結晶粒界品質制御によるAl薄膜配線のマイグレーション耐性向上法に関する検討

  • 赤崎 翔太
    東北大学 大学院工学研究科ファインメカニクス専攻
  • 鈴木 研
    東北大学 大学院工学研究科先端材料強度科学研究センター
  • 三浦 英生
    東北大学 大学院工学研究科先端材料強度科学研究センター

書誌事項

タイトル別名
  • Improvement of the Electromigration Resistance of Al Thin-Film Interconnection by Controlling the Crystallinity of Grain Boundaries

抄録

<p>The degradation process of the crystallinity of grain boundaries in Al thin-film interconnections was visualized by applying EBSD analysis under high current density. The grain boundary diffusion was accelerated by electromigration only along random grain boundaries with low crystallinity. The crystallinity (IQ value obtained from EBSD analysis) of grain boundaries varied drastically as strong functions of manufacturing process such as deposition method, temperature of thin-film deposition, gas pressure during the deposition, substrate material, and so on. The effective activation energy of self-diffusion of component element along random grain boundaries was found to be dominated by the crystallinity of random grain boundaries. The measured activation energy obtained from the low-crystallinity interconnections was much lower than that obtained from the thermodynamically stable bulk material, and therefore, the diffusion constant due to electromigration was drastically increased, resulting in the drastic decrease of the lifetime of the interconnections. The lifetime of the interconnections was, therefore, improved by increasing the crystallinity of grain boundaries.</p>

収録刊行物

  • 年次大会

    年次大会 2022 (0), J011-05-, 2022

    一般社団法人 日本機械学会

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