Article ID Journal Published Year Pages File Type
1616807 Journal of Alloys and Compounds 2011 8 Pages PDF
Abstract

The electronic structure of InGaN epitaxial layers grown on sapphire substrates was studied using X-ray absorption at the In L3 and N K edges, as well as N Kα X-ray emission. Knowing that the InGaN crystallizes in an anisotropic wurtzite structure, the linear polarization of synchrotron radiation was exploited to estimate the influence of the crystal structure anisotropy on the distribution of the local density of states at the site of In and N. The calculated partial density of states describes the observed anisotropy in the measured spectra. Influence of the core–hole effect on the analyzed absorption spectra was verified and reveal that a core hole potential is effectively screened by the surface mobile electrons for the sample with maximum indium content. The bandgap values were provided for the investigated InGaN alloys and were found to vary preudo-lineary with indium content.

► The XANES measurements were done with taking into account polarization effect of SR ► Influence of the core–hole effect on the analyzed absorption spectra was verified ► The bandgap values for the InGaN alloys were found to vary preudo-lineary with xIn.

Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
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