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	Enhancing the Thermoelectric Performance of p-Type Mg3Sb2 via Codoping of Li and Cd
	Tang, Xiaodan3; Zhang, Bin4; Zhang, Xiao4; Wang, Shuxia3; Lu, Xu3; Han, Guang1; Wang, Guoyu2; Zhou, Xiaoyuan3,4
	2020-02-19
摘要	The Zintl compound Mg3Sb2 is a promising thermoelectric material with Earth-abundant components. Compared to its n-type counterpart, p-type Mg3Sb2 reveals lower dimensionless figure of merit (zT), principally due to the inferior electronic properties. Herein, p-type Mg3Sb2 materials codoped with Li and Cd have been synthesized via a ball milling plus hot pressing method, and their thermoelectric properties are systematically investigated within the temperature range 300-773 K. Li is found to be an effective hole dopant, which leads to a zT of 0.46 at 773 K in Mg2.99Li0.01Sb2 that doubles the zT of Mg3Sb2. Additional Cd doping further increases carrier mobility ascribed to the weakened polar covalent bonding and diminishes the lattice thermal conductivity simultaneously due to the introduced atomic mass contrast between Cd and Mg. Eventually, the optimized power factor combined with the reduced thermal conductivity has significantly improved the thermoelectric performance of p-type Mg3Sb2, with Mg(2.69)Li(0.01)Cd(0.5S)b(2) achieving a maximum zT of similar to 0.68 at 773 K and an average zT(ave) of similar to 0.32 over 300-773 K that compare very favorably to those of pristine Mg3Sb2. This study demonstrates that (Li, Cd) codoping is an effective strategy to enhance the thermoelectric properties of p-type Mg3Sb2 materials.
关键词	p-type Mg3Sb2 (Li, Cd) codoping carrier mobility thermal conductivity thermoelectric
DOI	10.1021/acsami.9b23059
发表期刊	ACS APPLIED MATERIALS & INTERFACES
ISSN	1944-8244
卷号	12期号:7页码:8359-8365
通讯作者	Han, Guang(guang.han@cqu.edu.cn) ; Wang, Guoyu(guoyuw@cigit.ac.cn) ; Zhou, Xiaoyuan(xiaoyuan2013@cqu.edu.cn)
收录类别	SCI
WOS记录号	WOS:000515214300054
语种	英语