Composition of lead-free conductive slurry for crystalline silicon solar cell and preparation method for lead-free conductive slurry
A technology of solar cells and conductive paste, applied in conductive materials, circuits, photovoltaic power generation, etc. dispersed in non-conductive inorganic materials, to achieve the effect of ensuring ohmic contact, reducing contact resistance, and good electrical conductivity
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Embodiment 1
[0017] The mass percentage is calculated as 70 parts of silver powder, 2.5 parts of organic binder, 27 parts of inorganic glass and 0.5 parts of inorganic additives, put them into a vacuum mixer, and keep stirring for about 2 hours to form a uniform mixture; then disperse through a three-roll mill , ground into a homogeneous slurry with a scraper fineness of ≤10 μm and a viscosity of 40-60 pa.s, and then filtered through a 225-mesh screen to obtain the silver conductive paste of the present invention.
Embodiment 2
[0019] The mass percentage is calculated as 60 parts of silver powder, 4.5 parts of organic binder, 35 parts of inorganic glass and 0.5 parts of inorganic additives, put them into a vacuum mixer, and keep stirring for about 2 hours to form a uniform mixture; then disperse through a three-roll mill , ground into a homogeneous slurry with a scraper fineness of ≤10 μm and a viscosity of 40-60 pa.s, and then filtered through a 225-mesh screen to obtain the silver conductive paste of the present invention.
Embodiment 3
[0021] The mass percentage is calculated as 65 parts of silver powder, 46 parts of organic binder, 328.5 parts of inorganic glass and 0.5 parts of inorganic additives, put them into a vacuum mixer, and keep stirring for about 2 hours to form a uniform mixture; then disperse through a three-roll mill , ground into a homogeneous slurry with a scraper fineness of ≤10 μm and a viscosity of 40-60 pa.s, and then filtered through a 225-mesh screen to obtain the silver conductive paste of the present invention.
[0022] In the three embodiments, the silver powder is a spherical silver powder with an average particle size of 0.5-1.5 μm, a specific surface area of 1.0-1.5%㎡ / g, and a tap density of 4.0-4.5g / ml. It can be purchased in the market; lead-free glass is SHBF-160 series low-melting glass, which is today's environmentally friendly low-melting glass; inorganic additives are made from Ti, Zn, Fe three metals, and Ti, Zn, Fe Choose one of the oxide powders, the average particle s...
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