Science Seminar - Dr. Heungman Park

April 18, 2019,

11:00 am, C101, Glaske Center for Engineering, Science, and Technology

LeTourneau University

Longview, TX


Exciton dynamics in organic semiconductors



Dr. Heungman Park received his B.S. degree in Physics from Hanyang University (Korea) in 2002, M.S. degree in Physics from Oregon State University in 2005, and Ph.D. degree in Physics from Vanderbilt University in 2010. He was a post-doctoral researcher at the University of Texas at Austin and Columbia University. He joined the Department of Physics and Astronomy at TAMU-Commerce as an assistant professor in Fall 2016. Currently he is building a research program on the campus for MS and BS students. The program includes: 1) studying charge carrier dynamics at the interface of organic/inorganic hybrid systems, 2) incorporating metal nanoparticles into organic materials for electrode fabrication, 3) studying exciton migration/diffusion during photo-degradation in conjugated organic semiconductors, 4) utilizing and characterizing biopolymers such as Salmon DNA and cellulose nanocrystals for opto-electronic applications.



For the past several decades, inorganic semiconductors such as silicon have been the key materials in electronic devices. However, these days organic materials are vigorously studied for their potential applications in next generation opto-electronic devices such as organic light emitting diode (OLED) and solar cells. They have many advantages over inorganic materials. Most organic semiconductors are less expensive, flexible and versatile. However their material properties are still not well understood compared to inorganic materials. In this colloquium, the basic material properties of both organic and inorganic semiconductors, and the working principles of OLED and solar cell devices will be reviewed. Recent results of exciton dynamics of MEH-PPV conjugated polymer semiconductor will be presented at the single molecule level and in thin films. The research projects of the organic semiconductor physics lab at TAMU-Commerce will be also introduced.