A kind of conductive paste and its preparation method and application

Abstract

The invention discloses electrocondution slurry and a preparation method and application of the electrocondution slurry. The slurry comprises, by mass percent, 30-40% of silver-graphene composite materials, 30-48% of organic resin, 5-10% of cross-linking agents and 12-26% of thinning agents. The method that the silver-graphene composite materials are prepared are as follows: graphite oxide and organic silver are added to a mixed system formed by organic solvents and deionized water, and ultrasonic dispersion is carried out on the mixture; hydrazine hydrate is dripped to the mixed system while the mixed system is stirred; after stirring is carried out for 20-30 min at room temperature, the temperature rises to 60-70 DEG C, reaction is conducted for 2-3 h, the mixture is cooled to be at the room temperature, filtered and rinsed by the deionized water, vacuum drying is carried out on the mixture, and the silver-graphene composite materials are obtained. The electrocondution slurry can meet the demands of photovoltaic devices for the electrical property under low silver content conditions and is suitable for flexible substrates, good in temperature and moisture resistance and excellent in filament printing performance, adhesive force of the electrocondution slurry and substrate ITO materials is high, and production cost of the slurry is remarkably reduced.

Description

technical field [0001] The invention belongs to the technical field of photoelectric information material preparation, and more specifically relates to a conductive paste and its preparation method and application. Background technique [0002] With the rapid increase in the price of fossil fuel energy, solar energy, as an abundant and clean renewable energy, is of great significance to the development and utilization of solar energy to alleviate the energy crisis, protect the ecological environment and ensure sustainable economic development. Although crystalline silicon solar cells occupy the main share of the solar cell market, thin-film solar cells have broad market prospects and great development potential due to their low cost, flexibility and bendability, simple manufacturing process and low carbon emissions, and have become the current solar cell development trend. [0003] In order to ensure the optical transmittance and electron collection efficiency of the device...

AI Technical Summary

Problems solved by technology

In the traditional silver paste preparation process, in order to effectively disperse and stabilize silver powder, surfactants and dispersants need to be used. Although there are many types of surfactants and dispersants, for electronic pastes, since they do not participate in electrical conduction, It will damage the electrical performance and stability of the electrode in the use of the device

In order to obtain stable electrical conduction performance, the metal silver paste currently used in thin-film solar cells has a high solid content, and the flexibility of the silver grid electrode is poor after the silver paste is cured. In actual production, the silver grid electrode is usually printed by screen printing. After high-speed printing of paste, the graphics are easy to collapse, which greatly reduces the effective light transmission area of ​​thin-film solar cells, and seriously affects the actual photoelectric conversion efficiency of solar cells.

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