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Simultaneous optimization of phononic and electronic transport in two-dimensional Bi2O2Se by defect engineering

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  • Special Topic: Two-dimensional Materials and Device Applications
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Abstract

Defect engineering represents one degree of freedom to tune the physical and chemical properties of two-dimensional (2D) materials. Here, we demonstrate that the thermal and electronic properties of 2D Bi2O2Se can be optimized simultaneously by introducing oxygen defects. 2D Bi2O2Se and its oxygen-deficient counterpart (Bi2OxSe, x < 2) can be controllably synthesized by the chemical vapor deposition (CVD) method. By introducing oxygen defects, the thermal conductivity of 2D Bi2O2Se is reduced by nearly three times, achieving an extremely low thermal conductivity of 0.68 ± 0.06 W/mK at room temperature via the thermal bridge technique. This low thermal conductivity is enabled by the scattering of phonons by targeting of high-, mid-, and low-frequency phonons due to oxygen defects, strong anharmonicity, and nanostructure boundaries, respectively. Meanwhile, the mobility is also improved to 260–500 cm2·V−1·s−1 and the usual polar optical phonon scattering in 2D Bi2O2Se is weakened owing to the introduction of oxygen defects. Our results promise potential applications for thermoelectric design, nanoelectronics, and thermal barrier coating devices based on emerging 2D materials.

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Acknowledgements

This work was supported by National Key Research and Development Program of China (Grant Nos. 2019YFA0208000, 2021YFA1200700) and National Natural Science Foundation of China (Grant Nos. 62174026, 91963130).

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Authors and Affiliations

  1. School of Physics, Southeast University, Nanjing, 211189, China

    Fang Yang & Junpeng Lu

  2. Institute of Materials Research and Engineering, Agency for Science, Technology and Research, Singapore, 138634, Singapore

    Hong Kuan Ng & Jing Wu

  3. NNU-SULI Thermal Energy Research Center (NSTER) & Center for Quantum Transport and Thermal Energy Science (CQTES), School of Physics and Technology, Nanjing Normal University, Nanjing, 210023, China

    Yunshan Zhao

Authors
  1. Fang Yang
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  2. Hong Kuan Ng
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  3. Jing Wu
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  4. Yunshan Zhao
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  5. Junpeng Lu
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Correspondence to Yunshan Zhao or Junpeng Lu.

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Yang, F., Ng, H.K., Wu, J. et al. Simultaneous optimization of phononic and electronic transport in two-dimensional Bi2O2Se by defect engineering. Sci. China Inf. Sci. 66, 160408 (2023). https://doi.org/10.1007/s11432-023-3758-4

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  • DOI: https://doi.org/10.1007/s11432-023-3758-4

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