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Modification of the intermediate band and thermoelectric properties in Se-doped CoSbS1?xSex compounds

机译:硒掺杂CoSbS 1? x Se x 化合物的中间带和热电性质的修饰

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Paracostibite (CoSbS), a naturally occurring mineral composed of earth abundant elements, is a newly developed and environmentally friendly thermoelectric material for medium temperature power generation applications, and has attracted considerable attention. In this work, in order to study the influence of Se doping on the site of S, CoSbS1?xSex (0 ≤ x ≤ 0.09) compounds were synthesized by vacuum melting and annealing and compacted by spark plasma sintering. Alloying S with Se decreased the band gap and the impurity activation energy. Moreover, Se substitution on the site of S not only improved the electronic transport properties, but it also dramatically suppressed the thermal conductivity. The maximum power factor as high as 1.1 × 10?3 Wm?1 K?2 was achieved in CoSbS0.99Se0.01 at 900 K. Due to the improved power factor and the decreased thermal conductivity, the ZT reached 0.26, exceeding the figure of merit of undoped CoSbS by about 37%.
机译:副肋高石(CoSbS)是一种由地球上丰富的元素组成的天然矿物,是一种新开发的,环境友好的热电材料,适用于中温发电应用,受到了广泛的关注。在这项工作中,为了研究硒掺杂对S的影响,CoSbS 1? x Se x (0≤ x ≤0.09)化合物是通过真空熔融和退火合成的,并通过火花等离子体烧结进行压实。 S与Se合金化降低了带隙和杂质活化能。此外,在S位点上的Se取代不仅改善了电子传输性能,而且还显着抑制了热导率。最大功率因数高达1.1×10 ?3 Wm ?1 K 在900 K的CoSbS 0.99 Se 0.01 中实现了?2 。为了提高功率因数并降低导热系数, ZT 达到0.26,比未掺杂CoSbS的品质因数高出约37%。

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