Waveguide-integrated twisted bilayer graphene photodetectors

Qinci Wu, Jun Qian, Yuechen Wang, Luwen Xing, Ziyi Wei, Xin Gao, Yurui Li, Zhongfan Liu, Hongtao Liu, Haowen Shu, Jianbo Yin (), Xingjun Wang () and Hailin Peng ()
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Qinci Wu: Peking University
Jun Qian: Peking University
Yuechen Wang: Peking University
Luwen Xing: Peking University
Ziyi Wei: Peking University
Xin Gao: Peking University
Yurui Li: Beijing Graphene Institute
Zhongfan Liu: Peking University
Hongtao Liu: Peking University
Haowen Shu: Peking University
Jianbo Yin: Beijing Graphene Institute
Xingjun Wang: Peking University
Hailin Peng: Peking University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-47925-x

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