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Highly tailored gap-like structure for excellent thermoelectric performance
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2022-09-03 , DOI: 10.1039/d2ee02336a
Xiao Xu 1 , Yi Huang 1 , Xixi Liu 1 , Baohai Jia 1 , Juan Cui 1 , Ran He 2 , Jinghan Wang 1 , Yiyuan Luo 1 , Kornelius Nielsch 2 , Jiaqing He 1
Affiliation  

The microstructure-dependent thermal transport property has drawn significant attention in the thermoelectric community for elevating thermoelectric performance. In this work, we characterized gap-like structures and improved their controllability in GeTe-rich Sb2Te3(GeTe)n samples. The statistics of the gap-like structures were studied through direct observation using a transmission electron microscope with atomic-resolved spherical aberration correction. We found a strong and unambiguous linear correlation of the nominal composition to the planar density and sizes of the gap-like structures. This microstructure tailoring further enabled a significant reduction in lattice thermal conductivity, an ultrahigh maximum ZT value of ∼2.4 at 773 K, and an average ZT value of ∼1.51 from 323 K to 773 K in p-type Sb2Te3(Ge0.995Yb0.005Te)17. Together with n-type Pb0.985Sb0.015Te, we further fabricated a single-stage thermoelectric module that realized an exceptional output power density value of 1.25 W cm−2 and an efficiency of 7.5% under a temperature gradient of 480 K. Our pioneering strategy validated the beneficial effect of gap-like-structure tailoring for improving thermoelectric performance, laying the groundwork for similar studies on other thermoelectric materials.

中文翻译:

高度定制的间隙状结构,具有出色的热电性能

与微观结构相关的热传输特性在热电界引起了人们的极大关注,以提高热电性能。在这项工作中,我们在富含 GeTe 的 Sb 2 Te 3 (GeTe) n样品中表征了间隙状结构并提高了它们的可控性。通过使用具有原子分辨球差校正的透射电子显微镜直接观察,研究了间隙状结构的统计数据。我们发现标称成分与间隙状结构的平面密度和尺寸之间存在强烈且明确的线性相关性。这种微结构剪裁进一步显着降低了晶格热导率,超高的最大ZT在 773 K 时的 ZT值约为 2.4,在 p 型 Sb 2 Te 3 (Ge 0.995 Yb 0.005 Te) 17中,从 323 K 到 773 K的平均ZT值约为 1.51 。与 n 型 Pb 0.985 Sb 0.015 Te 一起,我们进一步制造了单级热电模块,该模块在 480 K 的温度梯度下实现了 1.25 W cm -2的出色输出功率密度值和 7.5% 的效率。我们的开创性该策略验证了间隙状结构剪裁对提高热电性能的有益效果,为其他热电材料的类似研究奠定了基础。
更新日期:2022-09-03
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