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The high thermoelectric performance of slightly Sb doped PbTe alloys
Journal of Materials Chemistry C ( IF 6.4 ) Pub Date : 2019/12/30 , DOI: 10.1039/c9tc06124j
Tingting Chen 1, 2, 3, 4, 5 , Kaiqi Zhang 1, 2, 3, 4, 5 , Hongchao Wang 1, 2, 3, 4, 5 , Wenbin Su 1, 2, 3, 4, 5 , Fahad Mehmood 1, 2, 3, 4, 5 , Teng Wang 1, 2, 3, 4, 5 , Jinze Zhai 1, 2, 3, 4, 5 , Xue Wang 1, 2, 3, 4, 5 , Taichang Huo 1, 2, 3, 4, 5 , Chunlei Wang 1, 2, 3, 4, 5
Affiliation  

Simple chemical compositions are more suitable for practical applications of thermoelectric materials due to the high success rates of their syntheses and their higher stabilities. Here, n-type PbTe alloys doped with a small amount of Sb were synthesized, and the effects of slight doping on the thermoelectric properties were investigated. All samples have single-phase microstructures, uniform composition distributions, and non-uniform grain sizes on the micro- and nano-scales. A higher power factor of 22.5 μW K−2 cm−1 has been obtained for the composition Pb0.995Sb0.005Te, which was attributed to a reduction in resistivity and to the preservation of a relatively high Seebeck coefficient though tuning the carrier concentrations. In addition, the highly heterogeneous grain size distribution strengthens the grain boundary scattering, and the Sb doped and Te vacancies result in an enhancement in point defect scattering. These two main factors lead to a lower lattice thermal conductivity of 0.68 W m−1 K−1 for the Pb0.988Sb0.012Te alloy at 723 K. In the end, a maximum zT value of about 1.1 has been achieved for the Pb0.995Sb0.005Te alloy, which is comparable to that of Sb doped PbTe alloys with a high doping concentration.

中文翻译:

轻掺杂Sb的PbTe合金的高热电性能

简单的化学组成因其合成成功率高和稳定性高而更适合热电材料的实际应用。在此,合成了掺有少量Sb的n型PbTe合金,并研究了轻度掺杂对热电性能的影响。所有样品均具有单相微观结构,均匀的成分分布以及微米和纳米级的不均匀晶粒尺寸。对于成分Pb 0.995 Sb 0.005,已获得22.5μWK -2 cm -1的更高功率因数Te,这归因于电阻率的降低和通过调整载流子浓度而保持了较高的塞贝克系数。另外,高度不均匀的晶粒尺寸分布增强了晶界散射,并且Sb掺杂和Te空位导致点缺陷散射增强。这两个主要因素导致在723 K时Pb 0.988 Sb 0.012 Te合金的晶格热导率较低,为0.68 W m -1 K -1。最后,Pb 0.995的最大zT值达到了约1.1 Sb 0.005 Te合金,与具有高掺杂浓度的Sb掺杂PbTe合金相当。
更新日期:2020-02-12
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