Abstract

Recent societal demands for carbon neutrality and zero-energy technologies have spurred active research in passive radiative cooling. This method, which strongly reflects the solar spectrum of 300 nm to 3 um and effectively emits the thermal radiation spectrum of 4 to 20 um, is being developed in various forms including metal/dielectric multilayer thin films, micro-particle arrays, and porous structures, demonstrating significant cooling properties of over 4 degrees without external power. Particularly, this process maximizes heat transfer efficiency by emitting infrared rays into space through selective emission (SE) in the highly atmospheric transmittance band of 8 to 13 um. Major applications include building exteriors, automobiles, and wearable devices, and it is applicable in almost all environments where solar exposure is possible. However, several unresolved issues remain in the currently developed passive radiative cooling, including 1) improvement of cooling performance, 2) scalability, and 3) expansion of application fields. This presentation will discuss the theoretical background and major research trends in passive radiative cooling, and propose solutions to address the issues arising in major applications.

Biography

Dr. Young Min Song is a distinguished professor of GIST at the School of Electrical Engineering and Computer Science and AI Graduate School at the Gwangju Institute of Science and Technology (GIST), Korea. Before joining the GIST, he was an assistant professor at the Pusan National University from 2013 to 2016. He received a M.S. and Ph.D. in Information and Communications from the Gwangju Institute of Science and Technology (GIST) in 2006 and 2011, respectively, after a B.S. degree in Biomedical Engineering from Yonsei University in 2004. From 2011 to 2013, he was a postdoctoral research associate in the Department of Materials Science and Engineering at the University of Illinois at Urbana–Champaign. Dr. Young Min Song’s research interests include advanced optoelectronic devices/systems, multifunctional nanophotonics, and optical healthcare systems. He is a senior member of Optica, a member of SPIE, and MRS. He is serving as a senior editor of the IEEE Photonics Journal and an editorial board member of the Journal of Optical Microsystems (JOMs) and Soft Science. He is a member of the Young Korea Academy of Science and Technology(Y-KAST), Korea.