Patent ID: 8148258
Filing Date: 2012-04-03
Classification: H01L,H05K

Abstract:
1. Method for fabricating electrical bonding pads on electrical contact areas of a wafer, comprising: depositing a first layer made of a screen material; producing first openings in this first layer over at least some of the electrical contact areas; producing first blocks made of a solder material in the first openings; depositing a second layer made of a screen material on the first layer and the first blocks; producing second openings in this second layer, placed above at least some of the first blocks, a section of each second opening being smaller than a section of the upper face of the underlying block; producing second blocks made of a solder material in the second openings; removing the material of the first and second layers; and heating so as to shape each of the combined first and second blocks into a domed electrical bonding pad; wherein producing the second opening comprises producing at least two second openings over and in contact with an upper surface of each underlying first block.