Conductive silver paste applied to preparation process of solar cell

Abstract

A conductive silver paste used in the preparation process of solar cells, comprising an organic carrier, a conductive material, a glass medium and a silver precursor, the conductive material, the glass medium and the silver precursor are respectively dispersed in the organic In the carrier, the weight percentage of the silver precursor in the conductive silver paste is between 0.01wt.% and 10wt.% and is selected from silver monoxide, silver oxide, silver nitrate, silver iodide, silver bromide, chlorine The group consisting of silver chloride and silver fluoride. Through the matching of the silver precursor, the organic carrier, the conductive material and the glass medium and the adjustment of the weight percentage, the shrinkage rate during electrode formation can be adjusted, the diffusion of the conductive silver paste can be avoided, and the preparation process is improved. Rate.

Description

technical field [0001] The invention relates to a chemical material used in solar cells, in particular to a conductive silver paste used in the preparation process of solar cells. Background technique [0002] The basic structure of a traditional solar cell is to form a solar cell substrate by joining a p-type semiconductor and an n-type semiconductor, and a p-n junction (p-n junction) will be formed between the p-type semiconductor and the n-type semiconductor. When sunlight is irradiated, the solar cell will generate an electron-hole pair (hole-electron pair) at the p-n junction. Since the p-type semiconductor has a higher hole density; and the n-type semiconductor has a higher electron density, so at the p-n junction, the electrons of the electron-hole pair will go to the n-type semiconductor Move, and the holes of the electron-hole pair will move to the p-type semiconductor, and then generate current, and finally use the conductive electrode to collect the current for u...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the known conductive paste used for solar cells is prone to stress failure or linear expansion after sintering due to its thermal expansion coefficient mismatch with the substrate

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