Near-band edge optical properties of exfoliated h-BN layers.

Abstract : Luminescence properties of h-BN are governed, in the energy range 5.5 { 6 eV, by strong Frenkel-type excitonic e ects, highly sensitive to structural defects [1-3]. Nowadays, BN meets a growing interest for graphene engineering. It is therefore highly desirable to better know optical and electronic properties of thin layers, in correlation with their structural properties. We carry out optical and structural characterizations of this material by combining CL at 4K in the UV range and TEM. Thin layers are obtained by mechanically exfoliating powders and single crystals and reported on SiO2 substrates for AFM thickness measurements, and then on TEM grids. As for the reference bulk, excitonic emission consists of two series of lines called S and D. Thanks to the CL and TEM imaging capabilities, emission related to D lines, is found to be localized on defects, identi ed as grain boundaries. Their energies are found to be upshifted as the number of layers decreases, indicating a perturbation in the exciton localization, which will be discussed.
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J. Loyza, J. Barjon, A. Pierret, A. Betz, B. Placais, et al.. Near-band edge optical properties of exfoliated h-BN layers.. Graphene 2013, Apr 2013, BILBAO, Spain. ⟨hal-01059516⟩

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