Intramolecular Donor–Acceptor Regioregular Poly(hexylphenanthrenyl‐imidazole thiophene) Exhibits Enhanced Hole Mobility for Heterojunction Solar Cell Applications

Abstract

PHPIT, a new kind of intramolecular donor–acceptor side-chain-tethered hexylphenanthrenyl-imidazole polythiophene is synthesized. The more-balanced electron and hole mobilities and the enhanced visible- and internal-light absorptions in the devices consisting of annealed PHPIT/PCBM blends both contribute to a much higher short-circuit current density, which in turn led to a power conversion efficiency as high as 4.1%.