Enhanced photoresponse of tungsten disulfide-reduced graphene oxide hybrid for photoelectrochemical photodetectors
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In this report, WS2-reduced graphene oxide (WS2-rGO) hybrid was successfully synthesized through a hydrothermal reduction process in which WS2 nanosheets (WS2 NSs) were prepared by a lithium-ion intercalation and exfoliation technique. The photodetection properties of as-synthesized samples have been systematically investigated using a photoelectrochemical (PEC) system, which presents a reproducible photoresponse of WS2-rGO under zero bias, indicating that such hybrid is a promising photoanode for self-powered photodetectors. At a bias of 0.8 V, the photocurrent density of WS2-rGO hybrid was 4.32 μA/cm2, which is approximately 800% of that of the bare WS2 photodetector. Meanwhile, the photoresponsivity of as-prepared WS2-rGO hybrid increases linearly with the irradiation intensity, up to 9.3 μA/W at power density of 30 mW/cm2. In addition, the stability test exhibits no conspicuous degradation after 100 cycles. The enhanced performance of the WS2-rGO hybrid benefits from the high carrier mobility of rGO and the efficient separation of photogenerated carriers at the WS2-rGO interface. This research demonstrates that the WS2-rGO hybrid has a good prospect in PEC-type photodetectors.
This work was supported by the Grants from National Natural Science Foundation of China (No. 11504312), Scientific Research Fund of Hunan Provincial Education Department (No. 18A059), Open Fund based on innovation platform of Hunan colleges and universities (No. 18K032), Provincial Natural Science Foundation of Hunan (No. 2019JJ50612), the Program for Changjiang Scholars and Innovative Research Team in University (IRT_17R91) and Science and Technology Program of Xiangtan (No. CXY-ZD20172002).
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Conflicts of interest
There are no conflicts of interest to declare.
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