Patent ID: 7179738
Filing Date: 2007-02-20
Classification: H01L,H05K,Y10S

Abstract:
1. A method for fabricating an apparatus comprising the steps of: providing a substrate of insulating material having first and second surfaces, said substrate having a plurality of metal-filled vias extending from said first to said second surface; depositing on said first and second substrate surfaces a continuous layer of seed metal capable of providing an adhesive and conductive layer for electroplating on its surface; depositing, exposing, and developing a photoresist layer on said seed metal layer on said first and second substrate surfaces, forming windows to selectively expose portions of said seed metal; electrolytically plating a layer of a first support metal over said exposed portions of said seed metal; electrolytically plating a layer of a second support metal on said exposed portions of said first support metal, said first and second support metals having a purity of at least 99.0%; electrolytically plating at least one sacrificial metal layer over said exposed portions of said second support metal, said sacrificial metal having a purity of at least 99.0%; removing the remaining photoresist layer; and removing the exposed seed metal layer, isolating said plated support metals and sacrificial metals to form islands.