Construction of nano-lamellar expressways and multidimensional defects to realize the decoupling of carrier–phonon transport in BiSbSe1.25Te1.75†

IF 6.1 1区 化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR
Zhen Tian, Quanwei Jiang, Keqiang Su, Xiaowei Shi, Jianbo Li, Huijun Kang, Zongning Chen, Enyu Guo and Tongmin Wang
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Abstract

BiSbSe1.25Te1.75, a typical multi-layered compound, has great potential for use in the manufacture of high-efficiency thermoelectric conversion devices due to its ability to be fabricated with p–n junctions of identical chemical composition by defect engineering. However, the thermoelectric properties of n-type BiSbSe1.25Te1.75 remain limited due to its poor electrical transport properties. Herein, we report an effective strategy to decouple its electrical and thermal transport properties, which can be realized by simple hot deformation of BiSbSe1.25Te1.75. Nanoscale lamellar structures with large surface areas and strongly preferred orientation formed by preferred growth along the ab planes provide expressways for electron transport. These structures are beneficial for promoting S while maintaining high σ because the expressways will effectively reduce the sacrifice through μH. Meanwhile, multidimensional defects are also introduced into samples by hot deformation, evoking strong scattering locations for phonons of different frequencies. Benefiting from the decoupling of carrier–phonon transport via hot deformation, a high average ZT value of 0.53 from 323 to 550 K (∼112% increase) and a high ZT value of 0.60 at 470 K (∼107% increase) are achieved in BiSbSe1.25Te1.75. This work undoubtedly paves the way for the utilization of TE materials with identical chemical composition in the fabrication of well-matched p–n junctions.

Abstract Image

构建纳米层状高速公路和多维缺陷实现了BiSbSe1.25Te1.75中载流子-声子输运的解耦
BiSbSe1.25Te1.75是一种典型的多层化合物,由于其能够通过缺陷工程制造化学成分相同的p-n结,因此在制造高效热电转换器件方面具有很大的潜力。然而,由于n型BiSbSe1.25Te1.75的电输运性能较差,其热电性能仍然受到限制。本文报道了一种有效的电输运和热输运之间的解耦策略,可以通过对BiSbSe1.25Te1.75进行简单的热变形来实现。沿ab平面择优生长形成的具有大表面积和强择优取向的纳米片层结构为电子传递提供了高速通道。高速公路可以有效降低μH的牺牲,有利于在保持高σ的同时提高S。同时,在热变形样品中引入多维缺陷,引起不同频率声子的强散射。得益于热变形对载流子-声子输运的去耦,在323 ~ 550 K范围内获得了0.53的高平均ZT值(提高了~ 112%),在470 K范围内获得了0.60的高平均ZT值(提高了~ 107%)。这项工作无疑为利用具有相同化学成分的TE材料制造匹配良好的p-n结铺平了道路。
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来源期刊
Inorganic Chemistry Frontiers
Inorganic Chemistry Frontiers CHEMISTRY, INORGANIC & NUCLEAR-
CiteScore
10.40
自引率
7.10%
发文量
587
审稿时长
1.2 months
期刊介绍: The international, high quality journal for interdisciplinary research between inorganic chemistry and related subjects
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