Leadless solar battery silver paste and method for producing the same

Abstract

The invention discloses lead-free solar cell silver serum and a preparation method thereof, which consists of 70-85 percent of conducting silver powder, 5-10 percent of lead-free glass glue and 5.5-25 percent of organic carrier, wherein, the organic carrier consists of organic solvent and organic additive, the organic solvent is any kind of terpineol, terebinth and ethers or their combination; the organic additive is any kind of ethyl cellulose, dibutyl phthalate and acrylic resin or their combination; the particle size of the conducting silver powder is 0.2-2mum; and the lead-free glass glue belongs to bismuth-silicon- antimony glass system. The solar cell silver serum obtained by the method in the invention is lead-free, which complies with requirements of environmental protection, and a conducting electrode with strong adhesive force and low ohm contact resistance can be formed on the surface of the solar cell. The cell has high photoelectric conversion efficiency and is an ideal substituent of the lead silver serum.

Description

Technical field: [0001] The invention relates to a raw material for producing conductive electrodes of solar cells, in particular to lead-free solar cell silver paste 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 widely use...

AI Technical Summary

Problems solved by technology

At present, the glass binder used in the conductive silver paste of solar cells is a bismuth-silicon-lead glass mixed powder. Although this glass powder has the advantages of low softening temperature and stable electrical properties, the system contains a relatively high proportion of lead. , the pollution to the environment is relatively large, and it does not meet the requirements of environmental protection

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