Over 14% efficiency for ternary organic solar cell with 300 nm thick active layer

A thick-film (300 nm) ternary OSC is fabricated by introducing phenyl-C61-butyric-acid-methyl ester (PC61BM) into a PBDB-T-2Cl:BTP-4F host blend, as these materials present complementary absorption and well-matched energy levels. By delicately optimizing the blend film morphology and improving the charge carrier mobility, over 14.3% efficiency was achieved for the device based on PBDB-T-2Cl:BTP-4F:PC61BM.