通过Mn兴奋剂增强n型PbTe的热电性能
Tingting Chen1, Yaqi Shao1, Ruilin Feng1
1School of Physics and Electronic Information, Weifang University, Weifang 261061, China.
Materials (Basel, Switzerland)
|March 13, 2025
概括
这项研究使用 (Mn) 兴奋剂增强了n型 telluride (PbTe) 合金. 胺兴奋剂显著提高了Seebeck系数和功率因子,改善了热电性能.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 纳米技术纳米技术
背景情况:
- 热电材料对于废热回收和固态冷却至关重要.
- 与p型对应物相比,n型PbTe合金的热电性能较低,主要是由于提高Seebeck系数的挑战.
- 带融合是改善热电材料Seebeck系数的一个关键策略.
研究的目的:
- 通过引入Mn兴奋剂来增强n型PbTe合金的热电性能.
- 研究胺兴奋剂对西贝克系数,载体度和有效质量的影响.
- 为了降低导热率,并提高n型PbTe的整体功效 (zT) 的数字.
主要方法:
- 在n型Pb0.985Sb0.015Te合金中引入了Mn兴奋剂.
- 进行了Seebeck系数,载体度和有效质量的测量.
- 分析了电子和晶格导热性,以了解热传输机制.
- 在一个温度范围内评估了热电功率 (zT) 值.
主要成果:
- 胺兴奋剂通过提高有效质量和降低载体度,显著增加了Seebeck系数的绝对值.
- 在0.5%Mn-doped样品的573K时,达到20.8μW/K2cm的峰值功率系数.
- 由于电子导热率下降和格子导热率中点缺陷散射的加强,总导热率下降.
- 最低的晶格导热率为1.16Wm-1K-1在2.0%的Mn-doped样品的773K时被观察到.
- 对于1.0%的Mn-doped样本,在773 K时达到1.0的最大zT,平均zT从323-773 K时为0.62.
结论:
- 胺是一种有效的策略,可以提高n型PbTe合金的热电性能.
- 同时优化电气和热传输特性导致显著改善的zT值.
- 这项工作为开发用于实际应用的高性能n型热电材料提供了有前途的方法.
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