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Waveguide-integrated twisted bilayer graphene photodetectors

Author

Listed:
  • Qinci Wu

    (Peking University
    Beijing Graphene Institute)

  • Jun Qian

    (Peking University
    Beijing Graphene Institute)

  • Yuechen Wang

    (Peking University
    Beijing Graphene Institute
    Peking University)

  • Luwen Xing

    (Peking University
    Peking University)

  • Ziyi Wei

    (Peking University)

  • Xin Gao

    (Peking University
    Beijing Graphene Institute
    Peking University)

  • Yurui Li

    (Beijing Graphene Institute
    Peking University)

  • Zhongfan Liu

    (Peking University
    Beijing Graphene Institute
    Peking University)

  • Hongtao Liu

    (Peking University)

  • Haowen Shu

    (Peking University)

  • Jianbo Yin

    (Beijing Graphene Institute
    Peking University
    Peking University)

  • Xingjun Wang

    (Peking University)

  • Hailin Peng

    (Peking University
    Beijing Graphene Institute
    Peking University)

Abstract

Graphene photodetectors have exhibited high bandwidth and capability of being integrated with silicon photonics (SiPh), holding promise for future optical communication devices. However, they usually suffer from a low photoresponsivity due to weak optical absorption. In this work, we have implemented SiPh-integrated twisted bilayer graphene (tBLG) detectors and reported a responsivity of 0.65 A W–1 for telecom wavelength 1,550 nm. The high responsivity enables a 3-dB bandwidth of >65 GHz and a high data stream rate of 50 Gbit s–1. Such high responsivity is attributed to the enhanced optical absorption, which is facilitated by van Hove singularities in the band structure of high-mobility tBLG with 4.1o twist angle. The uniform performance of the fabricated photodetector arrays demonstrates a fascinating prospect of large-area tBLG as a material candidate for heterogeneous integration with SiPh.

Suggested Citation

  • 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.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47925-x
    DOI: 10.1038/s41467-024-47925-x
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    References listed on IDEAS

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