通过Mn兴奋剂增强的格子对称性通过Mn兴奋剂增强了面GeSe热电材料中的电传输性能
Sining Wang1,2, Yi Wen1, Shulin Bai1
1School of Materials Science and Engineering, Beihang University, Beijing, 100191, China.
Nature communications
|November 24, 2025
概括
在烯化 (GeSe) 中的兴奋剂增强了晶格对称性,提高了热电性能. 这一战略显著改善了电力运输特性,实现了创纪录的功率系数和高ZT,以实现高效的能量转换.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 能源转换 能源转换
背景情况:
- 像GeSe这样的低对称度热电材料具有较低的导热率,但电性能差.
- 提高电传输,同时保持低导热率对于高效的热电设备至关重要.
研究的目的:
- 通过操纵其晶体结构和电子带结构来提高GeSe的热电性能.
- 研究胺和AgBiTe2合金对GeSe.Se的热电特性的影响.
主要方法:
- 合成的Mn-dopedAgBiTe2-合金GeSe. 合成的Mn-dopedAgBiTe2-合金GeSe. 合成的Mn-dopedAgBiTe2合金GeSe. 合成的AgBiTe2合金GeSe. 合成的AgBiTe2合金GeSe. 合成的AgBiTe2合金GeSe. 合成的AgBiTe2合金GeSe. 合成的AgBiTe2合金GeSe.
- 研究了兴奋剂对格子对称性,带结构和电子/热传输特性的影响.
- 评估了热电性能指标,包括Seebeck系数,功率系数和功率 (ZT) 数字.
主要成果:
- 胺和AgBiTe2合金显著增强了GeSe的晶格对称性.
- Mn诱导的共振水平优化了Seebeck系数和状态有效质量的密度.
- 升高的格子对称性减少了声子散射,并增加了185%的载体移动性.
- 在673K时实现了~17μWcm−2K−2的记录平均功率系数和~1.50的最大ZT.
- 获得了6.1%的热电转换效率.
结论:
- 通过理性兴奋剂来操纵格子对称性是一种切断电荷和热传输的可行策略.
- 这种方法显著提高了低对称性材料的热电性能.
- 开发的材料为高效的热电能转换提供了一个有希望的途径.
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