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Waveguide-integrated twisted bilayer graphene photodetectors.
Qinci Wu1,2, Jun Qian1,2, Yuechen Wang1,2,3
1Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, 100871, Beijing, P. R. China.
Nature Communications
|May 1, 2024
Summary
Researchers developed silicon photonics-integrated twisted bilayer graphene photodetectors with high responsivity (0.65 A/W) at 1550 nm. This breakthrough enables faster optical communication speeds exceeding 50 Gbit/s.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Graphene photodetectors offer high bandwidth and silicon photonics (SiPh) integration potential for optical communications.
- Low photoresponsivity due to weak optical absorption remains a key challenge for graphene photodetectors.
Purpose of the Study:
- To implement and characterize SiPh-integrated twisted bilayer graphene (tBLG) photodetectors.
- To enhance photoresponsivity for improved optical communication device performance.
Main Methods:
- Fabrication of SiPh-integrated tBLG photodetectors with a specific twist angle (4.1°).
- Measurement of photodetector responsivity at telecom wavelengths (1550 nm).
- Evaluation of device bandwidth and data stream rate.
Main Results:
- Achieved a responsivity of 0.65 A/W at 1550 nm.
- Demonstrated a 3-dB bandwidth exceeding 65 GHz and a data stream rate of 50 Gbit/s.
- Attributed high responsivity to enhanced optical absorption via van Hove singularities in tBLG.
Conclusions:
- SiPh-integrated tBLG photodetectors show high responsivity and bandwidth, suitable for optical communications.
- The enhanced absorption in tBLG, due to its band structure, is key to improved performance.
- Uniform performance of tBLG arrays suggests its potential for large-area heterogeneous integration with SiPh.
