Fluorinated and methylated <i>ortho</i>-benzodipyrrole-based acceptors suppressing charge recombination and minimizing energy loss in organic photovoltaics.

ABSTRACT: The elimination of the A' unit from -type Y6-derivatives has led to the development of a new class of ortho-benzodipyrrole (o-BDP)-based A-D_NB_ND-A-type NFAs. In this work, two new A-D_NB_ND-A-type NFAs, denoted as CFB and CMB, are designed and synthesized, where electron-withdrawing fluorine atoms and electron-donating methyl groups are substituted on the benzene ring of the o-BDP moiety, respectively. CFB exhibits a blue-shifted absorption spectrum, stronger intermolecular interactions, shorter π-π stacking distances, and more ordered 3D intermolecular packing in the neat and blend films, enabling it to effectively suppress charge recombination in the PM6:CFB device showing a higher PCE of 16.55% with an FF of 77.45%. CMB disp

SUBMITTER: Wang YB 

PROVIDER: S-EPMC11744682 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature