Plasmonic Gold Nanorods Coverage Influence on Enhancement of the Photoluminescence of Two-Dimensional MoS2 Monolayer.
Plasmonic Gold Nanorods Coverage Influence on Enhancement of the Photoluminescence of Two-Dimensional MoS2 Monolayer.
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DOI：
10.1038/srep16374
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发表时间：
2015-11-17
影响因子：
4.6
通讯作者：
Chang CW
中科院分区：
文献类型：
--
作者：
Lee KC;Chen YH;Lin HY;Cheng CC;Chen PY;Wu TY;Shih MH;Wei KH;Li LJ;Chang CW
二维过渡金属二硫族化物（TMD）半导体因其优异的光学和电子性能以及在场效应晶体管、发光和传感器件中的潜在应用而受到广泛关注。最近开发了弱二维TMD原子层的表面等离子体增强光致发光（PL）以实现潜在的光电器件。然而，我们注意到增强不会随着金属等离子体物体的增加而单调增加，并且在一定覆盖范围后发射下降。本研究提出了在金 (Au) 纳米棒存在下单层 MoS2 的优化 PL 增强。在单层 MoS2 周围产生的 Au 纳米棒的局域表面等离子体波可以提供与 MoS2 增益光谱重叠的共振波长。局域表面等离子体激元波与 MoS2 发射波之间的空间和光谱重叠极大地增强了 MoS2 单层的光发射。我们给出了一个简单的模型和物理解释来解释这些现象。等离子体金纳米结构方法为提高未来光电器件和系统的二维纳米材料及其器件的发射效率提供了宝贵的途径。
The 2-D transition metal dichalcogenide (TMD) semiconductors, has received great attention due to its excellent optical and electronic properties and potential applications in field-effect transistors, light emitting and sensing devices. Recently surface plasmon enhanced photoluminescence (PL) of the weak 2-D TMD atomic layers was developed to realize the potential optoelectronic devices. However, we noticed that the enhancement would not increase monotonically with increasing of metal plasmonic objects and the emission drop after the certain coverage. This study presents the optimized PL enhancement of a monolayer MoS2 in the presence of gold (Au) nanorods. A localized surface plasmon wave of Au nanorods that generated around the monolayer MoS2 can provide resonance wavelength overlapping with that of the MoS2 gain spectrum. These spatial and spectral overlapping between the localized surface plasmon polariton waves and that from MoS2 emission drastically enhanced the light emission from the MoS2 monolayer. We gave a simple model and physical interpretations to explain the phenomena. The plasmonic Au nanostructures approach provides a valuable avenue to enhancing the emitting efficiency of the 2-D nano-materials and their devices for the future optoelectronic devices and systems.