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Research Article

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

Gang Li1, Hanlin Zhang1, Yong Li2, Shiqi Yin1, Xucai Kan2( ), Wensen Wei3, Haifeng Du3, Binghui Ge1, Chao An1, Mingliang Tian3, Feng Yan4, Sanjun Yang5, Tianyou Zhai5, Liang Li1( )
Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
Engineering Technology Research Center of Magnetic Materials, School of Physics and Materials Science, Anhui University, Hefei 230601, China
Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Science, Hefei 230031, China
Department of Applied Physics, The Hong Kong Polytechnic University, Kowloon, Hong Kong 999077, China
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
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Graphical Abstract

Robust anisotropic phonon and photoresponse were demonstrated in NdSb2, and thephotothermoelectric effect was confirmed by scanning photocurrent microscopy measurements.Realizing a fast response with 15 µs and an ideal responsivity of 0.49 mA·W−1 and the self-poweredability shows no obvious deviation when operated after 8 months.

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.

Keywords

ultra-broadbandfast responsepolarization-sensitive photodetectorNdSb2

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Nano Research
Volume 15 Issue 6,
June 2022
Pages 5469-5475
DOI: 10.1007/s12274-022-4156-2
Cite this article:
Li G, Zhang H, Li Y, et al. Ultra-broadband, fast, and polarization-sensitive photoresponse of low-symmetry 2D NdSb2. Nano Research, 2022, 15(6): 5469-5475. https://doi.org/10.1007/s12274-022-4156-2
Topics:
Photodetectors

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Received: 28 October 2021
Revised: 22 December 2021
Accepted: 12 January 2022
Published: 10 March 2022
© Tsinghua University Press 2022
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