Highly efficient ternary solar cells with reduced non-radiative energy loss and enhanced stability via two compatible non-fullerene acceptors

A non-fullerene small molecule acceptor MOIT-M was exploited for high-performance ternary OSCs. The PM6:BTP-eC9:MOIT-M (1 : 1.2 : 0.3, w/w) device achieved 18.5% efficiency, while the control binary PM6:BTP-eC9 device obtained a PCE of 17.4%.