Optimization of electrohydrodynamic-printed organic electrodes for bottom-contact organic thin film transistors |
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| Affiliation: | 1. Department of Advanced Organic Materials Engineering, Yeungnam University, Gyeongsan, 712-749, South Korea;2. Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, 790-784, South Korea;3. Department of Textile Engineering & Technology, Yeungnam University, Gyeongsan, 712-749, South Korea;4. Department of Chemical & Biological Engineering, Hanbat National University, Daejeon, 305-719, South Korea;5. Department of Chemical Engineering, Sungkyunkwan University, Suwon, 440-746, South Korea;6. School of Chemical Engineering, Yeungnam University, Gyeongsan, 712-749, South Korea;1. Arizona State University, School for Engineering Matter, Transport, and Energy, Tempe, AZ, 85287, USA;2. Colorado School of Mines, Department of Mechanical Engineering, Golden, CO 80401, USA;1. Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Lembah Pantai, 50603 Kuala Lumpur, Malaysia;2. Division of Manufacturing and Industrial Processes, Faculty of Engineering, University of Nottingham, Jalan Broga, 43500 Semenyih, Selangor, Malaysia;1. Departamento de Química Analítica y Análisis Instrumental, Spain;2. Institute for Advanced Research in Chemical Sciences (IAdChem) Universidad Autónoma de Madrid, 28049, Madrid, Spain;3. Instituto Madrileño de Estudios Avanzados (IMDEA) Nanociencia, Faraday, 9, Campus de Cantoblanco, 28049, Madrid, Spain;4. Departamento de Física Aplicada, Universidad Autónoma de Madrid, 28049, Madrid, Spain;1. Department of Materials Science and Engineering, Hongik University, Seoul 121-791, Republic of Korea;2. Department of Civil Engineering, Hongik University, Seoul 121-791, Republic of Korea;3. Display Materials and Components Research Center, Korea Electronics Technology Institute (KETI), Seongnam-si, Gyeonggi-do 463-816, Republic of Korea;4. Department of Advanced Materials Engineering, Kyonggi University, Suwon-si, Gyeonggi-do 16227, Republic of Korea;5. Department of Chemistry, Kookmin University, Seoul 136-702, Republic of Korea |
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| Abstract: | In this study, we investigate the optimization of printed (3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) as source/drain electrodes for organic thin film transistors (OTFTs) through electrohydrodynamic (EHD) printing process. The EHD-printed PEDOT:PSS electrodes should fulfill the prerequisites of not only high conductivity but also optimum surface tension for successful jetting. The conductivity of PEDOT:PSS was dramatically enhanced from 0.07 to 352 S/cm by the addition of dimethylsulfoxide (DMSO). To use the DMSO-treated PEDOT:PSS solution in the EHD printing process, its surface tension was optimized by the addition of surfactant (Triton X-100), which was found to enable various jetting modes. In the stable cone-jet mode, the patterning of the modified PEDOT:PSS solution was realized on the surface-functionalized SiO2 substrates; the printed line widths were in the range 384 to 81 μm with a line resistance of 8.3 × 103 Ω/mm. In addition, pentacene-based OTFTs employing the EHD-printed PEDOT:PSS as source and drain electrodes were found to exhibit electrical performances superior to an equivalent vacuum-deposited Au-based device. |
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| Keywords: | Organic thin-film transistor Electrohydrodynamic printing (3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) Bottom-contact OTFT Source/drain electrodes |
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