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- Title
Widely tunable black phosphorus mid-infrared photodetector.
- Authors
Xiaolong Chen; Bingchen Deng; Yuchuan Shao; Cheng Li; Shaofan Yuan; Fengnian Xia; Xiaobo Lu; Vy Tran; Li Yang; Ofer Sinai; Naveh, Doron; Watanabe, Kenji; Takashi Taniguchi
- Abstract
Lately rediscovered orthorhombic black phosphorus (BP) exhibits promising properties for near- and mid-infrared optoelectronics. Although recent electrical measurements indicate that a vertical electric field can effectively reduce its transport bandgap, the impact of the electric field on light-matter interaction remains unclear. Here we show that a vertical electric field can dynamically extend the photoresponse in a 5 nm-thick BP photodetector from 3.7 to beyond 7.7 μm, leveraging the Stark effect. We further demonstrate that such a widely tunable BP photodetector exhibits a peak extrinsic photo-responsivity of 518, 30, and 2.2 mA W-1 at 3.4, 5, and 7.7 μm, respectively, at 77 K. Furthermore, the extracted photo-carrier lifetime indicates a potential operational speed of 1.3 GHz. Our work not only demonstrates the potential of BP as an alternative mid-infrared material with broad optical tunability but also may enable the compact, integrated on-chip high-speed mid-infrared photodetectors, modulators, and spectrometers.
- Subjects
PHOSPHORUS; OPTOELECTRONICS; SEMICONDUCTORS; PHOTODETECTORS; THERMAL properties
- Publication
Nature Communications, 2017, Vol 8, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-017-01978-3