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Condensed Matter > Materials Science

arXiv:1306.2850 (cond-mat)
[Submitted on 12 Jun 2013 (v1), last revised 6 Feb 2014 (this version, v2)]

Title:Excitonic recombinations in hBN: from bulk to exfoliated layers

Authors:Aurélie Pierret (LEM, CEA/INAC/SP2M), Jorge Loayza (LEM, GEMAC), Bruno Berini (GEMAC), Andreas Betz (LPA), Bernard Plaçais (LPA), François Ducastelle (LEM), Julien Barjon (GEMAC), Annick Loiseau (LEM)
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Abstract:Hexagonal boron nitride (h-BN) and graphite are structurally similar but with very different properties. Their combination in graphene-based devices meets now a huge research focus, and it becomes particularly important to evaluate the role played by crystalline defects in them. In this work, the cathodoluminescence (CL) properties of hexagonal boron nitride crystallites are reported and compared to those of nanosheets mechanically exfoliated from them. First the link between the presence of structural defects and the recombination intensity of bound-excitons, the so-called D series, is confirmed. Low defective h-BN regions are further evidenced by CL spectral mapping (hyperspectral imaging), allowing us to observe new features in the near-band-edge region, tentatively attributed to phonon replica of exciton recombinations. Second the h-BN thickness was reduced down to six atomic layers, using mechanical exfoliation, as evidenced by atomic force microscopy. Even at these low thicknesses, the luminescence remains intense and exciton recombination energies are not strongly modified with respect to the bulk, as expected from theoretical calculations indicating extremely compact excitons in h-BN.
Subjects: Materials Science (cond-mat.mtrl-sci)
Cite as: arXiv:1306.2850 [cond-mat.mtrl-sci]
  (or arXiv:1306.2850v2 [cond-mat.mtrl-sci] for this version)
  https://doi.org/10.48550/arXiv.1306.2850
arXiv-issued DOI via DataCite
Journal reference: Physical Review B (Condensed Matter) 89 (2014) 035414
Related DOI: https://doi.org/10.1103/PhysRevB.89.035414
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Submission history

From: Francois Ducastelle [view email] [via CCSD proxy]
[v1] Wed, 12 Jun 2013 14:56:00 UTC (353 KB)
[v2] Thu, 6 Feb 2014 15:38:51 UTC (367 KB)
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