Thermoelectric performance improvement of p-type Mg3Sb2-based materials by Zn and Ag co-doping

被引：45

作者：

Huang, Lihong ^{[1
]}

Liu, Tong ^{[1
]}

Mo, Xiaobo ^{[1
]}

Yuan, Guocai ^{[1
]}

Wang, Runyu ^{[1
]}

Liu, Hang ^{[1
]}

Lei, Xiaobo ^{[1
]}

Zhang, Qinyong ^{[1
]}

Ren, Zhifeng ^{[2
,3
]}

机构：

[1] Xihua Univ, Sch Mat Sci & Engn, Key Lab Fluid & Power Machinery, Minist Educ, Chengdu 610039, Peoples R China

[2] Univ Houston, Dept Phys, Houston, TX 77204 USA

[3] Univ Houston, TcSUH, Houston, TX 77204 USA

来源：

MATERIALS TODAY PHYSICS | 2021年 / 21卷

基金：

中国国家自然科学基金;

关键词：

Mg3Sb2-Based materials; Zintl compound; Thermoelectric performance; Zn and Ag co-Doping; ZINTL PHASE-COMPOUNDS; SCATTERING; COMPOUND; CHEMISTRY; FIGURE;

D O I：

10.1016/j.mtphys.2021.100564

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Mg3Sb2-based Zintl compounds have attracted extensive attention as potential thermoelectric materials due to their earth-abundant elements. However, pure and intrinsic p-type Mg3Sb2 manifests a poor thermoelectric performance because of its high electrical resistivity. It is reported that Ag doping in Mg sites can increase the mobility and carrier concentration of p-type Mg3Sb2; however, high thermal conductivity still limits the improvement of the ZT value. In the present work, Zn and Ag co-doping in Mg sites was carried out to optimize the thermoelectric performance of p-type Mg3Sb2. Experimental results revealed that the carrier concentration and mobility of Mg3Ag0.01Sb2 significantly increased after Zn doping, leading to an improvement of the power factor. Simultaneously, lattice thermal conductivity was significantly reduced due to the large mass difference between Zn and Mg. The Mg2.39Zn0.6Ag0.01Sb2 sample with an optimal doping concentration of 3.95 x 10(19) cm(-3) achieved a maximum ZT value of 0.84 at 773 K. Hence, Zn and Ag co-doping is an effective method to improve the thermoelectric performance of p-type Mg3Sb2. (C) 2021 Elsevier Ltd. All rights reserved.

引用

页数：6

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