Monolayer Excitonic Semiconductors Integrated with Au Quasi-Periodic Nanoterrace Morphology on Fused Silica Substrates for Light-Emitting Devices
Monolayer Excitonic Semiconductors Integrated with Au Quasi-Periodic Nanoterrace Morphology on Fused Silica Substrates for Light-Emitting Devices
复制标题
用于发光器件的熔融石英衬底上与金准周期纳米晶形态集成的单层激子半导体
DOI：
10.1021/acsanm.0c02386
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发表时间：
2021-01-22
影响因子：
5.9
通讯作者：
Liu, Ying
中科院分区：
文献类型：
--
作者：
Chen, Yuheng;Li, Han;Liu, Ying
二维过渡金属二卤代化合物(TMD)由于其独特的光电性质，如大的激子结合能和载流子迁移率，在纳米光子学领域具有广阔的应用前景。其中，单层TMDs通过利用微/纳米结构的表面等离子体激元(SPP)模式表现出增强的光致发光(PL)。在这项工作中，我们提出了一种独特的技术，通过在熔融二氧化硅衬底上将MoS2单分子膜集成到具有梯度周期的金准周期纳米梯形结构中来实现实质性的发光增强。通过低成本、快速的离子轰击、铁共沉积和镀金技术制备了金准周期纳米结构，并利用聚合物辅助技术沉积了单分子膜。我们的结果表明，由于准周期纳米阶梯形态产生的SPP模，发光得到了增强。对具有不同激光偏振、不同形貌周期和不同温度的单层薄片进行了全面的光谱研究，以提供对发光增强背后的机理的详细了解。结合数值模拟，我们的结果为理解发光增强效应提供了基础，并为基于TMD单分子膜的二极管、激光器和异质结太阳能电池等高效率发光器件的未来发展指明了方向。
Two-dimensional transition metal dichalcogenides (TMDs) have a promising future in the nanophotonics field due to Fr their unique optoelectronic properties such as large exciton binding energies and carrier mobility. Among these properties, monolayer TMDs exhibit enhanced photoluminescence (PL) by utilizing micro-/nanostructure surface plasmon polariton (SPP) modes. In this work, we present a unique technique to achieve substantial PL enhancement by integrating MoS2 monolayers to gold quasi-periodic nanoterrace morphology with gradient periods on fused silica substrates. Gold quasi-periodic nanostructures were fabricated through cost-effective and fast ion bombardment with iron co-deposition followed by a gold coating technique, and monolayers were deposited by a polymer-assisted technique. Our results show clear evidence that the light emission is enhanced due to the SPP modes produced by the quasi-periodic nanoterrace morphology. Comprehensive spectroscopy studies were performed on monolayer flakes with different laser polarizations, morphology periods, and temperatures to offer detailed insights on the mechanism behind PL enhancement. Together with numerical simulations, our results provided a basis for understanding the PL enhancement effects and shed light on future directions of high-efficiency light-emitting devices such as diodes, lasers, and heterostructure solar cells based on TMD monolayers.