Charge Transport in Thermoelectric SnSe Single Crystals,ACS Energy Letters

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Charge Transport in Thermoelectric SnSe Single Crystals
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-02-15 00:00:00 , DOI: 10.1021/acsenergylett.7b01259
Min Jin ₁ , Zhiwei Chen ₂ , Xiaojian Tan ₁ , Hezhu Shao ₁ , Guoqiang Liu ₁ , Haoyang Hu ₁ , Jingtao Xu ₁ , Bo Yu ₁ , Hui Shen ₃ , Jiayue Xu ₃ , Haochuan Jiang ₁ , Yanzhong Pei ₂ , Jun Jiang ₁

Affiliation

SnSe has attracted increasing attention as a promising thermoelectric material. In this work, a horizontal vapor transfer method was developed to synthesize high-quality, fully dense, and stoichiometric SnSe single crystals, which enables an evaluation of the transport properties inherent to SnSe along the bc-plane. The electronic transport properties can be well-understood by a single parabolic band model with acoustic phonon scattering, enabling insights into the fundamental material parameters determining the electronic properties. The lattice thermal conductivity (κ_l) decreases from 2.0 W m^–1 K^–1 at 300 K to 0.55 W m^–1 K^–1 at 773 K. It is revealed that an increase in hole concentration, an involvement of low-lying bands for transport, and a further reduction in κ_l would all enable p-type SnSe to be a promising eco-friendly thermoelectric material. This work not only provides a fundamental understanding of the charge transport but also guides the further improvement of thermoelectric SnSe.

中文翻译：

热电SnSe单晶中的电荷传输

SnSe作为一种有前途的热电材料已引起越来越多的关注。在这项工作中，开发了一种水平气相转移方法来合成高质量，完全致密和化学计量的SnSe单晶，从而能够评估SnSe沿bc平面固有的传输特性。带有声子声子散射的单个抛物带模型可以很好地理解电子传输特性，从而洞悉确定电子特性的基本材料参数。晶格热导率（κ_升）从2.0减小脉冲W M ^-1  ķ ^-1在300K〜0.55脉冲W M ^-1  ķ ^-1在773 K.它显露增加空穴浓度，低洼带的运输的参与，并进一步减少在κ_升都会使p型位SnSe是一个有希望的生态友好的热电材料。这项工作不仅提供了电荷传输的基本知识，而且还指导了热电SnSe的进一步改进。

更新日期：2018-02-15

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