High-viscosity solar cell front side silver paste and method for producing the same

Abstract

The invention relates to a high viscosity solar cell front silver serum and a preparation method thereof. The composition and the weight ratio of the high viscosity solar cell front silver serum are that conductive silver powder accounts for 75-85 percent, glass glue accounts for 2-10 percent, organic carrier accounts for 5.5-20 percent, the particle size of the conductive silver powder is 0.2-2mum; the composition and the weight ratio of the glass glue are that Bi2O3 accounts for 65-85 percent, SiO2 accounts for 5-20 percent, PbO accounts for 1-15 percent and Al2O3 accounts for 1-5 percent. After such processes are carried out by the serum as screen printing, low temperature drying and high temperature sintering, the aspect ratio of a conducting electrode formed on the surface of solar cell is high, the solar cell produced by using the method has small front shading area and high photoelectric conversion efficiency.

Description

Technical field: [0001] The invention relates to a raw material for producing a conductive electrode of a solar cell, in particular to a front silver paste of a solar cell and a preparation method thereof. Background technique: [0002] A solar cell is a semiconductor device that can convert solar energy into electrical energy. Under the condition of light, a photogenerated current will be generated inside the solar cell, and the electrical energy can be directly output through the electrodes. [0003] In order to extract the photo-generated current generated by the solar cell, positive and negative electrodes must be made on the surface of the solar cell. Commonly used electrode manufacturing processes include magnetron sputtering, vacuum evaporation and screen printing sintering, etc., but the production costs of magnetron sputtering and vacuum evaporation methods are too high and the economy is poor. At present, lead-containing solar cell conductive silver paste is widel...

AI Technical Summary

Problems solved by technology

However, the viscosity of this kind of system is small at present, the fluidity of the slurry is good, and the grid line collapses on the surface of the silicon wafer after printing, which increases the shading area of ​​the solar cell surface, reduces the light-receiving area of ​​the solar cell surface, and reduces the solar energy per unit area. Photoelectric conversion efficiency of the battery

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