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Updated: Sep 14, 2025

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通过固体溶液处理的铜离子扩散正在推进基于GeTe的热电学

Yongqi Chen¹, Meng Li², Xiaodong Wang³

¹School of Chemistry and Physics, ARC Research Hub in Zero-emission Power Generation for Carbon Neutrality, and Centre for Materials Science, Queensland University of Technology, Brisbane, Queensland, Australia.

Nature communications

|July 23, 2025

概括

这项研究引入了一种针对热电材料的新型固体溶液兴奋剂策略,使得有针对性的铜 (Cu) 离子放置成为可能. 这种方法减少了缺陷并提高了热电性能,实现了2.3.3的功率数字.

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:

铜 (Cu) 和银 (Ag) 等硬币金属是热电材料的已知剂,优化载体度和流动性.
传统的兴奋剂方法,如eutectic反应,往往导致不良的间歇性兴奋剂,创造格子缺陷.

研究的目的:

开发一种创新的固体溶液兴奋剂策略,用于精确地将铜 (Cu) 离子纳入宿主格子站点.
研究针对性兴奋剂对基材料的晶格结构,缺陷和热电特性的影响.

主要方法:

使用了第一原则计算和现场实验技术.
采用固体溶液兴奋剂策略用于向的铜 (Cu) 离子替代.
分析了离子扩散,格子重新规范化和缺陷减少.

主要成果:

证明有针对性的兴奋剂仅将Cu离子放置在宿主晶格位置上,避免间歇位置.
观察到格子重新规范化,导致格子缺陷减少和孔度抑制.
在775K时达到2.3的高功率 (ZT) 值,而在0.5%的 doped Ge$_{0.85}$Sb$_{0.10}$Te时为1个,平均ZT在300-775K时为1.4.
报告了一条单脚热电模块的功率密度为2.23W·cm$^{-2}$.

结论:

固体溶液兴奋剂策略为创造高质量的热电材料提供了一条新的途径,可以减少缺陷并增强载体移动性.
了解动态兴奋剂的动力学对于优化热电材料性能至关重要.
这种方法可以精确控制剂的位置,大大提高了热电效率.

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