在GeTe热电中通过Ga诱导的多频带谷工程平衡有效质量和载体流动性
Jianglong Zhu1, Yan Zhong2, Xiang An3
1College of Physics, Chengdu University of Technology, Chengdu, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|February 15, 2026
概括
在GeBiTe中的兴奋剂通过优化电子带结构和降低导热率来提高热电性能. 这导致了高功率 (ZT) 和高效的无热电装置.
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:
- 实现高热电性能需要平衡密度状态的有效质量 (m*) 和载体流动性 (μ).
- 多带谷工程增强了m*,但往往减少了μ,限制了功率 (ZT) 的数字.
研究的目的:
- 使用 (Ga) 兴奋剂来定制Ge$_{0.94}$Bi$_{0.06}$Te的电子带结构.
- 为了同时增强m*并保持载体运动 (μ) 以改善热电性质.
- 调查Ga兴奋剂对格子导热率和整体ZT的影响.
主要方法:
- 使用GA兴奋剂来修改Ge$_{0.94}$Bi$_{0.06}$Te的电子带结构.
- 对价值带收,中隙带出现和载体移动性的分析.
- 调查Ga-Te粘合,接口特性,以及格子导热降低机制.
主要成果:
- 三个价值带边的同时收和一个中间距离带的出现增强了m*和Seebeck系数.
- 由于Ga-Te粘合和有利的接口,减少了载体散射和保留了高μ.
- 在653K时达到超过2.1的高功率 (ZT),在无装置中功率转换效率为7.7%.
结论:
- 加剂有效地优化了GeBiTe中的m*和μ之间的平衡,从而产生了优越的热电性能.
- 由Ga引起的晶格障碍和工程缺陷显著抑制了晶格的导热性.
- 这项研究为设计高性能,无热电材料和设备提供了洞察力.
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