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Conducting Polypyrrole-based Field Effect Transistors Fabricated by Spin Coating and Inkjet Printing

Published online by Cambridge University Press:  17 March 2011

Fengliang Xue ,
Yi Su  and
Kody Varahramyan
Fengliang Xue
Affiliation:
Institute for Micromanufacturing, Louisiana Tech University, Ruston, LA 71272, U.S.A
Yi Su
Affiliation:
Institute for Micromanufacturing, Louisiana Tech University, Ruston, LA 71272, U.S.A
Kody Varahramyan
Affiliation:
Institute for Micromanufacturing, Louisiana Tech University, Ruston, LA 71272, U.S.A
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Abstract

Spin coating and inkjet printing are two major deposition techniques for flexible polymer plastic electronics. This paper presents polymer field effect transistors (FET) fabricated by these two techniques using conducting poylmer polypyrole (PPy) as a semiconductor material. These thin film polymer field effect transistors operate in the depletion mode. The field effect mobilities are calculated to be 0.045 cm2 V−1s−1 and 0.036 cm2 V−1s−1, and transconductances are 0.104 νS and 0.096 νS at saturation region of the I-V curves for the spin coated and the inkjet printed transistors, respectively. The measured turn-off threshold voltage is around 20 V for both the spin coated and inkjet printed PPy FET transistors. The device performance of the spin coated transistors is slightly better than that of the inkjet printed transistors. This is mainly due to high surface roughness of the printed polymer film and printed dot boundaries, leading to low charge carrier mobility in the printed polymer FET transistors.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 814: Symposium I – Flexible Electronics 2004-Materials and Device Technology , 2004 , I10.20
Copyright
Copyright © Materials Research Society 2004

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