High-performance polythiophene thin-film transistors with nematic liquid crystal modification |
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Authors: | Min-Kun Dai Jan-Tien Lian Tai-Yuan Lin Ming-Chung Chen Yian Tai Yang-Fang Chen |
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Affiliation: | 1. Department of Physics, National Taiwan University, Taipei 106, Taiwan;2. Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung 202, Taiwan;3. Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan |
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Abstract: | The influence of nematic liquid crystal molecules on the electrical properties and microstructure of polymer semiconductors poly(3-hexylthiophene) (P3HT) was investigated. It was found that the introduction of nematic liquid crystal molecules can significantly improve the performance of P3HT thin-film transistors, providing better electrical characteristics and enhanced mobility. The field-effect mobility of the device with liquid crystal modification can be enhanced by up to a factor of ten with respect to that of the pure P3HT device. UV–visible absorption spectroscopy, X-ray diffraction, and atomic force microscopy measurements show that the enhancement of charge-carrier mobility is achieved through a more highly organized morphology and a reduction in the density of traps presents in the P3HT/liquid crystal structure. The results shown here therefore illustrate a high-performance solution-processable thin-film transistors, which is quite feasible and can pave a key step for the practical applications of organic electronic devices. |
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Keywords: | Nematic liquid crystal Conjugated polymer Crystallinity Organic thin film transistor |
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