• Title/Summary/Keyword: Nb-Si-B

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Effect of Substrate Temperature on the Optical and Electrical Properties of ITO Thin Films deposited on Nb2O5/SiO2 Buffer Layer (기판온도가 Nb2O5/SiO2 버퍼층위에 증착한 ITO 박막의 광학적 및 전기적 특성에 미치는 영향)

  • Joung, Yang-Hee;Kang, Seong-Jun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.20 no.5
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    • pp.986-991
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    • 2016

  • In this study, we prepared ITO thin films on $Nb_2O_5/SiO_2$ double buffer layer using DC magnetron sputtering method and investigated electrical and optical properties with various substrate temperatures (room temperature ~ $400^{\circ}C$). The resistivity showed a decreasing tendency, because crystallinity has been improved due to the enlarged grain size with increasing substrate temperature. ITO thin film deposited at $400^{\circ}C$ showed the most excellent value of resistivity and sheet resistance as $3.03{\times}10^{-4}{\Omega}{\cdot}cm$, $86.6{\Omega}/sq.$, respectively. In results of optical properties, average transmittance was increased but chromaticity ($b^*$) was decreased in visible light region (400~800nm) with increasing substrate temperature. Average transmittance and chromaticity ($b^*$) of ITO thin film deposited at $400^{\circ}C$ exhibited significantly improved results as 85.8% and 2.13 compared to 82.8% and 4.56 of the ITO thin film without buffer layer. Finally, we found that ITO thin film introduced $Nb_2O_5/SiO_2$ double buffer layer has a remarkably improved optical property such as transmittance and chromaticity due to the index matching effect.

  • https://doi.org/10.6109/jkiice.2016.20.5.986 인용 PDF KSCI

Electromagnetic Wave Absorption Characteristics of Nanocrystalline FeCuNbSiB Alloy Flakes/Polymer Composite Sheets with Different Flake Thickness

  • Lee, Tae-Gyu;Kim, Ju-Beom;Noh, Tae-Hwan
    • Journal of Magnetics
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    • v.14 no.4
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    • pp.155-160
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    • 2009

  • This study examined the effects of a decrease in thickness of magnetic alloy flakes on the electromagnetic wave absorption characteristics of nanocrystalline $Fe_{73.5}Cu_1Nb_3Si_{15.5}B_7$ (at.%) alloy flakes/polymer composite sheets available for a quasi-microwave band. The thickness of FeCuNbSiB alloy flakes decreased to 1-2 $\mu$m with increasing milling time up to 24 h, and the composite sheet including alloy flakes milled for 24 h exhibited considerably enhanced power loss properties in the GHz range compared to the sheets having non-milled alloy powders. Although a considerable increase in loss factor upon milling was observed in the narrow frequency range of 4-6 GHz, there was no correlation between the complex permeability and flake thickness. However, the complex permittivity increased with increasing milling time, and there was good agreement between the milling time and the frequency dependences of the complex permittivity and power loss.

  • https://doi.org/10.4283/JMAG.2009.14.4.155 인용 PDF KSCI