Abstract
AbstractWe review the recent progress regarding the physics and applications of boron nitride bulk crystals and its epitaxial layers in various fields. First, we highlight its importance from optoelectronics side, for simple devices operating in the deep ultraviolet, in view of sanitary applications. Emphasis will be directed towards the unusually strong efficiency of the exciton–phonon coupling in this indirect band gap semiconductor. Second, we shift towards nanophotonics, for the management of hyper-magnification and of medical imaging. Here, advantage is taken of the efficient coupling of the electromagnetic field with some of its phonons, those interacting with light at 12 and 6 µm in vacuum. Third, we present the different defects that are currently studied for their propensity to behave as single photon emitters, in the perspective to help them becoming challengers of the NV centres in diamond or of the double vacancy in silicon carbide in the field of modern and developing quantum technologies.
Highlights
We review the recent progress regarding the physics and applications of boron nitride bulk crystals and its epitaxial layers in various fields
In the area of the spectroscopy of monolayer transition metal dichalchogenides, some recent papers [104, 105] indicate the co-existence of several kinds of phononassisted transitions which involve phonon at specific points of the Brillouin zone, which is in the spirit and in the continuation of what we found earlier in bulk hexagonal boron nitride (hBN) [106]
Most of the optical experiments have been carried out, the Poynting vector of the exciting and collected photons being collinear or almost collinear to the high symmetry axis of hBN, that is to say with Poynting vector orthogonal to the reticular plane (0001)
Summary
Unexpected and incredible potentialities of hexagonal boron nitride (hBN) currently constitute the driving forces for its worldwide booming of interest in most of the advanced research laboratories studying the solid state and its applications. The thermal conductivity of hBN is very high [4,5,6], and it has stimulated modelling using semi-classical [4, 6,7,8] and quantum approaches [9, 10] It is fully understood and hBN is widely used for thermal management issues [11] in miniaturized devices or for thermoelectric applications [12]. HBN is a good host crystal for neutron detection, and the performances of such detectors can be even enhanced if using B 10 monoisotopically purified boron, which is abundant in reasonable proportions in nature (20 per cent of natural B) [15] The reasons for this enhancement are correlated to the interactions of neutrons with B 10 atoms with a cross section of 3835 barns to be compared with 0.0055 barns for 11B. There are two boron neutron capture fission reactions possible with different probabilities of occurrence: B
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.