Patterning Liquid Crystalline Organic Semiconductors via Inkjet Printing for High-Performance Transistor Arrays and Circuits |
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Authors: | Xiaochen Fang Jialin Shi Xiujuan Zhang Xiaobin Ren Bei Lu Wei Deng Jiansheng Jie Xiaohong Zhang |
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Affiliation: | 1. Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu, 215123 P. R. China;2. Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu, 215123 P. R. China
Macao Institute of Materials Science and Engineering, Macau University of Science and Technology, Taipa, Macau SAR, 999078 P. R. China |
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Abstract: | Liquid crystalline (LC) organic semiconductors having long-range-ordered LC phases hold great application potential in organic field-effect transistors (OFETs). However, to meet real device application requirements, it is a prerequisite to precisely pattern the LC film at desired positions. Here, a facile method that combines the technique of inkjet printing and melt processing to fabricate patterned LC film for achieving high-performance organic integrated circuits is demonstrated. Inkjet printing controls the deposition locations of the LC materials, while the melt processing implements phase transition of the LC materials to form high-quality LC films with large grain sizes. This approach enables to achieve patterned growth of high-quality 2,7-dioctyl1]-benzothieno3,2-b]1]benzothiophene (C8-BTBT) LC films. The patterned C8-BTBT LC film-based 7 × 7 OFET array has 100% die yield and shows high average mobility of 6.31 cm2 V?1 s?1, along with maximum mobility up to 9.33 cm2 V?1 s?1. As a result, the inverters based on the patterned LC films reach a high gain up to 23.75 as well as an ultrahigh noise margin over 81.3%. Given the good generality of the patterning process and the high quality of the resulting films, the proposed method paves the way for high-performance organic integrated devices. |
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Keywords: | inkjet printing inverters liquid crystalline organic semiconductors organic field-effect transistors patterned growth |
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