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Molecular-Wetting Control by Ultrasmooth Pentacene Buffer for High-crystallinity Organic Field-Effect Transistors

Published online by Cambridge University Press:  26 February 2011

Kenji Itaka ,
Mitsugu Yamashiro ,
Jun Yamaguchi ,
Masamitsu Haemori ,
Seiichiro Yaginuma ,
Yuji Matsumoto  and
Hideomi Koinuma
Kenji Itaka
Affiliation:
[email protected], The University of Tokyo, Graduate school of Frontier Sciences, 5-1-5 Kashiwanoha, Kashiwa, Kashiwa, 277-8568, Japan, +81 4 7136 4485, +81 4 7136 4485
Mitsugu Yamashiro
Affiliation:
[email protected], Tokyo Institute of Technology, Materials and Structures Laboratory, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
Jun Yamaguchi
Affiliation:
[email protected], The University of Tokyo, Graduate school of Frontier Sciences, 5-1-5 Kashiwanoha, Kashiwa, 277-8568, Japan
Masamitsu Haemori
Affiliation:
[email protected], The University of Tokyo, Graduate school of Frontier Sciences, 5-1-5 Kashiwanoha, Kashiwa, 277-8568, Japan
Seiichiro Yaginuma
Affiliation:
[email protected], The University of Tokyo, Graduate school of Frontier Sciences, 5-1-5 Kashiwanoha, Kashiwa, 277-8568, Japan
Yuji Matsumoto
Affiliation:
[email protected], Tokyo Institute of Technology, Materials and Structures Laboratory, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
Hideomi Koinuma
Affiliation:
[email protected], The University of Tokyo, Graduate school of Frontier Sciences, 5-1-5 Kashiwanoha, Kashiwa, 277-8568, Japan
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Abstract

Organic thin film devices are of interest for a variety of forthcoming ubiquitous electronics applications. In order to build ubiquitous high-performance devices, it is necessary to fabricate crystalline thin films of various organic materials onto “ubiquitous substrates” that are dictated by applications. However, many organic thin films crystallize only on a limited selection of substrates. Unfortunately, promising organic molecules, which have a large overlap of pi-orbitals between molecules, cannot migrate freely on a substrate because of stronger cohesion between molecules than interaction between the molecule and the substrate. Therefore, enhancement of the molecule-substrate interaction, i.e. ‘molecular wettability’ should promote crystallization. We found that an ultrasmooth monolayer of pentacene (C22H14), which can be grown on many general dielectric substrates, changes the molecular wettability of a substrate for other poorly wettable organic materials. We also demonstrate that a field effect transistor (FET) using a crystalline C60 thin film on a pentacene-buffered substrate can have a mobility of 4.9 cm2/Vs, which is 5-fold higher than that of C60 FETs without the buffer. Molecular wetting-controlled substrates can thus offer a general solution to the fabrication of high-performance crystalline plastic and molecular electronics.

Keywords

organicthin filmdevices
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 965: Symposium S – Organic Electronics – Materials, Devices and Applications , 2006 , 0965-S05-05
Copyright
Copyright © Materials Research Society 2007

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References

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