Ternary organic solar cells based on polymer donor,polymer acceptor and PCBM components

In this work, ternary organic solar cells (OSCs) combining a fullerene derivative PC₇₁BM with a nonfullerene acceptor N2200-F blended with a polymer donor PM6 were reported. Compared with the binary systems, the highest power conversion efficiency (PCE) of 8.11% was achieved in ternary solar cells with 30 wt% N2200-F content, mainly due to the improved short-circuit current density (J_sc) and fill factor (FF). Further studies showed that the improved J_sc could attribute to the complementary absorption of the two acceptors and the enhanced FF was originated from the higher hole mobility and the fine-tuned morphology in the ternary system. These results demonstrate that the combination of fullerene and nonfullerene acceptors in ternary organic solar cells is a promising approach to achieve high-performance OSCs.