1．Product Description
▶ High efficiency
▶ Fine grid line printing，high aspect ratio
▶ High solderability and high adhension
▶ Suitable for PERC and black silicon cells
▶ Suitable for knotless screen printing
2．Typical Characteristics
|
Product Properties |
TestCondition |
SPEC |
|
Viscosity(Pa·S) |
Brookfield,SC4-14/6R utility cup and spindle，at 10 rpm，25±1℃ |
50~400 |
|
Solid(%) |
At 700℃,15min |
91±2 |
|
Shelf life (month) |
Unopened |
6 |
3．Recommendations
3.1 Printing
Screen Parameters
|
Screen Parameter |
Unit |
Conventional Screen |
Knotless Screen |
|
Mesh count |
count |
360 |
380 |
430 |
290 |
325 |
|
Wire diameter |
μm |
16 |
14 |
13 |
20 |
16 |
|
Mesh opening |
μm |
28~32 |
25~28 |
|
Emulsion thickness |
μm |
10~16 |
The above parameters are for reference only, the final results of the customers’ debugging shall prevail.
3.2 Drying
Infrared heat, 120~350℃, 1min, or optimized by customers.
3.3 Firing
This product has a wide range of firing temperature. The peak temperature is 10-40 degree lower than conventional , when used in PERC cells. Customers can optimize the sintering process. The following sintering process for customers’ reference, the temperature in the diagram is the actual temperature of the silicon wafer.
3.4 Welding
Welding technique: manual or automatic welding
Coating of welding strip : Sn-Pb or Sn-Pb-Ag
3.5 Paste Preparation
Stirring：The silver paste should be thoroughly mixed before use. It needs to gently hand stirring 3 to 5 minutes with a spatula. It should be mixed 3 to 5 minutes with a planetary mixer, if not used a long time.（Note: Improper stirring may change the rheology of the paste and its printing characteristics.）
Dilution：Dilution is not necessary, if you need, please use the thinner we recommend.
3.6 Storage and Safety
Storage: Storage in stable environment at 5℃-25℃.Storage in high temperature(>25℃) or in low temperature(<5℃) could cause irreversible changes in the material.
Shelf life: The shelf life of 6 months(unopened),if used, please canned and stamped tape to save, the shelf life should not exceed 7 days.
Safety: Please refer to the product MSDS.
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