Journal
ENERGY TECHNOLOGY
Volume 7, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.201900814
Keywords
anisotropy; bismuth telluride; hot-pressing textures; orientations; thermoelectric materials
Categories
Funding
- National Science Foundation of China [51702334, 21875273, 51872301]
- Natural Science Foundation of Zhejiang Province [LY18E020017, LY18A040008]
- Zhejiang Provincial Science Fund for Distinguished Young Scholars [LR16E020001]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences [2018337, 2019298]
- Chinese Academy of Sciences President's International Fellowship Initiative Grant [2018VEA0008]
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Bi2Te3-based materials possess excellent thermoelectric (TE) properties near room temperature. The microstructure's orientations of these materials have a great influence on their properties owing to the lamellar structure. Herein, a process for the preparation of bismuth telluride, named hot-pressing texture (HPT) where the hot-pressed (HP) samples are preformed by powder molding, leads to the fine alignment of grains. The orientation factor of the HPT sample is improved by 20%, compared with that of the HP sample. After further carrier concentration optimization, the improved ZT of 1.1 at 350 K is achieved, with an average ZT of 0.9 between 300 and 500 K. Herein, it is shown that the proposed preparation process is an effective strategy for the fabrication of layered materials.
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