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• W2971338315 abstract "Two-dimensional material van der Waals (vdW) heterostructures provide an excellent platform for design of novel optoelectronics. In this work, transition-metal dichalcogenide WS2 nanodiscs (WS2-NDs) of lateral dimension of 200-400 nm and layer number of 4-7 were synthesized on graphene using a layer-by-layer, transfer-free chemical vapor deposition. On this WS2-NDs/graphene vdW heterostructures, localized surface plasmonic resonance (LSPR) was achieved, resulting in remarkably enhanced light absorption as compared to the counterpart devices with a continuous WS2 layer (WS2-CL/graphene). Remarkably, the photoresponsivity of 6.4 A/W on the WS2-NDs/graphene photodetectors is seven times higher than that (0.91 A/W) of the WS2-CL/graphene vdW heterostructures at an incident 550 nm light intensity of 10 μW/cm2. Furthermore, the WS2-NDs/graphene photodetectors exhibit higher sensitivity to lower lights. Under 550 nm light illumination of 3 μW/cm2, which is beyond the sensitivity limit of the WS2-CL/graphene photodetectors, high photoresponsivity of 8.05 A/W and detectivity of 2.8 × 1010 Jones are achieved at Vsd = 5 V. This result demonstrates that the LSPR WS2-NDs/graphene vdW heterostructure is promising for scalable high-performance optoelectronics applications." @default.
• W2971338315 created "2019-09-05" @default.
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• W2971338315 date "2019-09-03" @default.
• W2971338315 modified "2023-10-14" @default.
• W2971338315 title "Plasmonic WS₂ Nanodiscs/Graphene van der Waals Heterostructure Photodetectors" @default.
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• W2971338315 doi "https://doi.org/10.1021/acsami.9b09262" @default.
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