Evidence of exciton complexes in non polar ZnO (Zn, Mg) O A-plane quantum well.
Résumé
Excitons complexes in ZnO/(Zn, Mg)O non-polar quantum well have been studied by using
continuous-wave photoluminescence according to temperature and to the density of excitation.
The spectrum of photoluminescence of the quantum well consists of three di
ff
erent lines. The
ratio between the intensities of these lines depends of the temperature but also of the density of
excitation. The lines are attributed to the free exciton, the negatively charged trion and the
biexciton. The binding energy of trion and biexciton are found to be respectively 19.5 ± 2 meV
and 45 ± 5 meV.