Patent ID: 6133155
Filing Date: 2000-10-17
Classification: G03F,H01L

Abstract:
A method for preventing corrosion of an aluminum-containing metallic layer having a plurality of trenches on the surface of a semiconductor chip caused by chlorine atoms resided on side walls of the trenches of the metallic layer after a trench etching process, the method comprising the following steps:eliminating a photo resistance layer on the top of the metallic layer at high temperature by an ashing process with a mixed gas which contains chlorine (Cl.sub.2), boron trichloride (BCl.sub.3), nitrogen (N.sub.2), and argon (Ar) so as to completely dissipate the chlorine atoms residue on the side walls of the metallic layer; andusing an organic solution to wash off residues left on the surface of the semiconductor chip.