二硫化钼的振动和光学性质:从单层到块状

IF 8.2 1区 化学 Q1 CHEMISTRY, PHYSICAL
Alejandro Molina-Sánchez , Kerstin Hummer , Ludger Wirtz
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引用次数: 160

摘要

二硫化钼(MoS2)作为一种层状材料最近受到了相当大的关注,其中相邻层之间的相互作用很弱,很容易相互滑动。因此,机械剥离允许单层和多层的制造,并打开了产生具有优异性能的原子薄晶体的可能性。与石墨烯相比,它的光学间隙为~1.9 eV。这使它成为晶体管和光电应用的突出候选者。由于没有层间杂化,单层二硫化钼表现出明显不同于块状二硫化钼的物理性质。例如,块状和多层二硫化钼的带隙是间接的,而随着层数的减少,带隙变为直接的。本文从理论上分析了单层、多层和块状二硫化钼的电子、光学和振动特性。我们特别关注自旋轨道相互作用、层数和施加的拉伸应变对振动和光学性质的影响。我们检查了不同方法获得的结果,主要是从头算方法。我们还讨论了哪种近似适用于二硫化钼和层状材料。研究了外加应变对单层二硫化钼带隙的影响以及间接带隙向直接带隙的交叉。我们分析了激子效应对吸收光谱的影响。给出了吸收阈值双峰和高能激子等主要特征。此外,我们还报道了单层、多层和块状二硫化钼的声子色散关系。基于后者,我们解释了拉曼有源A1g和E2g1模式的行为是层数的函数。最后,我们比较了拉曼光谱、光致发光光谱和光吸收光谱的理论和实验结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Vibrational and optical properties of MoS2: From monolayer to bulk

Molybdenum disulfide, MoS2, has recently gained considerable attention as a layered material where neighboring layers are only weakly interacting and can easily slide against each other. Therefore, mechanical exfoliation allows the fabrication of single and multi-layers and opens the possibility to generate atomically thin crystals with outstanding properties. In contrast to graphene, it has an optical gap of ~1.9 eV. This makes it a prominent candidate for transistor and opto-electronic applications. Single-layer MoS2 exhibits remarkably different physical properties compared to bulk MoS2 due to the absence of interlayer hybridization. For instance, while the band gap of bulk and multi-layer MoS2 is indirect, it becomes direct with decreasing number of layers.

In this review, we analyze from a theoretical point of view the electronic, optical, and vibrational properties of single-layer, few-layer and bulk MoS2. In particular, we focus on the effects of spin–orbit interaction, number of layers, and applied tensile strain on the vibrational and optical properties. We examine the results obtained by different methodologies, mainly ab initio approaches. We also discuss which approximations are suitable for MoS2 and layered materials. The effect of external strain on the band gap of single-layer MoS2 and the crossover from indirect to direct band gap is investigated. We analyze the excitonic effects on the absorption spectra. The main features, such as the double peak at the absorption threshold and the high-energy exciton are presented. Furthermore, we report on the the phonon dispersion relations of single-layer, few-layer and bulk MoS2. Based on the latter, we explain the behavior of the Raman-active A1g and E2g1 modes as a function of the number of layers. Finally, we compare theoretical and experimental results of Raman, photoluminescence, and optical-absorption spectroscopy.

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来源期刊
Surface Science Reports
Surface Science Reports 化学-物理:凝聚态物理
CiteScore
15.90
自引率
2.00%
发文量
9
审稿时长
178 days
期刊介绍: Surface Science Reports is a journal that specializes in invited review papers on experimental and theoretical studies in the physics, chemistry, and pioneering applications of surfaces, interfaces, and nanostructures. The topics covered in the journal aim to contribute to a better understanding of the fundamental phenomena that occur on surfaces and interfaces, as well as the application of this knowledge to the development of materials, processes, and devices. In this journal, the term "surfaces" encompasses all interfaces between solids, liquids, polymers, biomaterials, nanostructures, soft matter, gases, and vacuum. Additionally, the journal includes reviews of experimental techniques and methods used to characterize surfaces and surface processes, such as those based on the interactions of photons, electrons, and ions with surfaces.
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