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Photolithographic mask alignment using moiré techniques.

M C King, D H Berry

    Applied Optics
    |February 2, 2010
    PubMed
    Summary
    This summary is machine-generated.

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    Quick alignment of photolithographic masks on silicon substrates is achieved using moiré patterns. This method provides precise direction and degree of misalignment information, enabling high accuracy for semiconductor manufacturing.

    Area of Science:

    • Semiconductor manufacturing
    • Materials science
    • Optics

    Background:

    • Accurate alignment of photolithographic masks to silicon wafers is critical for semiconductor device fabrication.
    • Current alignment methods can be time-consuming and may lack precision, especially with gaps between mask and wafer.

    Purpose of the Study:

    • To develop a rapid and accurate method for aligning photolithographic masks to silicon substrates.
    • To utilize moiré reflection patterns for real-time monitoring of misalignment during the alignment process.

    Main Methods:

    • Observing moiré reflection patterns generated by grids on the silicon wafer and photolithographic mask.
    • Analyzing a specific class of moiré patterns to determine both the direction and magnitude of misalignment.
    • Visual inspection of moiré patterns using standard mask-alignment equipment.

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    Main Results:

    • Achieved alignment accuracy of 0.2 micrometers.
    • Demonstrated effectiveness even with separations of 30 micrometers between the mask and wafer.
    • Confirmed that etched grids maintain their diffraction properties through reoxidation and epitaxial growth processes.

    Conclusions:

    • Moiré pattern analysis offers a fast and precise method for photolithographic mask alignment.
    • The technique is robust and compatible with standard semiconductor processing steps.
    • This approach enhances alignment accuracy and efficiency in silicon wafer fabrication.