Giant second harmonic generation in bulk monolayer MoS2 thin films

IF 17.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Matter Pub Date : 2024-07-03 DOI:10.1016/j.matt.2024.04.043

Boxuan Zhou , Jin Ho Kang , Bangyao Hu , Jingyuan Zhou , Huaying Ren , Jingxuan Zhou , Dehui Zhang , Ao Zhang , Shuanghao Zheng , Chee Wei Wong , Yu Huang , Xiangfeng Duan

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Abstract

Monolayer molybdenum disulfide (MoS₂) features exceptional second-order nonlinear optical (NLO) susceptibility, while being atomically thin limits its efficiency in second harmonic generation (SHG). The naturally existing 2H-phase MoS₂ may offer a larger optical cross section in its bulk form but is inactive for SHG due to the restored centrosymmetry. Here, we report a thickness- and area-scalable bulk monolayer MoS₂ (BM-MoS₂) thin film for highly efficient SHG. The solution-assembled centimeter-scale BM-MoS₂ consists of alternating monolayer MoS₂ crystals and organic molecular layers that prevent interlayer coupling, thus preserving monolayer-like physical properties while achieving increased optical cross sections. The SHG studies demonstrate a giant SHG in BM-MoS₂ that is 126 times higher than monolayer MoS₂ and 21 times higher than gallium arsenide (GaAs), a material with the highest second-order NLO susceptibility among known bulk semiconductors. The facile assembly of BM-MoS₂ thin films with efficient SHG offers a scalable pathway for developing ultrathin, efficient, and cost-effective NLO devices.

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块状单层 MoS2 薄膜中的巨大二次谐波生成

单层二硫化钼（MoS2）具有非凡的二阶非线性光学（NLO）感性，而原子厚度却限制了其二次谐波发生（SHG）的效率。天然存在的 2H 相 MoS2 在其块体形式下可提供更大的光学截面，但由于恢复了中心对称性，因此在 SHG 中并不活跃。在此，我们报告了一种厚度和面积可扩展的体单层 MoS2（BM-MoS2）薄膜，可用于高效 SHG。溶液组装的厘米级 BM-MoS2 由交替的单层 MoS2 晶体和有机分子层组成，可防止层间耦合，从而在实现更大光学截面的同时保持类似单层的物理特性。SHG 研究表明，BM-MoS2 中的巨型 SHG 比单层 MoS2 高 126 倍，比砷化镓（GaAs）高 21 倍。具有高效 SHG 的 BM-MoS2 薄膜的简易组装为开发超薄、高效和高成本效益的 NLO 器件提供了一条可扩展的途径。

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来源期刊

Matter MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

26.30

自引率

2.60%

发文量

367

期刊介绍： Matter, a monthly journal affiliated with Cell, spans the broad field of materials science from nano to macro levels,covering fundamentals to applications. Embracing groundbreaking technologies,it includes full-length research articles,reviews, perspectives,previews, opinions, personnel stories, and general editorial content. Matter aims to be the primary resource for researchers in academia and industry, inspiring the next generation of materials scientists.