Physics at Virginia


Andrew J. Lovinger , Bell Laboratories, Lucent Technologies
[Host: Bellave S. Shivaram]
The last few years have seen enormous growth in the area commonly referred to as "plastic electronics". The active elements of all such circuits are field-effect transistors. I will summarize our work on organic and polymeric transistors, which recently resulted in the first prototype of a flexible plastic display. The emphasis of the talk will be on the materials-science aspects, specifically on structure-morphology-processing-property correlations. We have synthesized and characterized a large number of organic and polymeric semiconductors, both p- and n-type, that are processable by vapor- or solution techniques (including printing). I will discuss the requirements that must be satisfied at the various levels of structure (chemical, molecular, unit-cell, crystalline, and bulk) for optimal charge transport. One centrally important requirement in this regard is the orientation of the semiconductor molecules on the substrate. For one organic compound we have also been able to visualize the conductive pathways themselves at a submolecular level of resolution. Lastly, a few applications of these materials will also be briefly discussed.
Condensed Matter Seminar
Thursday, March 20, 2003
3:30 PM
Physics Building, Room 204
Note special room.

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