Journal
IEEE TRANSACTIONS ON ELECTRON DEVICES
Volume 69, Issue 6, Pages 3246-3250Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2022.3168528
Keywords
3-D-graphene; germanium-on-insulator (GeOI); optical cavity; photodetectors; plasmonic nanoresonators
Funding
- National Natural Science Foundation of China [62174093, 12075307]
- National Natural Science Foundation of Ningbo [202003N4097]
- Shanghai Rising-Star Program [21QA1410900]
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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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