Composition-tunable ternary CdS_1−xSe_x/graphene composites with enhanced photocurrent response

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• 作者：Yun Lei ; Yue He ; Chengyi Fang
• 刊名：Journal of Materials Science: Materials in Electronics
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：28
• 期：1
• 页码：878-883
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1573-482X
• 卷排序：28

文摘

CdS_1−xSe_x/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 CdS_1−xSe_x, CdS_1−xSe_x/graphene composites exhibit enhanced photocurrent response and decreased electron-transfer resistance due to the presence of graphene. The photocurrent of CdS_1−xSe_x/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 % CdS_1−xSe_x/graphene.