Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7993691 | Journal of Alloys and Compounds | 2018 | 32 Pages |
Abstract
SnSe-based thermoelectric materials have captured much attention since single-crystal SnSe exhibited record high ZT. However, the practical application is limited due to the poor mechanical properties and harsh production conditions of single crystals. Herein, we achieve high thermoelectric performances and enhanced mechanical properties in the Na-doped polycrystalline SnSe through implanting carbon nanotubes (CNTs). The CNTs are truncated and uniformly dispersed within the Na-doped SnSe matrix via a combination of cryogenic grinding and spark plasma sintering technique. It is found that Na-doped polycrystalline SnSe/CNTs composites maintain high carrier concentrations of approximately 4â¯Ãâ¯1019â¯cmâ3â¯at room temperature, resulting in great power factors. The dispersion of CNTs reduces the thermal conductivity without significant deterioration on the electrical conductivity. A maximum ZT of â¼0.96â¯at 773â¯K is achieved via adding merely 0.25â¯vol% CNTs. More fundamentally, the Na-doped polycrystalline SnSe samples incorporated with CNTs show superior mechanical properties, which are favorable for device fabrication and practical applications.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Fei Chu, Qihao Zhang, Zhenxing Zhou, Diankun Hou, Lianjun Wang, Wan Jiang,