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Proceedings Paper

Galvanic corrosion: a microsystems device integrity and reliability concern
Author(s): David C. Miller; William L. Hughes; Zhong Lin Wang; Ken Gall; Conrad R. Stoldt
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Paper Abstract

We have studied the corrosion of phosphorus-doped polySi when contacted to a gold metallization layer and exposed to various hydrofluoric acid (HF) based chemistries, including mixtures with HCl, C2H6O, H2O, NH4F, Triton-X-100, as well as vapor-based HF. Here, we utilize optical-, electron-, and atomic-force-microscopy, optical interferometry, as well as instrumented indentation ("nanoindentation") to characterize test and reference specimens exposed to the various HF solutions. These measurements provide information concerning the appearance, roughness, physical dimensions, hardness, elastic modulus, and reverse phase transformation activity of the various polysilicon specimens. In general, some of the chemistries produced time-dependent darkening or "staining" visibly seen on free surfaces, roughening and attack at grain boundaries, nano-scale pitting of the free surfaces, decrease in thickness, decrease in hardness and mechanical modulus, and diminished elbow and reverse excursion activity for those silicon specimens electrically connected to metal. Change in performance is attributed to the formation of a galvanic cell during the HF immersion, and the corresponding damage driven by an anodic current. The results here can be used to explain previous work, which focused on the change in performance of designated MEMS diagnostic structures.

Paper Details

Date Published: 5 January 2006
PDF: 12 pages
Proc. SPIE 6111, Reliability, Packaging, Testing, and Characterization of MEMS/MOEMS V, 611105 (5 January 2006); doi: 10.1117/12.644932
Show Author Affiliations
David C. Miller, Univ. of Colorado (United States)
William L. Hughes, Georgia Institute of Technology (United States)
Zhong Lin Wang, Georgia Institute of Technology (United States)
Ken Gall, Georgia Institute of Technology (United States)
Conrad R. Stoldt, Univ. of Colorado (United States)

Published in SPIE Proceedings Vol. 6111:
Reliability, Packaging, Testing, and Characterization of MEMS/MOEMS V
Danelle M. Tanner; Rajeshuni Ramesham, Editor(s)

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