Patent ID: 9241403
Filing Date: 2016-01-19
CPC Classification: H01L,H05K

Claim Text:
1. A method for forming a first microelectronic device to be assembled with a second microelectronic device, the method comprising the steps of: forming, on the first microelectronic device comprising at least one conductive pad, said pad having a bottom surface resting on a substrate and an upper surface opposite said bottom surface, a conductive layer applied over said pad; forming a protective dielectric layer over said conductive layer, the protective dielectric layer comprising at least one first opening facing said pad and exposing said conductive layer; forming, on a peripheral region above the upper surface of said conductive pad, an insulating block, said insulating block being provided with a cross-section forming a closed contour and comprising a second opening located inside said insulating block and exposing at least part of the first opening in the protective dielectric layer; forming, in said at least one first opening and said second opening, a conductive pillar by growth from said conductive layer, the height of the conductive pillar and the height of said insulating block relative to each other being such that a void space or cavity is maintained between the top of said conductive pillar and a mouth region of said second opening lying on a level with the top of said insulating block, the protective dielectric layer being arranged outside said insulating block so that growth of said conductive pillar on said conductive layer is prevented outside said insulating block; and after said forming a conductive pillar, etching said protective dielectric layer and said conductor layer outside said closed contour of the insulating block using the insulating block and said conductive pillar as a protective mask for etching.