• Title/Summary/Keyword: Solid Oxide

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Effect of the Hydrophobicity of Hybrid Gate Dielectrics on a ZnO Thin Film Transistor

  • Choi, Woon-Seop;Kim, Se-Hyun
    • Transactions on Electrical and Electronic Materials
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    • v.11 no.6
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    • pp.257-260
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    • 2010

  • Zinc oxide (ZnO) bottom-contact thin-film transistors (TFTs) were prepared by the use of injector type atomic layer deposition. Two hybrid gate oxide systems of different polarity polymers with silicon oxide were examined with the aim of improving the properties of the transistors. The mobility and threshold voltage of a ZnO TFT with a poly(4-dimethylsilyl styrene) (Si-PS)/silicon oxide hybrid gate dielectric had values of 0.41 $cm^2/Vs$ and 24.4 V, and for polyimide/silicon oxide these values were 0.41 $cm^2/Vs$ and 24.4 V, respectively. The good hysteresis property was obtained with the dielectric of hydrophobicity. The solid output saturation behavior of ZnO TFTs was demonstrated with a $10^6$ on-off ratio.

  • https://doi.org/10.4313/TEEM.2010.11.6.257 인용 PDF KSCI

Study on Electrochemical Performances of PEO-based Composite Electrolyte by Contents of Oxide Solid Electrolyte (산화물계 고체전해질 함량에 따른 PEO 기반 복합전해질 전기화학 성능 연구)

  • Lee, Myeong Ju;Kim, Ju Young;Oh, Jimin;Kim, Ju Mi;Kim, Kwang Man;Lee, Young-Gi;Shin, Dong Ok
    • Journal of the Korean Electrochemical Society
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    • v.21 no.4
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    • pp.80-87
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    • 2018

  • Safety issues in Li-ion battery system have been prime concerns, as demands for power supply device applicable to wearable device, electrical vehicles and energy storage system have increased. To solve safety problems, promising strategy is to replace organic liquid electrolyte with non-flammable solid electrolyte, leading to the development of all-solid-state battery. However, relative low conductivity and high resistance from rigid solid-solid interface hinder a wide application of solid electrolyte. Composite electrolytes composed of organic and inorganic parts could be alternative solution, which in turn bring about the increase of conductivity and conformal contact at physically rough interfaces. In our study, composite electrolytes were prepared by combining poly(ethylene oxide)(PEO) and $Li_7La_3Zr_2O_{12}$ (LLZO). The crystallinity, morphology and electrochemical performances were investigated with the control of LLZO contents from 0 wt% to 50 wt%. From the results, it is concluded that optimum content and uniform dispersion of LLZO in polymer matrix are significant to improve overall conductivity of composite electrolyte.

  • https://doi.org/10.5229/JKES.2018.21.4.80 인용 PDF HTML

Investigation on Mechanical Property and Adhesion of Oxide Films Formed on Ni and Ni-Co Alloy in Room and High Temperature Environments

  • Oka, Yoshinori I.;Watanabe, Hisanobu
    • Corrosion Science and Technology
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    • v.7 no.3
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    • pp.145-151
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    • 2008

  • Material degradation such as high temperature oxidation of metallic material is a severe problem in energy generation systems or manufacturing industries. The metallic materials are oxidized to form oxide films in high temperature environments. The oxide films act as diffusion barriers of oxygen and metal ions and thereafter decrease oxidation rates of metals. The metal oxidation is, however, accelerated by mechanical fracture and spalling of the oxide films caused by thermal stresses by repetition of temperature change, vibration and by the impact of solid particles. It is therefore very important to investigate mechanical properties and adhesion of oxide films in high temperature environments, as well as the properties in a room temperature environment. The oxidation tests were conducted for Ni and Ni-Co alloy under high temperature corrosive environments. The hardness distributions against the indentation depth from the top surface were examined at room temperature. Dynamic indentation tests were performed on Ni oxide films formed on Ni surfaces at room and high temperature to observe fractures or cracks generated around impact craters. As a result, it was found that the mechanical property as hardness of the oxide films were different between Ni and Ni-Co alloy, and between room and high temperatures, and that the adhesion of Ni oxide films was relatively stronger than that of Co oxide films.

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