中国物理B ›› 2025, Vol. 34 ›› Issue (9): 97401-097401.doi: 10.1088/1674-1056/add907

所属专题: SPECIAL TOPIC — Heat conduction and its related interdisciplinary areas

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Charge doping induced thermal switches with a high switching ratio in monolayer MoS2

Chen Gui(桂琛), Zhi-Fu Duan(段志福), Chang-Hao Ding(丁长浩), Hao Chen(陈浩), Yuan Yao(姚远), Nan-Nan Luo(罗南南)†, Jiang Zeng(曾犟), Li-Ming Tang(唐黎明), and Ke-Qiu Chen(陈克求)‡   

  1. Department of Physics, School of Physics and Electronics, Hunan University, Changsha 410082, China
  • 收稿日期:2025-03-15 修回日期:2025-04-30 接受日期:2025-05-15 出版日期:2025-08-21 发布日期:2025-09-19
  • 通讯作者: Nan-Nan Luo, Ke-Qiu Chen E-mail:luonn@hnu.edu.cn;keqiuchen@hnu.edu.cn
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (Grant Nos. 12104145 and 12374040).

Charge doping induced thermal switches with a high switching ratio in monolayer MoS2

Chen Gui(桂琛), Zhi-Fu Duan(段志福), Chang-Hao Ding(丁长浩), Hao Chen(陈浩), Yuan Yao(姚远), Nan-Nan Luo(罗南南)†, Jiang Zeng(曾犟), Li-Ming Tang(唐黎明), and Ke-Qiu Chen(陈克求)‡   

  1. Department of Physics, School of Physics and Electronics, Hunan University, Changsha 410082, China
  • Received:2025-03-15 Revised:2025-04-30 Accepted:2025-05-15 Online:2025-08-21 Published:2025-09-19
  • Contact: Nan-Nan Luo, Ke-Qiu Chen E-mail:luonn@hnu.edu.cn;keqiuchen@hnu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Grant Nos. 12104145 and 12374040).

摘要: The thermal switch plays a crucial role in regulating system temperature, protecting devices from overheating, and improving energy efficiency. Achieving a high thermal switching ratio is essential for its practical application. In this study, by utilizing first-principles calculations and semi-classical Boltzmann transport theory, it is found that hole doping with an experimentally achievable concentration of $1.83 \times 10^{14}$ cm$^{-2}$ can reduce the lattice thermal conductivity of monolayer MoS$_2$ from 151.79 W$\cdot$m$^{-1}\cdot$K$^{-1}$ to 12.19 W$\cdot$m$^{-1}\cdot$K$^{-1}$, achieving a high thermal switching ratio of 12.5. The achieved switching ratio significantly surpasses previously reported values, including those achieved by extreme strain methods. This phenomenon mainly arises from the enhanced lattice anharmonicity, which is primarily contributed by the S atoms. These results indicate that hole doping is an effective method for tuning the lattice thermal conductivity of materials, and demonstrate that monolayer MoS$_2$ is a potential candidate material for thermal switches.

关键词: thermal switching ratio, thermal conductivity, anharmonicity, two-dimensional material

Abstract: The thermal switch plays a crucial role in regulating system temperature, protecting devices from overheating, and improving energy efficiency. Achieving a high thermal switching ratio is essential for its practical application. In this study, by utilizing first-principles calculations and semi-classical Boltzmann transport theory, it is found that hole doping with an experimentally achievable concentration of $1.83 \times 10^{14}$ cm$^{-2}$ can reduce the lattice thermal conductivity of monolayer MoS$_2$ from 151.79 W$\cdot$m$^{-1}\cdot$K$^{-1}$ to 12.19 W$\cdot$m$^{-1}\cdot$K$^{-1}$, achieving a high thermal switching ratio of 12.5. The achieved switching ratio significantly surpasses previously reported values, including those achieved by extreme strain methods. This phenomenon mainly arises from the enhanced lattice anharmonicity, which is primarily contributed by the S atoms. These results indicate that hole doping is an effective method for tuning the lattice thermal conductivity of materials, and demonstrate that monolayer MoS$_2$ is a potential candidate material for thermal switches.

Key words: thermal switching ratio, thermal conductivity, anharmonicity, two-dimensional material

中图分类号:  (Phonons)

  • 74.25.Kc
66.70.-f (Nonelectronic thermal conduction and heat-pulse propagation in solids;thermal waves) 65.80.-g (Thermal properties of small particles, nanocrystals, nanotubes, and other related systems) 74.25.fc (Electric and thermal conductivity)