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The attractive and unique properties of two-dimensional materials have led to rigorous multi-disciplinary researches on their fundamental properties, growth and application. Two-dimensional (2D) materials have brought a great deal of excitement to our community with their attractive and unique properties. Such excellent characteristics have led rigorous multidisciplinary researches on fundamental properties, growth, and applications of 2D materials. In this talk, Professor Lee will introduce current progress in 2D material researches and show his group’s recent achievements. They have developed growth techniques for large-scale and large-grain 2D materials and characterized the defects, such as sp3, nano-holes, and grain boundaries. They have also fabricated a van der Waals (vdW) device platform to investigate the intrinsic properties of 2D materials. This enables them to investigate intrinsic properties of atomically-sharp heterostructure interfaces and fabricate high performance electronic devices for advanced electronics. In addition, they can modify the whole properties of 2D materials by surface-treatment, leading to high mobility enhancement, bandgap opening, and hydrophobic-to-hydrophilic transition of graphene. By using their own techniques, the group demonstrated 2D-material-based electronics, such as flexible/transparent electronic devices, memory, solar cells. The experimental results and fabrication processes show a new way for studying of the intrinsic properties of 2D materials and controlling them for advanced electronics.
Professor Gwan-Hyoung Lee completed his PhD in Materials Science and Engineering at Seoul National University in 2006. Lee has worked in the materials science field and in both industry and academia. After graduation, he worked as a senior engineer in Samsung electronics for three and a half years. Then he transferred to Columbia University, USA, as a postdoctoral research scientist in 2010 and worked in 2D materials for four years. He has made a very significant contribution to understanding of 2D materials, including graphene, graphene oxide, 2D semiconductors of MoS2 and WSe2. He has published 36 papers, including publications in high impact journals, such as 1 Science, 2 Nature Materials, 3 Nature Nanotechnology, 2 Nature Communications, 2 Nano Letters, and 2 ACS Nano. He also holds 9 patents related to the growth of graphene and the optical identification of defects.