In掺杂对p型Bi0.3Sb1.7Te3合金热电性能的影响  

Effect of In Doping on the Thermoelectric Properties of p-Type BiSbTe Alloy

作　　者：王小宇 李浩强[2] 杨双根 孙远涛[1] 向波[1,2] 朱彬 黄中月 祖方遒[2] WANG Xiao-yu;LI Hao-qiang;YANG Shuang-gen;SUN Yuan-tao;XIANG Bo;ZHU Bin;HUANG Zhong-yue;ZU Fang-qiu(38th Research Institute of China Electronic Science and Technology Group Co.,Ltd.,Hefei 230088,China;Liquid/Solid Metal Processing Institute,School of Materials Science&Engineering,Hefei University of Technology,Hefei 230009,China;Southern University of Science and Technology,Shenzhen 518055,China)

机构地区：[1]中国电子科技集团公司第38研究所,安徽合肥230088 [2]合肥工业大学材料科学与工程学院液/固金属加工研究所,安徽合肥230009 [3]南方科技大学,广东深圳518055

出　　处：《稀有金属与硬质合金》2020年第4期68-72,共5页Rare Metals and Cemented Carbides

基　　金：国家自然科学基金(5131073);安徽省自然科学基金(1808085ME108)。

摘　　要：以p型Bi0.3Sb1.7Te3合金为研究对象,探究In掺杂对其电声传输性能的影响。研究发现,随着In含量的增加,Seebeck系数上升,电导率降低,且当In含量为0.025时材料具有最优的PF,为37.02μW/(K^2·cm)。此外,In掺杂增加了材料中点缺陷的浓度和晶格畸变的程度,加强了对声子的散射,故材料热导率下降。因此,当In含量为0.050时,样品在401 K下有最优的ZT,为1.11。本文为提升p型Bi0.3Sb1.7Te3合金热电性能提供了一种行之有效的方法,增加了热电材料实际应用的潜力。Taking p-type Bi0.3Sb1.7Te3 alloy as the research object,the effect of In doping on its electron and phonon transport properties was investigated.The results show that with the increase of In content,Seebeck coefficient increases and the electrical conductivity decreases.When the In content is 0.025,the sample has the optimal power factor of 37.02 μW/(K^2·cm).Furthermore,the point defect concentration and lattice distortion degree of the material increase with In doping,which leads to the enhanced scattering of phonons and then the decreased thermal conductivity of the material.Consequently,the sample with In content of 0.050 has the optimal ZT of 1.11 at 401 K.This work provides an effective method to improve the thermoelectric properties of p-type Bi0.3Sb1.7Te3 alloy,and increases the applied potential of thermoelectric materials.

关 键 词：p型Bi0.3Sb1.7Te3合金 In掺杂 热电性能 

分 类 号：TB34[一般工业技术—材料科学与工程]