Enhanced Optical Absorption and Emission from Monolayer WS2 Integrated Onto a TiO2 Nanohole Array,Advanced Optical Materials

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Enhanced Optical Absorption and Emission from Monolayer WS2 Integrated Onto a TiO2 Nanohole Array
Advanced Optical Materials ( IF 7.2 ) Pub Date : 2024-09-30 , DOI: 10.1002/adom.202402015
Churong Ma _{1,

2} , Xinkuan Li _{1,

2} , Pengfei Huang _{1,

2} , Xinyue Liu _{1,

3} , Jiahao Yan _{1,

3} , Zhaoqiang Zheng ₄ , Jiandong Yao ₅ , Chun Du _{1,

2} , Ying Liu _{1,

2} , Xiangping Li _{1,

2} , Bai‐ou Guan _{1,

2} , Kai Chen _{1,

2}

Affiliation

Monolayer transition metal dichalcogenides (TMDCs) have extensive applications in the field of optics and optoelectronics by virtue of their unique band structures and excitonic properties. Although possessing high absorption coefficient and emission efficiency, they suffer from low optical absorptance due to the atomic scale thickness, which limits their photoluminescence and optoelectronic performance. In spite of intense research efforts on absorption enhancement of monolayer TMDCs by optical cavities, such as plasmonic and all-dielectric nanoresonators, there inevitably exists a competition of absorption between them because of the loss in cavities. Here, strong absorption enhancements of monolayer WS₂ integrated onto a TiO₂ nanohole array fabricated by colloidal lithography are reported. It achieves theoretically a tenfold and experimentally a sixfold enhancement of absorption within monolayer WS₂ near the band edge when TE and TM modes of the TiO₂ nanohole array spectrally overlap with the A exciton. This result can be attributed to the near perfect reflection and near field localization properties of the resonant modes in TiO₂ nanohole arrays. Further, the photoluminescence of monolayer WS₂ is also significantly improved owing to the increased absorption of WS₂ as well as Purcell effect. Such heterostructure paves the way for designing high-efficiency sources, photodetectors, and photovoltaic devices.

中文翻译：

集成到 TiO2 纳米空穴阵列上的单层 WS2 的增强光吸收和发射

单层过渡金属二硫化物（TMDC）凭借其独特的能带结构和激子特性，在光学和光电子领域有着广泛的应用。尽管具有高吸收系数和发射效率，但由于原子尺度厚度，它们的光吸收率较低，这限制了它们的光致发光和光电性能。尽管对光学腔（如等离子体和全介电纳米谐振器）对单层 TMDC 的吸收增强进行了大量研究，但由于腔体中的损失，它们之间不可避免地存在吸收竞争。在这里，报道了通过胶体光刻技术制备的单层 WS₂ 集成到 TiO₂ 纳米空穴阵列上的强吸收增强。当 TiO₂ 纳米空穴阵列的 TE 和 TM 模式在光谱上与 A 激子重叠时，它在理论上实现了在带边缘附近的单层 WS₂ 内的吸收增强 10 倍，实验上实现了 6 倍的吸收增强。这一结果可归因于 TiO₂ 纳米空穴阵列中谐振模式近乎完美的反射和近场定位特性。此外，由于 WS₂ 的吸收增加以及 Purcell 效应，单层 WS₂ 的光致发光也得到了显着改善。这种异质结构为设计高效光源、光电探测器和光伏器件铺平了道路。

更新日期：2024-09-30

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