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Lecture George Malliaras


25 May 2007 FWN-Building 5118.-156, Nijenborgh 4, 9747 AG, Groningen
Speaker:Prof. Dr. George Malliaras
Affiliation:Department of Materials Science and Engineering, Cornell University, Ithaca, USA
Title:Ions: The neglected carriers in organic electronics
Date:Fri May 25, 2007
Location:FWN-Building 5118.-156
Host:P. Rudolf
Telephone:+31 50 363 4736


Dramatic advances have been achieved in the performance of organic electronic devices during the last fifteen years. Several traditional devices, such as light emitting diodes, transistors, and solar cells, can now be made using pi-conjugated organic materials as the semiconductor. This is of interest because of the potential for low-cost fabrication, and for the exciting science organic materials bring to the table. However, as in traditional (silicon) electronics, the operation of these devices relies predominantly on electronic carriers, while ions are neglected. I will draw on two examples to illustrate the advantages that can be gained (and the penalties that must be paid) when, in addition to electronic carriers, ions are also employed. The first one is electroluminescent devices based on ionic transition metal complexes. These materials, studied for years by electrochemists and spectroscopists in solution, can now yield efficient solid-state electroluminescent devices that are considered for display and lighting applications. Materials issues that need to be addressed for these devices to succeed in applications will be discussed, and emphasis will be given on understanding the degradation mechanisms of these materials. The second example is electrochemical transistors based on conducting polymers. These devices act as converters between ionic and electronic current, providing a powerful interface between the worlds of biology and electronics. Their potential applications in sensors will be discussed. Bio: George Malliaras is an Associate Professor in the Department of Materials Science and Engineering at Cornell University and the Lester B. Knight Director of the Cornell Nanoscale Facility. He did his doctoral research in the University of Groningen (the Netherlands), on photorefractivity in polymers. Before joining the faculty at Cornell in '98, he spent two years at the IBM Almaden Research Center. His research focuses on organic semiconductors and their devices, with recent emphasis on their applications in sensors. He is a member of the American Physical Society and the Materials Research Society. He is the recipient of the NSF Young Investigator Award, the DuPont Young Professor Grant, and a Cornell College of Engineering Teaching Award. He is the chairman of the editorial board of the Journal of Materials Chemistry and serves on the editorial board of Sensors.
Last modified:22 October 2012 2.30 p.m.