晶体对称性修改使n型SnSe晶体的高范围平面内热电性能成为可能
Haonan Shi1,2,3, Yi Wen1, Shulin Bai1
1School of Materials Science and Engineering, Beihang University, Beijing, China.
Nature communications
|February 20, 2025
概括
优化锡化 (SnSe) 与和的晶体对称性,可以提高热电性能. 这种修改提高了载体移动性和功率系数,实现高效发电的峰值ZT为0.89.
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:
- 锡化 (SnSe) 是一个有前途的热电材料,具有强大的平面内机械性能.
- 提高SnSe中的热电性能对于实际的能源应用至关重要.
研究的目的:
- 为了优化n型SnSe的平面内热电性能.
- 为了研究晶体对称性修改对热电性质的影响.
主要方法:
- 将SnSe与 (Te) 和 (Mo) 合金,以修改晶体对称性.
- 描述由此产生的载体移动性,电传输和导热性的变化.
- 评估热电功率 (ZT) 和设备效率.
主要成果:
- Te和Mo合金增加了晶体对称性和载体移动性,达到大约422cm2V-1s-1.1.
- 导电带的融合改善了电传输,而晶格导热率降低到大约1.1 W m-1 K-1.1.
- 实现了大约28μWcm−2K−2的功率系数和300K的ZT约为0.6,300-723K的平均ZT为0.89.
结论:
- 晶体对称性修改是一种有效的策略,可以提高n型SnSe的热电性能.
- 优化的SnSe在发电和废热回收应用中显示出巨大的潜力.
- 一个单脚装置在n型SnSe.Se中实现了约5.3%的记录效率.
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