Tin-doped silver-wrapped base metal slurry of back electrode of solar cell, and preparation method of slurry

Abstract

The invention discloses tin-doped silver-wrapped base metal slurry of a back electrode of a solar cell, and a preparation method of the tin-doped silver-wrapped base metal slurry. The tin-doped silver-wrapped base metal slurry comprises an adhesive, silver-containing powder and a diluent, wherein the silver-containing powder is formed by mixing silver powder, tin powder, silver-wrapped base metal powder and glass powder; and the silver-wrapped base metal powder refers to at least one of silver-wrapped nickel powder and silver-wrapped copper powder. By replacing part of pure silver powder by the silver-wrapped base metal powder, the problem of oxidation of pure base metal slurry in a sintering process of a cell piece can be solved, and the problems of high price and easiness in displacement of the pure silver powder can be solved; and furthermore, the tin powder is added into the slurry, so that the weldability and the adhesive force of the slurry are improved. Therefore, the tin-doped silver-wrapped base metal slurry is low in cost, adopts the simple preparation method, is suitable for industrial production, and has the advantages of low contact resistance, high cell conversion efficiency and high weldability and adhesive force.

Description

technical field [0001] The invention belongs to the field of solar cell paste, and in particular relates to a solar cell back electrode paste which uses silver-coated base metal powder to replace part of pure silver powder and adds tin powder and a preparation method thereof. Background technique [0002] With the rapid development of the information industry, electronic paste plays an important role as its key material. Therefore, high-performance and low-cost raw materials will greatly improve the competitiveness of electronic products, and will inevitably become an inevitable condition for the development of the electronic paste industry itself. At present, the main component of the silver paste on the front and back of solar cells is metallic silver, which belongs to the series of precious metals. Therefore, silver paste is one of the most expensive raw materials in the process of preparing solar cells except silicon wafers. The cost of raw materials is reduced. The ind...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides a silver-coated base metal paste doped with tin on the back electrode of a solar cell and a preparation method thereof. The preparation method of the present invention is simple, and uses silver-coated base metal powder to replace part of the pure silver powder, solving the problem of It solves the oxidation problem of pure base metal paste in the cell sintering process, and solves the problem of high price and easy migration of pure silver powder, and the added tin powder improves the solderability and adhesion of the paste, so the cost of the present invention is Low, suitable for industrial production, the prepared slurry has low contact resistance, high battery conversion efficiency, good weldability and adhesion

Images