Microstructure engineering beyond SnSe_1-xS_x solid solution for high thermoelectric performance(PDF)

Journal of Materiomics[ISSN:/CN:]

volumne:

Issue:

2018年04期

Page:

321-328

Research Field:

Publishing date:

2018-11-22

Info

Title:

Microstructure engineering beyond SnSe_1-xS_x solid solution for high thermoelectric performance

Highlights:

Miaomiao Li^a; b; Hezhu Shao^b; Jingtao Xu^b; Qingsong Wu^c; Xiaojian Tan^b; Guoqiang Liu^b; Min Jin^b; Haoyang Hu^b; Huajie Huang^a; Jianfeng Zhang^a; Jun Jiang

^aCollege of Mechanics and Materials, Hohai University, Nanjing 210098, China； ^bNingbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Science (CAS), Ningbo 315201, China； ^cLaboratory of Advanced Materials, Fudan University, Shanghai 200438, China

Keywords:

SnSe; Solid solution; Grain refinement; Thermal conductivity; Thermoelectric performance

PACS:

-

DOI:

https://doi.org/10.1016/j.jmat.2018.09.001

Abstract:

Recently, SnSe has attracted wide attention as a promising environment-friendly IV-VI thermoelectric material. Here, SnS is alloyed with Na-doped SnSe to decrease the thermal conductivity for better thermoelectric performance. Consistent with previous reports, the lattice constant and the band gap change linearly with increasing SnS, suggesting the formation of SnSe_1-xS_x solid solution. However, SnS nano-precipitations have been clearly observed, indicating the phase separation in the alloys. Moreover, the grain size decreases obviously with increasing SnS amount. The first-principles calculations show that the nano-precipitation is due to the positive formation energies for SnSe_1-xS_x in the small x region. Due to the structure engineering, the lattice thermal conductivity is greatly reduced in SnSe_1-xS_x samples, leading to a promising ZT of 1.35 for Na_0.03Sn_0.97Se_0.7S_0.3 at 816?K.

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