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Preprints, Working Papers, ... Year : 2023

Electroluminescence of the graphene 2D semi-metal

T. Taniguchi
  • Function : Author
K. Watanabe
  • Function : Author
E. Baudin
  • Function : Author

Abstract

Electroluminescence, a non-thermal radiative process, is ubiquitous in semi-conductors and insulators but fundamentally precluded in metals. We show here that this restriction can be circumvented in high-quality graphene. By investigating the radiative emission of semi-metallic graphene field-effect transistors over a broad spectral range, spanning the near- and mid-infrared, we demonstrate direct far-field electroluminescence from hBN-encapsulated graphene in the mid-infrared under large bias in ambient conditions. Through a series of test experiments ruling out its incandescence origin, we determine that the electroluminescent signal results from the electrical pumping produced by interband tunneling. We show that the mid-infrared electroluminescence is spectrally shaped by a natural quarter-wave resonance of the heterostructure. This work invites a reassessment of the use of metals and semi-metals as non-equilibrium light emitters, and the exploration of their intriguing specificities in terms of carrier injection and relaxation, as well as emission tunability and switching speed.
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Dates and versions

hal-04253099 , version 1 (21-10-2023)
hal-04253099 , version 2 (04-11-2023)

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A. Schmitt, L. Abou-Hamdan, M. Tharrault, S. Rossetti, D. Mele, et al.. Electroluminescence of the graphene 2D semi-metal. 2023. ⟨hal-04253099v2⟩
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