Troubleshoot PV Ribbon Soldering and Handling
Compare affected and unaffected cell and ribbon lots. Record the symptom, process settings and test result, then check coating, wetting, mechanical properties or handling against the failure observed.
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Investigate the symptom with controlled comparisons
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| Symptom | Check first | Evidence to send |
|---|---|---|
| Low peel strength | Wetting, coating, contamination, cell metallization and joining profile | Cell/ribbon lot IDs, peel angle/speed/fixture, failure location and settings |
| Cell cracks or EL defects | Ribbon condition and geometry, handling, pressure, thermal profile and restraint | Before/after EL images, cell thickness/design, ribbon geometry and trial settings |
| Feeding or placement stops | Camber/straightness, winding pattern, spool fit, tension and guiding | Spool and line photos, dimensions, stop locations and equipment settings |
| Corrosion or discoloration | Coating coverage, residues, encapsulation and moisture paths | Affected/reference samples, exposure history, surface images and material records |
Record the trial and order basis
Keep the drawing revision, sample identifiers, method, test conditions, acceptance limits and measured results together. Resolve open fields with the specification owner before comparing offers or releasing a changed construction.