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A series of organic solar cells (OSCs) are prepared with PTB7:PC71BM as the host materials and DIB-SQ as the third component.The power conversion efficienty (PCE) of OSCs can be improved from 6.79％ to 7.92％ by incorporating 6 wt％DIB-SQ into donors,resulting from the enhanced short circuit current density (Jsc) and fill factor (FF).The increased Jsc of the optimized teary OSCs should be attributed to the enhanced photon harvesting of teranry active layer by incorporating DIB-SQ.Meanwhile,FF of the optimized teary OSCs should be due to the optimied phase separation.The open circuit voltage (Voc) of tenray OSCs can be maintained at a constant of 0.75 V,indicating that all photogenerated holes willl be transported along the channels formed by PTB7.