Investigation of the Anisotropic Thermoelectric Properties of Oriented Polycrystalline SnSe

被引：112

作者：

Li, Yulong ^{[1
,2
,3
]}

Shi, Xun ^{[1
,2
]}

Ren, Dudi ^{[1
,2
]}

Chen, Jikun ^{[1
,2
]}

Chen, Lidong ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

[2] Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Mat Energy Convers, Shanghai 200050, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

ENERGIES | 2015年 / 8卷 / 07期

基金：

中国国家自然科学基金;

关键词：

thermoelectric; polycrystals; SnSe; anisotropy; PERFORMANCE; FIGURE; MERIT;

D O I：

10.3390/en8076275

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Polycrystalline SnSe was synthesized by a melting-annealing-sintering process. X-ray diffraction reveals the sample possesses pure phase and strong orientation along [h00] direction. The degree of the orientations was estimated and the anisotropic thermoelectric properties are characterized. The polycrystalline sample shows a low electrical conductivity and a positive and large Seebeck coefficient. The low thermal conductivity is also observed in polycrystalline sample, but slightly higher than that of single crystal. The minimum value of thermal conductivity was measured as 0.3 W/mK at 790 K. With the increase of the orientation factor, both electrical and thermal conductivities decrease, but the thermopowers are unchanged. As a consequence, the zT values remain unchanged in the polycrystalline samples despite the large variation in the degree of orientation.

引用

页码：6275 / 6285

页数：11

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