Ternary blend polymer solar cells with two non-fullerene acceptors as acceptor alloy

Abstract Two small-molecule non-fullerene acceptors, TPE-4PDI and SF-4PDI, and one polymer donor PTB7-Th are selected to construct ternary polymer solar cells with electron-cascade energy levels. In this novel combination, TPE-4PDI is employed as the third component to tune the morphology, achieve balanced hole/electron mobilities, enhance the exciton separation and improve the FF and J sc . Hence, the best efficiency of the ternary organic solar cells increase by ∼20% compared with the binary system.