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Roles of Cu in the enhanced thermoelectric properties in Bi0.5Sb1.5Te3
Hao, Feng1,2; Qiu, Pengfei1; Song, Qingfeng1,2; Chen, Hongyi1; Lu, Ping1; Ren, Dudi1; Shi, Xun1; Chen, Lidong1
2017
发表期刊Materials
卷号10期号:3
摘要Recently, Cu-containing p-type Bi0.5Sb1.5Te3materials have shown high thermoelectric performances and promising prospects for practical application in low-grade waste heat recovery. However, the position of Cu in Bi0.5Sb1.5Te3is controversial, and the roles of Cu in the enhancement of thermoelectric performance are still not clear. In this study, via defects analysis and stability test, the possibility of Cu intercalation in p-type Bi0.5Sb1.5Te3materials has been excluded, and the position of Cu is identified as doping at the Sb sites. Additionally, the effects of Cu dopants on the electrical and thermal transport properties have been systematically investigated. Besides introducing additional holes, Cu dopants can also significantly enhance the carrier mobility by decreasing the Debye screen length and weakening the interaction between carriers and phonons. Meanwhile, the Cu dopants interrupt the periodicity of lattice vibration and bring stronger anharmonicity, leading to extremely low lattice thermal conductivity. Combining the suppression on the intrinsic excitation, a high thermoelectric performance-with a maximum thermoelectric figure of merit of around 1.4 at 430 K-has been achieved in Cu0.005Bi0.5Sb1.495Te3, which is 70% higher than the Bi0.5Sb1.5Te3matrix. © 2017 by the authors.
DOI10.3390/ma10030251
EI入藏号20171103448755
EI主题词Bismuth compounds
EI分类号525.3 Energy Utilization - 525.4 Energy Losses (industrial and residential) - 544.1 Copper - 615.4 Thermoelectric Energy - 641.1 Thermodynamics - 701.1 Electricity: Basic Concepts and Phenomena - 933.1.1 Crystal Lattice - 951 Materials Science
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文献类型期刊论文
条目标识符http://ir.sic.ac.cn/handle/331005/25505
专题中国科学院上海硅酸盐研究所
作者单位1.State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai; 200050, China;
2.University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing; 100049, China
推荐引用方式
GB/T 7714
Hao, Feng,Qiu, Pengfei,Song, Qingfeng,et al. Roles of Cu in the enhanced thermoelectric properties in Bi0.5Sb1.5Te3[J]. Materials,2017,10(3).
APA Hao, Feng.,Qiu, Pengfei.,Song, Qingfeng.,Chen, Hongyi.,Lu, Ping.,...&Chen, Lidong.(2017).Roles of Cu in the enhanced thermoelectric properties in Bi0.5Sb1.5Te3.Materials,10(3).
MLA Hao, Feng,et al."Roles of Cu in the enhanced thermoelectric properties in Bi0.5Sb1.5Te3".Materials 10.3(2017).
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