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首页> 外文期刊>Advanced Functional Materials >High Thermoelectric Performance in Supersaturated Solid Solutions and Nanostructured n-Type PbTe-GeTe
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High Thermoelectric Performance in Supersaturated Solid Solutions and Nanostructured n-Type PbTe-GeTe

机译：过饱和固溶体和纳米结构n型PbTe-GeTe中的高热电性能

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摘要

Sb-doped and GeTe-alloyed n-type thermoelectric materials that show an excellent figure of merit ZT in the intermediate temperature range (400-800 K) are reported. The synergistic effect of favorable changes to the band structure resulting in high Seebeck coefficient and enhanced phonon scattering by point defects and nanoscale precipitates resulting in reduction of thermal conductivity are demonstrated. The samples can be tuned as single-phase solid solution (SS) or two-phase system with nanoscale precipitates (Nano) based on the annealing processes. The GeTe alloying results in band structure modification by widening the bandgap and increasing the density-of-states effective mass of PbTe, resulting in significantly enhanced Seebeck coefficients. The nanoscale precipitates can improve the power factor in the low temperature range and further reduce the lattice thermal conductivity (kappa(lat)). Specifically, the Seebeck coefficient of Pb0.988Sb0.012Te-13%GeTe-Nano approaches -280 mu V K-1 at 673 K with a low kappa(lat) of 0.56 W m(-1) K-1 at 573 K. Consequently, a peak ZT value of 1.38 is achieved at 623 K. Moreover, a high average ZT(avg) value of approximate to 1.04 is obtained in the temperature range from 300 to 773 K for n-type Pb0.988Sb0.012Te-13%GeTe-Nano.
机译：据报道，在中间温度范围（400-800 K）内，具有优异性能因数ZT的掺Sb和GeTe合金n型热电材料。证明了能带结构发生有利变化的协同效应，导致了高塞贝克系数，并且由于点缺陷和纳米级析出物而导致声子散射增强，从而导致导热率降低。可以基于退火过程将样品调整为具有纳米级沉淀物（Nano）的单相固溶体（SS）或两相系统。 GeTe合金化通过扩大带隙并增加PbTe的态密度有效质量来改变能带结构，从而显着提高塞贝克系数。纳米级沉淀物可以提高低温范围内的功率因数，并进一步降低晶格热导率（kappa（lat））。具体来说，Pb0.988Sb0.012Te-13％GeTe-Nano的塞贝克系数在673 K时接近-280μV K-1，在573 K时的低kappa（lat）为0.56 W m（-1）K-1。因此，在623 K时达到的ZT峰值为1.38。此外，对于n型Pb0.988Sb0.012Te-13，在300至773 K的温度范围内，可以获得约1.04的高平均ZT（avg）值。 ％GeTe-Nano。

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