降低域密度可以提高 GeTe 的转换效率
Yi-Fen Tsai1, Min-Jung Yang2, Jie-Ru Deng3
1Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, 30010, Taiwan.
Small (Weinheim an der Bergstrasse, Germany)
|March 14, 2024
概括
将少量添加到化 (GeTe) 中,可以显著增强其热电特性. 这种优化的材料显示了高效的中温能源发电效率.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 能源转换 能源转换
背景情况:
- 热电 (TE) 材料对于能源采集和冷却应用至关重要.
- telluride (GeTe) 是一个有前途的 TE 材料,但它的效率需要改进.
- 控制微观结构和缺陷是优化TE性能的关键.
研究的目的:
- 调查稀兴奋剂和热压对GeTe.Te的热电特性的影响.
- 提高基于GeTe的材料的价值 (zT) 和转换效率.
- 探索改性GeTe在中温能源发电方面的潜力.
主要方法:
- 用对GeTe进行稀释兴奋剂.
- 控制合成和热压技术.
- 使用传输电子显微镜 (TEM) 和几何相位分析 (GPA) 的微结构分析.
- 测量热电性质,包括功率 (zT) 和转换效率.
主要成果:
- 热压增加了缺陷密度,重新分配了应变,并防止了Ge沉.
- 与未添加的GeTe相比,添加的GeTe (In-GeTe) 显示出明显改善的TE特性.
- 在683K时,获得了1.3的最大功率 (zT).
- 在723K的热面温度下,记录了2.83%的异常TE转换效率.
- 改进归因于通过热压的域密度工程.
结论:
- 稀释的兴奋剂与热挤压相结合是一种有效的策略,可以提高GeTe的TE性能.
- In-GeTe合金表现出优越的TE特性和稳定性,使其适合中温TE发电.
- 域密度工程在优化热电转换效率方面发挥着至关重要的作用.
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