Abstract
Three diketopyrrolopyrrole-based donor–acceptor copolymer semiconductors were synthesized by Stille coupling polymerization and their structural, photophysical, electrochemical, and field-effect charge transport properties were characterized. The new copolymers, poly[3,6-(2,5-bis(2-hexyldecyl)pyrrolo[3,4-c]pyrrole-1,4-dione)-alt-1,2-bis-(2′-thienyl)vinyl-5′,5″-diyl] (HD-PPTV), poly[3,6-(2,5-bis(2-hexyldecyl)pyrrolo[3,4-c]pyrrole-1,4-dione)-alt-1,2-bisphenylvinyl-4′,4″-diyl] (HD-PPPV), and a 50:50 random copolymer (PPTPV), have moderate number-average molecular weights (21800–88800 g/mol). The copolymers have optical absorption bands in the visible to near-IR regions with optical bandgaps that varied from 1.22 eV for HD-PPTV to 2.0 eV for HD-PPPV. Ionization potentials of 5.14–5.48 eV and electron affinities of 3.13–3.34 eV were derived from cyclic voltammetry. Ambipolar charge transport was seen in transistors based on HD-PPTV and PPTPV, whereas only hole transport was observed in HD-PPPV. Field-effect tr...
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call