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Proceedings Paper

Enhancing the performance of organic thin film transistors using a novel photoalignment method
Author(s): Wei-Yang Chou; Chia-Wei Kuo; Yu-Shen Mai; Shih-Ting Lin; Hong-Long Cheng; Chi-Chang Liao; Dun-Ying Shu
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Paper Abstract

This study first demonstrated the feasibility of using the photoalignment method to adequately control the structural anisotropy of pentacene films, which are active semiconducting layers, in thin-film transistors (TFTs) with conspicuous anisotropic electrical characteristics. The photoaligned pentacene films were characterized with respect to structure and morphology using x-ray diffraction, atomic force microscopy and Raman scattering. Compared to the uncontrolled pentacene films, a maximum 25-times increase in field-effect mobility (up to 0.82 cm2/Vs) is achieved in the photoaligned pentacene-based TFTs by aligning pentacene orientation parallel to the current flow direction using a photoaligned polyimide layer. Mobility anisotropic ratios ranging between 2.7-8.3 for the current flow parallel and perpendicular to the alignment of the photoaligned pentacene films have been observed for photoaligned pentacene-based TFTs.

Paper Details

Date Published: 18 October 2004
PDF: 12 pages
Proc. SPIE 5522, Organic Field-Effect Transistors III, (18 October 2004); doi: 10.1117/12.559133
Show Author Affiliations
Wei-Yang Chou, National Cheng Kung Univ. (Taiwan)
Chia-Wei Kuo, National Cheng Kung Univ. (Taiwan)
Yu-Shen Mai, National Cheng Kung Univ. (Taiwan)
Shih-Ting Lin, National Cheng Kung Univ. (Taiwan)
Hong-Long Cheng, National Cheng Kung Univ. (Taiwan)
Chi-Chang Liao, Industrial Technology Research Institute (Taiwan)
Dun-Ying Shu, Industrial Technology Research Institute (Taiwan)

Published in SPIE Proceedings Vol. 5522:
Organic Field-Effect Transistors III
Ananth Dodabalapur, Editor(s)

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