Prof. Soon-Gil Yoon received his Ph.D. from the Korea Advanced Institute of Science and Technology (KAIST), Korea in 1988. He is a professor in Department of Materials Science and Engineering, Chungnam National University, Republic of Korea. His current research interests are Thin film capacitor, Fusion technology of Solar cell, Thermoelectric, and Piezoelectric using one material and one structure, In-situ graphene growth with no transfer at 150 oC, Flexoelectric properties using Zn-Al:LDH nanosheets. Perovskite dye thin films such as MAPbI3, MASnI3, and MAPbCl3, etc by CVD. He had published about 330 SCI papers including Nano Letters, Advanced Materials, ACS Nano, Nano Energy, J. Mater. Chem. A, and Scientific Reports.