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Zeng, Qingsheng; Zhao, Weiyun; Zhu, Chao; Chen, Yu; Cao, Xun; Yan, Qingyu; Long, Yi; Liu, Zheng; Sun, Bo; Du, Kezhao; Yu, Peng; Xia, Juan; Shen, Zexiang; Yu, Ting; Koh, Yee Kan, E-mail: mpekyk@nus.edu.sg, E-mail: z.liu@ntu.edu.sg2019
AbstractAbstract
[en] Black phosphorus captures enormous research attention on the anisotropic properties due to its orthorhombic crystal structure. Here the in-plane anisotropic thermoelectric behaviors of bulk black phosphorus crystals in the temperature range from 300 K to 600 K are reported for the first time. Based on the home-grown big size and high-quality black phosphorus crystals, the electrical conductivity and Seebeck coefficient are simultaneously measured by a ZEM-3 instrument system, and the thermal conductivity is measured by time-domain thermoreflectance (TDTR). For each individual parameter, the values along the zigzag and armchair directions show the same temperature-dependent trend. However, the electrical conductivity along the armchair direction is ∼ two times of that along the zigzag direction, while the thermal conductivity along the armchair direction is only ∼ one third of that along the zigzag direction. Furthermore, the Seebeck coefficients show almost isotropic behavior. As a result, the figure of merit ZT along the armchair direction is as large as ∼5.5 times of that along the zigzag direction, exhibiting high anisotropy. The results of intrinsic, orientation-dependent thermoelectric behaviors not only shed light on the fundamental physical properties of black phosphorus but also provide guidelines in the device design for potential thermoelectric applications. (paper)
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Source
Available from http://dx.doi.org/10.1088/2053-1583/ab2816; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
2D Materials; ISSN 2053-1583;
; v. 6(4); [8 p.]

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