Patent ID: 9685372
Date: 2017-06-20
CPC Classifications: C23C,C25D,H01L

Claim:
1. A method of forming an integrated circuit device, the method comprising: forming a conductive element over a substrate, wherein the conductive element is over an under bump metallurgy (UBM) layer, and the UBM layer comprises a first UBM layer and a second UBM layer over the first UBM layer; etching the second UBM layer to expose a portion of the first UBM layer beyond a periphery of the conductive element; forming a protection layer over sidewalls of the conductive element, over sidewalls of the second UBM layer and directly contacting a top surface of the first UBM layer; etching the first UBM layer to remove a portion of the first UBM layer, wherein etching first UBM layer comprises removing the protection layer from an upper portion of the sidewalls of the conductive element; and forming a cap layer over a top surface of the conductive element.