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Atom counting at surfaces.

D L Pappas, D M Hrubowchak, M H Ervin

    Science (New York, N.Y.)
    |January 6, 1989
    PubMed
    Summary

    Multiphoton resonance ionization coupled with ion bombardment achieves ultra-sensitive surface analysis. This technique detects indium dopants on silicon at 9 parts per trillion, a 100x improvement over prior methods.

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    Area of Science:

    • Materials Science
    • Surface Analysis
    • Analytical Chemistry

    Background:

    • Accurate dopant concentration measurement is crucial for semiconductor performance.
    • Existing surface analysis techniques have limitations in sensitivity and resolution.
    • Indium (In) is a key dopant in silicon (Si) based materials.

    Purpose of the Study:

    • To develop a highly sensitive method for quantifying indium dopant concentrations on silicon surfaces.
    • To establish a new benchmark for surface analysis detection limits.

    Main Methods:

    • Combined multiphoton resonance ionization with energetic ion bombardment.
    • Optimized experimental configuration for sampling and detection efficiency.
    • Minimized background noise for enhanced signal-to-noise ratio.

    Main Results:

    • Achieved a linear correlation between surface indium concentration and bulk values.
    • Established a detection limit of 9 parts per trillion for indium on silicon.
    • Demonstrated a mass resolution exceeding 160.
    • Enabled counting of as few as 180 surface atoms.

    Conclusions:

    • The combined technique offers unprecedented sensitivity for surface dopant analysis.
    • This method significantly surpasses previous surface analysis capabilities by a factor of 100.
    • The optimized approach provides a powerful tool for materials characterization and quality control.

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