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Cd3As2 nanowires (NWs) have great potential in the near-infrared (NIR) photodetection field due to their excellent optoelectronic properties as a typical Dirac semimetal. However, the existence of surface oxidization limits their photoresponse performance for practical applications. Here, we modified the surface of Cd3As2 NWs with sulfur to prevent surface oxidizing and optimize the bandgap structure to improve the photoresponse performance. The S-modified Cd3As2 samples existed as core/shell Cd3As2/CdS NWs and the corresponding single NW device showed a responsivity of 0.95 A/W in the NIR band at a 0 V bias, which is three orders of magnitude higher than that of an unmodified NW. This study provides an efficient and universally applicable way to prevent semimetals nanostructures from oxidizing and promote their optoelectronic properties.


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Modify Cd3As2 nanowires with sulfur to fabricate self-powered NIR photodetectors with enhanced performance

Show Author's information Yongxu Yan1,2Wenhao Ran1,2Zhexin Li1,2Linlin Li1,2Zheng Lou1( )Guozhen Shen1,2( )
State Key Laboratory for Superlattices and Microstructures,Institute of Semiconductors, Chinese Academy of Sciences, ,Beijing,100083,China;
Center of Materials Science and Optoelectronic Engineering,University of Chinese Academy of Sciences,Beijing,100049,China;

Abstract

Cd3As2 nanowires (NWs) have great potential in the near-infrared (NIR) photodetection field due to their excellent optoelectronic properties as a typical Dirac semimetal. However, the existence of surface oxidization limits their photoresponse performance for practical applications. Here, we modified the surface of Cd3As2 NWs with sulfur to prevent surface oxidizing and optimize the bandgap structure to improve the photoresponse performance. The S-modified Cd3As2 samples existed as core/shell Cd3As2/CdS NWs and the corresponding single NW device showed a responsivity of 0.95 A/W in the NIR band at a 0 V bias, which is three orders of magnitude higher than that of an unmodified NW. This study provides an efficient and universally applicable way to prevent semimetals nanostructures from oxidizing and promote their optoelectronic properties.

Keywords: core-shell structure, nanowires, self-powered, near-infrared photodetector, Cd3As2

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Publication history
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Acknowledgements

Publication history

Received: 14 January 2021
Revised: 24 January 2021
Accepted: 27 January 2021
Published: 03 March 2021
Issue date: October 2021

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021

Acknowledgements

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 61874111, 61625404, 61888102, and 62022079) and the Youth Innovation Promotion Association of Chinese Academy of Sciences (No. 2020115).

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