• Title/Summary/Keyword: nano-sized diamond

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Effects of Nano-sized Diamond on Wettability and Interfacial Reaction for Immersion Sn Plating

  • Yu, A-Mi;Kang, Nam-Hyun;Lee, Kang;Lee, Jong-Hyun
    • Journal of the Microelectronics and Packaging Society
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    • v.17 no.3
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    • pp.59-63
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    • 2010
  • Immersion Sn plating was produced on Cu foil by distributing nano-sized diamonds (ND). The ND distributed on the coating surface broke the continuity of Sn-oxide layer, therefore leading to penetrate the molten solder through the oxide and retarding the wettability degradation during a reflow process. Furthermore, the ND in the Sn coating played a role of diffusion barrier for Sn atoms and decreased the growth rate of intermetallic compound ($Cu_6Sn_5$) layer during the solid-state aging. The study confirmed the importance of ND to improve the wettability and reliability of the Sn plating. Complete dispersion of the ND within the immersion Sn plating needs to be further developed for the electronic packaging applications.

Characteristics of a Polycrystalline Diamond Thin Film Deposited on a-plane Sapphire Substrate (a-plane 사파이어기판에 증착된 Polycrystalline Diamond 박막의 특성)

  • Tan, Xing Yan;Jang, Tae Hwan;Kwon, Jin Uk;Kim, Tae Gyu
    • Journal of the Korean institute of surface engineering
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    • v.53 no.3
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    • pp.109-115
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    • 2020
  • In this study, polycrystalline diamond was synthesized by chemical vapor deposition (CVD). Diamond films were deposited on a-plane sapphire substrates while changing the concentration of methane for hydrogen (CH4/H2), and the concentrations of methane were 0.25, 0.5, 1, 2, 3 and 4 vol%, respectively. Crystallinity and nucleation density according to changes in methane concentration were investigated. At this time, the discharge power, vacuum pressure, and deposition time were kept constant. In order to deposit polycrystalline diamond, the sapphire substrate was etched with sulfuric acid and hydrogen peroxide (ratio 3:7), and the sapphire surface was polished for 30 minutes with 100 nm-sized nanodiamond particles. The deposited diamond thin film was analyzed by a scanning electron microscope (SEM), a Raman spectra, Atomic force microscope (AFM) and an X-ray diffractometer (XRD). By controlling the ratio of methane to hydrogen and performing appropriate pre-treatment conditions, a polycrystalline diamond thin film having excellent crystallinity and nucleation density was obtained.