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Organic solar cells (OSCs) have attracted great attention due to their advantages of light weight, low cost and flexible devices fabrication [1-3].Featuring a sandwitch structure, OSCs commonly adopt heterojunction blends of polymer donors and fullerene (or nonfullerene) based acceptors as light-absorbing layer.With the combinational efforts of materials development and device engineering/physics [4], OSCs have recently achieved power conversion efficiencies (PCEs) over 18％ in single-junction devices [1].