Wang Shaozhi, Yang Xiao, Hou Lingxiang, Cui Xueping, Zheng Xinghua, Zheng Jian
Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Nat Commun. 2022 Jul 29;13(1):4401. doi: 10.1038/s41467-022-32058-w.
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 TaS (SCCM-TaS) 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 and a power factor of 0.34 mW m K are obtained for a hybrid material of SCCM-TaS, with an in-plane thermal conductivity of 4.0 W m K, which is 7 times smaller than the thermal conductivity of the pristine TaS crystal. The power factor and low thermal conductivity contribute to a thermoelectric figure of merit (ZT) of ~0.04 at 443 K.
有机半导体因其分子多样性、无毒且易于加工，作为一种新型热电材料正吸引着广泛关注。通过共价修饰引入到二维（2D）过渡金属二硫属化物（TMDs）中的侧链会导致其热导率显著降低。在此，我们描述了一种制备侧链共价修饰TaS（SCCM-TaS）有机/无机杂化结构的简单方法，这是一种不依赖于缺陷和边界的均匀且无损的技术。对于SCCM-TaS杂化材料，获得了3401 S cm的电导率和0.34 mW m K的功率因子，其面内热导率为4.0 W m K，比原始TaS晶体的热导率小7倍。功率因子和低热导率使得在443 K时热电优值（ZT）约为0.04。
