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Etude des propriétés optiques du nitrure de bore hexagonal et des nanotubes de nitrure de bore

Abstract : Since several years, optical properties of semiconductors, and especially of UV emitting materials, have been extensively studied because of their potential use in optoelectronics. In that purpose, studying optical properties of hexagonal boron nitride (hBN) and boron nitride nanotubes is of particular interest since they are both wide band gap semiconductors (~6 eV).
The purpose of this work is to analyze the optical properties of these materials and, more precisely, their excitonic effects by developing optical characterization methods dedicated to observe UV emissions.
The experimental techniques we have developed (photoluminescence and cathodoluminescence) have allowed us understanding luminescence properties of hBN. Thus, we have observed free excitonic emissions at 5.77 eV. Then, a correlation of these optical measurements with structural analyses of individual hBN crystallites in transmission electron microscopy has pointed out the existence of excitons bound to well-identified structural defects and emitting around 5.5 eV. After the analysis of hBN optical properties, we have performed the same type of experiments on multiwall BN nanotubes. For the first time, such measurements have shown that these nano-objects also emit in the UV range. Based on our previous study of hBN luminescence properties, we interpretate the origin of the BN nanotubes UV light emissions.
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Contributor : Périne Jaffrennou <>
Submitted on : Friday, December 5, 2008 - 1:57:04 PM
Last modification on : Friday, June 26, 2020 - 2:01:07 PM
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  • HAL Id : tel-00344654, version 1



Périne Jaffrennou. Etude des propriétés optiques du nitrure de bore hexagonal et des nanotubes de nitrure de bore. Matière Condensée [cond-mat]. École normale supérieure de Cachan - ENS Cachan, 2008. Français. ⟨tel-00344654⟩



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