Unusual consequences of donor and acceptor doping on the thermoelectric properties of the MgAg0.97Sb0.99 alloy

被引：7

作者：

Liu, Y. ^{[1
,2
,6
]}

Zhou, D. Z. ^{[3
]}

Li, Y. Q. ^{[3
]}

Hong, A. J. ^{[3
,4
]}

Sui, J. H. ^{[5
]}

Liu, J. M. ^{[3
]}

Ren, Z. F. ^{[1
,2
]}

机构：

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

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

[3] Nanjing Univ, Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[4] Jiangxi Normal Univ, Sch Phys Commun & Elect, Jiangxi Key Lab Nanomat & Sensors, Nanchang, Jiangxi, Peoples R China

[5] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin, Heilongjiang, Peoples R China

[6] Fresenius Kabi USA LLC, Melrose Pk, IL 60160 USA

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2018年 / 6卷 / 06期

基金：

中国国家自然科学基金;

关键词：

THERMAL-CONDUCTIVITY; HALF-HEUSLER; ALPHA-MGAGSB; RECENT PROGRESS; POWER-FACTOR; PERFORMANCE; SNSE; SKUTTERUDITES; GENERATION; CRYSTALS;

D O I：

10.1039/c7ta08657a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

MgAgSb alloys have been demonstrated to be one of the two best classes of low-temperature thermoelectric materials. In this study, a series of dopants to the slightly Ag- and Sb-deficient MgAg0.97Sb0.99 alloy are studied to explore their consequences on the power factor (PF) and thermoelectric figure-of-merit (ZT) of the alloy. The systematic study reveals that starting from the MgAg0.97Sb0.99 alloy, the donor dopant degrades both the PF and ZT, whereas the acceptor dopant enhances the PF without affecting the ZT. Both the donor and acceptor make the total thermal conductivity higher. A full-scale thermoelectric computation based on first-principles calculations and the Boltzmann transport theory is carried out to validate the experimental results. The calculated results for the donors and acceptors are semi-quantitatively consistent with our experimental results. The present study suggests that carrier doping alone may not be sufficient to significantly improve the overall thermoelectric performance of the MgAg0.97Sb0.99 alloy.

引用

页码：2600 / 2611

页数：12

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