实现高效的热电模块,通过抑制捐赠者效应和改善n型Bi2的首选方向3
Yichen Li1, Shulin Bai2, Yi Wen1
1School of Materials Science and Engineering, Beihang University, Beijing 100191, China.
Science bulletin
|April 30, 2024
概括
使用间歇性铜和热变形,开发了高性能n型土化物热电材料. 这些材料使高效的热电冷却和发电模块成为可能.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 甲化物 (Bi2Te3) 对于热电应用,如制冷和发电至关重要.
- 开发高性能n型Bi2Te3是必不可少的,但由于机械性能差和热电性能差而受到阻碍.
- 现有的n型Bi2Te3材料限制了基于Bi2Te3的热电装置的发展.
研究的目的:
- 为了优化n型Bi2Te3多晶材料的热电特性.
- 通过材料改进,提高基于Bi2Te3的热电器件的性能.
- 为实际应用开发一种高性能n型Bi2Te3多晶材料.
主要方法:
- 在Bi2Te2.7Se0.3.3中加入间歇性铜 (Cu).
- 采用两步热变形工艺的应用.
- 热电模块 (发电机和冷却器) 的制造和表征.
主要成果:
- 间位Cu减少了缺陷密度和类似于捐赠者的效应,导致了格子平面化.
- 热变形显著改善了首选的方向和电荷载体的移动性.
- 在373K时达到1.27的峰值ZT,在300-425K时达到1.22的平均ZT (ZTave).
- 制造的热电冷却 (TEC) 模块在 350 K 的热端温度下实现了 83.4 K 的 ΔT.
- 制造的热电发电机 (TEG) 模块在225K的ΔT时达到6.5%的转换效率.
结论:
- 间位和热变形是提高n型Bi2Te3热电性能的有效策略.
- 与现有技术相比,优化的材料表现出优越的冷却和发电能力.
- 开发的n型Bi2Te3材料对先进的热电器件具有重大前景.
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