Giant longitudinal and transverse magnetothermoelectric effects in a van del Waals semimetal TaCo2Te2,Energy & Environmental Science

当前位置： X-MOL 学术 › Energy Environ. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Giant longitudinal and transverse magnetothermoelectric effects in a van del Waals semimetal TaCo2Te2
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2024-08-14 , DOI: 10.1039/d4ee01857e
Zhigang Gui ₁ , Ye Yang ₁ , Xikai Wen ₁ , Yuqing Zhang ₁ , Yikang Li ₁ , Yanjun Li ₁ , Qingyuan Liu ₁ , Mingjie Wang ₂ , Jianjun Ying _{1,

3} , Xianhui Chen _{1,

2,

3,

4}

Affiliation

Nowadays, thermoelectric (TE) cooling technologies are hindered by the paucity of efficient low-temperature TE materials, which are critical to both cryogenic research and practical applications. Herein, we present the discovery of a flexible van der Waals semimetal TaCo₂Te₂, which exhibits exceptional TE performance in both the longitudinal and transverse directions. The transverse power factor reaches an unsaturated ultrahigh value, 25 680 μW m⁻¹ K⁻², under 13.5 T at 20 K, surpassing the performance of most transverse TE materials. Two longitudinal power factor peaks are observed, dominated by different carriers, with the highest recorded values of 11 600 μW m⁻¹ K⁻² at 20 K in the electron-dominant region and 2200 μW m⁻¹ K⁻² at 120 K in the hole-dominant region without magnetic field. This outstanding TE performance can be attributed to high mobility and the phonon drag effect, underscoring TaCo₂Te₂ as a promising material candidate for low-temperature solid-state cooling applications within TE technology.

中文翻译：

范德尔华半金属 TaCo2Te2 中的巨大纵向和横向磁热电效应

如今，热电 (TE) 冷却技术因缺乏高效低温 TE 材料而受到阻碍，而高效低温 TE 材料对于低温研究和实际应用都至关重要。在此，我们发现了一种柔性范德华半金属 TaCo ₂ Te ₂ ，它在纵向和横向上都表现出卓越的 TE 性能。横向功率因数在20 K、13.5 T下达到不饱和超高值25 680 μW m ^-1 K ^-2 ，超越了大多数横向TE材料的性能。观察到两个由不同载流子主导的纵向功率因数峰值，电子主导区20 K时的最高记录值为11 600 μW m ^-1 K ^-2 ，电子主导区120 K时的最高记录值为2200 μW m ^-1 K ^-2 。没有磁场的空穴主导区域。这种出色的 TE 性能可归因于高迁移率和声子拖曳效应，强调 TaCo ₂ Te ₂作为 TE 技术中低温固态冷却应用的有前途的候选材料。

更新日期：2024-08-14

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南