Damage assessment of a wafer using optical metrology

Details Damage assessment of a wafer using optical metrology Damage assessment of a wafer using optical metrology

2006-03-30

2009-11-24

Feliciano, Eliseo Ramos (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Quality evaluation

C702S127000, C702S128000, C702S183000, C438S016000

Reexamination Certificate

active

07623978

ABSTRACT:
A method of assessing damage of a dual damascene structure includes obtaining a wafer after the wafer has been processed using a dual damascene process. A first damage-assessment procedure is performed on the wafer using an optical metrology process to gather damage-assessment data for a first set of measurements sites on the wafer. For each measurement site in the first set of measurement sites, the optical metrology process determines an amount of damage of a damaged area of a periodic grating in the measurement site. The damage-assessment data includes the amount of damage determined by the optical metrology process. A first damage-assessment map is created for the dual damascene process. The first damage-assessment includes the damage-assessment data and the locations of the first set of measurement sites on the wafer. One or more values in the damage-assessment map are compared to damage-assessment limits established for the dual damascene process to identify the wafer as a damaged or undamaged wafer.

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