稀mnbi2te4合金化可实现高性能GeTe热电器件

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-05-15 DOI:10.1063/5.0267606

Dan Zhang, Hongli Wang, Jiandong Liu, Manzhe Zhao, Guannan Liu, Junyou Yang, Yubo Luo, Shufang Wang

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引用次数: 0

摘要

GeTe作为一种极具吸引力的无铅热电材料，受到了广泛的关注。然而，极高的空穴浓度严重限制了原始GeTe的热电性能。在这项工作中，稀化mnbi2te4合金用于协同优化GeTe的电输运和热输运性能，以提高热电性能。它不仅可以减少锗的析出以优化载流子浓度，而且可以促进多带收敛以增大态有效质量的密度。此外，mnbi2te4合金样品也保持了适度的载流子迁移率。此外，声子点缺陷散射的增加导致晶格导热系数的显著降低。因此，在723 K时，4% mnbi2te4合金GeTe的峰值热电性能（ZT）达到1.8，在300至723 K时，平均ZT达到1.0，表明稀化合物合金化可以通过同时调节电学和热输运性质来提高GeTe的热电性能。

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Dilute MnBi2Te4-alloying enables high-performance GeTe thermoelectrics

As an attractive lead-free thermoelectric material, GeTe has gained widespread interest. However, the extremely high hole concentration seriously limits the thermoelectric performance of pristine GeTe. In this work, dilute MnBi2Te4-alloying is utilized to synergically optimize electrical- and thermal-transport properties of GeTe for thermoelectric performance improvement. It can not only decrease the precipitation of Ge to optimize carrier concentration, but also promote multi-band convergence to enlarge the density of state effective mass. Furthermore, the MnBi2Te4-alloyed samples also maintain a moderate carrier mobility. In addition, the increased point-defect scattering for phonons leads to the significant reduction in lattice thermal conductivity. Consequently, a high peak thermoelectric figure of merit (ZT) of ∼1.8 at 723 K and a large average ZT of ∼1.0 from 300 to 723 K are achieved in 4% MnBi2Te4-alloyed GeTe, showing the potential of dilute compound alloying to enhance the thermoelectric performance of GeTe by the concurrent regulation of electrical- and thermal-transport properties.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.