Photomask and method for evaluating an initial calibration...

Radiation imagery chemistry: process – composition – or product th – Radiation modifying product or process of making – Radiation mask

Reexamination Certificate

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C430S030000, C430S296000, C430S942000, C382S144000

Reexamination Certificate

active

06861181

ABSTRACT:
A photomask and method for evaluating an initial calibration for a scanning electron microscope are disclosed. The method includes generating an initial calibration for a SEM that contains a target width for a feature on a reference target and measuring the feature on the reference target in the SEM to determine a measured width for the feature. The measured width is compared to the target width to generate a shift deviation and a current calibration for the SEM is adjusted based on the shift deviation.

REFERENCES:
patent: 6573497 (2003-06-01), Rangarajan et al.
patent: 6635874 (2003-10-01), Singh et al.
Presentation at SPIE Lithography Conference Entitled “Photomask Critical Dimension Metrology”, St. Johns, Virgin Islands, 28 Pages, Dec. 8, 2000.

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