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Luminescence and ellipsometry investigations of annealing effects on nano-granular ZnO.

Abstract : We propose an investigation of nano-granular ZnO very thin layers ( 100 nm ), 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.
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Submitted on : Tuesday, November 26, 2019 - 4:38:20 PM
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Mickaël Gilliot, Aomar Hadjadj, Jérôme Martin. Luminescence and ellipsometry investigations of annealing effects on nano-granular ZnO.. Journal of Luminescence, Elsevier, 2017, 192, pp.25-32. ⟨10.1016/j.jlumin.2017.06.017⟩. ⟨hal-02381565⟩



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