期刊
NATURE NANOTECHNOLOGY
卷 15, 期 4, 页码 283-+出版社
NATURE RESEARCH
DOI: 10.1038/s41565-020-0644-2
关键词
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资金
- Agence Nationale de la Recherche [H2DH ANR-15-CE24-0016, 2D-POEM ANR-18-ERC1-0009]
- LabEx NIE [ANR-11-LABX-0058-NIE]
- EUR NanoX [VWspin, MILO]
Interfacing TMD monolayers with graphene enables the demonstration of bright, single and narrow-line photoluminescence arising solely from TMD neutral excitons. Atomically thin semiconductors made from transition metal dichalcogenides (TMDs) are model systems for investigations of strong light-matter interactions and applications in nanophotonics, optoelectronics and valleytronics. However, the photoluminescence spectra of TMD monolayers display a large number of features that are particularly challenging to decipher. On a practical level, monochromatic TMD-based emitters would be beneficial for low-dimensional devices, but this challenge is yet to be resolved. Here, we show that graphene, directly stacked onto TMD monolayers, enables single and narrow-line photoluminescence arising solely from TMD neutral excitons. This filtering effect stems from complete neutralization of the TMD by graphene, combined with selective non-radiative transfer of long-lived excitonic species to graphene. Our approach is applied to four tungsten- and molybdenum-based TMDs and establishes TMD/graphene heterostructures as a unique set of optoelectronic building blocks that are suitable for electroluminescent systems emitting visible and near-infrared photons at near THz rate with linewidths approaching the homogeneous limit.
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