<br>通过微结构工程提高 Bi2Te3 材料的热电性能,Advanced Science

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通过微结构工程提高 Bi2Te3 材料的热电性能
Advanced Science ( IF 14.3 ) Pub Date : 2023-12-07 , DOI: 10.1002/advs.202308056
Guoxiang Wang ₁ , Fanzheng Meng ₁ , Yingqi Chen ₁ , Andriy Lotnyk _{1,

2} , Xiang Shen _{1,

3}

Affiliation

由于热电材料的电导率和塞贝克系数的内在矛盾，功率因数（ PF ）的提高受到限制。由于PF决定输出功率，因此提高PF的策略至关重要。在这项工作中，提出了Bi ₂ Te ₃ /Sb和Bi ₂ Te ₃ /W多层膜来增强热电性能。两种体系都具有极高的电导率，约为5.6 × 10 ⁵ S m ^-1 。而且，随着温度的升高，电导率和塞贝克系数同时增加，表明克服了内在矛盾。这导致在 600 K 时 Bi ₂ Te ₃ /W 的超高PF为 1785 µWm ^-1 K ^-2 ，Bi ₂ Te ₃ /Sb 的超高 PF 为 1566 µWm ^-1 K ^-2 。 Bi ₂ Te ₃ / 的热加热Sb 多层系统显示出成分变化，随后形成 Bi-Te-Sb 相、富 Sb Bi-Te 沉淀物和空腔。相反，Bi ₂ Te ₃ /W薄膜的多层结构得以维持，而高结晶质量的Bi ₂ Te ₃晶粒被限制在W层之间。此外，还观察到Bi ₂ Te ₃中的双层缺陷和W层界面处的较小空腔。因此，成分和限制效应以及结构缺陷导致了超高的PF 。总的来说，这项工作展示了如何通过使用多层结构的微结构工程获得商用 Bi ₂ Te ₃材料的超高PF的策略。

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Boosting Thermoelectric Performance of Bi2Te3 Material by Microstructure Engineering

Due to the intrinsic contradiction of electrical conductivity and Seebeck coefficient in thermoelectric materials, the enhancement for the power factor (PF) is limited. Since the PF decides the output power, strategies to the enhancement of PF are of paramount importance. In this work, Bi₂Te₃/Sb and Bi₂Te₃/W multilayer films are proposed to enhance the thermoelectric properties. Both systems possess extremely high conductivity of ≈5.6 × 10⁵ S m⁻¹. Moreover, the electrical conductivity and Seebeck coefficient simultaneously increase as temperature rising, showing the overcome of the intrinsic contradiction. This results in ultrahigh PFs of 1785 µWm⁻¹ K⁻² for Bi₂Te₃/W and of 1566 µWm⁻¹ K⁻² for Bi₂Te₃/Sb at 600 K. Thermal heating of the Bi₂Te₃/Sb multilayer system shows compositional changes with subsequent formation of Bi-Te-Sb phases, Sb-rich Bi-Te precipitates, and cavities. Contrary, the multilayer structure of the Bi₂Te₃/W films is maintained, while Bi₂Te₃ grains of high-crystalline quality are confined between the W layers. In addition, bilayer defects in Bi₂Te₃ and smaller cavities at the interface to W layers are also observed. Thus, compositional and confinement effects as well as structural defects result in the ultrahigh PF. Overall, this work demonstrates the strategies on how to obtain ultrahigh PFs of commercial Bi₂Te₃ material by microstructure engineering using multilayer structures.

更新日期：2023-12-07

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