Solar cell front sliver paste powder adaptable to high sheet resistance and shallow junction
A solar cell and silver paste technology, which is applied to conductive materials, circuits, and electrical components dispersed in non-conductive inorganic materials, can solve problems affecting the sintering of front-side silver paste, and achieve high photoelectric conversion efficiency and excellent electrode structure. Dense and consistent appearance
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Embodiment 1
[0015] A powder material for front silver paste of solar cells suitable for high square resistance and shallow junction, its composition and weight percentage are: coarse silver powder with an average particle size of 2-5 μm 50%, fine silver powder with an average particle size of 0.5-2 μm Silver powder 45%, glass powder 4.9%, additive 0.1%. Among them, the thick and fine silver powders are all spherical or quasi-spherical, and the tap density is >5.5g / cm 3 The softening point of the glass powder is 380-480°C. The composition and weight percentage of the glass powder are: lead oxide 65%, aluminum oxide 5%, silicon oxide 10%, zinc oxide 10%, magnesium oxide 10%; glass powder has Bimodal particle size distribution, fine glass powder with an average particle size of less than 0.5 μm accounts for 10% by weight, and coarse glass powder with an average particle size of 0.5-5 μm accounts for 90%; the additive is tin, which has a bimodal particle size distribution , additives with an...
Embodiment 2
[0017] A powder material for front silver paste of solar cells suitable for high square resistance and shallow junction, its composition and weight percentage are: 75% of coarse silver powder with an average particle size of 2-5μm, fine silver powder with an average particle size of 0.5-2μm Silver powder 20%, glass powder 2%, additive 3%. Among them, the thick and fine silver powders are all spherical or quasi-spherical, and the tap density is >5.5g / cm 3 The softening point of the glass powder is 380-480°C. The composition and weight percentage of the glass powder are: 85% lead oxide, 5% aluminum oxide, 1% silicon oxide, 4% zinc oxide, and 5% magnesium oxide; the glass powder has Bimodal particle size distribution, fine glass powder with an average particle size of less than 0.5 μm accounts for 35% by weight, and coarse glass powder with an average particle size of 0.5-5 μm accounts for 65%; the additive is copper, which has a bimodal particle size distribution , additives wi...
Embodiment 3
[0019] A powder material for front-side silver paste of solar cells suitable for high square resistance and shallow junction, its composition and weight percentage are: 62% of coarse silver powder with an average particle size of 2-5 μm, fine silver powder with an average particle size of 0.5-2 μm Silver powder 27%, glass powder 9%, additive 2%. Among them, the thick and fine silver powders are all spherical or quasi-spherical, and the tap density is >5.5g / cm 3 The softening point of the glass powder is 380-480°C. The composition and weight percentage of the glass powder are: 81% lead oxide, 2% aluminum oxide, 9% silicon oxide, 1% zinc oxide, and 7% magnesium oxide; the glass powder has Bimodal particle size distribution, fine glass powder with an average particle size of less than 0.5 μm accounts for 15% by weight, and coarse glass powder with an average particle size of 0.5-5 μm accounts for 85%; the additive is nickel, which has a bimodal particle size distribution , addit...
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