无机材料学报 ›› 2019, Vol. 34 ›› Issue (3): 260-268.DOI: 10.15541/jim20180320

所属专题: 热电材料与器件

• 综述 • 上一篇    下一篇

热电材料中的晶格热导率

沈家骏, 方腾, 傅铁铮, 忻佳展, 赵新兵, 朱铁军   

  1. 浙江大学 材料科学与工程学院 硅材料国家重点实验室, 杭州 310027
  • 收稿日期:2018-07-16 修回日期:2018-09-03 出版日期:2019-03-20 发布日期:2019-02-26
  • 作者简介:沈家骏(1992-), 男, 博士研究生. E-mail: 11626058@zju.edu.cn
  • 基金资助:
    国家自然科学基金(51725102, 51761135127, 11574267)

Lattice Thermal Conductivity in Thermoelectric Materials

SHEN Jia-Jun, FANG Teng, FU Tie-Zheng, XIN Jia-Zhan, ZHAO Xin-Bing, ZHU Tie-Jun   

  1. State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;
  • Received:2018-07-16 Revised:2018-09-03 Online:2019-03-20 Published:2019-02-26
  • Supported by:
    National Natural Science Foundation of China(51725102, 51761135127, 11574267)

摘要:

随着可再生能源及能源转换技术的快速发展, 热电材料在发电及制冷领域的应用前景受到越来越广泛的关注。发展具有高热电优值材料的重要性日益突出, 如何获得低晶格热导率是热电材料的研究重点之一。本文阐述了热容、声速及弛豫时间对晶格热导率的影响, 介绍了本征低热导率热电材料所具有的典型特征, 如强非谐性、弱化学键、本征共振散射及复杂晶胞结构等, 并分析了通过多尺度声子散射降低已有热电材料晶格热导率的方法, 其中包括点缺陷散射、位错散射、晶界散射、共振散射、电声散射等多种散射机制。此外, 总结了几种预测材料最小晶格热导率的理论模型, 对快速筛选具有低晶格热导率的热电材料具有一定的理论指导意义。最后, 展望了如何获得低热导率热电材料的有效途径。

 

关键词: 热电材料, 晶格热导率, 热容, 弛豫时间, 综述

Abstract:

With rapid development of sustainable energies and energy conversion technologies, application prospect of thermoelectric (TE) materials in power generation and cooling has received increasing attention. The requirement of improving TE materials with high figure of merit becomes much more important. How to obtain the low lattice thermal conductivity is one of the main concerns in TE materials. In this review, the influences of specific heat, phonon group velocity and relaxation time on the lattice thermal conductivity are discussed, respectively. Several typical features of TE materials with intrinsic low lattice thermal conductivity are introduced, such as strong anharmonicity, weak chemical bonds and complex primitive cells. Introducing multiscale phonon scatterings to reduce the lattice thermal conductivity of known TE materials is also presented and discussed, including but not limited to point defect scattering, dislocation scattering, boundary scattering, resonance scattering and electron-phonon scattering. In addition, some theoretical models of the minimum lattice thermal conductivity are analyzed, which has certain theoretical significance for rapid screening of TE materials with low lattice thermal conductivity. Finally, the efficient ways to obtain the low lattice thermal conductivity for TE property optimization are proposed.

Key words: thermoelectric materials, lattice thermal conductivity, specific heat, relaxation time, review

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