Title:    Exciton and Charge-Carrier Dynamics in Organic and Inorganic Semiconductors Through Pump-Probe Spectroscopy

Time:    2026-03-16 14:00

Lecturer:  JaeHong Park

Ewha Womans University, Seoul, Republic of Korea

Venue:    Room 2, Energy Materials Building 3, Xiang'an Campus

Abstract：

For semiconductors in molecular optronics, photoinduced dynamics of excitons and free-carriers (electrons and holes) such as exciton-dissociation and carrier-recombination dynamics is the key process of the device operation. To probe this dynamics, various spectroscopic and electrical techniques have been utilized. In this presentation, first, I will introduce flash-photolysis time-resolved microwave conductivity (fp-TRMC) experiments, which are visible-pump/microwave-probe spectroscopic measurements and specialized in examining the dynamics of free-carriers. Exemplary free-carrier dynamics in various organic and inorganic systems studied by fp-TRMC will be discussed. Secondly, my presentation will discuss the photoinduced electron and proton transfer dynamics in organic semiconductors.

Bio of the Lecturer：

JaeHong Park, originally from Seoul, Republic of Korea is an associate professor at the Department of Chemistry and Nanoscience and a director of Institute for Multiscale Matter and Systems (IMMS) Analysis Facility in Ewha Womans University (EWU) in Korea. After he earned a B.S. in Chemistry, mentored by Professor Dongho Kim from Yonsei University, Seoul Korea, he then obtained a Ph.D. in Chemistry (Physical Chemistry) from the University of Pennsylvania, Philadelphia, USA under the guidance of Professor Michael J. Therien. After postdoctoral research at the Chemistry and Nanoscience Center in National Renewable Energy Laboratory (NREL), Colorado, USA with Dr. Garry Rumbles, he joined the Department of Molecular Engineering, Kyoto University in Japan as a Junior Associate Professor and later moved to EWU in 2020. JaeHong Park has received several honors throughout his research career, including the Graduate Research Excellence Award from the University of Pennsylvania, the Key Contribution Award from the National Renewable Energy Laboratory (NREL), and recognition as one of the Emerging Investigators 2018 by Molecular Systems Design and Engineering (Royal Society of Chemistry), among others. Park's research interest spans from fundamental studies of photophysics and excited-state dynamics of organic/inorganic semiconducting materials, using experimental physical and material chemistry methods.