期刊
INORGANIC CHEMISTRY COMMUNICATIONS
卷 153, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.inoche.2023.110790
关键词
SnTe; Sr -doping; Thermoelectric power factor; Thin film; Band engineering
Lead-free tin telluride (SnTe) thin films were systematically analyzed for their thermoelectric power factor through structural, morphological, and thermoelectric property measurements. The results showed that Sr-doping and post-annealing treatment can significantly enhance the thermoelectric properties by modifying band structure and introducing energy-filtering effect at grain boundaries. The highest power factor achieved was 29.4 mu Wm-1K- 2 at 523 K for Sn0.7Sr0.3Te thin films post-annealed at 1073 K, which was three times greater than that of pure SnTe.
Lead-free tin telluride (SnTe) has gained significant attention for its potential use in mid-temperature thermoelectric power generation. In this work, we systematically analyzed the thermoelectric power factor of Sn0.7Sr0.3Te thin films at various post-annealing temperatures through structural, morphological, and thermoelectric property measurements. Our findings show that Sr-doping in the SnTe thin film matrix and postannealing treatment can significantly enhance the thermoelectric properties by modifying the band structure and introducing an energy-filtering effect at grain boundaries. We achieved a maximum power factor of 29.4 mu Wm-1K- 2 at 523 K for Sn0.7Sr0.3Te thin films post-annealed at 1073 K, which is three times greater than that of pure SnTe. This work demonstrates that Sr-doping and post-annealing effects can tune the band gap, induce band degeneration, and reduce grain size, resulting in a high thermoelectric power factor of the SnTe thin film.
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