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Bulk hetero-junction(BHJ)organic solar cells(OSCs)utilizing small molecules(SMs)as donor materials are under intensive investigation recently for their advantages of welldefined molecular structures,no end group contaminants,and good batch-to batch reproducibility.Among these developed SMs,star-shaped small molecules with a triphenylamine(TPA)core usually displayed strong absorption and high holes mobility,which is demonstrated to be the promising electron-donating materials [1-2].