Journal
APPLIED SURFACE SCIENCE
Volume 596, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2022.153602
Keywords
Mg3Bi2 films; Metastable phase; Magnetron sputtering; Thermoelectric performance
Categories
Funding
- Zhejiang Provincial Natural Science Foundation of China [LY19E020009]
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In this study, Mg3Bi2 thin films were prepared at different temperatures using magnetron co-sputtering technique, and their microstructure and thermoelectric properties were investigated. It was found that the film undergoes a structural phase transition as the temperature increases, and different structural films exhibit different electrical properties. Among them, the textured hexagonal Mg3Bi2 thin film showed the highest power factor at 393K.
Mg3Bi2 has become a promising candidate for studying thermoelectric, Mg-ion batteries and novel topological properties. In this paper, the Mg3Bi2 thin films were deposited on glass substrates by magnetron co-sputtering under substrate temperatures ranging from 535 K to 595 K. A metastable cubic Mg3Bi2 that only existed under high temperatures and high pressures was observed in the Mg3Bi2 film deposited at Ts = 535 K. A structural phase transition occurs as Ts increases, and a textured hexagonal Mg3Bi2 film was obtained at Ts = 595 K. The microstructure and thermoelectric properties of cubic Mg3Bi2 and hexagonal Mg3Bi2 films were systematically investigated. The cubic Mg3Bi2 film exhibited n-type semiconductor behavior. However, the hexagonal Mg3Bi2 thin film possessed a positive Seebeck coefficient. A maximum power factor of 1.1 mu Wcm(-1)K(-2) was obtained in textured hexagonal Mg3Bi2 film at 393 K. Our results could pave the way toward the engineering phase of Mg3Bi2 film, which has potential applications in micro-energy harvesting devices.
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