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Solution-processable organic-capped titanium oxide nanoparticle dielectrics for organic thin-film transistors

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8 Author(s)
Cai, Qin Jia ; School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore ; Gan, Ye ; Chan-Park, M.B. ; Yang, Hong Bin
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Oleic acid-capped titanium dioxide (OA-TiO2) nanoparticles were solution-processed to form homogeneous dielectrics for organic thin-film transistors (TFTs) of top-gate and bottom-gate configurations. The OA-TiO2 nanoparticles were well-dispersed into the organic solvent and spin-coated to give homogeneous films. These nanoparticle films showed a dielectric constant of about 5.3 and low leakage current density of ∼3×10-8 A/cm2 under an electric field of 1 MV/cm. Poly(3,3-didodecylquaterthiophene) and pentacene TFTs with OA-TiO2 dielectrics exhibited mobilities of 0.05±0.02 and 0.2±0.05 cm2V-1s-1, respectively, with on/off ratios of 103–105. This material appears to be useful for applications in printable organic TFTs.

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Applied Physics Letters  (Volume:93 ,  Issue: 11 )