Excitons in bulk black phosphorus evidenced by photoluminescence at low temperature
| Autor: | I. Stenger, Lorenzo Sponza, Annick Loiseau, Julien Barjon, Etienne Gaufrès, Etienne Carré, Alain Lusson |
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| Přispěvatelé: | LEM, UMR 104, CNRS-ONERA, Université Paris-Saclay (Laboratoire d'étude des microstructures), ONERA-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Groupe d'Etude de la Matière Condensée (GEMAC), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS), DMAS, ONERA, Université Paris Saclay [Châtillon], ONERA-Université Paris-Saclay, Laboratoire Photonique, Numérique et Nanosciences (LP2N), Université de Bordeaux (UB)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), ANR-17-CE24-0023,EPOS-BP,Electroluminescence en spin polarisés dans les couches minces de phosphore noir(2017), European Project: 785219,H2020,GrapheneCore2(2018), European Project: 881603,H2020,H2020-SGA-FET-GRAPHENE-2019, GrapheneCore3(2020) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Photoluminescence Infrared Band gap Exciton Binding energy FOS: Physical sciences 02 engineering and technology Activation energy 01 natural sciences Molecular physics Condensed Matter::Materials Science Impurity Computer Science::Systems and Control Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences General Materials Science 010306 general physics Quenching Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter::Other Mechanical Engineering Materials Science (cond-mat.mtrl-sci) General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 3. Good health Mechanics of Materials [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] 0210 nano-technology Optics (physics.optics) Physics - Optics |
| Zdroj: | 2D Materials 2D Materials, IOP Publishing, 2021, 8 (2), pp.021001. ⟨10.1088/2053-1583/abca81⟩ 2D Materials, 2021, 8 (2), pp.021001. ⟨10.1088/2053-1583/abca81⟩ |
| ISSN: | 2053-1583 0021-4922 0143-0807 |
| DOI: | 10.1088/2053-1583/abca81⟩ |
| Popis: | 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. 12 pages, 3 figures - Main text 13 pages, 6 figures - Supporting information |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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