Method of forming raised metallic contacts on electrical circuits for permanent bonding

摘要

A method is provided for forming at least one raised metallic contact on an electrical circuit for permanent bonding. Generally, this method includes the following steps: providing a composite base substrate which is defined by at least a first conductive layer, a dielectric material and a second conductive layer; removing a portion of the first conductive layer to expose the dielectric material; removing the exposed portion of the dielectric material to the second conductive layer, thereby forming a depression; depositing at least one layer of solder on at least side wall portions of the depression; depositing at least one layer of copper; removing the second conductive layer; and completely removing the dielectric material to said first conductive layer thereby forming a raised solder contact which extends perpendicularly away from the first conductive layer.