Setup Wafers are non-product wafers used to verify tool alignment, recipe parameters, and equipment readiness before processing product wafers — confirming that the tool is correctly configured and producing expected results before committing valuable product material.

Setup Wafer Uses

• Alignment Verification: Lithography tool alignment (baseline correction, lens calibration) using setup wafers with alignment marks.
• Recipe Verification: Run a test wafer with the production recipe — verify output (CD, thickness, etch depth) matches specifications.
• Dummy Wafers: Fill empty slots in a cassette — ensure uniform gas flow and temperature across the batch.
• Send-Ahead: A wafer processed one step ahead of the lot — verify the next process step is ready.

Why It Matters

• Prevention: Better to detect a problem on a setup wafer than on 25 product wafers — setup wafers protect production.
• Productivity: Setup wafers consume capacity — efficient setup procedures minimize the overhead.
• Automation: Automated setup verification can reduce setup wafer consumption.

Setup Wafers are the test shots before production — verifying tool readiness and recipe correctness before committing product wafers to processing.