基于Sn的和n型Bi2的热电材料之间的界面反应
Chao-Hong Wang1, Chun-Wei Chiu1, Mei-Hau Li1
1Department of Chemical Engineering, National Chung Cheng University, Chiayi 621301, Taiwan.
Materials (Basel, Switzerland)
|May 11, 2024
概括
这项研究研究了甲化化热电材料和锡基接剂之间的界面反应. 显著减缓了SnTe的生长,影响了热电装置的可靠性.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 热电材料 热电材料
背景情况:
- 在热电应用中,基于比斯木化物 (Bi2Te3) 的材料至关重要.
- 了解热电材料和器之间的界面反应对于设备的可靠性和性能至关重要.
- 之前的研究集中在p型 (Bi,Sb) 2Te3上,因此需要研究n型Bi2 ((Te,Se) 3.
研究的目的:
- 为了研究n型Bi2(Te,Se) 3和Sn或Sn-Ag-Cu接器之间的界面反应.
- 阐明控制金属间化合物形成的反应机制和动力学.
- 为了比较n型Bi2(Te,Se) 3与p型 (Bi,Sb) 2Te3.3的反应行为.
主要方法:
- 在液态和固态条件下对界面反应的实验研究.
- 反应产物和接口层的微结构分析.
- 使用扩散控制模型对金属间化合物生长的动态分析.
主要成果:
- 液态反应形成了SnTe和BiTe阶段,在SnTe中含有富于Bi的粒子. SnTe的增长遵循了抛物线动力学.
- 固态反应显示了类似的微结构,SnTe是主要产物,BiTe增长最小.
- 与 (Bi,Sb) 2Te3.3相比,Bi2(Te,Se) 3中的Se显著抑制了SnTe的生长. 在 Sn-Ag-Cu 反应中,Cu 扩散到 SnTe 阶段.
结论:
- 在n型Bi2(Te,Se) 3和基于Sn的接器之间的界面反应是扩散控制的.
- 在抑制界面反应速率方面发挥着关键作用,增强了材料的稳定性.
- 了解这些反应对于优化热电设备的包装和长期性能至关重要.
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