicating n-doping characteristic of the polymer. Spectroelectrochemistry and previously unattempted technique, ESR data was utilized to confirm the existence of dual type pi-pi* transitions centered at 522 nm and 1062 nm. The polymer exhibits multi-color electrochromism where three distinct colors are achievable by varying the redox state of the polymer between saturated red-purple color, blue and colorless-gray in neutral, n- and p-doped states, respectively. Copolymerization as a facile method to tune the electrochromic properties of the material was also realized in the presence of 2,2'-bis(3,4-ethylenedioxythiophene) (BiEDOT). Both polymers exhibit very short switching time (0.4 s) and express more than 45% change in the transmittance in the near-IR region, which could make these polymers useful in applications in NIR electrochromic devices.

Citation Formats
E. G. Günbaş, P. ÇAMURLU, I. M. Akhmedov, C. Tanyeli, A. M. Önal, and L. K. Toppare, “A fast switching, low band gap, p- and n-dopable, donor-acceptor type polymer,” JOURNAL OF ELECTROANALYTICAL CHEMISTRY, vol. 615, no. 1, pp. 75–83, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48888.