在p型 (Bi,Sb) 2Te3中通过协同双和缺陷工程实现高热电性能
Hailong He1, Tao Xiong1, Ge Tian1
1State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
Small (Weinheim an der Bergstrasse, Germany)
|September 19, 2025
概括
研究人员使用伊特尔 (Yb) 和锡 (Sn) 的兴奋剂增强了-热电材料. 这提高了用于发电和固态冷却应用的热电性能.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 纳米技术 纳米技术
背景情况:
- 基于比斯-的合金对于热电应用至关重要.
- 提高它们的热电性能是有效能源转换和冷却的关键.
- 目前的材料在功率因子和功率 (zT) 方面面临限制.
研究的目的:
- 开发一种创新策略,用于增强高 bismuth-tellurium热电材料.
- 改进电传输特性,降低热导率.
- 探索实际发电和固态制冷的潜力.
主要方法:
- 在Bi0.4Sb1.6Te3合金中加入微量Ytterbium (Yb),以诱导带分裂.
- 引入锡 (Sn) 兴奋剂以创建共振水平.
- 微观结构分析以确定声子散射点 (粒度边界,沉物,堆叠断层).
主要成果:
- Yb兴奋剂显著提升了电力运输,实现了53μW cm-1 K-2 的功率系数,并在373K时达到1.46的zT.
- Yb和Sn的联合兴奋剂进一步提高了性能,在373K时达到1.48的zT峰值.
- 一个单脚发电模块实现了6.35%的效率 (ΔT = 214K);一个八对冷却模块实现了75.8K的冷却 (负载 = 350K).
结论:
- 微量Yb和Sn的联合剂是一种有效的策略,可以增强高 bismuth-tellurium合金的热电特性.
- 改进的材料显示出高效的热电发电和固态冷却的巨大潜力.
- 开发的模块在实际应用中显示出有前途的性能.
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