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

Qin Jia Cai; Ye Gan; Chan-Park, Mary B.; Hong Bin Yang; Zhi Song Lu; Qun Liang Song; Chang Ming Li; Zhi Li Dong
September 2008
Applied Physics Letters;9/15/2008, Vol. 93 Issue 11, p113304
Academic Journal
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 cm2 V-1 s-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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