Electrodeposition of soft gold from a thiosulfate-sulfite bath for electronics applications

T. Osaka*, A. Kodera, T. Misato, T. Homma, Y. Okinaka, O. Yoshioka


研究成果: Article査読

105 被引用数 (Scopus)


The possibility of electrodeposition of soft gold from a thiosulfate-sulfite bath was explored for electronics applications. The bath does not contain cyanide, and it is operated at a near neutral pH and a mildly elevated temperature. The bath is stable, does not undergo spontaneous decomposition without the addition of any stabilizer, and yields gold deposits with a hardness sufficiently low for use as gold bumps on semiconductor devices. Factors affecting the hardness were investigated in detail. It is shown that the use of high concentrations of the complexing agents and/or the addition of thallium(I) ions decreases both hardness and sulfur content of the deposit. The lowest Vickers hardness values achieved were approxiraately 80 kg mm-2 in the as-deposited state and 50 kg mm-2 after annealing at 350°C for 30 min in air. The relationship between hardness and microstructure of the deposit was also examined.

ジャーナルJournal of the Electrochemical Society
出版ステータスPublished - 1997 10月

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学


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