A kind of silicon solar cell electrode silver-coated copper paste and preparation method thereof

Abstract

The invention relates to a silicon solar cell electrode silver coated copper sizing agent and a preparing method of the silicon solar cell electrode silver coated copper sizing agent. Conductive component micro silver coated copper powder is the spherical micro metal powder with copper serving as the core, silver serving as the shell, and copper-tin-silver alloy serving as the middle layer, the copper content is 50 percent to 60 percent, the silver content is 30 percent to 40 percent, the tin content is 3 percent to 10 percent, the particle size is 1-3 microns, the tap density is 4.0-5.5 g / ml, the specific surface area is 0.5-1.5 m<2> / g, and the conductive component micro silver coated copper powder is prepared under the alkaline condition with glyoxylic acid or glyoxal serving as a reducing agent to conduct step-by-step reduction on copper sulfate, tin sulfate and a silver nitrate solution. A bismuth-silicon-boron-zinc-cerium-molybdenum system is adopted in lead-free glass powder, the softening temperature of the glass powder is 400-600 DEG C, the micro silver coated copper powder serves as the conductive component, a large amount of silver powder is saved, and the raw material cost of the conductive sizing agent is greatly reduced.

Description

technical field [0001] The invention relates to a silver-coated copper paste for a silicon solar cell electrode and a preparation method thereof, in particular to a silicon solar cell electrode with copper as the core, silver as the shell, and a spherical fine metal powder of copper-tin-silver alloy as the conductive component in the middle layer. A solar cell conductive paste and a preparation method thereof belong to the fields of new materials and solar cells. Background technique [0002] A solar cell is a semiconductor device that can convert solar energy into electrical energy. Under the condition of light, the solar cell will generate current, collect and transmit electricity through grid lines and electrodes. The industrial production of crystalline silicon cells consists of slicing p-type crystalline silicon materials, cleaning and chemical etching to make texture; phosphorus diffusion on the light-receiving surface to form a p-n junction; coating silicon nitride an...

AI Technical Summary

Problems solved by technology

[0008] In order to make the lead-free glass powder binder and silver powder mix more evenly, the particle size of the glass powder binder is generally controlled below 10μm, and the dosage is controlled at 0.5%-10% of the total weight of the conductive silver paste. If the dosage is less than 0. If the amount exceeds 10%, it will affect the etching of the anti-reflection film and the adhesion between the silicon substrate and the silver electrode; if the amount exceeds 10%, it will reduce the conductivity of the silver electrode

The invention does not provide the percentage of silver in the silver-coated copper powder, and it is impossible to determine the silver powder saving and cost reduction

[0017] In addition, the existing solar cell silver-clad copper paste has high sintering temperature and narrow sintering temperature range, large volume resistance, poor compactness of the silver layer wrapping, and there is a gap between the high temperature oxidation resistance and the traditional conductive silver paste, and the product cost is also low. relatively high