PV Ribbon Solder Coatings and Joining Temperature
Select a solder coating around the cell metallization, ribbon construction and stringing process. Compare coating flow, joint strength and electrical resistance within a defined thermal window, then verify the selected interconnect in the module.
On this page
Define the coating and ribbon
- Identify the coating alloy, thickness or coating mass, base conductor and finished dimensions. Alloy designation and layer geometry provide the basis for comparing solder-coating options.
- Separate the alloy melting range, equipment setpoint and temperature measured at the joint. Record the method and location used to measure the thermal profile.
Build the soldering window
- Match heat input, dwell time, contact pressure and cooling to the cell metallization and equipment guidance. Include ribbon tension, alignment, flux and other process aids in the trial record.
- Evaluate wetting, coating flow and contact coverage across the intended process window. Check the effect of feeding, forming and springback on ribbon placement and cell handling.
Measure the finished joint
- Measure peel strength using a defined direction, speed and specimen condition. Record the failure location together with contact resistance and the cell inspection result.
- Compare the candidate coating with the reference ribbon on the same cell type and process. Inspect the joints and cell condition at the centre and limits of the selected process window.
Evaluate the module
- Use the selected cell, ribbon, coating and joining process as the bill of materials for module qualification. Evaluate resistance, cell damage and the reliability tests specified for that module.
- Joining temperature and service temperature describe different conditions. Service performance is evaluated on the complete joint and module through the applicable thermal and environmental test plan.
Transfer the process to production
- The production specification identifies the coating alloy and build, conductor dimensions, mechanical condition, packaging and inspection requirements. Keep the accepted sample and process settings traceable to that revision.
- Changes to alloy, coating, conductor or equipment settings are evaluated against joint quality and module requirements before the revised process is released.
Solder coating and process trial inputs
Add your project inputs, then download the worksheet or send it with an inquiry. The fields start blank; entries are your requirements and observations.
Scroll horizontally to read all columns. Keep the conditions and units with each value.
| Item | Information / units | Your input |
|---|---|---|
| Coating identity | Candidate/reference alloy composition, supplier designation and coating thickness | |
| Material route | Core/cladding, grade, condition and bare/finished dimensions | |
| Cell and equipment | Metallization, cell design, stringer/heater/fixture and flux | |
| Joining settings | Measured thermal profile, dwell, pressure, speed and cooling | |
| Wetting and bond | Wetting criterion, peel angle/speed/fixture, failure location and accepted limits | |
| Cell stress | Reference/changed ribbon and cell lots, before/after EL, handling and restraint | |
| Reliability | Required module/assembly test method, conditions, duration and acceptance | |
| Trial disposition | Measured results, deviations, reviewer, approved specification and change control |
Drafts are stored only in this browser when you choose Save. Clear inputs also removes the saved draft. Worksheet version: RT-RFQ-WORKSHEET-1.
Question and answer
How should a lower-temperature solder coating be compared?
Compare it with the reference coating on the same cell, ribbon and equipment. Use the measured joint-temperature profile, wetting, peel strength, resistance and cell inspection results to define the working window, then evaluate the selected module construction.