Issue 26, 2010
From the journal:

Journal of Materials Chemistry

Tuning surface properties in photosensitive polyimide. Material design for high performance organic thin-film transistors†

Wei-Yang Chou,*a   Chia-Wei Kuo,a   Chia-Wen Chang,b   Bo-Liang Yeha  and  Ming-Hua Changa  

* Corresponding authors

a Institute of Electro-Optical Science and Engineering, Center for Micro/Nano Science and Technology, Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan, Taiwan
E-mail: weiyang@mail.ncku.edu.tw
Fax: +886 6 2095040
Tel: +886 6 2757575 ext.65282

b Eternal Research Institute, Eternal Chemical Co. Ltd., Kaohsiung, Taiwan

Abstract

A photosensitive polyimide (PSPI) is synthesized to serve as the gate dielectric in organic thin-film transistors (OTFTs). A method to control the charge density within the channel of the OTFT using the PSPI on a silicon dioxide gate dielectric is proposed. The surface energy, surface carriers, and capacitance of gate dielectrics can be tuned by varying irradiation doses of UV light on the PSPI surface to create ultrahigh performance pentacene-based OTFTs with an average field-effect mobility (μ) of above 6.0 cm2/Vs. The correlation between the surface energy of the PSPI films and the μ value of OTFT devices is investigated. Moreover, the impact of gate-dielectric properties on the structural properties of pentacene films is closely related to the electrical characteristics of OTFTs. The results of contact angle, X-ray diffraction, electrostatic force microscopy, and micro-Raman spectroscopy measurements indicate that the surface energy and doping carriers coming from the PSPI film play important roles in the carrier transport of pentacene film for OTFT applications.

Graphical abstract: Tuning surface properties in photosensitive polyimide. Material design for high performance organic thin-film transistors

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Article information

DOI
https://doi.org/10.1039/C0JM00196A
Article type
Paper
Submitted
29 Jan 2010
Accepted
19 Mar 2010
First published
11 May 2010

J. Mater. Chem., 2010,20, 5474-5480

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Tuning surface properties in photosensitive polyimide. Material design for high performance organic thin-film transistors

W. Chou, C. Kuo, C. Chang, B. Yeh and M. Chang, J. Mater. Chem., 2010, 20, 5474 DOI: 10.1039/C0JM00196A

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