Realizing high power factor in p-type BiSbTe flexible thin films via carrier engineering

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-08-31 DOI:10.1007/s12598-024-02962-9

Dong-Wei Ao, Bo Wu, Wei-Di Liu, Xiang-Bo Shen, Wen-Qing Wei

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Abstract

Flexible thermoelectric thin films offer a promising avenue for the development of portable and sustainable flexible power supplies. However, a lack of thin films with excellent performance restricts their application in flexible thermoelectric devices. In this study, high-performance BiSbTe films are successfully prepared using a combination of magnetron sputtering and thermal diffusion. By optimizing carrier concentration to ~ 4.47 × 10¹⁹ cm⁻³ and simultaneously realizing high carrier mobility of > 120 cm²·V⁻¹·s⁻¹, an impressive room-temperature power factor of 24.13 μW·cm⁻¹·K⁻² is achieved in a Bi_0.4Sb_1.6Te₃ thin film. The flexible Bi_0.4Sb_1.6Te₃ thin film also demonstrates excellent bending resistance and stability (ΔR/R₀ < 5%, ΔS/S₀ < 5%, and ΔS²σ/S₀²σ₀ < 10%) after 1000 bending cycles at a minimum bending radius of 6 mm. A flexible thin-film thermoelectric device assembled with p-type Bi_0.4Sb_1.6Te₃ legs achieves a remarkable power output of ~ 82.15 nW and a power density of ~ 547.68 μW·cm⁻² under a temperature difference of 20 K.

Graphical abstract

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通过载流子工程实现 p 型 BiSbTe 柔性薄膜的高功率因数

柔性热电薄膜为开发便携式可持续柔性电源提供了一条前景广阔的途径。然而，由于缺乏性能优异的薄膜，限制了它们在柔性热电设备中的应用。本研究采用磁控溅射和热扩散相结合的方法成功制备了高性能 BiSbTe 薄膜。通过将载流子浓度优化至 ~ 4.47 × 1019 cm-3，同时实现 > 120 cm2-V-1-s-1 的高载流子迁移率，Bi0.4Sb1.6Te3薄膜的室温功率因数达到了惊人的 24.13 μW-cm-1-K-2。这种柔性 Bi0.4Sb1.6Te3 薄膜在最小弯曲半径为 6 毫米的条件下，经过 1000 次弯曲循环后，还表现出卓越的抗弯曲性和稳定性（ΔR/R0 < 5%、ΔS/S0 < 5%、ΔS2σ/S02σ0 < 10%）。用 p 型 Bi0.4Sb1.6Te3 脚组装的柔性薄膜热电器件在 20 K 的温差下实现了 ~ 82.15 nW 的显著功率输出和 ~ 547.68 μW-cm-2 的功率密度。

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.