Browsing by Author "Cho, H.K."

Filter results by typing the first few letters
Now showing 1 - 1 of 1
  • No Thumbnail Available
    Item
    High-Intensity Ultrasound-Assisted Low-Temperature Formulation of Lanthanum Zirconium Oxide Nanodispersion for Thin-Film Transistors
    (American Chemical Society service@acs.org, 2020) Pujar, P.; Madaravalli Jagadeeshkumar, K.K.; Naqi, M.; Gandla, S.; Cho, H.W.; Jung, S.H.; Cho, H.K.; Kalathi, J.T.; Kim, S.
    The process complexity, limited stability, and distinct synthesis and dispersion steps restrict the usage of multicomponent metal oxide nanodispersions in solution-processed electronics. Herein, sonochemistry is employed for the in situ synthesis and formulation of a colloidal nanodispersion of high-permittivity (?) multicomponent lanthanum zirconium oxide (LZO: La2Zr2O7). The continuous propagation of intense ultrasound waves in the aqueous medium allows the generation of oxidant species which, on reaction, form nanofragments of crystalline LZO at ?80 °C. Simultaneously, the presence of acidic byproducts in the vicinity promotes the formulation of a stable as-prepared LZO dispersion. The LZO thin film exhibits a ? of 16, and thin-film transistors (TFTs) based on LZO/indium gallium zinc oxide operate at low input voltages (?4 V), with the maximum mobility (?) and on/off ratio (Ion/Ioff) of 5.45 ± 0.06 cm2 V-1 s-1 and ?105, respectively. TFTs based on the compound dielectric LZO/Al2O3 present a marginal reduction in leakage current, along with enhancement in ? (6.16 ± 0.04 cm2 V-1 s-1) and Ion/Ioff (?105). Additionally, a 3 × 3 array of the proposed TFTs exhibits appreciable performance, with a ? of 3-6 cm2 V-1 s-1, a threshold voltage of -0.5 to 0.8 V, a subthreshold swing of 0.3-0.6 V dec-1, and an Ion/Ioff of 1-2.5 (×106). © © 2020 American Chemical Society.