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Plasmon damping and charge transfer pathways in Au@MoSe2 nanostructures

I. Abid 1 P. Benzo 2 B. Pécassou 2 S. Jia 3 J. Zhang 3 J. Yuan 3 Jean Baptiste B Dory 4 Olivier Gauthier-Lafaye 4 Renaud Péchou 1 Adnen Mlayah 4 J. Lou 3 
1 CEMES-NeO - Nano-Optique et Nanomatériaux pour l'optique
CEMES - Centre d'élaboration de matériaux et d'études structurales
2 CEMES-SINanO - Surfaces, Interfaces et Nano-Objets
CEMES - Centre d'élaboration de matériaux et d'études structurales
4 LAAS-PHOTO - Équipe Photonique
LAAS - Laboratoire d'analyse et d'architecture des systèmes
Abstract : Hybridization of plasmonic and excitonic elementary excitations provides an efficient mean of enhancing the optical absorption and emission properties of metal/semiconductor nanostructures and is a key concept for the design of novel efficient optoelectronic devices. Here we investigate the optical properties of two-dimensional MoSe 2 quantum well flakes covered with Au nanoparticles supporting plasmonic resonances. Using spatially resolved confocal spectroscopy, we report the observation of a quenching phenomenon of the Raman scattering and photoluminescence emission of both the MoSe 2 layer and the Au nanoparticles. We found that the quenching of the photoluminescence emission from the Au nanoparticles is partial and measurable unlike the one observed for the Au-covered MoSe 2 layers, which is total. Its dependence on the thickness of the MoSe 2 layer is determined experimentally. Based on electrodynamics calculations and on the electronic band alignment at the Au/MoSe 2 interface, the results are interpreted in terms of (1) damping of the plasmonic resonance of the Au nanoparticles due to the optical absorption by the MoSe 2 layer and (2) a two-pathways charge transfer scheme where the photoexcited electrons leak from the MoSe 2 layer to the Au NPs, whereas the photoexcited holes flow in the opposite direction, that is, from the Au NPs to the MoSe 2 layer. The two combined mechanisms account well for the experimental observations and complements the interpretations proposed in the literature for similar metal nanoparticles/transition metal dichalcogenide systems.
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Submitted on : Monday, October 11, 2021 - 1:58:15 PM
Last modification on : Monday, July 4, 2022 - 8:41:36 AM
Long-term archiving on: : Wednesday, January 12, 2022 - 7:22:09 PM

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I. Abid, P. Benzo, B. Pécassou, S. Jia, J. Zhang, et al.. Plasmon damping and charge transfer pathways in Au@MoSe2 nanostructures. Materials Today Nano, Elsevier, 2021, 15, pp.100131. ⟨10.1016/j.mtnano.2021.100131⟩. ⟨hal-03369174⟩

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