Patent ID: 7132358
Filing Date: 2006-11-07
Classification: H01L,Y10S

Abstract:
1. A method of forming a solder bump, the method comprising: forming a first photoresist pattern on a wafer having a pad, the first photoresist pattern having an opening that exposes a portion of the pad; forming a first under bump metallurgy (UBM) layer on the pad; forming a second UBM layer on the first photoresist pattern, the second UBM layer being spaced apart from the first UBM layer; forming a second photoresist pattern that exposes the first UBM layer and covers the second UBM layer; forming a solder bump in the opening; and removing the second photoresist pattern and the first photoresist pattern using a stripper, thereby removing the second UBM layer by a lift-off method.