Method of manufacturing flip-chip mounted solder bump for semiconductor device and solder bump manufactured thereby

摘要

Silver-tin alloy solder bumps are fabricated by forming a masked underbump metallurgy layer on a microelectronic substrate, to define exposed portions of the underbump metallurgy layer, plating silver on the exposed portions of the underbump metallurgy, plating tin on the silver and reflowing to form silver-tin alloy solder bumps. Accordingly, silver-tin alloy is not plated. Rather, individual layers of silver and tin are plated, and then reflowed to form silver-tin alloy solder bumps.