增强纹理Bi1-Sb带的冷热电性能,具有电子相位转换
Jian Wang1, Lijun Zhai2,3, Wen Zhang1
1Hubei Longzhong Laboratory, Wuhan University of Technology, Xiangyang Demonstration Zone, Xiangyang 441000, China.
ACS applied materials & interfaces
|December 12, 2024
概括
在 (Bi) 合金中使用反 (Sb) 兴奋剂可通过优化带结构和载体度来提高冷热电性能. 这导致了功率因子的改善和低于200K的高效热电器件.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- - (Bi-Sb) 合金是低温热电应用的关键材料,在200K以下工作.
- 优化热电性能需要仔细调整电子带结构和电荷载体特性.
研究的目的:
- 通过受控的抗兴奋剂和纹理来提高Bi-Sb合金的热电性能.
- 为了研究狄拉克电子相位过渡对热电性质的影响.
主要方法:
- 使用融制备高度 (00l) 纹理的Bi-Sb丝带.
- 通过反 (Sb) 兴奋剂调整电子带结构,以诱导迪拉克电子相位过渡.
- 热电传输性质的表征,包括Seebeck系数,导电率和功率因子.
主要成果:
- 由于对齐的费米口袋,高度 (00l) 纹理的Bi-Sb带表现出更好的Seebeck系数.
- 抗兴奋剂降低了载体度,并增加了Seebeck系数.
- 在Sb兴奋剂水平x=0.04的迪拉克电子相位过渡增强了载体流动性,保持导电性.
- 在140K时,Bi0.96Sb0.04.0的优化功率系数为61.1μW·cm−1·K−2得到了实现.
结论:
- 在Bi-Sb合金中调节迪拉克相变是提高冷热电性能的有效策略.
- 优化的Bi0.96Sb0.04带展示了高效的热电发电机和冰箱的潜力.
- 一个由优化带制造的平面热电装置显示出高开通电路电压和输出功率密度.
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