Issue 47, 2005

Surface-induced alignment of pentacene by photo-alignment technology for organic thin film transistors

Abstract

A series of highly soluble maleimide-based polymers with photoreactive pendant group were synthesized and used as a gate dielectric insulator for organic thin film transistors. Photoalignment properties were characterized by UV-visible spectroscopy and the alignment of liquid crystals. Photopolymerization of polymer-coated organic thin film transistors with linearly polarized UV light induces anisotropy in field-effect mobility. The gate dielectric insulator based on the photoalignable maleimide shows higher field-effect mobility and on/off current ratio than those from a SiO2 gate dielectric insulator with the values of 0.3 cm2 V−1 s−1 and 104, respectively. Our results demonstrate that the photo-induced anisotropy of alignment films to control the molecular order of semiconducting pentacene is a promising technology for improving the performance of organic thin film transistors.

Graphical abstract: Surface-induced alignment of pentacene by photo-alignment technology for organic thin film transistors

Article information

Article type
Paper
Submitted
27 Jul 2005
Accepted
05 Oct 2005
First published
17 Oct 2005

J. Mater. Chem., 2005,15, 5029-5036

Surface-induced alignment of pentacene by photo-alignment technology for organic thin film transistors

S. Jin, H. Seo, D. Nam, W. S. Shin, J. Choi, U. C. Yoon, J. Lee, J. Song, D. Shin and Y. Gal, J. Mater. Chem., 2005, 15, 5029 DOI: 10.1039/B510731H

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