High-performance spherical ultrafine silver powder for solar cell electric conduction silver paste and preparation method thereof

Abstract

The invention discloses high-performance spherical ultrafine silver powder for solar cell electric conduction silver paste and a preparation method thereof. The method comprises the following steps: (1) silver nitrate is dissolved in distilled water for uniform stirring; and a dispersing agent and a pH value adjusting agent are added; (2) hydroquinone is dissolved in the distilled water to obtainhydroquinone solution; and under the stirring condition, the obtained hydroquinone solution is quickly added in silver nitrate solution for reaction; and (3) after the reaction is finished, the staticsettlement and the suction filtration are performed; anhydrous ethanol is used for repeated washing and precipitation; and finally, the silver powder is obtained by drying. The invention further provides the high-performance spherical ultrafine silver powder for the solar cell electric conduction silver paste, which is prepared by the method. The sigh-performance spherical ultrafine silver powderfor the solar cell electric conduction silver paste and the preparation method thereof are easy to control the process conditions; and the performances of the prepared silver powder with high densityand easy dispersibility meet the production requirements of the solar cell electric conduction silver paste.

Description

technical field [0001] The invention relates to an ultrafine silver powder in the field of new energy and new materials and a preparation method thereof, in particular to a high-performance spherical ultrafine silver powder for solar cell conductive silver paste and a preparation method thereof. Background technique [0002] Silver powder is an important part of the positive electrode paste of solar cells. Only the conductive paste prepared with silver powder that meets specific conditions can have good screen printing performance. After sintering, the front silver electrode with high square resistance and fine grid lines can be formed. . The front electrode is divided into a grid electrode line and a main electrode line. The grid line mainly collects carriers generated by photoelectric conversion, and the main electrode mainly connects the battery sheet to the external circuit. The width of the positive grid line is about 0.15mm, the sintering temperature reaches 930°C, an...

AI Technical Summary

Problems solved by technology

[0009] There are still many deficiencies in the existing silver powder preparation technology: (1) reducing agent hydrazine hydrate, formaldehyde and hydroquinone are toxic and highly irritating, and the problems of environmental protection and safety are difficult to solve; (2) the cost of sodium borohydride and hydroquinone reducing agent is too high (3) The reducing agent ascorbic acid is sensitive to changes in system acidity, concentration and temperature, and the production conditions are not easy to control; (4) Commonly used reducing agents are too strong, and usually need to be used in conjunction with a large number of dispersants. Difficulty in subsequent silver powder separation