Patent ID: 9558998
Date: 2017-01-31
CPC Classifications: H01L

Claim:
1. A method for fabricating an apparatus comprising one or more semiconductor devices, the method comprising: obtaining a substrate comprising one or more holes; forming a conductive layer over the substrate, the conductive layer extending into each said hole to provide in each said hole at least a part of an interconnect structure in the apparatus, a top surface of the conductive layer having a recess over each said hole, wherein over each said hole, the corresponding recess extends downward from an adjacent area of a top surface of the conductive layer, the adjacent area laterally surrounding a bottom of the recess; forming a sacrificial layer covering the conductive layer; and removing at least a portion of the sacrificial layer and a portion of the conductive layer to form a protrusion of the conductive layer at a location of each said recess over the corresponding hole, wherein over each said hole, the corresponding protrusion extends upward from an adjacent area of the top surface of the conductive layer, the adjacent area laterally surrounding a top of the protrusion.