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Fabry–Perot Cavity-Enhanced Optical Absorption in Ultrasensitive Tunable Photodiodes Based on Hybrid 2D Materials
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    Fabry–Perot Cavity-Enhanced Optical Absorption in Ultrasensitive Tunable Photodiodes Based on Hybrid 2D Materials
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    Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
    Centre for Advanced 2D Materials, National University of Singapore, Block S14, 6 Science Drive 2, Singapore 117546, Singapore
    § Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
    SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
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    Nano Letters

    Cite this: Nano Lett. 2017, 17, 12, 7593–7598
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    https://doi.org/10.1021/acs.nanolett.7b03579
    Published November 8, 2017
    Copyright © 2017 American Chemical Society

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    Monolayer two-dimensional (2D) transition metal dichalcogenides (TMDs) show interesting optical and electrical properties because of their direct bandgap. However, the low absorption of atomically thin TMDs limits their applications. Here, we report enhanced absorption and optoelectronic properties of monolayer molybdenum disulfide (MoS2) by using an asymmetric Fabry–Perot cavity. The cavity is based on a hybrid structure of MoS2/ hexagonal boron nitride (BN)/Au/SiO2 realized through layer-by-layer vertical stacking. Photoluminescence (PL) intensity of monolayer MoS2 is enhanced over 2 orders of magnitude. Theoretical calculations show that the strong absorption of MoS2 comes from photonic localization on the top of the microcavity at optimal BN spacer thickness. The n/n+ MoS2 homojunction photodiode incorporating this asymmetric Fabry–Perot cavity exhibits excellent current rectifying behavior with an ideality factor of 1 and an ultrasensitive and gate-tunable external photo gain and specific detectivity. Our work offers an effective method to achieve uniform enhanced light absorption by monolayer TMDs, which has promising applications for highly sensitive optoelectronic devices.

    Copyright © 2017 American Chemical Society

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.nanolett.7b03579.

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    Nano Letters

    Cite this: Nano Lett. 2017, 17, 12, 7593–7598
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.nanolett.7b03579
    Published November 8, 2017
    Copyright © 2017 American Chemical Society

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