Enhanced Thermoelectric Properties of Polycrystalline SnSe via LaCl3 Doping

被引：32

作者：

Li, Fu ^{[1
,2
]}

Wang, Wenting ^{[1
]}

Ge, Zhen-Hua ^{[1
,3
]}

Zheng, Zhuanghao ^{[1
]}

Luo, Jingting ^{[1
]}

Fan, Ping ^{[1
]}

Li, Bo ^{[3
]}

机构：

[1] Shenzhen Univ, Coll Phys & Energy, Shenzhen Key Lab Adv Thin Films & Applicat, Shenzhen 518060, Peoples R China

[2] Tsinghua Univ, Grad Sch Shenzhen, Adv Mat Inst, Shenzhen 518055, Peoples R China

[3] Kunming Univ Sci & Technol, Fac Mat Sci & Engn, Kunming 650093, Yunnan, Peoples R China

来源：

MATERIALS | 2018年 / 11卷 / 02期

关键词：

thermoelectric material; SnSe; electrical conductivity; thermal conductivity; THERMAL-CONDUCTIVITY; PERFORMANCE; FIGURE; MERIT; POWER;

D O I：

10.3390/ma11020203

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：

LaCl3 doped polycrystalline SnSe was synthesized by combining mechanical alloying (MA) process with spark plasma sintering (SPS). It is found that the electrical conductivity is enhanced after doping due to the increased carrier concentration and carrier mobility, resulting in optimization of the power factor at 750 K combing with a large Seebeck coefficient over 300 Mvk(-1). Meanwhile, all the samples exhibit lower thermal conductivity below 1.0 W/mK in the whole measured temperature. The lattice thermal conductivity for the doped samples was reduced, which effectively suppressed the increscent of the total thermal conductivity because of the improved electrical conductivity. As a result, a ZT value of 0.55 has been achieved for the composition of SnSe-1.0 wt % LaCl3 at 750 K, which is nearly four times higher than the undoped one and reveals that rare earth element is an effective dopant for optimization of the thermoelectric properties of SnSe.

引用

页数：10

共 31 条

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