Enhancing the performance of organic thin film transistors using a novel photoalignment method

Wei-Yang Chou; Chia-Wei Kuo; Yu-Shen Mai; Shih-Ting Lin; Hong-Long Cheng; Chi-Chang Liao; Dun-Ying Shu

doi:10.1117/12.559133

18 October 2004 Enhancing the performance of organic thin film transistors using a novel photoalignment method

Wei-Yang Chou, Chia-Wei Kuo, Yu-Shen Mai, Shih-Ting Lin, Hong-Long Cheng, Chi-Chang Liao, Dun-Ying Shu

Proceedings Volume 5522, Organic Field-Effect Transistors III; (2004) https://doi.org/10.1117/12.559133
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

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.

Citation Download Citation

Wei-Yang Chou, Chia-Wei Kuo, Yu-Shen Mai, Shih-Ting Lin, Hong-Long Cheng, Chi-Chang Liao, and Dun-Ying Shu "Enhancing the performance of organic thin film transistors using a novel photoalignment method", Proc. SPIE 5522, Organic Field-Effect Transistors III, (18 October 2004); https://doi.org/10.1117/12.559133

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