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Conductive lead-free silver paste mixed with copper powder and aluminum powder for solar cell and preparation method of conductive lead-free silver paste
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A technology of solar cells and conductive silver paste, applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problem of affecting the uniformity of silver powder, increasing contact resistance, screen printing cracks, etc. problems, to achieve good economic benefits, reduce shrinkage, and high yield
Active Publication Date: 2014-07-30
CHINALAND SOLAR ENERGY
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Problems solved by technology
At present, the content of silver powder in the technical silver paste is higher than 70%, and the production cost is relatively high. Reducing the cost of silver paste is an important part of reducing the cost of solar cells, and it can also make solar cells have more market advantages; The particle size of the silver powder used in the existing silver paste is basically the same, so if the particle size of the silver powder is too large, cracks will appear in the screen printing, and the contact resistance will increase. If the particle size of the silver powder is too small, the silver powder will agglomerate Problems affect the uniformity of silver powder distribution, so it is necessary to effectively control the particle size of silver powder
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Embodiment 1
[0035] (1) Preparation of glass powder A
[0036] Take the following parts by weight of raw materials: B 2 O 3 20 parts, SiO 2 15 parts, ZnO 10 parts, CaO 6 parts, TiO 2 5 parts, BaO 4 parts, Na 2 4 parts of O, mixed evenly, placed in a high temperature muffle furnace at 1100℃ for sintering, kept for 45 minutes, then quenched with deionized water, ground, passed through a 240 mesh sieve, cooled, and kept at 700℃ for 5 hours, then, again Quench with deionized water, grind, and pass through sieve of different meshes. Collect 3μm glass powder, 15μm glass powder and 24μm glass powder respectively, then soak in 26% hydrochloric acid for 1.5 hours, then wash with deionized water until neutral , Dry for standby;
[0037] (2) Preparation of glass powder B
[0038] Take the following parts by weight of raw materials: SiO 2 15 copies, B 2 O 3 8 parts, BaO 6 parts, MgO 4 parts, AgO 2 3 copies, Y 2 O 3 4 copies, Co 2 O 3 2 parts, mixed uniformly, placed in a high temperature muffle fur...
Embodiment 2
[0056] (1) Preparation of glass powder A
[0057] Take the following parts by weight of raw materials: B 2 O 3 40 parts, SiO 2 12 parts, ZnO 8 parts, CaO 6 parts, TiO 2 4 parts, BaO 4 parts, Na 2 O 3 parts, mixed uniformly, put it in a high temperature muffle furnace at 1160℃ for sintering, keep for 45 min, then quench with deionized water, grind, pass through a 240 mesh sieve, cool, and keep at 700℃ for 6 hours, then, again Quench with deionized water, grind, pass through sieve of different meshes, collect 5μm glass powder, 12μm glass powder and 22μm glass powder respectively, then soak in 28% hydrochloric acid for 2 hours, then wash with deionized water until neutral , Dry for standby;
[0058] (2) Preparation of glass powder B
[0059] Take the following parts by weight of raw materials: SiO 2 20 copies, B 2 O 3 8 parts, BaO 6 parts, MgO 4 parts, AgO 2 3 copies, Y 2 O 3 4 copies, Co 2 O 3 2 parts, mixed evenly, put it in a high temperature muffle furnace at 1050℃ for sin...
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Abstract
The invention discloses a lead-free solar battery conductive silver paste mixed with copper and aluminum powder and a preparation method thereof. The silver paste prepared by the present invention does not contain lead, is less harmful to the human body and the environment, and fully meets the requirements of environmental protection; the present invention uses silver powder of the same particle size and other conductive particles to fill the gap between the silver powders in the silver paste, improving the The packing density of the film layer increases the contact area between the particles, reduces the shrinkage force of the film layer, thereby improving the conductivity of the silver paste; the present invention adds aluminum powder and copper powder to the conductive paste to help reduce the silver The production cost of the paste is reduced, and the conductivity of the silver paste is improved at the same time, thereby achieving the purpose of reducing the manufacturing cost of solar cells and achieving good economic benefits.
Description
technical field [0001] The invention relates to a lead-free solar cell conductive silver paste mixed with copper and aluminum powder and a preparation method thereof, belonging to the technical field of solar cellconductive paste preparation. Background technique [0002] The conductive silver paste of solar cells is prepared from silver powder, glass binder, organic solvent and other raw materials according to different ratios, in which silver powder is used as a conductive medium; glass binder is melted during high-temperature sintering, and forms between silver powder and silicon substrate. Ohmic contact; the organic solvent mainly plays the role of dispersing and wrapping, and the silver powder particles are uniformly [0003] Wrapped up, so that the silver powder in the conductive silver paste is not easy to precipitate and oxidize. [0004] At present, the glass binder used in the conductive silver paste of solar cells is a Bi-Si-Pb glass mixed powder. Although this...
Claims
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Application Information
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