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Anisotropic in-plane thermal conductivity for multi-layer WTe2

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Abstract

Improving thermal transport between substrate and transistors has become a vital solution to the thermal challenge in nanoelectronics. Recently 2D WTe2 has sparked extensive interest because of heavy atomic mass and low Debye temperature. Here, the thermal transport of supported WTe2 was studied via Raman thermometry with electrical heating. The supported 30 nm WTe2 encased with 70 nm Al2O3 delivered 4.8 W·m−1·K−1 in-plane thermal conductivity along zigzag direction at room temperature, which was almost 1.6 times larger than that along armchair direction (3.0 W·m−1·K−1). Interestingly, the superior and inferior directions for thermal transport are just opposite of those for electrical transport. Hence, a heat manipulation model in WTe2 FET device was proposed. Within the designed configuration, waste heat in WTe2 would be mostly dissipated to metal contacts located along zigzag, relieving the local temperature discrepancy in the channel effectively and preventing degradation or breakdown. Our study provides new insight into thermal transport of anisotropic 2D materials, which might inspire energy-efficient nanodevices in the future.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 61801498, 11404399, 11874423, and 51701237), the National Defense Science and Technology Innovation Zone, the Scientific Researches Foundation of National University of Defense Technology (Nos. ZK18-01-03, ZK18-03-36, ZK20-16, and ZZKY-YX-08-06), the China Postdoctoral Science Foundation (CPSF) (No. 2019M663569), and the Youth Talent Lifting Project (No. 17-JCJQ-QT-004).

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  1. Yuehua Wei and Chuyun Deng contributed equally to this work.

Authors and Affiliations

  1. College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China

    Yuehua Wei, Xiangzhe Zhang, Renyan Zhang & Shiqiao Qin

  2. College of Arts and Sciences, National University of Defense Technology, Changsha, 410073, China

    Chuyun Deng, Wei Luo, Yi Zhang & Gang Peng

  3. College of Physical Science and Technology, Xiamen University, Xiamen, 361005, China

    Xiaoming Zheng, Yangbo Chen, Weiwei Cai & Xueao Zhang

  4. Hunan Key Laboratory of Super-microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha, 410083, China

    Jinxin Liu & Han Huang

  5. Chongqing 2D Materials Institute, Liangjiang New Area, Chongqing, 400714, China

    Weiwei Cai & Qi Ge

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  1. Yuehua Wei
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Correspondence to Renyan Zhang, Xueao Zhang or Shiqiao Qin.

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Wei, Y., Deng, C., Zheng, X. et al. Anisotropic in-plane thermal conductivity for multi-layer WTe2. Nano Res. 15, 401–407 (2022). https://doi.org/10.1007/s12274-021-3492-y

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  • DOI: https://doi.org/10.1007/s12274-021-3492-y

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