Conductive paste for solar cells and preparation method thereof, and preparation method of solar cell sheet
A technology for solar cells and solar cells, applied in conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc., can solve the problems of high photoelectric conversion efficiency of cells, good cell performance, etc. Conducive to mass production and cost control
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[0023] The invention also provides a preparation method of the conductive paste for solar cells, comprising the steps of: mixing metal powder, glass powder and an organic carrier, wherein the metal powder is boron-aluminum alloy powder. Specifically, it can be described as: mixing and firing oxide powders and ball milling to make inorganic glass powder; dissolving thickeners in organic solvents to make organic carriers; mixing spherical or quasi-spherical boron-aluminum alloy powders with different particle sizes to make Conductive metal powder; then mixing and grinding the inorganic glass powder, organic carrier and metal powder obtained above to obtain a conductive paste for solar cells.
[0024] The present invention also provides a method for preparing a solar cell, comprising the steps of: screen-printing the silver electrode on the back, drying, then printing the back-field conductive paste by screen-printing, drying, and then screen-printing the silver electrode paste on...
Embodiment 1
[0029] (1) Preparation of inorganic glass powder
[0030] Take 54gBi 2 o 3 , 22gB 2 o 3 , 14gSiO 2 , 5gZnO, 2.5gAl 2 o 3 , 1.5gSb 2 o 3 , 1.0gBaO, use a V-shaped mixer to mix the above ingredients evenly, put it into a porcelain crucible and put it into a silicon carbide rod furnace, heat it up to 550°C and keep it for 0.5h, then heat it up to 1300°C for 1.0h, water After quenching and filtering, put the obtained glass beads into a ball mill tank, control the mass ratio of zirconia balls: glass beads: deionized water = 4:1:0.5, tank speed 100 / min, ball mill for 7 hours, filter, dry, and then dry mill 0.5h, the mass ratio of zirconia balls to glass beads is 1:2 during dry grinding; the medium particle size D of the inorganic glass powder is measured 50 It is 1.32μm, and the softening point is 670℃;
[0031] (2) Configuration of organic carrier
[0032] According to the mass ratio of terpineol: butyl carbitol: butyl carbitol acetate: dibutyl phthalate = 45:40:10:5, th...
Embodiment 2
[0036] In the embodiment 1 step (3), "accounting for 62g medium particle size D 50 5.0μm with a particle size D of 13g 50 Two kinds of boron-aluminum alloy powders with different medium particle sizes of 2.0 μm" changed to "75g medium particle size D 50 A boron-aluminum alloy powder with a particle size of 10.0 μm, and the rest are the same as in Example 1 to obtain the finished conductive paste S2.
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