Youngmin Kim



PREVIOUS INSTITUTION: BS, Korea University, Seoul, Korea
DATE JOINED GROUP: September 1999
AREAS OF STUDY: Spintronics; spectroscopy
EMAIL: hiyoung@pacific.mps.ohio-state.edu
WEB: http://www.physics.ohio-state.edu/~hiyoung


CURRENT RESEARCH
Spectroscopic study of conjugated polymer materials/devices is my major research field in our lab.Wide variety of probes are used to determine the nature of the metallic state and of insulator to metal transition(IMT) in conducting polymers. DC transport studies give insight in the insulating or metallic nature of electrons at the Fermi level, and the measurement of high frequency transport or the optical properties provide an important probe away form the Fermi energy to help determine between the homogeneously and inhomogeneously disordered metallic state. For example, optical constants like conductivity and dielectric functions can be determined by Kramer-Kornig analysis of reflectance or transmission data, and they can give the presence of Drude dispersion in electrical response, the plasma frequency of the free electons, mean free paths for the samples near IMT, etc. Wide spectral range(0.002-6.5eV) is covered by Perkin-Elmer Lambda-19 UV/Vis/NIR spectrometer and Bruker 66v/S FTIR spectrometer. Recently, reflectance and its electric field modulation are studied on PEDOT/PSS and its field effect device.


PRESENTATIONS AT CONFERENCES




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