Patent ID: 9349665
Filing Date: 2016-05-24
CPC Classification: H01L

Claim Text:
1. A device, comprising: a substrate; a metal layer on the substrate; a passivation layer above the metal layer with a passivation layer opening formed therein exposing the metal layer, the passivation layer opening having sidewalls; a dielectric layer above the passivation layer and the metal layer, the dielectric layer extending into the passivation layer opening and along the sidewalls, wherein the dielectric layer has a first opening exposing the metal layer and a ring-opening structure surrounding the first opening, the ring-opening structure comprising a second opening, a bottom surface of the second opening being a dielectric surface, a first area of the dielectric layer being between the first opening and the second opening, and a second area of the dielectric layer being outside the ring-opening structure; an under-bump metallization (UBM) pad disposed at least partially in the first opening of the dielectric layer in contact with the metal layer, extending above the first area of the dielectric layer, and the UBM disposed in the second opening of the dielectric layer and in contact with the passivation layer, the UBM pad not contacting a sidewall of the second opening that is laterally distal to the first opening, the UBM pad not completely filling the second opening; and a solder connector on the UBM pad, the solder connector not extending into the second opening.