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Mechanical Effects of Galvanic Corrosion of Thin Film Polysilicon

[+] Author Affiliations
David C. Miller, Conrad R. Stoldt

University of Colorado at Boulder

Ken Gall

Georgia Institute of Technology

Paper No. IMECE2005-79295, pp. 325-334; 10 pages
doi:10.1115/IMECE2005-79295
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Microelectromechanical Systems
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Microelectromechanical Systems Division
  • ISBN: 0-7918-4224-X | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

Mechanical, and electrical effects generated by the galvanic corrosion of polysilicon immersed in various hydrofluoric acid (HF)-based solutions are described. Micromachined test structures consisting of phosphorus-doped polysilicon in contact with a gold metallization layer are utilized. A suite of otherwise identical test (metal added) and reference (no metal) structures were used to investigate changes in key performance parameters. Corroded test structures demonstrate an increase in through-thickness strain gradient, a decrease in the characteristic frequency of mechanical resonance, no change in in-plane strain, greatly increased electrical resistance, a decrease in hardness, and a decrease in elastic modulus. Noteworthy results were observed for aqueous-hydrochloric acid, ethanol, water, ammonium fluoride (found in buffered oxide etchant), Triton-X-100, as well as vapor-HF based chemistries. This first systematic study validates preliminary experiments and demonstrates the impact of corrosion on miniaturized structures, indicating a potential influence upon the material properties, design, performance, fatigue, tribology (friction/ wear), manufacture, and packaging of micro-and nano-scale devices.

Copyright © 2005 by ASME

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