Alloy powder for silicon solar cell aluminum paste

Abstract

The invention belongs to the technical field of electrode paste of solar cells, and particularly relates to alloy powder for silicon solar cell aluminum paste. The alloy powder comprises at least one type of first silicon aluminum alloy and at least one type of second silicon aluminum alloy. The mass content of silicon in the first silicon aluminum alloy is smaller than 12.73%, the mass content of the silicon in the second silicon aluminum alloy is larger than or equal to 12.73%, and both the melting point of the first silicon aluminum alloy and the melting point of the second silicon aluminum alloy are lower than 660 DEG C. Compared with the prior art, the alloy powder is added to the aluminum paste, so that conductive particles are firmly sintered together, surface contact resistance among aluminum particles is reduced, and the conductive performance of a thick film is excellent; formation of a deep doped p+ zone on a silicon wafer is facilitated and the conversion efficiency of a solar cell is improved; a sintering temperature window section is expanded, the manufacturability of a product is good, the technology sensibility of the defects such as aluminum beads, aluminum bubbles and dust generation in the sintering process of the aluminum paste is reduced, and the performance stability is improved.

Description

technical field [0001] The invention belongs to the technical field of solar cell electrode paste, and in particular relates to an alloy powder used for silicon solar cell aluminum paste. Background technique [0002] A solar cell is a device that directly converts light energy into electrical energy through the photoelectric effect or photochemical effect. Its working principle is: sunlight shines on the semiconductor p-n junction to form new hole-electron pairs. Holes flow to the p region, photogenerated electrons flow to the n region, and a current is formed after the circuit is turned on. Because it uses solar energy, an inexhaustible green energy source, under the environment of the global energy crisis, solar cells have attracted more and more attention from all countries, with an annual growth rate of more than 40%. [0003] Among solar cells, silicon solar cells have received the most research and attention. In the manufacturing process of silicon solar cells, the ...

AI Technical Summary

Problems solved by technology

However, when the aluminum paste of the prior art is sintered, because the sintering peak temperature can reach 830-850°C or even higher in an instant, it is very easy to cause local melting of Al, resulting in aluminum beads, aluminum cladding, and ash.