Uniaxial-Stress Driven Performance Enhancement of Multi-Beam Spark Plasma Sintered BiSbTe/Epoxy Flexible Films

IF 6.4 3区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Advanced Materials Technologies Pub Date : 2024-05-21 DOI:10.1002/admt.202302226

Xiaoling Ai, Shaoqiu Ke, Xiaolei Nie, Tiantian Chen, Dong Liang, Kai Fu, Wanting Zhu, Ping Wei, Wenyu Zhao, Qingjie Zhang

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Abstract

The multi-beam discharge plasma sintering (MB-SPS) method is successfully applied to the preparation of Bi₂Te₃-based thermoelectric (TE) films with insulating substrates. Herein, the impact of uniaxial stress on the microstructure evolution and TE performance are explored systematically. The results indicate that the increase of uniaxial stress promotes the preferential growth of Bi_0.5Sb_1.5Te₃ (BST) grains along the (000l) crystal plane, leading to the remarkable increase in carrier mobility. The maximum (000l) preferential orientation factor reaches 80% for the BST/epoxy (EP) film sintered under 25 MPa, which is 3.08 times higher than that of BST/EP film sintered at 10 MPa. While the highest power factor reaches 2.36 mW m⁻¹ K⁻² at 300 K for the BST/EP film sintered under 20 MPa, increased by 97% as compared with that of the film sintered under 10 MPa. This work once again confirms that the MB-SPS technology is an effective approach to prepare high-performance Bi₂Te₃-based films with insulating substrates and demonstrates that the (000l) preferential orientation and TE performance of the films can be further enhanced by an appropriate uniaxial stress.

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多束火花等离子烧结 BiSbTe/Epoxy 柔性薄膜的单轴应力驱动性能提升

多束放电等离子烧结（MB-SPS）方法被成功应用于制备基于 Bi2Te3 的绝缘基底热电（TE）薄膜。本文系统地探讨了单轴应力对微结构演变和 TE 性能的影响。结果表明，单轴应力的增加促进了沿 (000l) 晶面的 Bi0.5Sb1.5Te3 (BST) 晶粒的优先生长，从而显著提高了载流子迁移率。在 25 MPa 下烧结的 BST/epoxy (EP) 薄膜的最大（000l）优先取向因子达到 80%，是在 10 MPa 下烧结的 BST/EP 薄膜的 3.08 倍。而在 20 兆帕下烧结的 BST/EP 薄膜在 300 K 时的最高功率因数达到 2.36 mW m-1 K-2，比在 10 兆帕下烧结的薄膜提高了 97%。这项工作再次证实，MB-SPS 技术是制备具有绝缘基底的高性能 Bi2Te3 基薄膜的有效方法，并证明了通过适当的单轴应力可以进一步提高薄膜的（000l）优先取向和 TE 性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advanced Materials Technologies Materials Science-General Materials Science

CiteScore

10.20

自引率

4.40%

发文量

566

期刊介绍： Advanced Materials Technologies Advanced Materials Technologies is the new home for all technology-related materials applications research, with particular focus on advanced device design, fabrication and integration, as well as new technologies based on novel materials. It bridges the gap between fundamental laboratory research and industry.