Dr. Ji Ung Lee is the Empire Innovation Professor of Nanoscale Engineering at the College of Nanoscale Science and Engineering of the University at Albany-SUNY. He holds a Ph.D. in Electrical Engineering from the University of Wisconsin-Madison. Prior to his transition to UAlbany in 2007, he was a senior scientist and a project leader at General Electric Global Research Center, one of the world’s most diversified industrial laboratory. He currently manages the operational aspects of the NRI/INDEX post-CMOS program. His current interest is in the transport and optical properties of carbon nanotubes and graphenes. His recent work includes the development of an ideal carbon nanotube p-n diode, one of the most fundamental electronic devices, for which he was awarded the 2004 GE Global Research Hull award (the highest award for young scientists) and the 2005 NASA Tech Briefs Nano 50 Award. He holds 21 patents and has 19 publications.
Excitronics: Excitonic Circuits for post-CMOS Electronics
(Ji Ung Lee, College of Nanoscale Science and Engineering, University at Albany)
In this talk, I will describe the properties of excitons in single-walled carbon nanotubes (SWNTs) that make them attractive as a post-CMOS state variable. The essential properties needed for any new state variable are: creation, transport and detection. These properties will be described for excitons created within nanotube p-n diodes, one of the most fundamental of all electronic devices. The p-n diodes are formed along individual nanotubes and can show ideal diode behavior, the theoretical limit of performance for any diode. I will describe the dc, the optical and the interplay between transport and optical properties. For example, these diodes are able to probe the excited states of SWNTs, including the lowest exciton transition and the continuum. Based on these results, we extract properties that are meaningful for electronic applications, including exciton binding energy, transport, and optical cross section.