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        Solid cross linked-poly(ethylene oxide) electrolyte gate dielectrics for organic thin-film transistors

        Sungmin Cho,Dongkyu Kim,Yeongkyu Yun,Jeongyeon Lee,Taeshik Earmme,SungYong Seo,Choongik Kim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.92 No.-

        Solid polymer electrolyte gate dielectric based on cross-linked poly(ethylene oxide) (CPEO) was developed and employed for organic thin-film transistors (OTFTs). Mechanical stability, high areal capacitance, and amorphous morphology of CPEO were achieved via the use of polyhedral oligomeric silsesquioxane (POSS) as cross-linker, dissolved ion [EMIM][TFSI] as electrolyte, and PEO with low molecular weight as polymer matrix, respectively. The resulting solid polymer electrolyte showed excellent insulating properties with low leakage current density (1.8 × 10−7 A cm−2 at 1 V) and high capacitance per area (∼ 1 μF cm−2 at 100 Hz). Furthermore, dielectric properties of the developed polymer electrolytes including ionic conductivity as well as segmental relaxation time were investigated. The polyelectrolyte dielectric was employed for bottom-gate/top-contact organic thin-film transistors and the resulting devices showed decent electrical performance with a carrier mobility of 0.12 (±0.03) cm2 V−1 s−1 and a current on/off ratio of 103 at low operating voltage of 5 V.

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