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Ultra-broadband, fast, and polarization-sensitive photoresponse of low-symmetry 2D NdSb2

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Abstract

Broadband photodetectors with polarization-sensitive ability have received extraordinary attention for modern optoelectronic devices. Ideal photodetectors should possess high responsivity, fast response, and good stability, which are rare to meet at the same time in one low-symmetric two-dimentional (2D) material. In this work, neodymium diantimonides (NdSb2), a member of light rare-earth diantimonides RSb2 (R = La−Nd, Sm) with low-symmetry structure, is introduced as a fascinating highly anisotropic 2D material for broadband detection (532 nm to 4 µm). The photodetector exhibits a responsivity of 0.49 mA·W−1 with 15 µs response time at 532 nm and highly stable performance under ambient conditions over 8 months. Furthermore, we identify the polarization-sensitive photoresponse of the detector and demonstrate a high anisotropic factor ∼ 1.6. In addition, strong in-plane anisotropy is revealed by anisotropic phonon response and the photodetection mechanism is investigated by scanning photocurrent microscopy measurements. This pioneer work on NdSb2 paves the way for further exploration of 2D RSb2 for high performance polarized photodetectors with fast photothermoelectric response.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 51902001), the Recruitment Program for Leading Talent Team of Anhui Province (2019-16), the Natural Science Foundation of Anhui Province (No. 1908085QE17), and the Open Research Fund of Advanced Laser Technology Laboratory of Anhui Province (No. AHL2020KF02).

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Authors and Affiliations

  1. Institutes of Physical Science and Information Technology, Anhui University, Hefei, 230601, China

    Gang Li, Hanlin Zhang, Shiqi Yin, Binghui Ge, Chao An & Liang Li

  2. Engineering Technology Research Center of Magnetic Materials, School of Physics and Materials Science, Anhui University, Hefei, 230601, China

    Yong Li & Xucai Kan

  3. Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Science, Hefei, 230031, China

    Wensen Wei, Haifeng Du & Mingliang Tian

  4. Department of Applied Physics, The Hong Kong Polytechnic University, Kowloon, Hong Kong, 999077, China

    Feng Yan

  5. State Key Laboratory of Materials Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Wuhan, 430074, China

    Sanjun Yang & Tianyou Zhai

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  1. Gang Li
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Correspondence to Xucai Kan or Liang Li.

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Li, G., Zhang, H., Li, Y. et al. Ultra-broadband, fast, and polarization-sensitive photoresponse of low-symmetry 2D NdSb2. Nano Res. 15, 5469–5475 (2022). https://doi.org/10.1007/s12274-022-4156-2

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