Enhanced mid-temperature thermoelectric performance of textured SnSe polycrystals made of solvothermally synthesized powders

Li, Yiwen1; Li, Fu1; Dong, Jinfeng2; Ge, Zhenhua3; Kang, Feiyu1; He, Jiaqing3; Du, Hongda1; Li, Bo1; Li, Jing-Feng1,2

2016

10.1039/c5tc04202j

Journal of Materials Chemistry C   影响因子和分区

2050-7526

2050-7534

This work revealed that the thermoelectric properties of textured SnSe polycrystals, which are made of solvothermally synthesized powders with a preferred orientation grown along the (400) plane, can be enhanced, especially in the range of mid-temperatures. The electrical conductivity for the sintered sample is greatly improved in the whole measured temperature range, attributed to the high carrier concentration and unique mobility change. This results in a large power factor combined with the moderate Seebeck coefficient, especially in the range of 300-650 K, which exceeds 5 mu W cm(-1) K-2 at 423 K and even larger than 6 mu W cm(-1) K-2 at 521 K. Benefiting from the enhanced electrical conductivity and the low total thermal conductivity (<1 W m(-1) K-1 in the range of 300 to 773 K), a higher ZT value than that reported for undoped single crystals was achieved in a relatively wide mid-temperature range, which reached 0.44 at 522 K and 0.5 at 573 K, and then showed weak temperature dependence in the range from 573 to 700 K. Above 700 K, the ZT value increased with temperature and a maximum value of nearly 0.6 was obtained at the maximum measured temperature of 773 K for the SnSe sample without any deliberate doping.

SCI ; EI

英语

其他

China Postdoctoral Science Foundation[2013M540091]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied

WOS:000371671400016

ROYAL SOC CHEMISTRY

20161102093564

Carrier concentration ; Doping (additives) ; Electric conductivity ; Layered semiconductors ; Polycrystals ; Powders ; Selenium compounds ; Single crystals ; Temperature distribution ; Thermal conductivity ; Thermoelectricity

Thermodynamics:641.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Crystalline Solids:933.1

Web of Science

1.Tsinghua Univ, Grad Sch Shenzhen, Adv Mat Inst, Shenzhen 518055, Peoples R China
2.Tsinghua Univ, Sch Mat Sci & Engn, Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
3.South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China

Li, Yiwen,Li, Fu,Dong, Jinfeng,et al. Enhanced mid-temperature thermoelectric performance of textured SnSe polycrystals made of solvothermally synthesized powders[J]. Journal of Materials Chemistry C,2016,4(10):2047-2055.

Li, Yiwen.,Li, Fu.,Dong, Jinfeng.,Ge, Zhenhua.,Kang, Feiyu.,...&Li, Jing-Feng.(2016).Enhanced mid-temperature thermoelectric performance of textured SnSe polycrystals made of solvothermally synthesized powders.Journal of Materials Chemistry C,4(10),2047-2055.

Li, Yiwen,et al."Enhanced mid-temperature thermoelectric performance of textured SnSe polycrystals made of solvothermally synthesized powders".Journal of Materials Chemistry C 4.10(2016):2047-2055.