Patent ID: 9190376
Filing Date: 2015-11-17
Classification: H01L

Abstract:
1. A method comprising: forming a pillar on an underlying layer, the underlying layer comprising a liner formed on a substrate and a conductive layer on the liner, wherein the liner extends beyond a width of the pillar structure and the conductive layer comprises a sidewall that is substantially flush with the sidewall of the pillar; forming a plate on an upper surface of the pillar; forming a solder layer only on an upper surface of the plate; forming an organic layer on the underlying layer surrounding the pillar, such that a sidewall of the pillar and not an upper surface or bottom surface of the pillar is in direct contact with the organic layer; annealing the pillar and the organic layer, such that an organic material in the organic layer and a metal in the pillar react to form a non-wettable organo-metallic layer along the sidewall of the pillar; and removing the organic layer, such that the non-wettable organo-metallic layer remains on the sidewall of the pillar; removing a portion of the liner after removing the organic layer, such that a remaining portion of the liner has a sidewall that is substantially flush with an outer sidewall of the organo-metallic layer.