Asymmetric Glycolated Substitution for Enhanced Permittivity and Ecocompatibility of High-Performance Photovoltaic Electron Acceptor.

ABSTRACT: Traditional organic photovoltaic materials exhibit low dielectric constants (ε_r) of 3 to 4, restricting the further enhancement of power conversion efficiencies (PCEs) of organic solar cells (OSCs). Herein we design and synthesize a fused-ring electron acceptor named Y6-4O through introducing an asymmetric highly polarizable oligo(ethylene glycol) side chain onto the pyrrole unit of Y6. Compared with alkylated Y6 (ε_r = 3.36), asymmetric glycolated Y6-4O shows a notably higher ε_r value of 5.13 and better solubility in nonhalogen solvents. Because of the higher ε_r value, the devices based on as-cast PM6:Y6-4O processed using toluene exhibit a higher charge separation yield, slower bimolecular recombination kinetics, and less voltage loss relative t

SUBMITTER: Li T 

PROVIDER: S-EPMC8549046 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature