多功能GeMnTe2协同优化SnTe-In2Te3合金的热电特性
Ruiheng Li1, Fujie Zhang1, Wenxin Ou1
1Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China.
ACS applied materials & interfaces
|December 1, 2023
概括
将GeMnTe2引入SnTe-In2Te3合金中,通过提高电性能和降低导热率,提高了热电性能. 这种新型合金达到约1.25的峰值值 (zT),提高了热电转换效率.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 热电学是一种热电学.
背景情况:
- 由于共振水平,SnTe-In2Te3合金具有出色的电性能,但性能受到温度敏感状态和声子散射的限制.
- 提高热电性能需要引入散射源来阻碍声子传输,而不会降低电气性能.
研究的目的:
- 通过引入GeMnTe2.2.3来提高SnTe-In2Te3合金的热电性能.
- 研究GeMnTe2合金对电气和热传输特性的影响.
主要方法:
- 通过立方体GeMnTe2.2.的固化制备SnTe-In2Te3-GeMnTe2合金.
- 分析结构变化,包括Mn2+溶解,空缺,替代和Ge/Mn沉物.
- 在一个温度范围内测量电特性 (Seebeck系数,功率因子) 和热导率.
主要成果:
- GeMnTe2合金促进了价值带的融合,并增强了Seebeck系数,在更高的载体度下平衡了共振效应.
- 在整个温度范围内实现了1.94mW m-1 K-2的高平均功率系数.
- 由于合金诱导的散射,格子导热率降低 (κl ~ 0.6 W m-1 K-1 在850 K)
- 实现了高峰热电功率 (zT) 值在850K时为1.25~,平均zT值为0.72 (300-850K).
- 最大热电转换效率达到了2.8% (ΔT ~ 450 K).
结论:
- GeMnTe2充当多功能添加剂,显著提高了SnTe-In2Te3合金的热电性能.
- 改进的电传输和降低的导热率的结合效应导致了优越的热电特性.
- 这项研究表明了开发高性能热电材料的有希望的战略.
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