缺陷耐受性电子和缺陷敏感的声子运输在近二维联协调聚合物中
Hio-Ieng Un1, Kamil Iwanowski2,3, Jordi Ferrer Orri4
1Optoelectronics Group, Cavendish Laboratory, University of Cambridge, Cambridge, UK. hiu20@cam.ac.uk.
Nature communications
|July 18, 2025
概括
新的热电材料将废热转化为电力. 这些准二维联协调聚合物表现出耐缺陷的电荷传输和对缺陷敏感的热传输,以实现高效的能量转换.
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:
- 热电材料对于废热转化为电力至关重要.
- 同时实现高电导率和低热导率是一个重大挑战.
- 传统材料往往表现出合的电气和热传输特性.
研究的目的:
- 发现具有有利的运输特性的新型热电材料.
- 探索用于热电应用的准二维联协调聚合物薄膜.
- 研究材料结构与热电性能之间的关系.
主要方法:
- 准二维联协调聚合物薄膜的制造和表征.
- 测量电导率和热导率.
- 分析格子动力学和振动特性.
- 结构障碍 (甲晶性) 与传输性质的相关性.
主要成果:
- 在这些电影中发现了一种独特的热电传输模式.
- 在基特尔的极限以下,实现了极低的晶格导热率 (0.2 W m-1 K-1).
- 观察到高电导率 (高达2000 S cm−1) 与金属的温度依赖.
- 证明,具有高准晶度 (>10%) 的不良晶体结构可以提高热电性能.
- 鉴定了温度激活,由于特定的格子动力学和散射机制,低格子导热率.
结论:
- 几乎二维的联协调聚合物提供了有利的热电传输模式.
- 这些材料表现出耐缺陷的电荷传输和对缺陷敏感的热传输.
- 这些材料具有理想的对立性质组合,可实现高效的热电转换.
- 易于加工和耐缺陷性使得这些材料在废热能量采集应用中具有前景.
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