Patent ID: 9159685
Filing Date: 2015-10-13
Classification: H01L

Abstract:
1. A method for forming a conductive structure comprising: forming a patterned insulating layer above a passivation layer of a semiconductor chip, wherein the semiconductor chip comprises a semiconductor substrate, a pad and the passivation layer, wherein the pad is disposed on the semiconductor substrate, the passivation layer is disposed on the semiconductor substrate partially covers the pad to expose the pad through a first opening that is formed by the passivation layer, and the patterned insulating layer is disposed on the passivation layer and partially covers the first opening to expose the pad through a second opening that is defined by the patterned insulating layer, wherein the first opening is larger than the second opening; forming an under bump metal (UBM) layer covering the patterned insulating layer and the second opening to electrically connect to the pad; and forming a conductive bump disposed in the second opening to electrically connect to the under bump metal layer, wherein the under bump metal layer covers a periphery of the conductive bump; and removing the under bump metal layer disposed in an external region layer outside the second opening of the patterned insulating layer, thereby a first upper surface of the under bump metal layer is flush with a second upper surface of the patterned insulating layer, a third upper surface of the conductive bump is higher than the first upper surface of the under bump metal layer, and the portion of the conductive bump disposed in the second opening is covered by the under bump metal layer.