Main grid silver paste used in cooperation with front aluminum paste of N-type TOPCon battery and preparation method of main grid silver paste
A battery and aluminum paste technology, which is applied in the field of solar cells, can solve the problems of grid line falling off at overlapping joints, less P+ layer formation, and inability to achieve the effects of good printing and line width, reduced fine grid resistance, and excellent welding tension
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Embodiment 1
[0024] A busbar silver paste used in conjunction with the front aluminum paste of an N-type TOPCon battery is prepared from the following components according to the mass percentage:
[0025] Highly dispersed and highly active spherical silver powder 75%: spherical, particle size 0.3μm, D100<2μm, specific table 1.8-2.0, tap density 4.5g / ml, burning loss 0.5-0.55%, silver powder surface coating agent must be at 270℃ can be decomposed within;
[0026] Nano-silver powder 10%: the particle size is about 80nm, and can be sintered at a low temperature within 200°C;
[0027] Low-melting ultra-fine glass powder 1%: average particle size 0.5μm; softening point 310°C, composition is 65% lead fluoride, 20% calcium fluoride, 2% silicon oxide, 6% boron oxide, 1% aluminum oxide, Zinc oxide 6%;
[0028] Organic vehicle 11%: The main components are resin and solvent, which are mixed, heated, stirred, and boiled at a temperature of 80°C.
[0029] The resin accounts for 5% of the weight of t...
Embodiment 2
[0036] A busbar silver paste used in conjunction with the front aluminum paste of an N-type TOPCon battery is prepared from the following components according to the mass percentage:
[0037] Highly dispersed and highly active spherical silver powder 85%: spherical, particle size 0.5μm, D100<2μm, specific table 1.0-1.2, tap density 5.5g / ml, burning loss 0.4%, silver powder surface coating agent must be decomposed at 280°C Finish;
[0038] Nano-silver powder 1%: particle size 50nm, and low-temperature sintering can be completed at 200°C;
[0039] Low-melting ultra-fine glass powder 3%: average particle size 1μm; softening point 340°C, components are 90% lead oxide, 6% boron oxide, and 4% zinc oxide;
[0040] Organic carrier 8.5%: The main components are resin and solvent, which are mixed, heated, stirred, and boiled at 60°C;
[0041] The resin accounts for 15% of the weight of the carrier, containing 5% ethyl cellulose and 10% PVB resin;
[0042] The solvent is 85% of the we...
Embodiment 3
[0048] A busbar silver paste used in conjunction with the front aluminum paste of an N-type TOPCon battery is prepared from the following components according to the mass percentage:
[0049] Highly dispersed and highly active spherical silver powder 78%: spherical, particle size 0.4μm, D100<2μm, specific table 1.4-1.6, tap density 5g / ml, burning loss 0.5%, and silver powder surface coating agent can be decomposed within 270℃ Finish;
[0050] Nano silver powder 3%: particle size 30nm, and low temperature sintering can be completed at 200°C;
[0051] Low-melting ultra-fine glass powder 2%: average particle size 0.7μm; softening point 330°C, composition is lead fluoride 50%, bismuth oxide 20%, silicon oxide 6%, boron oxide 10%, aluminum oxide 2%, oxide Zinc 12%;
[0052] Organic carrier 12%: the main components are resin and solvent, mix, heat and stir the two, and boil at 70°C;
[0053] The resin accounts for 25% of the weight of the carrier, containing 5% ethyl cellulose, 1...
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