Crystalline silicon solar cell front silver paste and preparation method thereof

Abstract

The invention discloses a crystalline silicon solar cell front silver paste and a preparation method thereof. The front silver paste comprises the following components in percentage by weight: 85-90%of silver powder, 5-10% of an organic carrier, 5-10% of an organic carrier, 1.5-5% of composite glass powder, and 0.05-1% of a silver paste additive. The silver powder in different particle size distribution is cooperatively used, the slurry is good in ink permeability, and the silver powder particles in the grid line are more uniformly and tightly filled, so that the sintering density of the gridline is facilitated, the resistance of the grid lines is reduced, and the photoelectric conversion efficiency is improved. The preparation process of the glass powder is simple, the control is facilitated; the glass powder with different components is compounded and used, so that a series of particles are uniform, the softening temperature is low, and the composite glass powder has good wettability to the silver powder and the silicon substrate, a front silver paste prepared from the composite glass powder is sintered on the front surface of the cell, the silver electrode and the silicon havegood ohmic contact and welding performance, and the adhesion strength of the electrode is high.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to a front silver paste of a crystalline silicon solar cell and a preparation method thereof. Background technique [0002] As a new type of clean energy, solar energy has become an important way for human beings to obtain energy needs in the long-term development of the 21st century. Therefore, in recent years, it has received more and more attention and production. A solar cell is a device that converts light energy into electrical energy through the photoelectric effect. Radiation of a suitable wavelength incident on the P-N junction of a semiconductor acts as an external energy source for the generation of hole-electron pairs in the semiconductor. Due to the potential difference at the P-N junction, holes and electrons move across the junction in opposite directions. The electrons move to the negative contact, and the holes move to the positive contact, thereby generating ...

AI Technical Summary

Problems solved by technology

At present, the front electrode silver paste used for non-network printing in China is basically imported, and the domestic silver paste for non-network printing is partially printed with poor aspect ratio, which fails to reflect the advantages of high short-circuit current without network knots. Increase the height and width of printed grid lines by increasing the thixotropic dose and increasing the viscosity, but the stability of continuous printing is poor, false printing often occurs, and there are problems of poor storage and transportation stability

[0004] Nano-silver powder is generally used as the conductive phase for the front paste of crystalline silicon solar cells. Nano-silver powder has the advantage of being easy to sinter, but the structure of the sintered film of nano-silver powder is loose and has a large number of pores, which affects the conductivity of the grid line.

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