Bi_(2)Te_(3)基热电材料中的声子工程  

Phonon Engineering in Bi_(2)Te_(3)-Based Thermoelectric Materials

作　　者：刘志愿 管希成 李周[3] 马妮 马俊杰 巴倩 夏爱林[1] 晋传贵[1] LIU Zhiyuan;GUAN Xicheng;LI Zhou;MA Ni;MA Junjie;BA Qian;XIA Ailin;JIN Chuangui(School of Materials Science and Engineering,Anhui University of Technology,Ma'anshan 243002,Anhui,China;Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,Anhui University of Technology,Ma'anshan 243002,Anhui,China;School of Materials Science and Engineering,Anhui University,Hefei 230601,China;School of Chemistry and Materials Science,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002 [2]安徽工业大学先进金属材料绿色制备与表面技术教育部重点实验室,安徽马鞍山243002 [3]安徽大学材料科学与工程学院,合肥230601 [4]中国科学技术大学化学与材料科学学院,合肥230026

出　　处：《硅酸盐学报》2024年第1期203-217,共15页Journal of The Chinese Ceramic Society

基　　金：安徽省优秀青年项目(2208085Y17);安徽省高校协同创新项目(GXXT-2022-008);国家自然科学基金(51872006)。

摘　　要：Bi_(2)Te_(3)基合金因其优异的电输运性能和较低热导率在低温区热电材料中备受关注。然而由Bi_(2)Te_(3)基合金制造的热电发电或制冷器件转化效率仍较低,因此进一步提升Bi_(2)Te_(3)基材料的热电优值zT是关键。由于晶格热导率与电性能参数关联较少,在热电性能参数中较为独立,因此,在不影响电性能的前提下,通过声子工程降低晶格热导率成为提升zT值的重要方法。本文主要综述了近年来通过纳米改性、超晶格结构、纳米复合、掺杂和引入位错阵列等声子工程优化Bi_(2)Te_(3)基材料热电性能的主要研究进展。通过这些优化手段可以显著降低材料的比热容、声子群速度或声子平均自由程,Bi_(2)Te_(3)基材料的晶格热导率显著降低,热电性能大幅提升,为热电器件的应用提供科学和技术支撑。Bi_(2)Te_(3) based alloys have attracted considerable attention in low-temperature thermoelectric materials due to their superior electrical transport properties and low thermal conductivity.However,the conversion efficiency of thermoelectric power generation or refrigeration devices made of Bi_(2)Te_(3)-based alloys is still low.It is thus crucial to further improve the thermoelectric figure of merit z T of Bi_(2)Te_(3) based materials.There are some correlations between lattice thermal conductivity and electrical performance parameter.Reducing the lattice thermal conductivity by phonon engineering becomes an important method to increase z T without deteriorating the electrical performance.This review summarized the main research progress in recent years to optimize the thermoelectric properties of Bi_(2)Te_(3) based materials by phonon engineering,such as nano-modification,superlattice structure,nanocomposing,doping and adding dislocation arrays.The effect of the optimization method on the specific heat capacity,phonon group velocity and phonon mean free path was discussed.The specific heat capacity,phonon group velocity or phonon mean free path of Bi_(2)Te_(3) based materials can be significantly reduced by the optimization methods.As a result,the lattice thermal conductivity of Bi_(2)Te_(3) based materials is significantly reduced,leading to a significant increase in the thermoelectric properties.Nano-modification:The interface density is increased via low dimensionalization and grain refinement,resulting in an enhanced scattering of low-frequency phonons,reduced phonon mean free path and phonon group velocity,significantly reducing the lattice thermal conductivity.Nowadays,the grain size and morphology of Bi_(2)Te_(3)-based alloys can be precisely controlled by mechanical milling,MBE method,hydrothermal method,chemical vapour deposition and wet chemical method.Bi_(2)Te_(3) nanostructures with a ultra-low grain size can be prepared.However,heat conduction cannot be completely prevented even at rather small si

关 键 词：碲化铋基热电材料 声子工程 晶格热导率 热电性能 

分 类 号：TG132.24[一般工业技术—材料科学与工程]