Solar cell electrode slurry, preparation method, cell electrode and solar cell

Abstract

The invention discloses one kind of solar cell electrode slurry comprising an organic carrier and silver powder, glass powder and an antifoaming agent which are dispersed in the organic carrier. The silver powder comprises micrometer silver particles, nanometer silver particles and silver nano wires which are 2-8 [mu]m in length and 100-200 nm in diameter, and silver nano wires account for 50-80% of the total mass of the silver powder. According to the invention, the silver powder mostly is prepared by the silver nano wires which are stable in preparation process and lower in cost relative to nanometer silver particles, so that the material cost of the electrode slurry is effectively lowered; in addition, gaps of the silver power can be filled by silver nano wires, micrometer silver particles and nanometer silver particles, so that conductive paths are added and a conductive network is formed, and the volume resistivity of the electrode material is lowered. At the same time, the invention further discloses a preparation method of the electrode slurry, and a cell electrode and a solar cell using the electrode slurry.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a solar battery electrode paste, a preparation method, a battery electrode and a solar battery. Background technique [0002] Solar cell conductive silver paste is mainly composed of silver powder (conductive phase or conductive filler), glass powder (bonding phase), organic vehicle and other additives (auxiliary materials) in a certain proportion. Silver powder is used as a conductive phase in silver paste, and its average particle size, content, and dispersibility all have a great influence on the performance of silver paste. First, the average particle size of the silver powder will affect the printing and sintering properties of the silver paste, thereby affecting the electrical performance of the solar cell. Studies have shown that if the average particle size of silver powder is large, it will block the screen during screen printing, so that the paste cannot leak through the scree...

AI Technical Summary

Problems solved by technology

However, in the process of preparing silver-coated copper powder with core-shell structure by liquid-phase chemical reduction method, raw copper powder, silver nitrate concentration, complexing agent, reducing agent, reaction temperature, stirring speed, pH value and additives (such as dispersant , protective agent) and other factors will affect the properties of the solution in the coating process, the surface activity of the core and the deposition rate of silver particles, thereby affecting the quality of the silver coating layer and the performance characteristics of the silver-coated copper powder

Therefore, the current preparation process of silver-coated copper powder with core-shell structure is complicated, and there are problems such as easy hydrolysis at the beginning of coating, insufficient stability and reliability of coating effect, and low utilization rate of silver salt.

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