Dr. Hahn is Fellow of Korea Academy of Science and Technology, Director of BK21 Center for Future Energy Materials and Devices, and Head of School of Semiconductor and Chemical Engineering, Chonbuk National University (CBNU). He joined CBNU in 1991, prior to which he worked for LG Metals Research Center for 1988-1991 after he received his Ph.D. in Metallurgical Engineering from University of Utah in 1988.

His research interest is the synthesis of metal, metal oxide and graphene-based composites and their applications for solar cells, printed electronics and chemical/biological sensors. He published over 300 peer-reviewed SCI papers with high H-index (currently 52 by Google Scholar) and registered 15 patents. He also co-authored 7 books including the world first multivolume handbook, Metal Oxide Nanostructures and Their Applications published in 2010 by American Scientific Publishers.

Dr. Hahn received Woo Seong-Il Materials Award in 2018, conferred by the KIChE, Asian Energy Technology Award in 2017, conferred by International Association of Advanced materials, Rudolph A. Marcus Award in 2016, conferred by Science Advances Today, the Scientist of Month Award in 2011 conferred by Korea Ministry of Education, Science and Technology, and the CBNU’s Best Research Professor Award in 2008-2010. He also honored as Top 100 Scientists four times in 2005 2011, 2014 and 2015 accredited by International Biographical Center, Cambridge, UK.

Dr. Hahn, now acting as a Global Ambassador for the ACerS since 2016, has also made huge contributions to the international ceramic community: he has served as a lead chair of Materials Challenges in Alternative and Renewable Energy (MCARE) for 2015 and 2017, and co-chair of MCARE for 2016 and 2018; co-organized over 18 symposia and conferences on ceramic and related materials, including symposia on Functional Nanomaterials and Thin Films for Sustainable Energy Harvesting, Environmental and Health Applications since 2010.