| 研究実績の概要 |
The oxygen vacancies (Vo) directly govern the bulk and interfacial properties of perovskites, including dielectric relaxation and electrical conduction, n-type doping, and the introduction of two-dimensional electron gas.
Many studies suggested that dislocations can modulate the distribution of Vo. To directly know the local distribution of Vo around dislocations, we conducted cathodoluminescence (CL) study on SrTiO3 crystals.
Enhanced Vo-related luminescence has been observed at specific dislocations with the accumulation of oxygen vacancies. On the other hand, enhanced luminescence was also observed in the matrix without dislocations. The distribution of Vo would be affected not only by dislocations, but also other factors such as strain field and impurities.
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