Patent ID: 9129957
Filing Date: 2015-09-08
Classification: H01L

Abstract:
1. A method for forming a metal bump, which has the metal bump formed on an IC chip, the IC chip including a protection layer and a metal pad exposed from the protection layer, and the method comprising the steps of: (a) forming a photo-resist layer on the IC chip by using a lithographic process, wherein the photo-resist layer comprises a metal bump reserved groove and a metal bump slit reserved portion, extent of the metal bump reserved groove covers the metal pad, and the metal bump slit reserved portion is formed on the metal pad and within the metal bump reserved groove; (b) applying a deposition process to form the metal bump in the metal bump reserved groove and have the metal bump slit reserved portion penetrating the metal bump; and (c) removing the photo-resist layer to leave the metal bump with a metal bump slit therein.