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Thermal-sprayed nanostructured silver particles for interconnect applications

Taking the advantage of high specific surface area, fine silver particles were recently attract much attention since they can be sintered as conductive circuits or joints at relatively low processing temperatures. Although various methods have been applied to produce silver particles, the spray pyrolysis (SP) process has an advantage in its low cost and feasibility for mass production. In this study, silver acetate with a decomposition temperature of 280°C was used as precursors to synthesize Ag fine particles. Experimental results show that there exists a critical temperature for the full conversion of silver acetate to submicron Ag powders. The amount of residual precursors affects the electrical conductivity of the sintered structures and the shear strength of the joints bonded with pastes consisting of thermal-sprayed particles.