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Broad Ion Beam “Slope Cutting” Technique for Cross Sectional SEM Specimen Preparation of Semiconductors

Published online by Cambridge University Press:  02 July 2020

R. Alani
Affiliation:
Gatan R&D, 5933 Coronado Lane, Pleasanton, CA, 94588, USA
W. Hauffe
Affiliation:
Dresden University of Technology, Mommsenstr. 13, D-01062 , Dresden, Germany
R. J. Mitro
Affiliation:
Gatan R&D, 5933 Coronado Lane, Pleasanton, CA, 94588, USA
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Extract

Cross sectional SEM specimens are routinely prepared for process monitoring/development, fabrication problem solving and failure analysis in semiconductor industries. A considerable variety of established methods are already in place for production of these specimens. They include: mechanical polishing, manual/automated cleaving, wet chemical etching and focused ion beam (FIB) milling. This report covers a new approach to the preparation of such specimens utilizing a broad ion beam technique. The technique consists of three steps, I) perpendicular “slope cutting” to expose the profile of the layers/features in the starting wafer, II) etching of the cut surface to delineate the microstructures and III) coating the specimen with a conductive thin film to prevent charging effects in the SEM. All three steps are carried out in a dedicated broad ion beam instrument, designed initially to etch and coat SEM specimens in one vacuum chamber [1]. The entire three-step process can be completed in one hour.

Type
Specimen Preparation Techniques for Materials Sciences
Copyright
Copyright © Microscopy Society of America

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References

References:

1.Alani, R., Mitro, R.J., & Hauffe, W. (1999). Conf. Proc, 25th. ISTFA p. 439448.Google Scholar
2.Hauffe, W. (1991), Sputtering by Particle Bombardment III (Behrich, and Wittmaak, , Eds.), Vol. 64, p.363.Google Scholar