模拟寿命谱分析ZnO正电子寿命

o investigate the influence of lifetime spectra decomposition on the positron lifetime of ZnO, positron lifetime spectra of ZnO having defects of Zn vacancy, Zn-vacancy-hydrogen complex, Zn+O divacancy with concentrations from 1015 cm-3 to 1018 cm-3 are simulated. The obtained lifetime spectra is well decomposed into two components even if more than one type of defect exist. The two lifetime components ?tting will yield arti?cial positron lifetime components in more than two type of defect systems. The bulk lifetime model for evaluating the validity of lifetime spectra decomposition alone is not reliable, and will lead to improper interpretation of positron lifetime components. The present work is helpful to analyze controversial positron lifetimes of bulk and vacancies in ZnO from the viewpoint of lifetime data treatment.