Patent ID: 8318597

Claim:
A manufacturing method of a semiconductor device, said method comprising: forming a seed film on a semiconductor chip; forming a photoresist having an opening above an electrode of the semiconductor chip on the seed film, such that in a plan view, edges of the opening coincide with edges of the electrode; forming a barrier film on an upper surface of the electrode, said barrier film extending from an edge of the semiconductor device to another edge of the semiconductor device; forming a first Au bump on the seed film in the opening by electrolytic plating with a current density of 1.5 A/dm 2 or above; grinding a surface of the first Au bump; stripping the photoresist; and removing the seed film by dry-etching, wherein said barrier film extends with a flat profile and parallel to the upper surface of the electrode from the edge of the semiconductor device to the another edge of the semiconductor device.