▎ 摘　　要

CdS1-xSex/graphene composites were prepared by a solvothermal process using cadmium acetate as Cd precursors, sulfourea as S precursors and selenosulfate as Se precursors. The value of x could be adjusted by controlling the molar ratio of S and Se precursors, and the products were characterized by X-ray diffraction, scanning electron microscope and further evaluated by transient photocurrent responses and electrochemical impedance spectroscopy. Compared with pure CdS1-xSex, CdS1-xSex/graphene composites exhibit enhanced photocurrent response and decreased electron-transfer resistance due to the presence of graphene. The photocurrent of CdS1-xSex/graphene increases with the increase of the Se/S ratio and reaches the maximum at the Se/S ratio of 0.75: 0.25. The effect of graphene on the photocurrent response was explored and a higher photocurrent density can be observed for 1 % CdS1-xSex/graphene.