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Sputter-depth profiling for thin-film analysis.

S Hofmann1

  • 1Max Planck Institute for Metals Research, Heisenbergstrasse 3, 70569 Stuttgart, Germany. s.hofmann@mf.mpg.de

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|August 13, 2004
PubMed
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Sputter-depth profiling analyzes thin films using two methods: analyzing removed matter or the remaining surface. Advanced techniques and models like MRI improve nanometer-scale depth resolution and quantification.

Area of Science:

  • Materials Science
  • Surface Science
  • Analytical Chemistry

Background:

  • Sputter-depth profiling is a key technique for thin-film analysis.
  • Two main approaches exist: analyzing removed material or the remaining surface.

Purpose of the Study:

  • To outline the concepts and current state of sputter-depth profiling.
  • To highlight improvements in experimental conditions and mathematical models for depth profiling.

Main Methods:

  • Characterization of removed matter (e.g., secondary-ion mass spectrometry, glow-discharge optical emission spectroscopy).
  • Characterization of the remaining surface (e.g., Auger electron spectroscopy, X-ray photoelectron spectroscopy).
  • Application of mathematical models, including the mixing-roughness-information (MRI) depth model.

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Main Results:

  • Modern instruments achieve nanometer-scale depth resolution.
  • The MRI model enables quantification of sputter-depth profiles, even with preferential sputtering.
  • Diffusion coefficients as low as 10(-22) m(2) s(-1) can be determined.

Conclusions:

  • Understanding ion-solid interactions is crucial for depth resolution.
  • Advanced methods like low-energy cluster ion bombardment push limitations to the atomic monolayer scale.
  • Sputter-depth profiling remains a powerful tool for thin-film characterization with ongoing advancements.