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Composition-tunable ternary CdS1−xSex/graphene composites with enhanced photocurrent response

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Abstract

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.

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Acknowledgments

The work was supported by National Natural Science Foundation of China No. 51204129.

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Correspondence to Yun Lei.

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Lei, Y., He, Y. & Fang, C. Composition-tunable ternary CdS1−xSex/graphene composites with enhanced photocurrent response. J Mater Sci: Mater Electron 28, 878–883 (2017). https://doi.org/10.1007/s10854-016-5602-2

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  • DOI: https://doi.org/10.1007/s10854-016-5602-2

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