Journal
ADVANCED OPTICAL MATERIALS
Volume 10, Issue 23, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202201443
Keywords
mid-infrared photonics; tellurium; van der Waals materials; waveguide-integrated photodetector
Categories
Funding
- National Natural Science Foundation of China [61975179, 91950204, 92150302, 12104375]
- National Key Research and Development Program of China [2019YFB2203002]
- Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang [2020R01005]
- Open Fund of the State Key Laboratory of Integrated Optoelectronics [IOSKL2020KF05]
- Fundamental Research Funds for the Central Universities [2021QNA5007]
- State Key Laboratory of Advanced Optical Communication Systems and Networks [2022GZKF005]
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Mid-infrared (MIR) waveguide-integrated photodetectors are crucial for sensing and optical communications. This study successfully developed an integrated Te photodetector with enhanced light-matter interaction and reduced carrier transit time using high-quality Te nanosheets, which exhibit a narrow bandgap, high carrier mobility, and great air stability.
Mid-infrared (MIR) waveguide-integrated photodetector is essential for various applications in the fields of sensing and optical communications. However, it is challenging to integrate traditional MIR photoactive materials such as HgCdTe or III-V compounds with complementary metal-oxide-semiconductor (CMOS)-compatible silicon platform due to the lattice mismatch. Tellurium (Te), a novel van der Waals (vdW) material with a narrow bandgap, high carrier mobility, and great air stability, is a promising candidate for high-performance MIR detection. Here, high-quality Te nanosheets are synthesized using a hydrothermal method and their carrier dynamics are characterized by transient reflection spectrum. The effect of mobility anisotropy on response speed is investigated intuitively by a free space phototransistor. Combining the strong evanescent wave of a waveguide architecture with the synergy effect between the carrier collection path and the highest mobility crystal orientation in Te, an integrated Te photodetector with enhanced light-matter interaction and reduced carrier transit time is achieved. For the first time, the MIR waveguide-integrated Te photodetector with a responsivity of 2.3 A W-1 and a bandwidth of 4 GHz at 2015 nm is realized, which is the highest speed MIR photodetector based on narrow bandgap vdW materials to date.
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