Patent ID: 6232238
Filing Date: 2001-05-15
Classification: H01L

Abstract:
A method for preventing corrosion of a bonding pad on a surface of a semiconductor wafer, the bonding pad being a metallic layer formed on the surface of the semiconductor wafer, the semiconductor wafer comprising a passivation layer positioned above the bonding pad, and a dielectric layer positioned above the passivation layer, the passivation and dielectric layers comprising a hole etched to the bonding pad, the method comprising:using an organic solution to clean off residual polymers on the surface of the bonding pad inside the hole to prevent corrosion of the bonding pad, wherein the organic solution is an alkaline developer comprising 2.38% tetramethyl ammonium hydroxide (TMAH) for removing the residual polymers, and the residual polymers left on the surface of the bonding pad inside the hole comprise CF material.