|Payment Terms:||L/C,T/T,Western Union|
|Supply Ability:||100000 Kilogram/Kilograms per Month|
|Place of Origin:||Hunan China (Mainland)|
|BOPP Stainless Steel:||250-325 mesh|
|Photoelectricity Conversion Efficiency:||Single Crystal Silicon≥19.3 ; Polysilicon≥18.2|
|Advantage1:||low warp degree|
|Advantage 2:||High Boiling Resistance|
|Delivery Detail:||Within 7 days after payment receipt|
|Packaging Detail:||2KG packed in one box, six boxes in to one carton (37x27x17.5cm)|
Aluminum Metallization Paste(LD7881A)
High boiling resistant
LEED LD7881A is an environmental Electronic aluminium paste developed to provide back contact metalization for solar cell, to mach with the TEC of silicon substrate well, it has the features of good print resolution, fine and smooth surface, high adhesion, low bow, energy conversion efficiency.
Main technical indicators and performance
Recommend 250~325mesh BOPP stainless steel screen. Recommend viscosity: 55-75 Pa·S when using 280mesh,50-70 Pa·S when using 300mesh. Stirring for 30min near the bottom of the vertical mixer, or 6h in roll mixer before use.
2.Control the printing wet weight:
0.75-0.90g on 125 single silicon, 1.20-1.50g on 156 polysilicon.
3. According to the wet weight above-mentioned: Dried thickness:
30-35μm. Fired thickness is 25-30μm
Infrared stove,about 3min,220-250°C. Quick stove, about 24-30s, 280-310°C.
5.Recommend Firing temperature(Despatch sintering furnace,the actual temperature of silicon substrate surface):
Average conversion efficiency: single crystal silicon≥18.70%, polysilicon ≥17.50%.
7.Alcohol wipe test:
Cotton ball moistened with alcohol and wipe the aluminum back surface field, no black powder.
125 single silicon≤1.5mm, 156 single/polysilicon≤ 2.0mm
9.Resistant to boiling:
Immersed cells in 70°C deionized water by 10min,take out and observe Aluminium back surface field.There are non-white, blistering, shedding and other undesirable phenomena, as well as no powder out or nigrescence wiped by alcohol.
Laminating fired cells,gash a 1cm wide EVA strip. Tensile testing is more than 10N and no shedding on Aluminium back surface.
11.Damp heat test:
Kept in an environment at a temperature of 85 °C, humidity of 85% for 48 hours, and at room temperature after 4 hours, than observe the Aluminium back surface. There are non-white, blistering, shedding and other undesirable phenomena.
12.Thermal cycling test:
Kept the cells in an environment at a temperature of -40 °C, humidity of 60% for 10 min,then heated to 85°C through 5 hours and retained for 10 minutes, temperature change rate between highest and lowest is no more than 100°C/h. This is a cycle. There is no shedding or serious cosmetic defects after 5 cycles.
After composed to modules, test it according to "Crystalline silicon terrestrial photovoltaic modules IEC61215", "PV module safety certification IEC61730", "flat photovoltaic panels UL1703". In the standard test conditions, the maximum output power attenuation meet the standard requirements, no serious cosmetic defects.
The viscosity is adjusted to good printability when produced. It is not recommended to add the thinner.so you must be very cautious to add it, then stir it uniformly.
Before the mass production,you must test the compatibility between Aluminium paste and wafer, Ag paste and Aluminium paste.
During transportation and storage should protect against the tide and contamination. Containers may be stored in a clean, dry and stable environment at room temperature (25(±5)°C), humidity ≤ 60% RH, with their lids tightly sealed to avoid direct sunlight.Avoid acid corrosion atmosphere, oil, dust particles atmosphere. The aluminium paste's shelf life is six months.