Patent ID: 7635607

Claim:
A method for manufacturing an image sensor, comprising: forming an interlayer insulating layer on a substrate including a photodiode; forming a metal line and a metal pad in the interlayer insulating layer; forming a color filter layer and microlenses on the interlayer insulating layer including the metal line; selectively etching the interlayer insulating layer to form a pad opening exposing the metal pad; and depositing copper in the pad opening to form a copper bump, wherein depositing copper in the pad opening to form a copper bump comprises: forming a barrier metal layer and a copper seed layer on the substrate over the pad opening and the microlens; forming a photoresist pattern on the copper seed layer, the photoresist pattern exposing the pad opening; forming a copper plated layer in the pad opening; planarizing the copper plated layer; and removing the photoresist patterns.