Tuning conjugated chain ends in small molecular acceptors for enhancing molecular packing in binary blend acceptors and inducing high efficiency in planar junction organic photovoltaics

PM6/L8-BO:Y5-IC-TT devices achieve 19.3% PCE (17.4% for PM6/L8-BO). Y5-IC-TT's small dihedral angles induce large blend binding energies in parallel/antiparallel orientations, resulting in a larger packing coherence length.