Dr. Cai received his Ph.D. in Material Science and Electron Microscopy from Nanjing University in 2019. From 2019 to 2020, he was serving as a postdoctoral fellow in the Hong Kong Polytechnic University. After that, he joined the Department of Applied Physics at the Hong Kong Polytechnic University in Oct. 2020 as a Research Assistant Professor, and he was promoted to Assistant Professor in Oct. 2022. His research interests include the development and application of in situ electron microscopy techniques, and the advanced scanning transmission electron microscopy characterizations of functional perovskite materials and devices. His research works have been published in renowned journals including Nature, Nature Electronics, Nature Communications, J. Am. Chem. Soc., ACS Energy Lett., Adv. Funct. Mater. etc.