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Surface Modifications using Thiol Self-Assembled Monolayers on Au Electrodes in Organic Field Effect Transistors

Published online by Cambridge University Press:  26 February 2011

Nobuya Hiroshiba,
Ryotaro Kumashiro,
Naoya Komatsu,
Yusuke Suto,
Hisao Ishii,
Shinya Takaishi,
Masahiro Yamashita,
Kazuhiro Tsukagoshi and
Katsumi Tanigaki
Nobuya Hiroshiba
Affiliation:
hiro48n@sspns.phys.tohoku.ac.jp, Tohoku University, Department of Physics, 6-3 Aoba, Aramaki, Aoba, Sendai, 980-8578, Japan, +81-22-795-6469, +81-22-795-6470
Ryotaro Kumashiro
Affiliation:
rkuma@sspns.phys.tohoku.ac.jp, Tohoku University, Department of Physics, 6-3 Aoba, Aramaki, Aoba, Sendai, 980-8578, Japan
Naoya Komatsu
Affiliation:
komatsu@sspns.phys.tohoku.ac.jp, Tohoku University, Department of Physics, 6-3 Aoba, Aramaki, Aoba, Sendai, 980-8578, Japan
Yusuke Suto
Affiliation:
suto@sspns.phys.tohoku.ac.jp, Tohoku University, Department of Physics, 6-3 Aoba, Aramaki, Aoba, Sendai, 980-8578, Japan
Hisao Ishii
Affiliation:
ishii@sspns.phys.tohoku.ac.jp, Chiba Univeristy, Chiba, 980-8578, Japan
Shinya Takaishi
Affiliation:
takaishi@agnus.chem.tohoku.ac.jp, Tohoku University, Department of Chemistry, Sendai, 980-8578, Japan
Masahiro Yamashita
Affiliation:
yamasita@agnus.chem.tohoku.ac.jp, Tohoku University, Department of Chemistry, Sendai, 980-8578, Japan
Kazuhiro Tsukagoshi
Affiliation:
tsuka@riken.jp, Riken, Wako, 351-0198, Japan
Katsumi Tanigaki
Affiliation:
tanigaki@sspns.phys.tohoku.ac.jp, Tohoku University, Department of Physics, 6-3 Aoba, Aramaki, Aoba, Sendai, 980-8578, Japan
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Abstract

The influences of self-assembled-monolayers (SAMs) modifications on the gold electrodes in organic field effect transistors are studied using benzen-thiols (BzTs) having amino (NH2), nitro (NO2) and methyl (CH3) substituents and pentacene as an organic semiconductor. The field effect transistor (FET) characteristics are found to be very sensitive to the preparation condition of the SAMs modified surfaces. This can be rationalized in terms of the barriers against carrier injections made by SAMs and this situation can be monitored using a surface contact-angle method. The enhancement in the field effect mobilities μ is observed when the SAMs modifications to the electrodes are applied, and this could be caused by the higher efficiency of carrier injection attained by the hole transfer from SAMs to pentacene molecules.

Keywords

organicthin filmelastic properties

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References

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