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首页> 外文期刊>Journal of Advanced Ceramics >Thermoelectric performance enhancement of (BiS)_(1.2)(TiS2)2 misfit layer sulfide by chromium doping
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Thermoelectric performance enhancement of (BiS)_(1.2)(TiS2)2 misfit layer sulfide by chromium doping

机译：铬掺杂增强（BiS）_（1.2）（TiS2）2失配层硫化物的热电性能

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摘要

A misfit layer sulfide (BiS)_(1.2)(TiS2)2 with a natural superlattice structure has been shown to be a promising thermoelectric material, but its high carrier concentration should be reduced so as to further optimize the thermoelectric performance. However, ordinary acceptor doping has not succeeded because of the non-parabolic band structure. In this paper, we have successfully doped chromium ions into the Ti sites, which can maintain or even enhance the high effective mass of electrons so as to effectively improve ZT value. X-ray diffraction analysis, coupled with X-ray photoelectron spectroscopy, shows that chromium has been substituted into titanium sites in TiS2 layers and confirms its ionic state. The chromium doping has successfully reduced the carrier concentration with the subsequent reduction of electrical conductivity. Unlike other acceptor dopants (alkaline earth metals), chromium also enhances Seebeck coefficient and the effective mass, which can possibly be attributed to the formation of additional resonant states near Fermi level. Though the power factor does not improve, the significant reduction in the electronic part of the thermal conductivity leads to a measurable improvement in ZT.
机译：具有自然超晶格结构的错配层硫化物（BiS）_（1.2）（TiS2）2已被证明是一种有前途的热电材料，但应降低其高载流子浓度以进一步优化热电性能。然而，由于非抛物线能带结构，普通的受主掺杂未能成功。在本文中，我们已经成功地将铬离子掺杂到Ti部位，可以保持甚至提高电子的有效质量，从而有效地提高ZT值。 X射线衍射分析和X射线光电子能谱分析表明，铬已被替换为TiS2层中的钛位，并证实了其离子态。铬掺杂已成功降低了载流子浓度，随后降低了电导率。与其他受体掺杂剂（碱土金属）不同，铬还增强了塞贝克系数和有效质量，这可能归因于在费米能级附近形成了其他共振态。尽管功率因数没有改善，但是热导率的电子部分的显着降低导致ZT的显着提高。

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