Short answer: Full deposition distributes a reference particle population across the wafer; spot deposition places one or more localized populations at defined positions. The right configuration depends on whether the inspection method is checking global scan behavior, localized size response, multiple sizes or a tool-specific recipe.
Decision rule: Select the deposition pattern from the inspection objective and tool procedure—not from whichever product is easier to describe.
Full deposition applications
A full deposition can support a scan-wide response or uniformity check because known particles are distributed across the surface. The target density and usable range should match the inspection tool and recipe so the wafer produces interpretable counts without excessive overlap.
Spot deposition applications
Localized spots can place known particle sizes at defined positions, allowing multiple sizes or targeted checks on one wafer. The tool must reliably locate and scan the spots, and the protocol must preserve orientation and spot identification.
Single-size and multi-size decisions
A single-size full deposition is often simpler for a focused size-response or scan-uniformity task. A multi-spot wafer can reduce handling when several sizes are needed, but it adds recipe, orientation and data-interpretation requirements.
Density and count range
Too few deposited particles can make the result statistically weak; too many can create overlap, coincidence or inspection saturation. Specify the expected density or count range using the tool method and manufacturer guidance.
Packaging and identification
Spot wafers require clear orientation and a spot map. Full-deposition wafers require protection from added contamination that would alter the background. Define carrier, labeling, handling and certificate content with the quote.
Working checklist
- Inspection-system model
- Wafer diameter and substrate
- PSL or silica
- Nominal particle size or sizes
- Full or spot deposition
- Target density/count range
- Spot map and orientation
- Certificate and packaging
What to include in the RFQ
Provide the inspection-tool model, wafer diameter, particle material, size or sizes, full/spot pattern, target count range and certificate requirements.
Use the GSE technical RFQ to submit the requirement, attachments, destination and required-on-site date.
Match the deposition pattern to the inspection objective
Full deposition supports broad-field response and uniformity checks. Spot deposition can support localized sensitivity, coordinate verification or repeated scanning of a defined region. The better choice depends on the inspection tool, recipe, mapping strategy and what the calibration or challenge must demonstrate.
Specify wafer diameter, substrate type, particle material and size, deposition pattern, target density, usable area, edge exclusion and certificate data together. A correct particle size on the wrong pattern may not answer the tool-performance question.
Continue the topic: Semiconductor Calibration Knowledge Center.
Authoritative references
This guide translates public requirements and technical concepts into purchasing and study-planning questions. The controlling standard, regulation, site procedure and quality approval remain authoritative.
Frequently asked questions
Is full deposition always better for uniformity checks?
It is commonly suited to scan-wide checks, but the tool procedure and target density control the decision.
Can several particle sizes be placed on one wafer?
Yes, localized spot patterns can support multi-size configurations when the tool recipe and orientation controls are defined.
Why specify target density?
Density affects count statistics, overlap and the inspection system’s ability to resolve the reference population.
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