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首页> 外文期刊>Physical review >Excitons in one-dimensional van der Waals materials: Sb_2S_3 nanoribbons
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Excitons in one-dimensional van der Waals materials: Sb_2S_3 nanoribbons

机译：一维范德华材料中的激子：Sb_2S_3纳米带

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摘要

Antimony sulphide Sb_2S3_ has emerged as a promising material for a variety of energy applications ranging from solar cells to thermoelectrics and solid-state batteries. The most distinctive feature of Sb_2S3_ is its crystal structure, which consists of parallel 1-nm-wide ribbons held together by weak van der Waals forces. This structure clearly suggests that it should be possible to isolate individual Sb_2S3_ ribbons using micromechanical or liquid-phase exfoliation techniques. However, it is not clear yet how to identify the ribbons postexfoliation using standard optical probes. Using state-of-the-art first-principles calculations based on many-body perturbation theory, here we show that individual ribbons of Sb_2S3_ carry optical signatures clearly distinct from those of bulk Sb_2S_3. In particular, we find a large blueshift of the optical absorption edge (from 1.38 to 2.30 eV) resulting from the interplay between a reduced screening and the formation of bound excitons. In addition, we observe a transition from an indirect band gap to a direct gap, suggesting an enhanced photoluminescence in the green. These unique fingerprints will enable extending the research on van der Waals materials to the case of one-dimensional chalchogenides.
机译：硫化锑Sb_2S3_已成为一种有前途的材料，可用于从太阳能电池到热电和固态电池的各种能源应用中。 Sb_2S3_的最显着特征是其晶体结构，该结构由弱范德华力将1nm宽的平行带保持在一起。这种结构清楚地表明，应该有可能使用微机械或液相剥离技术分离单个Sb_2S3_碳带。然而，目前尚不清楚如何使用标准光学探针在剥离后识别色带。使用基于多体扰动理论的最新第一原理计算，在这里我们显示Sb_2S3_的各个条带带有明显不同于块状Sb_2S_3的光学带。特别是，我们发现光吸收边缘的大蓝移（从1.38 eV到2.30 eV）是由于减少的筛选和结合的激子的形成之间的相互作用所致。另外，我们观察到从间接带隙到直接带隙的过渡，表明绿色的光致发光增强。这些独特的指纹将使对范德华材料的研究扩展到一维硫属杀菌剂的情况。

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