Journal
APPLIED SURFACE SCIENCE
Volume 504, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.144252
Keywords
Surface plasmon; WS2; Photoluminescence; Raman; Ag nanoprism
Categories
Funding
- National Natural Science Foundation of China [61704040, 61674124, 61505172, 61675173]
- Zhejiang Provincial Natural Science Foundation of China [LGG19F040003]
- Key Research and Development Plan Project of Zhejiang Province [2018C01036, 2019C04003]
- Key Laboratory Fund Project of Science and Technology on Micro-system Laboratory [614280401010317]
- Fundamental Research Funds for the Central Universities [20720170019]
- Outstanding Youth Foundation Project of Jiujiang [2018042]
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Monolayer transition metal dichalcogenides (TMDs) usually have weak optical emission due to the poor light absorption as being atomically thin. Enhancing their optical properties by surface plasmon resonance is attractive for applying atomically thin TMDs in optoelectronic and photonic devices. Here, Ag/WS2 hybrid structure was fabricated by transferring monolayer WS2 grown via chemical vapor deposition (CVD) onto optimized periodic Ag nanoprism array with well-matched resonance by controlling the mask geometry and etching time of polystyrene (PS) nanospheres. Significant enhanced photoluminescence (PL) emission and Raman scattering were successfully achieved. Especially, the higher enhancement is realized for neutral excitons of monolayer WS2. Theoretical calculations reveal that the plasmonic enhancement mainly results from the highly enhanced local electric field and the charge transfer. This work explores the feasibility of exciton emission and Raman scattering enhancement for TMDs with plasmonic nanostructures fabricated by low-cost and easily-manipulated nanosphere lithography (NSL), which paves a way towards the applications of plasmon-enhanced TMD sensors, emitters, and photodetectors.
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