Patent ID: 6696356
Filing Date: 2004-02-24
Classification: H01L

Abstract:
A method of making a bump on a semiconductor device comprising:providing a semiconductor device having a contact pad and having an upper passivation layer and an opening formed in the passivation layer exposing a portion of the contact pad; depositing an under bump metallurgy over the upper passivation layer and the contact pad; depositing a photoresist layer over the under bump metallurgy, and wherein the photoresist layer comprises a sheet of dry film photoresist; selectively patterning the photoresist layer to provide an opening in the photoresist layer down to the under bump metallurgy and aligned with the contact pad; thereafter applying additional energy to the photoresist layer to improve the adhesion of the photoresist layer to the under bump metallurgy thereby preventing the formation of ribbon residue from forming between the photoresist layer and the under bump metallurgy upon any subsequent depositing of electrically conductive material into the opening in the photoresist layer: depositing an electrically conductive material into the opening formed in the photoresist layer and overlying the under bump metallurgy and aligned with the contact pad; removing the remaining portion of the photoresist layer; and reflowing the electrically conductive material to provide a bump on the semiconductor device.