FIB-induced damage in silicon

Authors: RUBANOV, S.¹; MUNROE, P. R.²

Source: Journal of Microscopy, Volume 214, Number 3, June 2004 , pp. 213-221(9)

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Abstract:

Summary

The damage created in silicon transmission electron microscope specimens prepared using a focused ion beam miller is assessed using cross-sections of trenches milled under different beam conditions. Side-wall damage consists of an amorphous layer formed by direct interaction with the energetic gallium ion beam; a small amount of implanted gallium is also detected. By contrast, bottom-wall damage layers are more complex and contain both amorphous films and crystalline regions that are richer in implanted gallium. More complex milling sequences show that redeposition of milled material, enriched in gallium, can occur depending on the geometry of the mill employed. The thickness of the damage layers depends strongly on beam energy, but is independent of beam current. Monte Carlo modelling of the damage formed indicates that recoil silicon atoms contribute significantly to the damaged formed in the specimen.

Keywords: FIB; ion damage; silicon; specimen preparation

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.0022-2720.2004.01327.x

Affiliations: 1: School of Physics, University of Melbourne, Victoria 3010, Australia 2: Electron Microscope Unit, University of New South Wales, Sydney, NSW2052, Australia

Publication date: 2004-06-01