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Nanometric Resolved Luminescence in h-BN Flakes: Excitons and Stacking Order

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  • Nanometric Resolved Luminescence in h-BN Flakes: Excitons and Stacking Order
Author
Romain Bourrellier
Michele Amato
Luiz Tizei
Christine Giorgetti
Alexandre Gloter
Malcolm Heggie
Katia March
Odile Stéphan
Lucia Reining
Mathieu Kociak
A. Zobelli
Keywords
paper
Abstract

The strong excitonic emission of hexagonal boron nitride (h-BN) makes this material one of the most promising candidate for light emitting devices in the far ultraviolet (UV). However, single excitons occur only in perfect monocrystals that are extremely hard to synthesize, while regular h-BN samples present a complex emission spectrum with several additional peaks. The microscopic origin of these additional emissions has not yet been understood. In this work we address this problem using an experimental and theoretical approach that combines nanometric resolved cathodoluminescence, high resolution transmission electron microscopy and state of the art theoretical spectroscopy methods. We demonstrate that emission spectra are strongly inhomogeneus within individual few layer flakes and that additional excitons occur at structural deformations, such as faceted plane folds, that lead to local changes of the h-BN layers stacking order.

Year of Publication
2014
Journal
ACS Photonics
Volume
1
Number of Pages
857-862
URL
http://dx.doi.org/10.1021/ph500141j
DOI
10.1021/ph500141j
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