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Tuning the electric transport behavior of AgCrSe2 by intrinsic defects

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Abstract

The two-dimensional (2D) structure often leads to unusual phenomena for the impact of confined mean free path of carrier scattering. As a quasi-2D layered material, AgCrSe2 has a liquid-like phonon behavior for its unstable Ag atoms at service temperature, leading to the promising candidate for thermoelectricity and fast ionic conductor. However, the inferior electronic performance constrains its application prospects as a functional semiconductor, which provides broad opportunity to tune its electric behaviors by defect chemistry. In this work, we revealed abundant electric transport behaviors of AgCrSe2 with different types of intrinsic defects. For example, the AgCrSe2 changes from Anderson insulator to metal when Se defects become prevailing and the magnetoresistance alters its sign depending on the relative ratio of Ag and Cr defects. Our results reported here can give salutary boosting on regulating the electric properties of ternary transition metal selenide by defect chemistry.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (U1832142), the National Key R&D Program of China (2018YFB0703602), the Youth Innovation Promotion Association CAS (Y202092), the Fundamental Research Funds for the Central University (WK2340000094), China Postdoctoral Science Foundation (2019TQ0293, 2020M671868), and the National Synchrotron Radiation Laboratory Joint funds of University of Science and Technology of China (KY2340000114).

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China

    Yang Hua, Wei Bai & Chong Xiao

  2. Institute of Energy, Hefei Comprehensive National Science Center, Hefei, 230031, China

    Chong Xiao

  3. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230029, China

    Sheng Wang, Yunbo Wu, Shengtao Cui & Zhe Sun

Authors
  1. Yang Hua
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  2. Wei Bai
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  3. Sheng Wang
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  4. Yunbo Wu
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  5. Shengtao Cui
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  6. Zhe Sun
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  7. Chong Xiao
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Correspondence to Chong Xiao.

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Hua, Y., Bai, W., Wang, S. et al. Tuning the electric transport behavior of AgCrSe2 by intrinsic defects. Sci. China Chem. 64, 1970–1975 (2021). https://doi.org/10.1007/s11426-021-1071-4

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  • DOI: https://doi.org/10.1007/s11426-021-1071-4

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