材料科学
微观结构
热电效应
热电材料
凝聚态物理
功勋
维氏硬度试验
相变
声子
声子散射
相(物质)
光电子学
复合材料
热力学
热导率
物理
有机化学
化学
作者
Qianqian Sun,Kaiyi Chen,Xiaojian Tan,Hongtao Li,Guangjie Wu,Zhe Guo,Jianfeng Cai,Guoqiang Liu,Jiehua Wu,Jun Jiang
出处
期刊:Small
[Wiley]
日期:2025-02-21
标识
DOI:10.1002/smll.202500333
摘要
Abstract GeTe has good thermoelectric performance at relatively high temperatures, but the low‐symmetry structure near room temperature and phase transition limit its service stability for power generation applications. Here, the thermoelectric properties and mechanical hardness of GeTe are improved by microstructure manipulation and phase transition engineering. The incorporation of Cr, Pb, and Sb into the GeTe lattice modulates the phase transition, increasing the cubic phase fraction from 49% to 73% at 300 K. These modifications introduce shear strains and refined herringbone structures, enhancing phonon scattering while simultaneously improving carrier mobility through dislocation accumulation and band convergence. Consequently, the optimal materials achieve a maximum zT of 2.1 at 700 K and an average zT of 1.5 across the 300–773 K temperature range, along with a Vickers hardness of 1.88 GPa. Paired with n ‐type PbTe, the fabricated seven‐pair module achieves a superior efficiency of 9.7% under a 500 K temperature gradient. This study demonstrates microstructure manipulation is a promising strategy for GeTe‐based thermoelectric applications.
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