Composition-tunable ternary CdS1−xSex/graphene composites with enhanced photocurrent response
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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.
KeywordsElectrochemical Impedance Spectroscopy Photocurrent Density Cadmium Acetate Photocurrent Response Graphene Content
The work was supported by National Natural Science Foundation of China No. 51204129.
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Conflict of interest
The authors declare that they have no conflict of interest to this work.