Patent ID: 6105852
Filing Date: 2000-08-22
Classification: H01L,H05K

Abstract:
The method of forming bump contacts for fusion to contact pads on an integrated circuit, comprising the steps of:providing an approximately flat, chemical etchant responsive, transparent, bump contact carrier member,depositing a resistant coating for said chemical etchant on a surface of said carrier member,patterning at least one opening defining area in photoresist on said coating,etching, with a coating removal etchant, the portion of said coating located in said opening defining area, producing thereby a hole through said coating that exposes in said hole said surface of said carrier,etching, with said chemical etchant, said carrier member through said hole until a hemispherical cavity is produced in said carrier, said cavity having a diameter at said surface of said carrier that extends under said coating and is larger than said hole, and,injecting solder into and filling said cavity through said hole.