DataVXAdvanced MaterialsPaper
journal article·2019-02

In‐Plane Anisotropic Thermal Conductivity of Few‐Layered Transition Metal Dichalcogenide Td‐WTe2

Yu Chen, Bo Peng, Chunxiao Cong, Jingzhi Shang, Lishu Wu, Weihuang Yang, Jiadong Zhou, Peng Yu, Hongbo Zhang, Yanlong Wang, Chenji Zou, Jing Zhang, Sheng Liu, Qihua Xiong, Hezhu Shao, Zheng Liu, Hao Zhang, Wei Huang, Ting Yu

Advanced Materials· Volume 31· Issue 7
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Source abstract

Abstract

Abstract 2D Td‐WTe2 has attracted increasing attention due to its promising applications in spintronic, field‐effect chiral, and high‐efficiency thermoelectric devices. It is known that thermal conductivity plays a crucial role in condensed matter devices, especially in 2D systems where phonons, electrons, and magnons are highly confined and coupled. This work reports the first experimental evidence of in‐plane anisotropic thermal conductivities in suspended Td‐WTe2 samples of different thicknesses, and is also the first demonstration of such anisotropy in 2D transition metal dichalcogenides. The results reveal an obvious anisotropy in the thermal conductivities between the zigzag and armchair axes. The theoretical calculation implies that the in‐plane anisotropy is attributed to the different mean free paths along the two orientations. As thickness decreases, the phonon‐boundary scattering increases faster along the armchair direction, resulting in stronger anisotropy. The findings here are crucial for developing efficient thermal management schemes when engineering thermal‐related applications of a 2D system.
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Research context

OpenAlex topics: 2D Materials and Applications · Advanced Thermoelectric Materials and Devices · Thermal properties of materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Shaanxi Institute of Flexible Electronics (SIFE) Northwestern Polytechnical University (NPU) Xi'an 710129 China

Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore

Key Laboratory of Micro and Nano Photonic Structures (MOE) Department of Optical Science and Engineering Fudan University Shanghai 200433 China

State Key Laboratory of ASIC and System School of Information Science and Technology Fudan University Shanghai 200433 China

Key Laboratory of RF Circuits and System of Ministry of Education Hangzhou Dianzi University Hangzhou 310018 China

School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore

Key Laboratory of Chemical Lasers Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China

Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM) Nanjing Tech University (NanjingTech) Nanjing 211800 China

Funding

National Natural Science Foundation of China · Natural Science Foundation of Shanghai · National Foundation for Cancer Research · Natural Science Foundation of Jiangsu Province

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