Thermoelectric transport properties of pristine and Na-doped SnSe1-xTex polycrystals

被引：162

作者：

Wei, Tian-Ran ^{[1
]}

Wu, Chao-Feng ^{[1
]}

Zhang, Xiaozhi ^{[1
]}

Tan, Qing ^{[1
]}

Sun, Li ^{[1
]}

Pan, Yu ^{[1
]}

Li, Jing-Feng ^{[1
]}

机构：

[1] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2015年 / 17卷 / 44期

关键词：

LATTICE THERMAL-CONDUCTIVITY; PHASE-RELATIONS; PERFORMANCE; SNSE; EFFICIENCY; FIGURE; POWER; SYSTEMS; ALLOYS; MERIT;

D O I：

10.1039/c5cp05510e

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：

SnSe, a "simple" and "old" binary compound composed of earth-abundant elements, has been reported to exhibit a high thermoelectric performance in single crystals, which stimulated recent interest in its polycrystalline counterparts. This work investigated the electrical and thermal transport properties of pristine and Na-doped SnSe1-xTex polycrystals prepared by mechanical alloying and spark plasma sintering. It is revealed that SnSe1-xTex solid solutions are formed when x ranges from 0 to 0.2. An energy barrier scattering mechanism is suitable for understanding the electrical conducting behaviour observed in the present SnSe polycrystalline materials, which may be associated with abundant defects at grain boundaries. The thermal conductivity was greatly reduced upon Te substitution due to alloy scattering of phonons as well explained by the Debye model. Due to the increased carrier concentration by Na-doping, thermoelectric figure of merit (ZT) was enhanced in the whole temperature range with a maximum value of 0.72 obtained at a relatively low temperature (773 K) for Sn0.99Na0.01Se0.84Te0.16.

引用

页码：30102 / 30109

页数：8

共 58 条

[21] PHASE-RELATIONS IN SYSTEMS OF TIN CHALCOGENIDES [J].