Patent ID: 7989958

Claim:
A chip comprising a first chip with a first electrical contact, wherein the first electrical contact comprises at least two layers, wherein one of the at least two layers comprises one of a first metal or a first alloy and another one of the at least two layers comprises one of a second metal or a second alloy different from the first metal or the first alloy, wherein the first electrical contact has a proximal end and a distal end with respect to the first chip, wherein the distal end has a shape projected in a plane parallel to the first chip, wherein the projected shape is configured to facilitate penetration into a second electrical contact of a second chip and a mechanical and electrical connection between the first electrical contact and the second electrical contact of the second chip when the first and second electrical contacts are joined at a temperature below a melting point of the second electrical contact, and wherein at least a portion of the second electrical contact is malleable and is configured to deform when the first and second electrical contacts are joined at the temperature below a melting point of the malleable portion.