Patent ID: 7901997
Filing Date: 2011-03-08
Classification: H01L,H05K,Y02P

Abstract:
1. A method of manufacturing a semiconductor device including a semiconductor chip having a plurality of electrode pads and a wiring board having a connecting pad formed thereon which is opposed to the electrode pads, a metal bump formed of a first metal provided on the electrode pads being bonded to a solder provided on the connecting pad, to flip-chip connect the semiconductor chip to the wiring board, the method comprising: a solder forming step of forming the solder of a second metal different from the first metal on a connecting surface of the connecting pad which is opposed to the metal bump and a side surface of the connecting pad by a plating method, the formed solder on the connecting surface of the connecting pad and the side surface of the connecting pad having a first thickness, an accumulated solder forming step of melting the formed solder to provide accumulated solder on the connecting surface of the connecting pad, said accumulated solder being formed by a plating method and including the formed solder from the side surface of the connecting pad which moves to the connecting surface of the connecting pad by surface tension, said accumulated solder having a convex shape and a second thickness greater than the first thickness on the connecting surface of the connecting pad, and after forming the accumulated solder, a bonding step of moving the metal bump toward and into engagement with the connecting surface and with the accumulated solder, said accumulated solder bonding with the metal bump and coming into contact with the bump, the connecting pad, and b