Authors
Mickaël Gilliot, Aomar Hadjadj, Jérôme Martin,
Title
Luminescence and ellipsometry investigations of annealing effects on nano-granular ZnO.
In
Journal of Luminescence
Volume
192
Pages
25–32
Publisher
Elsevier
Year
2017
Publisher's URL
http://www.sciencedirect.com/science/article/pii/S0022231317302442
Indexed by
Abstract
We propose an investigation of nano-granular ZnO very thin layers View the MathML source , which morphologies are varied by changing the annealing temperature between 300 and 650° C. A detailed investigation of the optical properties is performed by coupling emission obtained from photoluminescence and dielectric function obtained from spectroscopic ellipsometry. The dielectric function shows a strong excitonic behavior increasing with annealing temperature. The UV emission is optimal at 450° C and the defect related visible bands gradually increase with annealing temperature. A particular attention is paid on i) the blueshift between emission and absorption UV onsets which is analyzed using contribution such as phonon replicas, carriers, bandgap renormalization, band filling and non-parabolicity; ii) the correlated evolution of absorption and emission intensities which is analyzed in terms of simultaneous curing of morphological defects and activation of intrinsic defects with temperature.
Affiliations
Offprint