Time-resolved photoluminescence investigation of (Mg, Zn) O alloy growth on a non-polar plane

Mohammed Jassim Mohammed Ali (1, 2) , J. M. Chauveau (3) , Thierry Bretagnon (1, 2)

1 L2C - Laboratoire Charles Coulomb
2 PEPS - Physique de l'Exciton, du Photon et du Spin
3 CRHEA - Centre de recherche sur l'hétéroepitaxie et ses applications

Excitons recombination dynamics in ZnMgO alloy have been studied by time-resolved photoluminescence according to temperature. At low temperature, localization effects of the exciton are found to play a significant role. The photoluminescence (PL) decays are bi-exponential. The short lifetime has a constant value, whereas the long lifetime shows a dependency with temperature. For temperature higher than 100 K the declines show an mono-exponential decay. The PL declines are dominated by non-radiative process at temperatures above 150 K. The PL lifetime dependancy with temperature is analysed using a model including localisation effects and non-radiative recombinations.

Mots clés: (Mg; Zn)O; ZnO; Exciton; Optical properties; Nonpolar; Alloy

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Mohammed Jassim Mohammed Ali, J. M. Chauveau, Thierry Bretagnon. Time-resolved photoluminescence investigation of (Mg, Zn) O alloy growth on a non-polar plane. Superlattices and Microstructures, 2018, 116, pp.105-113. ⟨10.1016/j.spmi.2018.02.001⟩. ⟨hal-01827268⟩