Second‐Harmonic Spectroscopy for Defects Engineering Monitoring in Transition Metal Dichalcogenides,Advanced Optical Materials

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Second‐Harmonic Spectroscopy for Defects Engineering Monitoring in Transition Metal Dichalcogenides
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-01-11 , DOI: 10.1002/adom.201701327
Henrique G. Rosa ₁ , Lu Junpeng _{1,

2} , Lídia C. Gomes ₁ , Manuel J. L. F. Rodrigues ₁ , Sow Chorng Haur _{1,

2} , José C. V. Gomes ₁

Affiliation

Defects engineering in transition metal dichalcogenides is a topic of intense research recently, since crystal properties can be controlled and tailored during and after fabrication. In this context, defects characterization is key to understand the material structure and enable specific applications. In this work, second‐harmonic generation (SHG) spectroscopy is used to map concentric triangular defective regions in as‐grown monolayer tungsten disulfide, demonstrating that SHG can be used for defects observation and characterization in layered noncentrosymmetric nanomaterials. In monolayer tungsten disulfide, in regions where sulfur atoms are replaced by vacancies, it is observed that the SHG signal experiences an enhancement of two orders of magnitude due to the presence of mid‐gap states. Moreover, SHG is anticorrelated with photoluminescence emission from the material, showing that both techniques can provide complementary information about the crystalline structure. In comparison with other optical characterization techniques, SHG provides fast response, does not depend on real energy transitions, and can be used for defects mapping in several other materials regardless the optical bandgap energy.

中文翻译：

二次谐波光谱法用于过渡金属二硫属元素化物的缺陷工程监测

由于可以在制造过程中和制造后控制和定制晶体特性，因此过渡金属二卤化物中的缺陷工程是近来研究的热点。在这种情况下，缺陷表征是理解材料结构并实现特定应用的关键。在这项工作中，二次谐波（SHG）光谱用于绘制成膜的单层二硫化钨中同心三角形缺陷区域的图，表明SHG可用于层状非中心对称纳米材料中的缺陷观察和表征。在单层二硫化钨中，在硫原子被空位取代的区域中，观察到SHG信号由于存在中间能隙态而经历了两个数量级的增强。而且，SHG与材料的光致发光反相关，表明两种技术都可以提供有关晶体结构的补充信息。与其他光学表征技术相比，SHG提供了快速响应，不依赖于实际的能量跃迁，并且无论光学带隙能量如何，都可以用于其他几种材料中的缺陷映射。

更新日期：2018-01-11

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