Organic covalent modification to improve thermoelectric properties of TaS2

Shaozhi Wang, Xiao Yang, Lingxiang Hou, Xueping Cui (), Xinghua Zheng () and Jian Zheng ()
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Shaozhi Wang: Chinese Academy of Sciences
Xiao Yang: University of Chinese Academy of Sciences
Lingxiang Hou: Chinese Academy of Sciences
Xueping Cui: Chinese Academy of Sciences
Xinghua Zheng: University of Chinese Academy of Sciences
Jian Zheng: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-6

Abstract: Abstract Organic semiconductors are attracting considerable attention as a new thermoelectric material because of their molecular diversity, non-toxicity and easy processing. The side chains which are introduced into two-dimensional (2D) transition metal dichalcogenides (TMDs) by covalent modification lead to a significant decrease in their thermal conductivity. Here, we describe a simple approach to preparing the side chains covalent modification TaS2 (SCCM-TaS2) organic/inorganic hybrid structures, which is a homogeneous and non-destructive technique that does not depend on defects and boundaries. Electrical conductivity of 3,401 S cm−1 and a power factor of 0.34 mW m−1 K−2 are obtained for a hybrid material of SCCM-TaS2, with an in-plane thermal conductivity of 4.0 W m−1 K−1, which is 7 times smaller than the thermal conductivity of the pristine TaS2 crystal. The power factor and low thermal conductivity contribute to a thermoelectric figure of merit (ZT) of ~0.04 at 443 K.

Date: 2022
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DOI: 10.1038/s41467-022-32058-w

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