Modified silver thick film sizing agent for crystalline silicon solar cell and preparation method thereof

Abstract

The invention discloses a modified silver thick film sizing agent for a crystalline silicon solar cell and a preparation method thereof. The modified silver thick film sizing agent comprises the following ingredients by weight percentage: conductive superfine silver powders accounting for 75 to 90 percent, glass powders accounting for 1 to 8 percent, and organic phases accounting for 9 to 17 percent; in addition, the modified silver thick film sizing agent also comprises surface active agents accounting for 0.05 to 2 percent of the total weight of the conductive superfine silver powders and the glass powders. According to the invention, the surfaces of the powders are coated with a layer of surface active agents, so that the aggregation condition of the powders can be improved, the powders can be dispersed in the organic phases better so as to form a more stable sizing agent system, at the same time, the scraper fineness of the sizing agent can be reduced, and the service life of the sizing agent can be prolonged. An electrode printed through the modified silver thick film sizing agent achieves great height, low body resistance and higher mechanical strength after being sintered. Therefore, not only the modified silver thick film sizing agent disclosed by the invention improves the mechanical strength of the electrode of the cell, but also fill factors (FF) of the cell are increased, the series resistance is reduced, the optical conversion efficiency is improved, and the cell can be enabled to achieve good balance of comprehensive electrical property and mechanical performance.

Description

technical field [0001] The invention relates to silver thick-film paste for crystalline silicon solar cells and a preparation method thereof. Background technique [0002] In the manufacturing process of crystalline silicon solar cells, it is necessary to make electrodes on the front and back surfaces of the cells to lead out the photo-generated current generated by the cells. A good ohmic contact needs to be formed between the electrode and the semiconductor. The methods for making electrodes include vacuum evaporation method, magnetron sputtering method, light-induced electroplating method and screen printing method. The cost of the screen printing method is low, which is beneficial to realize the industrialization and large-scale production of solar cells, and the screen printing method is generally used in the process. [0003] The screen printing method is used to prepare the electrodes of crystalline silicon solar cells. The screen printing technology is used to coat...

AI Technical Summary

Problems solved by technology

However, since these methods directly mix the solid phase used in the slurry with the high-viscosity organic phase, the solid powder has been agglomerated very seriously before grinding and ball milling

At the same time, the mechanical dispersion force produced by three-roll grinding and ball milling is limited, and the processing object is slurry with high solid content and high viscosity, which can only disperse larger aggregates, thus affecting the slurry scraper. Further reduction in fineness

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