4.6 Article

Dual-Enhanced Photodetectors Combining Graphene Plasmonic Nanoresonators With Germanium-on-Insulator Optical Cavities

期刊

IEEE TRANSACTIONS ON ELECTRON DEVICES
卷 69, 期 6, 页码 3246-3250

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2022.3168528

关键词

3-D-graphene; germanium-on-insulator (GeOI); optical cavity; photodetectors; plasmonic nanoresonators

资金

  1. National Natural Science Foundation of China [62174093, 12075307]
  2. National Natural Science Foundation of Ningbo [202003N4097]
  3. Shanghai Rising-Star Program [21QA1410900]

向作者/读者索取更多资源

This study proposes a photodetector with increased light absorption efficiency by combining 3-D graphene with an optical cavity structure. The photodetectors exhibit excellent performance with multiple reflections and pave the way for high-performance graphene-based photodetectors with hybrid architectures.
Two-dimensional graphene (2-D graphene) has limited application potential in optoelectronics because of its low light absorptivity and gapless property. This work presents photodetectors with increased light absorption efficiency, which couple 3-D graphene with the optical cavity structure of germanium-on-insulator (GeOI). Multiple reflections are generated at the 3-D graphene/GeOI heterojunction due to the unique plasmonic nanoresonator and optical cavity structures. The photodetectors exhibit excellent responsivity (R = 0.9 x 10(4) mA W-1) and specific detectivity (D* = 3.96 x 10(10) cmHz(1/2)W(-1)) under 1550-nm illumination with fast response rates, excellent reproducibility, and long-term stability. The technique paves the way for creating novel high-performance graphene-based photodetectors with hybrid architectures.

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