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Condensed Matter Seminars
| Condensed Matter
Thursday, March 20, 2003
Physics Building, Room 204
Note special time.
Note special room.
Andrew J. Lovinger
[Host: Bellave S. Shivaram]
Bell Laboratories, Lucent Technologies
"ELECTROACTIVE POLYMERIC AND ORGANIC MATERIALS FOR THIN-FILM-TRANSISTOR APPLICATIONS"
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.
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