Realizing Bi-doped α-Cu2Se as a promising near-room-temperature thermoelectric material

被引:48
作者
Liao, Wang-Wei [1 ]
Yang, Lei [1 ]
Chen, Jie [1 ]
Zhou, Da-Li [1 ]
Qu, Xian-lin [2 ]
Zheng, Kun [2 ]
Han, Guang [3 ]
Zhou, Jia-Bei [4 ]
Hong, Min [5 ]
Chen, Zhi-Gang [5 ,6 ]
机构
[1] Sichuan Univ, Sch Mat Sci & Engn, Chengdu 610064, Sichuan, Peoples R China
[2] Beijing Univ Technol, Inst Microstruct & Properties Adv Mat, Beijing 100022, Peoples R China
[3] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China
[4] Sichuan Univ, Sch Chem Engn, Chengdu 610064, Sichuan, Peoples R China
[5] Univ Southern Queensland, Ctr Future Mat, Springfield Cent, Qld 4300, Australia
[6] Univ Queensland, Mat Engn, St Lucia, Qld 4072, Australia
基金
澳大利亚研究理事会; 中国国家自然科学基金;
关键词
Thermoelectric; Copper selenide; alpha-Phase; Near-room-temperature; THERMAL-CONDUCTIVITY; PERFORMANCE; CU2SE; FIGURE; MERIT; EFFICIENCY;
D O I
10.1016/j.cej.2019.04.081
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Copper selenide (Cu2Se) has been extensively studied as an eco-friendly thermoelectric candidate owing to the outstanding thermoelectric performance of its high-temperature beta-phase. In this study, we propose that alpha-Cu2Se is also a promising thermoelectric material at near-room-temperature. We synthesize nanostructured Cu2-xSe via a facile solvothermal method, and densify the samples using Spark Plasma Sintering to maintain the small grain sizes. Although the as-prepared alpha-Cu2Se has intrinsically low lattice thermal conductivity, its high Cu deficiency leads to a high carrier concentration, therefore, a low thermoelectric performance. As an electron donor, bismuth can effectively compress the Cu vacancies of the as-prepared alpha-Cu2Se and in turn reduce its carrier concentration from 4.1 x 10(20) to 2.0 x 10(20) cm(-3) at room temperature, achieving a significantly enhanced power factor and a reduced carrier thermal conductivity. Consequently, a zT of 0.43 at 373 K is obtained in Cu1.982Bi0.006Se, showing great potential in developing high-performance near-room-temperature alpha-Cu2Se-based thermoelectric materials.
引用
收藏
页码:593 / 599
页数:7
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