High density lath twins lead to high thermoelectric conversion efficiency in Bi₂Te₃ modules.

IF 12.2 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Materials Horizons Pub Date : 2024-10-28 DOI:10.1039/d4mh00977k

Qianqian Sun, Gang Wu, Xiaojian Tan, Qiang Zhang, Zhe Guo, Qiaoyan Pan, Guoqiang Liu, Peng Sun, Jiehua Wu, Jun Jiang

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引用次数: 0

Abstract

Thermoelectric (TE) generators based on bismuth telluride (Bi₂Te₃) are recognized as a credible solution for low-grade heat harvesting. In this study, an combinative doping strategy of both the donor (Ag) and the acceptor (Ga) in Ag₉GaTe₆ as dopants is developed to modulate the microstructure and improve the ZT value of p-type Bi_0.4Sb_1.6Te₃. Specifically, the distribution of Ag and Ga in the matrix synergistically introduces multiple phonon scattering centers including lath twins, triple junction boundaries, and Sb-rich nanoprecipitates, leading to an obviously suppressed lattice thermal conductivity of 0.50 W m^-1 K^-1 at 300 K. At the same time, such unique microstructures of lath twins synergistically enhance the room-temperature power factor to 48.8 μW cm^-1 K^-2 and improve the Vickers hardness to 0.90 GPa. Consequently, a high ZT of 1.40 at 350 K and ZT_ave of 1.24 (300-500 K) are achieved in the Bi_0.4Sb_1.6Te₃ + 0.03 wt% Ag₉GaTe₆ sample. Based on that, a competitive conversion efficiency of 6.5% at ΔT = 200 K is obtained in the constructed 17-couple TE module, which exhibits no significant change in the output property after 30 thermal cycle tests benefiting from the stable microstructure.

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高密度板条孪晶可提高 Bi2Te3 模块的热电转换效率。

基于碲化铋（Bi2Te3）的热电（TE）发电机被认为是低品位热量收集的可靠解决方案。在本研究中，开发了一种将 Ag9GaTe6 中的供体（Ag）和受体（Ga）作为掺杂剂的组合掺杂策略，以调节 p 型 Bi0.4Sb1.6Te3 的微观结构并提高其 ZT 值。具体来说，Ag 和 Ga 在基体中的分布协同引入了多个声子散射中心，包括板条孪晶、三重结界和富含 Sb 的纳米沉淀物，从而明显抑制了 300 K 时 0.50 W m-1 K-1 的晶格热导率。同时，板条孪晶这种独特的微结构协同将室温功率因数提高到 48.8 μW cm-1 K-2，并将维氏硬度提高到 0.90 GPa。因此，Bi0.4Sb1.6Te3 + 0.03 wt% Ag9GaTe6 样品在 350 K 时的 ZT 值高达 1.40，ZTave 值达 1.24（300-500 K）。在此基础上，所构建的 17 个耦合 TE 模块在 ΔT = 200 K 时的转换效率达到了 6.5%，得益于稳定的微观结构，经过 30 次热循环测试后，其输出特性没有发生显著变化。

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

Materials Horizons CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

18.90

自引率

2.30%

发文量

306

审稿时长

1.3 months

期刊介绍： Materials Horizons is a leading journal in materials science that focuses on publishing exceptionally high-quality and innovative research. The journal prioritizes original research that introduces new concepts or ways of thinking, rather than solely reporting technological advancements. However, groundbreaking articles featuring record-breaking material performance may also be published. To be considered for publication, the work must be of significant interest to our community-spanning readership. Starting from 2021, all articles published in Materials Horizons will be indexed in MEDLINE©. The journal publishes various types of articles, including Communications, Reviews, Opinion pieces, Focus articles, and Comments. It serves as a core journal for researchers from academia, government, and industry across all areas of materials research. Materials Horizons is a Transformative Journal and compliant with Plan S. It has an impact factor of 13.3 and is indexed in MEDLINE.