Organic
dyes have been studied for applications in large-area,
flexible, cheap, and efficient organic electronic devices. Among them,
diketopyrrolopyrrole (DPP) has gained attention thanks to its planar
structure, photochemical and thermal stability, and easy processability.
Also, the electron-withdrawing nature of DPP makes its application
attractive in the synthesis of donor–acceptor (D–A)
copolymers, with appealing features such as the tunable energy levels
and photophysical and electrochemical properties. Inspired by these
exciting characteristics, a copolymer was developed based on DPP,
thiophene, and fluorene (PFDPP2T). Photophysical and electrochemical
studies using both experimental and theoretical approaches were performed
aiming to understand the properties of this material, such as, for
instance, the D–A characteristic and the outstanding electrochemical
stability upon oxidation that enables more than 400 cycles of p-doping.
The outcomes unveil fundamental aspects of this class of copolymers,
reinforcing their suitability for photo-electrochemical and optoelectronic
applications.