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1LJ-6 Exciton Imaging of Transition Metal Dichalcogenide Monolayers
김정용 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Transition-metal dichalcogenide (TMD) monolayers are atomically thin two-dimensional (2D) semiconductors with the direct bandgap, providing ideal platforms to study the interaction between light and confined excitons. Due to the 2D nature and strong Coulomb interaction resulting in large binding energies, these TMD monolayers host various exciton complexes of not only neutral excitons also charged excitons (trions) and biexcitons, routinely observable in room temperature. Using nanoscale optical imaging and spectroscopy, we will show that these exciton complexes coexist competing for the light emission, which largely depend on the surface conditions such as local defects or excess charge populations and the enhanced optical properties can be engineered by heterostructures of TMD monolayers.
Mobility of electrons and holes in an n-type organic semiconductorperylene diimide thin film
김정용,In Jae Chung,Changhee Lee,김영철,김재경,Jae-Woong Yu 한국물리학회 2005 Current Applied Physics Vol.5 No.6
N,N0-diphenylbutyl-3,4,9,10-perylenebiscarboximide (PTCDI-C4Ph) were characterized by optical and electrochemical methods.A device with an ITO/PTCDI-C4Ph (. 2l m)/Al structure was fabricated to measure mobility by time-of-ight techniques. This vac-uum deposited organic layer was an amorphous state. Electrons were observed faster than holes. The electron and hole mobilitieswere 1.8· 10. 4cm2/Vs and 1.1· 10. 4cm2/Vs under the electric eld of 500(V/cm)1/2, respectively. This result shows that thisorganic compound is a good candidate for an n-type conduction..