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Pré-Publication, Document De Travail (Preprint/Prepublication) Année : 2023

Quantum well confinement and competitive radiative pathways in the luminescence of black phosphorus layers

Etienne Carré
  • Fonction : Auteur
Alain Lusson
  • Fonction : Auteur
Ingrid Stenger
  • Fonction : Auteur
Sébastien Roux
  • Fonction : Auteur
Victor Zatko
  • Fonction : Auteur
Bruno Dlubak
  • Fonction : Auteur
Pierre Seneor
  • Fonction : Auteur
Etienne Gaufrès
  • Fonction : Auteur
Annick Loiseau
  • Fonction : Auteur
Julien Barjon

Résumé

Black phosphorus (BP) stands out from other 2D materials by the wide amplitude of the band-gap energy (Eg) that sweeps an optical window from Visible (VIS) to Infrared (IR) wavelengths, depending on the layer thickness. This singularity made the optical and excitonic properties of BP difficult to map. Specifically, the literature lacks in presenting experimental and theoretical data on the optical properties of BP on an extended thickness range. Here we report the study of an ensemble of photoluminescence spectra from 79 passivated BP flakes recorded at 4 K with thicknesses ranging from 4 nm to 700 nm, obtained by mechanical exfoliation. We observe that the exfoliation steps induce additional defects states that compete the radiative recombination from bound excitons observed in the crystal. We also show that the evolution of the photoluminescence energy versus thickness follows a quantum well confinement model appreciable from a thickness predicted and probed at 25 nm. The BP slabs placed in different 2D heterostructures show that the emission energy is not significantly modulated by the dielectric environment.
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Dates et versions

hal-04290268 , version 1 (16-11-2023)

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Etienne Carré, Lorenzo Sponza, Alain Lusson, Ingrid Stenger, Sébastien Roux, et al.. Quantum well confinement and competitive radiative pathways in the luminescence of black phosphorus layers. 2023. ⟨hal-04290268⟩
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