- Qiyang Lu, Massachusetts Institute of Technology, Cambridge
Oxygen point defects are essential building blocks for macroscopic properties and functionalities of functional oxides with perovskite structure. Therefore, properties of perovskite oxides can be controlled by engineering the oxygen defects to improve their performance in various applications, including oxide electronics, multiferroic devices, and energy-storage and conversion devices. In this talk, the speaker will present two case studies on the important methods of tuning oxygen defect chemistry, that is, local chemical doping and application of electrochemical potentials. Combining oxide growth technique and in situ/in operando characterization tools enabled by synchrotron facilities could reveal the large changes on crystal and electronic structures induced by oxygen defects. Insights from this work can guide better design of perovskite oxides for enhancing the performance in memristive devices and (electro-)catalysis.