Absorption effect on the cathodoluminescence spectrum of n-GaN
Ceramic Physics Laboratory & Research Institute for Nanoscience, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, 606-8585 Kyoto, Japan
Corresponding author: email@example.com
Accepted: 30 September 2009
Published online: 30 October 2009
The cathodoluminescence spectrum of n-GaN crystal has been studied with emphasis placed on its self-absorption behavior. An improved analysis of cathodoluminescence spectral shift with electron penetration depth is shown, according to the following approach: (i) a main band and a sub-band, both of Gaussian nature, are used for spectral convolution; (ii) the observed absorption edge is still described in terms of the Urbach rule, but the Urbach tail is experimentally retrieved by directly using the absorption spectrum (at low energies) obtained from standard cathodoluminescence spectra; (iii) an experimental approach is used to retrieve the actual morphology of the cathodoluminescence probe.
PACS: 78.55.-m – Photoluminescence, properties and materials / 78.60.Hk – Cathodoluminescence, ionoluminescence / 78.60.-b – Other luminescence and radiative recombination / 25.20.Dc – Photon absorption and scattering
© EDP Sciences, 2009