Silver coated copper conductor slurry for front electrode of solar battery and preparation method of silver coated copper conductor slurry

Abstract

The invention provides silver coated copper conductor slurry for a front electrode of a solar battery and a preparation method of the silver coated copper conductor slurry for the front electrode of the solar battery. The silver coated copper conductor slurry for the front electrode of the solar battery comprises a conductive phase, glass powder and an organic carrier, wherein the conductive phase is silver coated copper powder and silver powder which account for 68-85% of the total weight of the slurry, the glass powder is Bi-B-Zn-Si-Ti-Ba-Al-O glass powder which accounts for 5-10% of the total weight of the slurry, and the organic carrier accounts for 10-22% of the total weight of the slurry. The preparation method comprises the steps: mixing the silver coated copper powder, the silver powder and the glass powder; weighing the organic carrier to agitate adequately; then mixing the silver coated copper powder, the silver powder and the glass powder with the organic carrier; and then rolling the mixture to obtain the silver coated copper conductor slurry for the front electrode of the solar battery. According to the silver coated copper conductor slurry for the front electrode of the solar battery, the electric properties of the electrode greatly is improved, and the photoelectric conversion rate of the battery is enhanced. The maximum fineness of the silver coated copper conductor slurry for the front electrode of the solar battery is 15 microns, the average fineness of the silver coated copper conductor slurry is less than 7 microns, the solid content is 80-87%, and the viscosity is 200-100keps. The solar battery printed and sintered by the silver coated copper slurry has higher photoelectric conversion rate and low cost.

Description

technical field [0001] The invention relates to a silver-coated copper conductor paste for a front electrode of a solar cell and a preparation method thereof, belonging to the technical field of electronic paste. Background technique [0002] Conductive paste is a kind of electronic paste, which generally consists of conductive functional phase, binding phase and organic carrier. The conductive phase can be metal powder with good electrical and thermal conductivity such as gold, silver, platinum, and palladium, and the bonding phase is glass powder. Silver powder is widely used as the functional phase of conductive paste due to its good electrical and thermal conductivity and its low price compared to other precious metals. Traditional silver conductor paste is mainly used to form thick film circuits on ceramic substrates and ceramic components by screen printing. Due to the rapid development of solar cells in recent years, silver conductor paste has been widely used in th...

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Problems solved by technology

For example, Chinese invention application CN01118932A (conductive paste for front electrode of solar cell), CN101515604A (silver paste for solar cell and its preparation method), CN101609850A (lead-free silver conductor paste for front electrode of solar cell and its preparation process), CN101702416A (A preparation method of environment-friendly silicon-based solar cell positive silver paste), CN101271928A (high-viscosity solar cell front silver paste and its preparation method), CN101295739A (solar cell front electrode conductive paste and its preparation method), CN101630695A (lead-free and cadmium-free electrode paste for crystalline silicon solar cells and its preparation method), CN101359696A (silver conductive paste for solar cell front electrodes with good printing performance) and CN101651155A (a kind of silicon solar cell electrode plasma Composition and preparation method), etc., these documents all involve the improvement of the paste formulation, these formulations can improve certain performances of solar cells to a certain extent, but this is only to improve the performance of the battery from the perspective of the glass phase, all There is no mention of improving the conductive phase of the paste, and the conductive phase determines the electrical and mechanical properties and production costs of the paste, which limits the continued development of conductive paste for solar cell electrodes

[0004] The existing conductive silver paste is generally made of raw materials such as silver powder, inorganic adhesive, organic resin and organic solvent according to different proportions. Photoelectric conversion efficiency of solar cells

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