Patent ID: 7875546
Filing Date: 2011-01-25
Classification: H01L

Abstract:
1. A method for preventing metal corrosion on a bond pad of an integrated circuit device, the method comprising the steps of: applying an anti-reflective coating layer to a metal stack of the bond pad; etching a portion of the anti-reflective coating layer to form an anti-reflective coating layer aperture through the anti-reflective coating layer down to the metal stack, the anti-reflective coating layer aperture having an upper edge, a lower edge, and a sidewall surface extending between the upper edge and the lower edge, the sidewall surface formed during formation of the anti-reflective coating layer aperture; depositing a passivation layer over the anti-reflective coating layer to seal the sidewall surface of the anti-reflective coating layer aperture from an ambient atmosphere; and etching an opening through the passivation layer down to the metal stack, wherein the etching leaves portions of the passivation layer that cover (i) the sidewall surface of the anti-reflective coating layer aperture, (ii) a top surface of the anti-reflective coating layer, and (iii) outer sidewall surfaces of the anti-reflective coating layer and the metal stack.