2019/08/31 by Étienne Lorchat, Etienne Lorchat, Luis Enrique Parra López +9
Materials Science · Physics and Astronomy · #2D Materials and Applications #Graphene #Graphene research and applications #Materials science #Nanotechnology #Optoelectronics #Photoluminescence #Physics #Quantum Dots Synthesis And Properties #Quantum mechanics #Semiconductor #Spectral line #cond-mat.mes-hall #cond-mat.mtrl-sci #physics.optics
paper · pdf · doi:10.1038/s41565-020-0644-2
published as Nature Nanotechnology 15, 283(2020) · Main manuscript with 5 figures plus supplementary information file (including 9 supplementary sections and 14 supplementary figures)
openalex publication_date 2020/03/09 · arxiv created 2020/11/05 · arxiv updated 2020/11/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Atomically thin semiconductors made from transition metal dichalcogenides (TMDs) are model systems for investigations of strong light-matter interactions and applications in nanophotonics, opto-electronics and valley-tronics. 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 opto-electronic building blocks, suitable for electroluminescent systems emitting visible and near-infrared photons at near THz rate with linewidths approaching the lifetime limit.