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通过多元元素兴奋剂研究GeTe合金的热电特性:来自高工程的见解

Yifan Sun¹, Ken Kurosaki¹, Tetsuya Imamura²

¹Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2, Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan.

|August 4, 2025

概括

在 Telluride (GeTe) 合金中使用高性兴奋剂可以提高热电性能. 将黄金 (Au) 添加到基于GeTe的材料中,通过降低导热率,实现了2.0的峰值值值 (zT).

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:

使用多元元素兴奋剂的高工程通过增加晶格障碍来增强热电性质.
基于GeTe的合金在多元元素兴奋剂下表现出更好的热电性能,但优化成分是复杂的.
在高性GeTe合金的庞大组成空间中确定最佳成分仍然是一个挑战.

研究的目的:

通过在现有的基于GeTe的系统中添加黄金 (Au) 来研究高的GeTe合金.
增加元素和结构的复杂性,而不会损害电气性能.
为了增强声子散射和降低网格导热性,以提高热电性能.

主要方法:

由Ge_0.61Ag_0.11Sb_0.13Pb_0.12Bi_0.01Te衍生的高的GeTe合金的合成,其中部分添加了Au.
使用传输电子显微镜 (TEM) 进行表征,观察纳米级晶格扭曲和堆叠故障.
测量热电性质,包括晶格导热率和功率数字 (zT).

主要成果:

传输电子显微镜证实了纳米级晶格扭曲和堆叠故障,增强了质量和应变的波动.
该Ge_0.59Au_0.02Ag_0.11Sb_0.13Pb_0.12Bi_0.01Te组成实现了0.22W m^-1K^{-1的超低晶格导热率.}
优化组合的最大功率 (zT) 为2.0在780K达到.

结论:

高性兴奋剂是一种有效的策略,用于调整基于GeTe的材料的热电性能.
将Au部分添加到GeTe合金中可以提高结构复杂性和声子散射,从而降低热导率.
该研究推动了下一代基于GeTe的热电材料的开发,其效率大大提高.

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