| Probing the thermoelectric transport properties of n-type Bi2Te3 close to the limit of constitutional undercooling |
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| 作者姓名： | 冯松科 李双明 傅恒志 |
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| 作者单位： | State Key Laboratory of Solidification Processing Northwestern Polytechnical University |
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| 摘 要： | Bulk n-type Bi2Te3 single crystals with optimized chemical composition were successfully prepared by a high temperature-gradient directional solidification method. We investigate the influence of alloy microstructure, chemical composition, and growth orientation on the thermoelectric transport properties. The results show that the composition of single-crystal Bi2Te3 alloy, along the c axis direction, could be slightly tuned by changing the growth rate of the crystal. At a rate of 18 mm/h, the formed Bi2Te3 crystal exhibits good thermoelectric properties. At 300 K, a maximum Seebeck coefficient of -245 μV/K and an electrical conductivity of 5.6 × 10 4 S/m are acquired. The optimal power factor is ob- tained as 3.3 × 10 -3 W/K2m, with a figure of merit of 0.74. It can be attributed to the increased tellurium allocation in the Bi2Te3 alloys, as verified well by the density functional theory caLculations.
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| 关 键 词： | Bi2Te3 热电特性 传输性能 成分过冷 n型 极限 探测 密度泛函理论 |
Probing the thermoelectric transport properties of n-type Bi2Te3 close to the limit of constitutional undercooling |
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| Affiliation: | State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China |
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| Abstract: | thermoelectric property, directional solidification, Bi2Te3, density functional theory |
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| Keywords: | thermoelectric property directional solidification Bi2Te3 density functional theory |
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