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Unusually efficient photocurrent extraction in monolayer van der Waals heterostructure by tunnelling through discretized barriers

Author

Listed:
  • Woo Jong Yu

    (University of California
    Sungkyunkwan University
    Samsung-SKKU Graphene Center (SSGC))

  • Quoc An Vu

    (Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS)
    Sungkyunkwan University
    Sungkyunkwan University)

  • Hyemin Oh

    (Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS)
    Sungkyunkwan University)

  • Hong Gi Nam

    (Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS)
    Sungkyunkwan University)

  • Hailong Zhou

    (University of California)

  • Soonyoung Cha

    (School of Electrical and Electronic Engineering, Yonsei University)

  • Joo-Youn Kim

    (School of Electrical and Electronic Engineering, Yonsei University)

  • Alexandra Carvalho

    (Centre for Advanced 2D Materials, National University of Singapore)

  • Munseok Jeong

    (Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS)
    Sungkyunkwan University)

  • Hyunyong Choi

    (School of Electrical and Electronic Engineering, Yonsei University)

  • A. H. Castro Neto

    (Centre for Advanced 2D Materials, National University of Singapore)

  • Young Hee Lee

    (Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS)
    Sungkyunkwan University
    Sungkyunkwan University)

  • Xiangfeng Duan

    (University of California
    California Nanosystems Institute, University of California)

Abstract

Two-dimensional layered transition-metal dichalcogenides have attracted considerable interest for their unique layer-number-dependent properties. In particular, vertical integration of these two-dimensional crystals to form van der Waals heterostructures can open up a new dimension for the design of functional electronic and optoelectronic devices. Here we report the layer-number-dependent photocurrent generation in graphene/MoS2/graphene heterostructures by creating a device with two distinct regions containing one-layer and seven-layer MoS2 to exclude other extrinsic factors. Photoresponse studies reveal that photoresponsivity in one-layer MoS2 is surprisingly higher than that in seven-layer MoS2 by seven times. Spectral-dependent studies further show that the internal quantum efficiency in one-layer MoS2 can reach a maximum of 65%, far higher than the 7% in seven-layer MoS2. Our theoretical modelling shows that asymmetric potential barriers in the top and bottom interfaces of the graphene/one-layer MoS2/graphene heterojunction enable asymmetric carrier tunnelling, to generate usually high photoresponsivity in one-layer MoS2 device.

Suggested Citation

  • Woo Jong Yu & Quoc An Vu & Hyemin Oh & Hong Gi Nam & Hailong Zhou & Soonyoung Cha & Joo-Youn Kim & Alexandra Carvalho & Munseok Jeong & Hyunyong Choi & A. H. Castro Neto & Young Hee Lee & Xiangfeng Du, 2016. "Unusually efficient photocurrent extraction in monolayer van der Waals heterostructure by tunnelling through discretized barriers," Nature Communications, Nature, vol. 7(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13278
    DOI: 10.1038/ncomms13278
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