Patent ID: 6518096
Filing Date: 2003-02-11
Classification: H01L,H05K

Abstract:
A fluxless method for forming an interconnect assembly comprising:providing a first semiconductor substrate having a first pad connected thereto, a post connected to the first pad and having a length greater than a thickness of the first pad, a metallic solder disposed on an end of the post; providing a second semiconductor substrate having a second pad connected thereto; depositing an unfilled polymeric liquid on the second pad; aligning and contacting the metallic solder with the unfilled polymeric liquid; and forcing by pressure the first and second semiconductor substrates toward each while simultaneously heating the metallic solder and the unfilled polymeric liquid to form a metallurgical joint between the second pad and the metallic solder, wherein said heating the metallic solder and the unfilled polymeric liquid comprises increasing the temperature of the metallic solder until the temperature of the metallic solder is greater than its melting temperature; and subsequently decreasing the temperature of the metallic solder and the unfilled polymeric liquid until the temperature is around the curing temperature of the unfilled polymeric liquid.