Patent ID: 8901735
Filing Date: 2014-12-02
Classification: H01L

Abstract:
1. A device comprising: a polymer layer having a top surface; a copper-containing metal pillar comprising a portion over the top surface of the polymer layer; a first non-wetting layer on a sidewall of the copper-containing metal pillar, wherein the first non-wetting layer comprises a material selected from a group consisting essentially of a copper nitride, a copper oxide, and a copper oxynitride; a nickel-containing metal cap over the copper-containing metal pillar, wherein the nickel-containing metal cap comprises edge portions extending beyond respective sidewalls of the copper-containing metal pillar; a second non-wetting layer on a sidewall of the nickel-containing metal cap, wherein the second non-wetting layer comprises a material selected from a group consisting essentially of a nickel nitride, a nickel oxide, and a nickel oxynitride; and a solder region over the nickel-containing metal cap.