PERC crystalline silicon solar back silver paste and preparation method thereof

The invention relates to the technical field of H01B1/16, in particular to PERC crystalline silicon solar back silver paste and a preparation method thereof.The PERC crystalline silicon solar back silver paste is composed of a silver powder paste combination, mixed metal oxide paste and inorganic additive paste, the silver powder paste combination comprises silver powder paste with D50 being 50 nm to 1 mu m, and by optimizing the formula of the back silver paste, the mixed metal oxide paste can be mixed with the inorganic additive paste; the silver content of the back electrode silver paste for the PERC crystalline silicon solar cell is effectively reduced to 48-52% (weight percentage), and the photoelectric conversion efficiency and the welding performance of the cell are ensured while the material cost of the cell is reduced. 本发明涉及H01B1/16技术领域，具体为一种PERC晶硅太阳能背面银浆及其制备方法，由银粉浆料组合、混合金属氧化物浆料和无机助剂浆料组成，所述银粉浆料组合包括D50为50nm-1μm的银粉浆料，通过优化背面银浆配方，有效降低PERC晶硅太阳能电池用背面电极银浆的银含量至48～52％(重量百分比)，降低电池片的材料成本的同时保证电池片的光电转换效率和焊接性能。