Patent ID: 8536047
Filing Date: 2013-09-17
Classification: H01L

Abstract:
1. A method of realizing electrical contact between a first conducting material on a first substrate and a second conducting material on a second substrate, the method comprising: (a) receiving a first intermetallic layer on the first conducting material on the first substrate, wherein the first intermetallic layer is brittle and has a roughness such that it breaks upon contacting a solder material with a low pressure, wherein excess metal on the first intermetallic layer is removed; (b) receiving a solder material on the second conducting material, wherein the solder material has a lower melting point than the first and second conducting materials and the first intermetallic layer, wherein the solder material is softer than the first intermetallic layer; (c) bringing the solder material in contact with the first intermetallic layer at a temperature below the melting temperature of the solder material such that the first intermetallic layer breaks; (d) bringing the solder material in closer contact with the first intermetallic layer at a temperature below the melting temperature of the solder material such that the solder material fills at least part of the holes in the surface of the first intermetallic layer after breaking the first intermetallic layer; and (e) forming a second intermetallic layer at the interface between the solder material and the first intermetallic layer at a temperature below the melting temperature of the solder material.