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Control of Thin Film Transistor Operations with Polar Self-Assembled Monolayers

Published online by Cambridge University Press:  01 February 2011

Y. Iwasa ,
T. Nishikawa ,
S. Kobayashi ,
T. Takenobu ,
T. Shimoda ,
T. Mitani  and
K. Kubozono
Y. Iwasa
Affiliation:
Institute for Material Reasearch, Tohoku University, Sendai 980-8577, Japan CREST, Kawaguchi 333-0012, Japan.
T. Nishikawa
Affiliation:
Institute for Material Reasearch, Tohoku University, Sendai 980-8577, Japan Japan Advanced Institute of Science and Technology, Ishikawa 923-1292, Japan.
S. Kobayashi
Affiliation:
Institute for Material Reasearch, Tohoku University, Sendai 980-8577, Japan CREST, Kawaguchi 333-0012, Japan.
T. Takenobu
Affiliation:
Institute for Material Reasearch, Tohoku University, Sendai 980-8577, Japan CREST, Kawaguchi 333-0012, Japan.
T. Shimoda
Affiliation:
Japan Advanced Institute of Science and Technology, Ishikawa 923-1292, Japan.
T. Mitani
Affiliation:
Japan Advanced Institute of Science and Technology, Ishikawa 923-1292, Japan.
K. Kubozono
Affiliation:
CREST, Kawaguchi 333-0012, Japan. Department of Chemistry, Okayama University, Okayama 700-8530, Japan.
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Abstract

From the view point of materials sciences, one of the central issues in organic thin film transistors (TFTs) is the interface between different materials inherent in the device structure. For example, the interface between organic semiconductors and electrodes controls the carrier injection, while the interface between organic semiconductors and gate insulators governs the trap and carrier densities. Here, we show that interface modification with self-assembeld monolayers (SAMs) using polar organosilane molecules offers novel functions in organic TFTs. SAMs on SiO2 gate dielectrics was found to the carrier density at the conduction channel, while the adsorbed SAMs molecules on metal electrodes causes an ambipolar operation in fullerene TFTs. These interface modification techniques, since they are low temperature processes, provide novel opportunities for improving device manufacturing processes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 871: Symposium I – Organic Thin-Film Electronics , 2005 , I3.3
Copyright
Copyright © Materials Research Society 2005

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