Mechanical properties of Sn electrodeposited in supercritical CO2 emulsions using micro-compression test

Mana Tanabe, Tso Fu Mark Chang, Takashi Nagoshi, Sung Ting Chung, Wen Ta Tsai, Hideki Hosoda, Tatsuo Sato, Masato Sone

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

This paper reports mechanical properties of Sn films electrodeposited by the conventional method (CONV) and supercritical CO2 emulsions (EP-SCE). Sn is often used in electric devices as solders and load bearing components. Defects formed in the Sn structures could be fatal and can cause malfunction or shorten life time of the devices. Therefore, it is necessary to investigate the mechanical properties to understand the reliability and life time. The Sn films were prepared in an electrolyte of the acid Sn solution. Sn pillars for mechanical properties measurement were fabricated by focused ion beam and evaluated by a micro-compression test. Yield strength of the CONV pillar was higher than that of the EP-SCE pillar. Grain size of the EP-SCE film was about 60 μm, which was much larger than the CONV film. Moreover, presence of SnO2 in the CONV film by was confirmed by X-ray photoelectron spectroscopy. Therefore, the high purity of Sn and the large crystal size are believed to be the main causes for the lower strength of the EP-SCE pillar when compared to the CONV pillar.

Original languageEnglish
Pages (from-to)219-222
Number of pages4
JournalMicroelectronic Engineering
Volume141
DOIs
Publication statusPublished - 2015 Jun 15

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering

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