Photovoltaic cell applied silver paste and preparation method thereof

Abstract

The invention relates to photovoltaic cell applied silver paste and a preparation method thereof. The silver paste comprises the following components: 50-70% of conductive phase, 10-25% of glass frit, 10-25% of organic carrier and 1-3% of additive. The above proportions are in mass percent, wherein the conductive phase is a mixture of silver powder and tri-silver citrate. The additive is a mixture of TiO2 or KAuCl4 with any one the following elements: microcrystalline cellulose, sodium alginate and mannitol. The method comprises: (1) adding the mixture of the ethyl alcohol absolute and the ethylene glycol to the conductive phase and the glass frit; (2) taking the organic carrier to mix with the organic solvent and grinding it with a three-roll mill; (3) preparing a silver film through the screen printing technology; and (4) placing the printed silver film in a muffle furnace and calcining it at a temperature from 700-800 degrees for three to five seconds. The silver paste of invention has a good printing performance and a low contact resistance with the silicon wafer. After the sintering of the silver paste, the electrode has a narrow width and a high thickness and can achieve good compactness, reducing the use amount of silver paste greatly. The overall cost is also low.

Description

technical field [0001] The invention relates to a silver paste for a lead-free photovoltaic cell and a preparation method thereof, which has low sintering temperature and good printability. Background technique [0002] With the deepening of research and development of solar cells, solar cells have basically entered the stage of industrial application. At present, solar cell materials on the market are mainly silicon-based solar cells, including crystalline silicon, polycrystalline silicon and polycrystalline silicon thin-film solar cells, and silicon-based thin-film solar cells. The electrode made on the illuminated side of the battery is called the upper electrode, and the electrode made on the back of the battery is called the lower electrode or the back electrode. The upper electrode is the negative electrode, which is printed on the anti-reflection film with silver conductive paste through screen printing, and is sintered to form the electrode. The lower electrode is ...

AI Technical Summary

Problems solved by technology

[0010] Therefore, there is still a large gap between domestic silver conductive paste and imported silver paste in terms of conductivity and paste stability. How to produce silver paste with excellent performance under the premise of ensuring cost is still a problem

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