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Updated: Jun 7, 2025

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同时抑制声波运输和载体度,以获得高效的罗姆巴体GeTe热电

Xia Qi^1,2,3, Te Kang¹, Long Yang¹

¹Interdisciplinary Materials Research Center, School of Materials Science and Engineering, Tongji University, 4800 Caoan Road, Shanghai, 201804, China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)

|November 18, 2024

概括

这项研究开发了一种基于GeTe的新型材料,实现了GeTe热电器的最低晶格导热率 (κL). 这一突破提高了热电性能,以有效地回收低级废热.

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:

罗姆体GeTe是有前途的低温热电材料,因为其优越的电子特性.
降低格子导热率 (κL) 对于提高热电性能至关重要,但在低温下具有挑战性.
尽量减少 κL 对于高效的热电装置在 600 K 以下运行至关重要.

研究的目的:

在基于GeTe的材料中实现超低的晶格导热率.
提高热电功率 (zT) 的数字,以有效利用废热.
开发先进的热电发电机,用于低等级的热回收.

主要方法:

合成的 (Ge1-ySbyTe) 1-x(Cu8GeSe6) x合金.
引入了用于声子散射的点缺陷和沉物.
使用异性Sb兴奋剂以优化载体度.
研究了取决于温度的网格导热率 (κL).

主要成果:

达到室温 κL ≈0.55 W m-1K-1,这是基于GeTe的热电学产品中报告的最低值.
通过Cu8GeSe6合金压制Ge沉,使载体度优化成为可能.
在300-625 K之间获得了2.3的峰值zT和平均zTavg约1.2的zTavg.
在282 K的温度差异下,证明了≈9%的转换效率.

结论:

开发的基于GeTe的材料在低温下表现出极好的热电特性.
这种材料对利用低档废热的热电发电机具有很大的潜力.
从缺陷和沉中强烈的声子散射是减少 κL 的关键.

关键词:

标签: 大家来了载体度载体度载体度载体度转换效率的转换效率是什么网格热导电性网格热导电性缺点点是指缺点点的缺陷点,是指缺点点的缺陷点.

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