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Optimization of electrohydrodynamic-printed organic electrodes for bottom-contact organic thin film transistors.pdf

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Optimization of electrohydrodynamic-printed organic electrodes for bottom-contact organic thin film transistors.pdf

Organic Electronics 38 (2016) 48e54 Contents lists available at ScienceDirect Organic Electronics journal homepage: /locate/orgel Optimization of electrohydrodynamic-printed organic electrodes for bottom-contact organic thin ?lm transistors So Hyun Park a, 1, Jiye Kim b, 1, Chan Eon Park b, Jaewoong Lee c, Hwa Sung Lee d, ***, Sooman Lim e, **, Se Hyun Kim a, f, * a Department of Advanced Organic Materials Engineering, Yeungnam University, Gyeongsan, 712-749, South Korea b Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, 790-784, South Korea c Department of Textile Engineering Technology, Yeungnam University, Gyeongsan, 712-749, South Korea d Department of Chemical Biological Engineering, Hanbat National University, Daejeon, 305-719, South Korea e Department of Chemical Engineering, Sungkyunkwan University, Suwon, 440-746, South Korea f School of Chemical Engineering, Yeungnam University, Gyeongsan, 712-749, South Korea article info Article history: Received 18 June 2016 Received in revised form 30 July 2016 Accepted 31 July 2016 Available online 6 August 2016 Keywords: Organic thin-?lm transistor Electrohydrodynamic printing (3,4-ethylenedioxythiophene):poly(4styrenesulfonate) Bottom-contact OTFT Source/drain electrodes abstract In this study, we investigate the optimization of printed (3,4-ethylenedioxythiophene):poly(4styrenesulfonate) (PEDOT:PSS) as source/drain electrodes for organic thin ?lm transistors (OTFTs) through electrohydrodynamic (EHD) printing process. The EHD-printed PEDOT:PSS electrodes should ful?ll 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