ESR and photo-ESR investigations of the V0+ centre in ZnO raw material and Li-doped ZnO ceramic powder

Abstract

ESR and photo-ESR measurements of the V centre are performed to determine the charge states of the oxygen vacancies in ZnO raw material and Li-doped ZnO ceramics. The temperature dependence of the relative ESR intensity and the optical excitation of the ESR signal of the V centre are investigated. The results show, that in both samples the oxygen vacancies exist in the V and V state only. The ionization energy of the V centre is determined by analysing the decay of the intensity of the V signal after turning off the optical excitation.