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Chang, Cheng; Wu, Minghui; He, Dongsheng; Pei, Yanling; Wu, Chao-Feng; Wu, Xuefeng; Yu, Hulei; Zhu, Fangyuan; Wang, Kedong; Chen, Yue; Huang, Li; Li, Jing-Feng; He, Jiaqing; Zhao, Li-Dong
Science (American Association for the Advancement of Science), 2018-May-18, 2018-05-18, 20180518, Letnik: 360, Številka: 6390Journal Article
Thermoelectric technology enables the harvest of waste heat and its direct conversion into electricity. The conversion efficiency is determined by the materials figure of merit Here we show a maximum of ~2.8 ± 0.5 at 773 kelvin in n-type tin selenide (SnSe) crystals out of plane. The thermal conductivity in layered SnSe crystals is the lowest in the out-of-plane direction two-dimensional (2D) phonon transport. We doped SnSe with bromine to make n-type SnSe crystals with the overlapping interlayer charge density (3D charge transport). A continuous phase transition increases the symmetry and diverges two converged conduction bands. These two factors improve carrier mobility, while preserving a large Seebeck coefficient. Our findings can be applied in 2D layered materials and provide a new strategy to enhance out-of-plane electrical transport properties without degrading thermal properties.
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