Figure 2.

Normalized UV–vis absorption spectra of a) the dibrominated monomer films, and f‐BTI2‐based polymers b) in diluted chloroform solution (10⁻⁵ m) and c) as thin films. d) Cyclic voltammograms of the polymer thin films in 0.1 m tetra(n‐butyl)ammonium hexafluorophosphate acetonitrile solution with Fc/Fc⁺ as the external standard. e) FMO energy‐level alignment of polymers. f) Optimized molecular geometries for trimer of the polymer repeating unit. The calculations were performed at the B3LYP/6‐31G(d,p) level, and the alkyl chains were replaced with a methyl group for calculation simplicity.