Silver conductor slurry for back electrodes of solar energy battery

Abstract

The invention discloses silver conductor slurry for back electrodes of a solar energy battery. The slurry is composed of, by weight, 50% to 65% of silver powder, 10% to 30% of glass powder, and 20% to 40% of organic carriers, wherein the glass powder is composed of, by weight, 50% to 70% of Bi2O3, 5% to 20% of SiO2, 5% to 10% of ZnO, 5% to 10% of TiO2, 5% to 15% of B2O3, and 1% to 5% of Al2O3. According to the silver conductor slurry for back electrodes of the solar energy battery, metal-oxide frits without lead oxide are used as binders so that the slurry is environment-friendly and is good for import and export; spherical silver powders with high tap density and bright silver powders with high conductivity are collocated according to a certain proportion, a compact network with excellent conductivity is formed after sintering and each of the back electrodes has an attractive appearance; the surface active agent and/ or antifoaming agent in the organic carrier can reduce foams in the silver slurry so that the printed pattern is compact, foam-free and airhole-free.

Description

technical field [0001] The invention relates to the technical field of electronic materials, in particular to a silver conductor paste for solar cell back electrodes. Background technique [0002] Solar photovoltaic power generation technology, as the most significant technology in the utilization of solar energy, has become a hotspot in the research and application of countries all over the world. Conductive silver paste is an important material for solar cell electrodes. It is specially used on the silicon wafers of solar cells by screen printing, covering on the silicon glass substrate, and forms conductive electrodes with strong adhesion and low ohmic contact resistance on the surface of solar cells. The photoelectric conversion efficiency of the battery is high. [0003] The silver conductor paste for the back electrode is an important raw material for the back electrode of the solar cell, and it is also used to cover the back of the silicon wafer by screen printing. ...

AI Technical Summary

Problems solved by technology

CN200910197917.4 discloses a low-temperature solderable conductive silver paste on the back of crystalline silicon solar cells, including silver powder, polymer resin, curing agent, and solvent. The polymer resin is epoxy resin, and the curing agent includes imidazole, isocyanate, acid anhydride or melamine , the curing agent in the silver paste further improves the softening point of the product, and has strong solder resistance, but the literature does not describe the appearance of the electrode after sintering and the electrical conversion efficiency, and the silver powder particles are a single component, which will lead to The network is not dense, and there are tiny pores on the surface of the conductive layer, which affects the photoelectric conversion efficiency

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