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Selectively enhanced photocurrent generation in twisted bilayer graphene with van Hove singularity

Author

Listed:
  • Jianbo Yin

    (Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University)

  • Huan Wang

    (Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University)

  • Han Peng

    (Clarendon Laboratory, University of Oxford)

  • Zhenjun Tan

    (Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University
    Academy for Advanced Interdisciplinary Studies, Peking University)

  • Lei Liao

    (Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University)

  • Li Lin

    (Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University)

  • Xiao Sun

    (Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University
    Academy for Advanced Interdisciplinary Studies, Peking University)

  • Ai Leen Koh

    (Stanford Nano Shared Facilities, Stanford University)

  • Yulin Chen

    (Clarendon Laboratory, University of Oxford)

  • Hailin Peng

    (Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University)

  • Zhongfan Liu

    (Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University)

Abstract

Graphene with ultra-high carrier mobility and ultra-short photoresponse time has shown remarkable potential in ultrafast photodetection. However, the broad and weak optical absorption (∼2.3%) of monolayer graphene hinders its practical application in photodetectors with high responsivity and selectivity. Here we demonstrate that twisted bilayer graphene, a stack of two graphene monolayers with an interlayer twist angle, exhibits a strong light–matter interaction and selectively enhanced photocurrent generation. Such enhancement is attributed to the emergence of unique twist-angle-dependent van Hove singularities, which are directly revealed by spatially resolved angle-resolved photoemission spectroscopy. When the energy interval between the van Hove singularities of the conduction and valance bands matches the energy of incident photons, the photocurrent generated can be significantly enhanced (up to ∼80 times with the integration of plasmonic structures in our devices). These results provide valuable insight for designing graphene photodetectors with enhanced sensitivity for variable wavelength.

Suggested Citation

  • Jianbo Yin & Huan Wang & Han Peng & Zhenjun Tan & Lei Liao & Li Lin & Xiao Sun & Ai Leen Koh & Yulin Chen & Hailin Peng & Zhongfan Liu, 2016. "Selectively enhanced photocurrent generation in twisted bilayer graphene with van Hove singularity," Nature Communications, Nature, vol. 7(1), pages 1-8, April.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms10699
    DOI: 10.1038/ncomms10699
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    Cited by:

    1. Qinci Wu & Jun Qian & Yuechen Wang & Luwen Xing & Ziyi Wei & Xin Gao & Yurui Li & Zhongfan Liu & Hongtao Liu & Haowen Shu & Jianbo Yin & Xingjun Wang & Hailin Peng, 2024. "Waveguide-integrated twisted bilayer graphene photodetectors," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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