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Appl. Sci. 2018, 8(8), 1274; https://doi.org/10.3390/app8081274

Influence of Substrate Modification with Dipole Monolayers on the Electrical Characteristics of Short-Channel Polymer Field-Effect Transistors

1
Department of Physics and Electronics, Osaka Prefecture University, Sakai 599-8531, Japan
2
The Research Institute for Molecular Electronic Devices, Osaka Prefecture University, Sakai 599-8531, Japan
3
Advanced ICT Research Institute, National Institute of Information and Communications Technology, Kobe 651-2492, Japan
*
Authors to whom correspondence should be addressed.
Received: 29 June 2018 / Revised: 17 July 2018 / Accepted: 26 July 2018 / Published: 1 August 2018
(This article belongs to the Special Issue Semiconducting Polymer for Organic Transistors)
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Abstract

This study investigates the influence of self-assembled monolayer treatment of gate insulators on the electrical characteristics of bottom-gate/bottom-contact organic field-effect transistors (OFETs) with short channel lengths of 5 μm to 30 nm. The treatment of 3-chloropropyltrichlorosilane (CPTS) with large dipoles produces a high built-in electric field perpendicular to the SiO2 gate insulator surface, which results in a threshold voltage shift and enhanced hole injection compared to the treatment of phenethyltrichlorosilane (PETS) with small dipoles. Pronounced parabolic drain current‒voltage (IDVD) characteristics due to a space-charge limited current are observed in short-channel OFETs based on poly(3-hexylthiophene) with CPTS-treated gate insulators. CPTS treatment on short-channel OFETs based on poly(9,9-dioctylfluorene-co-bithiophene) (F8T2) suppresses the nonlinear ID increase in the low VD region caused by the voltage drop at the Au/F8T2 contact. The influence of the increase in the net source-drain electric field associated with the reduced voltage drops on the channel-length dependence of the field-effect mobility of short-channel F8T2 FETs is also discussed. View Full-Text
Keywords: organic field-effect transistor; short-channel effect; self-assembled monolayer; dipole electric field organic field-effect transistor; short-channel effect; self-assembled monolayer; dipole electric field
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Nagase, T.; Hirose, T.; Kobayashi, T.; Ueda, R.; Otomo, A.; Naito, H. Influence of Substrate Modification with Dipole Monolayers on the Electrical Characteristics of Short-Channel Polymer Field-Effect Transistors. Appl. Sci. 2018, 8, 1274.

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