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Scribe-and-Break for Post Release MEMS Die Separation

[+] Author Affiliations
Thomas W. Wallner, Paul L. Bergstrom

Michigan Technological University

Andrew D. Oliver

Sandia National Laboratories

Paper No. IMECE2004-61667, pp. 329-335; 7 pages
doi:10.1115/IMECE2004-61667
From:
  • ASME 2004 International Mechanical Engineering Congress and Exposition
  • Electronic and Photonic Packaging, Electrical Systems Design and Photonics, and Nanotechnology
  • Anaheim, California, USA, November 13 – 19, 2004
  • Conference Sponsors: Electronic and Photonic Packaging Division
  • ISBN: 0-7918-4707-1 | eISBN: 0-7918-4178-2, 0-7918-4179-0, 0-7918-4180-4
  • Copyright © 2004 by ASME

abstract

We describe a post release die separation process for polysilicon surface micromachines using a combination of diamond scribing and breaking. The process resulted in yields above 80% for two types of electrostatic actuators. The paper describes the experimental apparatus and optimization of the process using a four parameter design of experiments. We determined that the two key parameters in the scribe-and-break process are the scribe force and the scribe angle. We also examined the theory of crack creation during the scribing process and determined experimentally that the crack depth in silicon is consistent with the theory developed for the scribing of glass.

Copyright © 2004 by ASME

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