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Article Dans Une Revue 2D Materials Année : 2021

Excitons in bulk black phosphorus evidenced by photoluminescence at low temperature

Résumé

Atomic layers of Black Phosphorus (BP) present unique opto-electronic properties dominated by a direct tunable bandgap in a wide spectral range from visible to mid-infrared. In this work, we investigate the infrared photoluminescence of BP single crystals at very low temperature. Near-bandedge recombinations are observed at 2 K, including dominant excitonic transitions at 0.276 eV and a weaker one at 0.278 eV. The free-exciton binding energy is calculated with an anisotropic Wannier-Mott model and found equal to 9.1 meV. On the contrary, the PL intensity quenching of the 0.276 eV peak at high temperature is found with a much smaller activation energy, attributed to the localization of free excitons on a shallow impurity. This analysis leads us to attribute respectively the 0.276 eV and 0.278 eV PL lines to bound excitons and free excitons in BP. As a result, the value of bulk BP bandgap is refined to 0.287 eV at 2K.
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Dates et versions

hal-03049496 , version 1 (09-12-2020)

Identifiants

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E Carré, L Sponza, A Lusson, I Stenger, Étienne Gaufrès, et al.. Excitons in bulk black phosphorus evidenced by photoluminescence at low temperature. 2D Materials, 2021, 8 (2), pp.021001. ⟨10.1088/2053-1583/abca81⟩. ⟨hal-03049496⟩
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