期刊
SCIENCE
卷 360, 期 6390, 页码 778-782出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaq1479
关键词
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资金
- National Natural Science Foundation of China [51571007, 51772012, 11474176, 51602143, 11574128, 51788104]
- Beijing Municipal Science and Technology Commission [Z171100002017002]
- Shenzhen Peacock Plan team [KQTD2016022619565991]
- 111 Project [B17002]
- Presidential fund and Development and Reform Commission of Shenzhen Municipality
- Natural Science Foundation of Guangdong Province [2015A030308001]
- leading talents of Guangdong Province Program [00201517]
- Early Career Scheme of the Research Grants Council [27202516]
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 ZT. Here we show a maximum ZT of similar to 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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