Front Cover: In article number 1900289 by R. M. Gamini Rajapakse, Davita L. Watkins, and co‐workers, electrochemical copolymerization affords near infrared‐II (100–1700 nm) absorbing copolymers with intrinsic conductivities over a wide potential window, even where it is nominally undoped. This study showcases the advantages of electro‐polymerization toward tailoring of next generation optoelectronic materials.

Block copolymers comprising benzothiadiazole were successfully electro-copolymerized leading to (BTD-T2)n(BTD-F2)m, where n and m were varied in a perfectly controllable, well-defined manner.

In this study, the electrical, dielectric and morphological analysis of composite solid polymer electrolytes containing polyethylene oxide, alumina nano-fillers and tetrapropylammonium iodide are conducted. The temperature dependence of conductivity shows activation energy of 0.23, 0.20 and 0.29 eV for electrolytes containing 0, 5 and 15 wt.% alumina, respectively, when data fitted to the Arrhenius equation. These activation energy values are in good agreement with those determined from dielectric measurements. The result confirms the fact that conductivity is activated by both the mobility and the charge carrier density. The conductivity isotherms demonstrated the existence of two peaks, at 5 and 15 wt.% Al 2 O 3 composition. The highest conductivity values of 2.4 × 10 −4 , 3.3 × 10 −4 and 4.2 × 10 −4 S cm −1 are obtained for the sample with 5 wt.% Al 2 O 3 at 0, 12 and 24°C, respectively, suggesting an enhancement of conductivity compared with that of alumina free samples.