Dr. Yong-Duck Chung is a leading researcher in advanced materials science, with significant contributions to topological insulators, thin-film photovoltaics, and optoelectronic device engineering. His work focuses on the design, fabrication, and characterization of chalcogenide thin films, nano-structured materials, and surface/interface electronic structures using advanced techniques such as synchrotron radiation. He has played a pivotal role in developing high-efficiency CIGS solar cells, high-speed optical communication devices, and next-generation photonic systems. With a strong emphasis on functional thin films and quantum materials, his research bridges fundamental physics and practical device applications. He has authored 144 scientific publications with 1862 citations and an h-index of 25, reflecting sustained impact and scholarly influence. His contributions are further evidenced by numerous international patents in photovoltaic and optical technologies, advancing innovation in energy conversion and semiconductor device engineering.