9:45 AM - 10:00 AM
▲ [15a-D311-4] Cathodoluminescence study of oxygen vacancy migration along dislocation in SrTiO3
Keywords:Cathodoluminescence, Oxygen vacancy, SrTiO3
Oxygen vacancies behave as n-type dopants in SrTiO3. Previous studies have addressed the correlation between oxygen vacancies and electrical conductivity. The conductivity could be strongly varied when SrTiO3 is exposed to vacuum or O2 ambient. One the other hand, the extended defects (grain boundaries, dislocations, etc.) in SrTiO3 may also affect the distribution of oxygen vacancies. In this study, the impact of dislocations on oxygen vacancies in un-doped SrTiO3 single crystal has been investigated by cathodoluminescence (CL). CL results suggest that the accumulation of oxygen vacancies is easily triggered by certain dislocations. However, there is no significantly enhanced diffusion of oxygen vacancies along dislocations.