A calibration wafer should produce the response the instrument method is designed to evaluate.
The standard must fit the inspection system, optical response, wafer handling and calibration procedure.
Start with the inspection platform
Identify the manufacturer, model, wafer size, detection mode, recipe and target particle-size range. Similar platform names do not guarantee identical requirements.
Select particle material deliberately
PSL spheres are widely used because of their controlled size and optical properties. Silica can be appropriate where a different refractive response, material durability or process representation is required. The selection should be tied to the calibration objective.
Define deposition and count
Specify whether the system requires isolated spots, full-surface distribution, multiple size bands, target counts or a patterned arrangement. “Standard wafer” is not a complete specification.
Require a usable certificate
The certificate should identify the wafer, particle material, nominal sizes, deposition method or target, traceability statement, relevant measurement results and handling limitations.
Need help matching equipment to the study?
Applied Physics can review the airflow area, test objective, desired visibility, operating duration and deployment constraints.
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