Patent ID: 7884009
Filing Date: 2011-02-08
Classification: B23K,H01L,H05K

Abstract:
1. A method for fabricating a stacked semiconductor device, comprising the steps of: fabricating a first semiconductor device including the steps of: fabricating a second semiconductor device including the steps of: selecting solder bodies as substantially uniform alloys of: attaching and reflowing a solder body to each pad on the second semiconductor device to create a layer of intermetallic compounds between each copper pad and solder body, the compounds including grains of copper and tin compounds and copper, silver, and tin compounds; the compounds containing the at least one transition metal; aligning the second device with the first device so that each solder body is in contact with the corresponding first plurality pad of the first device; reflowing the solder bodies; attaching a alloy solder body to each second plurality pad of the first device; and reflowing the solder bodies.