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Preparation of Highly Dispersed Spherical Silver Powders

Using hydroquinone and mono-ethanolamine as the dispersant and p H regulator, the high performance spherical silver powders were prepared by chemical reduction. The effects of monoethanolamine addition on the silver performance were studied. The results showed that the spherical silver powders of 1.49 μm in average particle size and 2.16 g/cm3 in bulk density were obtained under the conditions of the adding amount of mono-ethanolamine was 250% of silver nitrate amount. XRD, EDS, and SEM analyses indicated that the silver particles are spherical shape, they have high purity, low impurity content, high crystallinity and good dispersity. The electrode silver paste prepared by these silver powders was screen printed on the silicon wafer, the square resistance of it is 5.26 m?/□, it satisfies electric requirement of electrode silver paste for solar cells.