Alloy silver powder and its preparation method and solar conductive paste prepared therefrom

Abstract

The invention discloses alloy silver powder, a preparation method thereof and solar conductive slurry prepared therefrom. The alloy silver powder is made of one or more kinds of metal such as Ag, Au, Pd, Cu, Ni, Al, Mn, Mg and Bi; wherein one or more kinds of the Ag, the Au, the Pd, the Cu, the Ni, the Al, the Mn, the Mg and the Bi account for 0.1-10wt% and the rest is silver. The alloy silver powder is prepared by use of a liquid-phase chemical reduction method of alloy. The solar conductive slurry comprises following components in parts by weight: 50-85wt% of pure silver powder, 5-40wt% the alloy silver powder, 1-10wt% of unorganic glass powder, and 5-10wt% of organic carriers. By use of the alloy silver powder, for the solar conductive slurry prepared therefrom, the cell conversion efficiency is quite high and the welding adhesive force of a solar cell electrode is quite strong at a quite low sintering temperature, and the alloy silver powder is especially suitable for PERC solar cell slurry.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a preparation method of alloy silver powder, which is used for PERC solar cell conductive paste. Background technique [0002] At present, silver paste for PERC solar cells is mostly prepared with pure silver powder. The silver paste for solar cells prepared with pure silver powder has a high sintering temperature (900-930°C), which is easy to cause high-temperature damage to the solar cell and affect the conversion efficiency of the cell. Furthermore, when the solar cell welding electrode is in a large current path, the silver ion migration phenomenon will occur in the silver electrode, and the adhesion force of the solar cell electrode will gradually decrease with the prolongation of time, and finally an open circuit will be formed. Contents of the invention [0003] The purpose of the present invention is to provide a kind of silver alloy powder and its preparation metho...

AI Technical Summary

Problems solved by technology

[0002] Currently, PERC solar cell silver paste is mostly prepared with pure silver powder. The solar cell silver paste prepared with pure silver powder has a high sintering temperature (900-930°C), which is easy to cause high-temperature damage to the solar cell and affect the conversion efficiency of the cell.

Furthermore, when the solar cell welding electrode is in a large current path, silver ions will migrate in the silver electrode, and the adhesion of the solar cell electrode will gradually decrease with the extension of time, and finally an open circuit will be formed.

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