Optical Inspection

12 Metrology, Inspection & Characterization

Notation OI

Definition

Inspection that uses optical illumination, imaging, and photodetection to detect and classify wafer-surface, particle, and pattern anomalies without relying solely on electron-beam imaging.

Application

Used inline on patterned and unpatterned semiconductor wafers for defect discovery, excursion monitoring, and yield/process control, with SEM review often used separately for higher-resolution follow-up.

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optical wafer inspection

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