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Ternary organic solar cells(OSCs),which blend two donors and fullerene derivatives with different absorption ranges,are a promising potential strategy for high-power conversion efficiencies(PCEs).In this study,inverted ternary organic solar cells are fabricated by blending a highly crystalline small molecule BDT-3T-CNCOO in a low band gap polymer PBDTTT-C-T:PC71BM.As the small molecule is introduced,the overall PCEs increase from 7.60%to 8.58%.