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Enhancing thermoelectric performance of n-type PbSe via additional meso-scale phonon scattering

机译：通过额外的中间级声子散射提高N型PBSE的热电性能

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摘要

The study of the lead chalcogenides system has been extended throughout the history of thermoelectrics due to their extraordinary physical and chemical properties. Compared with PbTe, PbSe has been drawing increased attention because it combines several attractive features, such as higher melting point, lower cost, and higher operation temperatures. The all-scale hierarchical structures were successfully applied to p-type PbSe systems, and a fascinating ZT value was achieved by effectively reducing the lattice thermal conductivity, which could be attributed to phonon scattering with a spectrum of wavelengths. However, the lattice thermal conductivity also reached about 1.0 W m~(-1) K~(-1) in the n-type PbSe system, which is very high compared with p-type PbSe that has been reported. In this study, by means of introducing mesostructures, the lattice thermal conductivity was efficaciously lowered from ～1.3 W m~(-1) K~(-1) to ～1.2 W m~(-1) K~(-1) at room temperature and ～0.9 W m~(-1) K~(-1) to ～0.6 W m~(-1) K~(-1) at 923 K for the n-type PbSe-PbS system. Correspondingly, a marked increase in ZT value from ～1.3 to ～1.5 at 923 K was observed, which indicated that the applications with superior conversion efficiencies on a large scale could be achieved from systems consisting of abundant and inexpensive chemical elements.
机译：由于其非凡的物理和化学性质，在整个热电历史上延伸了对铅硫属元素体系的研究。与PBTE相比，PBSE一直在绘制更多的注意力，因为它结合了几个有吸引力的特征，例如更高的熔点，更低的成本和更高的操作温度。通过有效地降低晶格导热率来实现全级分层结构，通过有效地降低晶格导热率来实现迷人的ZT值。然而，在N型PBSE系统中，晶格导热率也达到约1.0Wm〜（-1）K〜（-1），与已经报道的p型PBSE相比非常高。在本研究中，通过引入介质结构，晶格导热率从〜1.3WM〜（-1）K〜（-1）〜1.2W m〜（-1）K〜（-1）为N型PBSE-PBS系统，室温和〜0.9 W m〜（-1）K〜（-1）至〜0.6 W m〜（-1）k〜（-1）。相应地，观察到从〜1.3至〜1.5的ZT值的显着增加，这表明，具有卓越的转换效率的应用可以从由丰富和廉价的化学元素组成的系统实现。

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  • 来源
    《Inorganic Chemistry Frontiers》 |2017年第4期|共8页
  • 作者

    Xin Qian; Lei Zheng; Yu Xiao;

  • 作者单位

    School of Materials Science and Engineering Beihang University Beijing 100191 China.;

    School of Materials Science and Engineering Beihang University Beijing 100191 China.;

    School of Materials Science and Engineering Beihang University Beijing 100191 China.;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无机化学;
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