High thermoelectric performance of melt-spun CuXBi0.5Sb1.5Te3 by synergetic effect of carrier tuning and phonon engineering

被引:40
作者
Yoon, Jeong Seop [1 ]
Song, Jae Min [1 ]
Rahman, Jamil Ur [1 ]
Lee, Soonil [2 ]
Seo, Won Seon [1 ]
Lee, Kyu Hyoung [3 ]
Kim, Seyun [4 ]
Kim, Hyun-Sik [5 ]
Kim, Sang-il [6 ]
Shin, Weon Ho [1 ]
机构
[1] Korea Inst Ceram Engn & Technol, Energy & Environm Div, 101 Soho Ro, Jinju Si 52851, Gyeongsangnam D, South Korea
[2] Changwon Natl Univ, Sch Mat Sci & Engn, 20 Changwondaehak Ro, Changwon Si 51140, Gyeongsangnam D, South Korea
[3] Yonsei Univ, Dept Mat Sci & Engn, 50 Yonsei Ro, Seoul 24341, South Korea
[4] Samsung Adv Inst Technol, Mat Res Ctr, 130 Samsung Ro, Suwon 16678, Gyeonggi Do, South Korea
[5] Hongik Univ, Dept Mat Sci & Engn, Seoul 04066, South Korea
[6] Univ Seoul, Dept Mat Sci & Engn, Seoul 02504, South Korea
基金
新加坡国家研究基金会;
关键词
Thermoelectric; Melt spinning; Carrier tuning; Phonon engineering; LATTICE THERMAL-CONDUCTIVITY; BISMUTH-ANTIMONY-TELLURIDE; TRANSPORT-PROPERTIES; ALLOYS; FIGURE; MERIT; ENHANCEMENT; TEXTURE;
D O I
10.1016/j.actamat.2018.07.067
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Bi-Te based materials have been used for near-room-temperature thermoelectric applications. However, their properties dramatically decrease at high temperatures (over 100 degrees C), limiting their use in power generation. In this study, we investigated the enhanced thermoelectric properties of Bi-Te based materials by Cu doping and employing the melt-spinning (MS) process that can be utilized especially at elevated temperatures. By changing the doping amount, we could modulate the temperature dependence of thermoelectric properties, where the maximum ZT temperature could be shifted from room temperature to 450 K. The highest ZT value, 1.34, was achieved at 400 K for 2% Cu-doped Bi0.5Sb1.5Te3, which is due to the enhancement in power factor and reduction in lattice thermal conductivity. The average ZT value between room temperature and 530 K was 1.17 for 2% Cu-doped Bi0.5Sb1.5Te3, which is 46% higher than that of pristine Bi0.5Sb1.5Te3. Consequently, the synergetic effect of MS process and Cu incorporation can be a promising method to widen the application of Bi-Te based thermoelectric materials for mid-temperature power generation. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:289 / 296
页数:8
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