带平和应变场有助于n型Bi2Se3的卓越热电性能,适用于室温到中温应用
Vijay Vaiyapuri1,2,3, Kamalakannan Shanmugasundaram2,3, Archana Jayaram2,3
1Nanotechnology Research Centre, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, Tamilnadu, 603 203, India.
Small (Weinheim an der Bergstrasse, Germany)
|February 12, 2025
概括
与和一起配合素化物 (Bi2Se3) 通过优化带结构和声子散射来增强热电性能. 这一策略显著提高了优点 (zT) 的数字,达到0.7的最大值和5.9%的理论效率.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 纳米技术纳米技术
背景情况:
- 石化物 (Bi2Se3) 是一个有前途的n型热电材料.
- 在Bi2Se3中,高晶格导热率阻碍了其热电性能.
- 单元兴奋剂在增强Bi2Se3的热电特性方面有效性有限.
研究的目的:
- 调查协同兴奋剂对Bi2Se3.3.的热电性能的影响.
- 通过协同兴奋剂调整Bi2Se3的带结构和声子传输特性.
- 为了提高Bi2Se3.3的优点 (zT) 和理论效率.
主要方法:
- 与同质 (Ga) 和异质 (Ge) 联合化Bi2Se3.
- 分析载体度调整及其对功率因子的影响.
- 研究声子散射机制和格子导热率的降低.
- 评估热电功率 (zT) 和理论效率的数字.
主要成果:
- 与Ga和Ge的联合兴奋剂显著改善了载体度,从 -1.1 × 10^18 到 -3.56 × 10^18 cm^-3.
- Bi1.95Ga0.05Ge0.033Se3样本在303K时获得了1403μWm^-1K^-2的增强功率系数.
- 由于多尺度的语子散射,格子导热率降低到0.24 Wm^-1K^-1.
- 在513K达到0.7的高峰热电功率 (zT) 和0.68.8的平均zT.
- 在333-573K之间实现了5.9%的理论效率.
结论:
- 联合兴奋剂策略有效地提高了n型Bi2Se3.3的热电性能.
- Ga和Ge联合的协同效应优化了带结构和声子传输.
- 这种方法为改善Bi2Se3在能源转换应用中的zT提供了一条实用途径.
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