增强谷物边界实现了基于GeTe的热电材料中的非凡模块效率
Kaiyi Chen1,2, Qianqian Sun2,3, Hongtao Li2
1School of Material Science and Engineering, Shanghai University, Shanghai, 200444, China.
Small (Weinheim an der Bergstrasse, Germany)
|April 4, 2025
概括
研究人员开发了先进的 Telluride (GeTe) 热电材料,提高了性能. 这项创新提高了热电转换效率和机械强度,用于更好的能源采集应用.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 纳米技术 纳米技术
背景情况:
- 像粒度边界这样的平面缺陷在 Telluride (GeTe) 热电材料中显著影响声子和载体运输.
- 在GeTe中同时实现高热电功率 (zT) 和机械稳定性是一项挑战.
研究的目的:
- 同时提高高合金Ge.Te的热电功率 (zT) 和机械强度.
- 调查Cd兴奋剂和Cu2Se-PbSe联合合金对GeTe热电和机械性能的影响.
主要方法:
- 在Cd合和Cu2Se-PbSe合金合金的Ge.Te.
- 形成密集的纳米粒边界和点缺陷以分散声子.
- 优化载体度和价值带的融合,以改善电子传输.
主要成果:
- 在700K达到2.1的峰值zT,在 (Ge0.98Cd0.02Te) 0.88(Cu2Se) 0.02(PbSe) 0.1.1.中达到1.4的平均zT (300-800K).
- 由于等级结构,获得了大约210HV的高维克斯硬度.
- 制造了一种热电模块,输出功率密度为0.86 W cm-2,在ΔT = 501 K时的转换效率为11%.
结论:
- 同时优化声子散射和电子传输导致合金Ge.Te.中优越的热电性能.
- 开发的GeTe材料具有出色的机械强度,对于实际的热电器件应用至关重要.
- 在zT和机械性能上的协同改进使得高效的热电能转换成为可能.
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