Achieving high carrier mobility and thermoelectric performance in nearly twin-free rhombohedral GeTe (00l) films

IF 9 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Materials Today Energy Pub Date : 2024-03-08 DOI:10.1016/j.mtener.2024.101550

Tuo Chen, Qian Xiang, Haoran Ge, Ziwei Li, Fan Yan, Jiahong Cheng, Min Hong, Yubo Luo, Junyou Yang, Yong Liu, Wei Liu, Xinfeng Tang

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Abstract

GeTe-based thermoelectric (TE) films have garnered significant attentions due to their promising TE performance near room temperature. However, it is challenging to further optimizing the TE performance due to the inferior carrier mobility () and the excessively high hole density (). Herein, we developed a novel method based on molecular beam epitaxy (MBE) technique to successfully fabricate nearly twin-free GeTe (00) films incorporating BiTe buffer layers to alleviate epitaxial strain. Consequently, was significantly enhanced. Additionally, through comprehensively investigating the processing conditions, we found that substrate temperature and Te/GeTe flux ratio can shape intrinsic atomic defects and further decrease . With the optimal synthesis and processing conditions, the GeTe film achieves optimized of 3.44×10 cm and a high of 73.31 cmVs, which lead to the highest room-temperature power factor of 2.67 mWmK, outperforming the values of other GeTe films. This work provides important guidance on fabricating twin-free GeTe films and on further improving their TE performance.

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在近乎无孪晶的斜面 GeTe (00l) 薄膜中实现高载流子迁移率和热电性能

基于 GeTe 的热电（TE）薄膜在室温附近具有良好的 TE 性能，因而备受关注。然而，由于载流子迁移率（）较低和空穴密度（）过高，进一步优化 TE 性能具有挑战性。在此，我们开发了一种基于分子束外延（MBE）技术的新方法，成功制备出几乎无孪晶的 GeTe (00) 薄膜，并在其中加入了 BiTe 缓冲层，以减轻外延应变。因此，GeTe（00）薄膜的性能得到了显著提高。此外，通过对加工条件的全面研究，我们发现衬底温度和 Te/GeTe 通量比可以形成本征原子缺陷，并进一步降低 GeTe (00) 的应变。在最佳合成和加工条件下，GeTe 薄膜达到了 3.44×10 cm 的优化值和 73.31 cmVs 的高值，从而实现了 2.67 mWmK 的最高室温功率因数，优于其他 GeTe 薄膜的数值。这项工作为制造无孪晶 GeTe 薄膜以及进一步提高其 TE 性能提供了重要指导。

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 Today Energy Materials Science-Materials Science (miscellaneous)

CiteScore

15.10

自引率

7.50%

发文量

291

审稿时长

15 days

期刊介绍： Materials Today Energy is a multi-disciplinary, rapid-publication journal focused on all aspects of materials for energy. Materials Today Energy provides a forum for the discussion of high quality research that is helping define the inclusive, growing field of energy materials. Part of the Materials Today family, Materials Today Energy offers authors rigorous peer review, rapid decisions, and high visibility. The editors welcome comprehensive articles, short communications and reviews on both theoretical and experimental work in relation to energy harvesting, conversion, storage and distribution, on topics including but not limited to: -Solar energy conversion -Hydrogen generation -Photocatalysis -Thermoelectric materials and devices -Materials for nuclear energy applications -Materials for Energy Storage -Environment protection -Sustainable and green materials