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Fabrication of Organic Thin Film Transistor Based on the Ink-Jet Printed Electrodes of Nano Silver Particles

Published online by Cambridge University Press:  01 February 2011

Dongjo Kim ,
Sunho Jeong ,
Sul Lee ,
Bong-Kyun Park  and
Jooho Moon
Dongjo Kim
Affiliation:
jmoon@yonsei.ac.kr, Yonsei University, Department of Materials Science and Engineering, Shinchon-dong 134, Seodaemoon-gu, Seoul, N/A, N/A, Korea, Republic of
Sunho Jeong
Affiliation:
gorg1@yonsei.ac.kr, Yonsei University, Department of Materials Science and Engineering, 134 Shinchon-dong, Seodaemun-ku, Seoul, N/A, 120-749, Korea, Republic of
Sul Lee
Affiliation:
dew01@yonsei.ac.kr, Yonsei University, Department of Materials Science and Engineering, 134 Shinchon-dong, Seodaemun-ku, Seoul, N/A, 120-749, Korea, Republic of
Bong-Kyun Park
Affiliation:
bong82@yonsei.ac.kr, Yonsei University, Department of Materials Science and Engineering, 134 Shinchon-dong, Seodaemun-ku, Seoul, N/A, 120-749, Korea, Republic of
Jooho Moon
Affiliation:
jmoon@yonsei.ac.kr, Yonsei University, Department of Materials Science and Engineering, 134 Shinchon-dong, Seodaemun-ku, Seoul, N/A, 120-749, Korea, Republic of
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Abstract

In this work, we here developed a conductive ink which contains silver nano-particles from which the electrodes for organic thin film transistor were directly patterned by ink-jet printing. Nano-sized silver particles having ∼ 20nm diameter was used for the direct metal printing. Silver conductive ink was printed on the heavily doped n-type silicon wafer with 200-nm thick thermal SiO2 layer as a substrate. To achieve a high line resolution and smooth conductive path, the printing conditions such as the inter-drop distance, stage moving velocity and temperature of the pre-heated substrates were optimized. After the heat-treatment at temperatures of about 100 ∼ 300 ° for 30 min, the printed silver patterns exhibit metal-like appearance and the conductivity. To fabricate a coplanar type TFTs, an active material of semiconducting polymer, which was dissolved in a proper solvent, was deposited between the ink-jet printed silver electrodes by solution process. The output and transfer characterization was measured in air. The OTFT with the ink-jetted source/drain electrodes show a mobility of 1.3 × 10−3 cm2 V−1 s−1 in the saturation regime and on/off current ratio over 103 and a threshold voltage of about −13 V.

Keywords

ink-jet printingAgdevices
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 937: Symposium M – Conjugated Organic Materials – Synthesis, Structure, Device, and Applications , 2006 , 0937-M10-42
Copyright
Copyright © Materials Research Society 2006

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