Patent ID: 6225206
Filing Date: 2001-05-01
Classification: B23K,H01L,H05K,Y02P

Abstract:
A method for forming an electrical structure, comprising the steps of:providing a first structure, including a first substrate, a first conductive body mechanically and electrically coupled to the first substrate, and a coat of nonsolderable and nonconductive material, wherein a portion of a surface of the first conductive body is coated by the coat of nonsolderable and nonconductive material such that an uncoated surface of the first conductive body remains;providing a second structure, including a second substrate and a conductive bump mechanically and electrically coupled to the second substrate;placing the second structure in contact with the first structure such that the conductive bump is in contact with the uncoated surface of the first conductive body;reflowing the conductive bump without melting any portion of the first conductive body to form a second conductive body, wherein the second conductive body covers the uncoated surface of the first conductive body; andcooling the first structure and the second structure to solidify the second conductive body and to mechanically and electrically couple the second conductive body to the first conductive body by surface adhesion at the uncoated surface of the first conductive body.