Jianglong Zhu, Fujie Zhang, Yilin Tai, Xiaobo Tan, Qian Deng, Pengfei Nan, Ruihuan Cheng, Chengliang Xia, Yue Chen, Binghui Ge, Ran Ang
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Advanced electron microscopy observation indicates that complex multi-scale hierarchical structures and strain field distributions lead to ultra-low lattice thermal conductivity, and also effectively enhance mechanical properties. High <i>ZT</i> ~ 0.6 at 303 K, average <i>ZT</i><sub>ave</sub> ~ 1.18 from 303 to 553 K, and Vickers hardness of ~200 <i>H</i><sub>v</sub> in Ge<sub>0.78</sub>Cd<sub>0.06</sub>Pb<sub>0.1</sub>Sb<sub>0.06</sub>Te are obtained synchronously. Particularly, a 7-pair TE cooling device with a maximum Δ<i>T</i> of ~45.9 K at <i>T</i><sub>h</sub> = 328 K, and a conversion efficiency of ~5.2% at <i>T</i><sub>h</sub> = 553 K achieving in a single-leg device. 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引用次数: 0
摘要
寻找一种真正的热电(TE)材料,使其在 TE 性能、机械性能、TE 发电和冷却等各方面都表现出色,是其商业化的一大挑战。在此,我们报告了一种具有优异 TE 性能和机械强度的新型多功能 Ge0.78Cd0.06Pb0.1Sb0.06Te 材料,并将其用于构建接近室温的候选 TE 发电和冷却设备。具体而言,带收敛的有效性与优化的载流子浓度和电子品质因数相结合,显著提高了塞贝克系数,从而大大改善了功率因数。先进电子显微镜观察表明,复杂的多尺度分层结构和应变场分布可实现超低晶格热导率,同时还能有效提高机械性能。在 Ge0.78Cd0.06Pb0.1Sb0.06Te 中,同步获得了 303 K 时的高 ZT ~ 0.6,303 至 553 K 的平均 ZTave ~ 1.18,以及 ~200 Hv 的维氏硬度。特别是,在单腿器件中实现了 7 对 TE 冷却器件,在 Th = 328 K 时最大 ΔT 为 ~45.9 K,在 Th = 553 K 时转换效率为 ~5.2%。本研究成果展示了一种开发卓越多功能 GeTe 基合金的独特方法,为商业应用开辟了一条前景广阔的途径。
Enhanced thermoelectric performance and mechanical strength in GeTe enable power generation and cooling
Finding a real thermoelectric (TE) material that excels in various aspects of TE performance, mechanical properties, TE power generation, and cooling is challenging for its commercialization. Herein, we report a novel multifunctional Ge0.78Cd0.06Pb0.1Sb0.06Te material with excellent TE performance and mechanical strength, which is utilized to construct candidate TE power generation and cooling devices near room temperature. Specifically, the effectiveness of band convergence, combined with optimized carrier concentration and electronic quality factor, distinctly boosts the Seebeck coefficient, thus greatly improving the power factor. Advanced electron microscopy observation indicates that complex multi-scale hierarchical structures and strain field distributions lead to ultra-low lattice thermal conductivity, and also effectively enhance mechanical properties. High ZT ~ 0.6 at 303 K, average ZTave ~ 1.18 from 303 to 553 K, and Vickers hardness of ~200 Hv in Ge0.78Cd0.06Pb0.1Sb0.06Te are obtained synchronously. Particularly, a 7-pair TE cooling device with a maximum ΔT of ~45.9 K at Th = 328 K, and a conversion efficiency of ~5.2% at Th = 553 K achieving in a single-leg device. The present findings demonstrate a unique approach to developing superior multifunctional GeTe-based alloys, opening up a promising avenue for commercial applications.
期刊介绍:
InfoMat, an interdisciplinary and open-access journal, caters to the growing scientific interest in novel materials with unique electrical, optical, and magnetic properties, focusing on their applications in the rapid advancement of information technology. The journal serves as a high-quality platform for researchers across diverse scientific areas to share their findings, critical opinions, and foster collaboration between the materials science and information technology communities.