Patent ID: 9704822
Date: 2017-07-11
CPC Classifications: H01L

Claim:
1. A method, comprising: forming a first alignment structure on a first substrate, wherein the first alignment structure comprises an alignment trench formed in a bonding surface of the first substrate; forming a second alignment structure on a bonding surface of a second substrate, wherein the second alignment structure comprises a bonding pad with solder formed on the bonding pad; placing the bonding surfaces of the first and second substrates together with at least a portion of the solder of the second alignment structure in contact with at least a portion of the first alignment structure; and performing a solder reflow process to cause the solder on the bonding pad to melt and flow into the alignment trench while pulling on the bonding pad to cause the second substrate to move into alignment with the first substrate in each of X, Y, and Z directions; wherein the second alignment structure further comprises one or more standoff pads formed on the bonding surface of the second substrate, wherein alignment in the Z direction comprises contacting the one or more standoff pads to the bonding surface of the first substrate; and wherein the one or more standoff pads and the bonding pad on the bonding surface of the second substrate have substantially equal thicknesses.