Patent ID: 6440865
Filing Date: 2002-08-27
Classification: C23F,H01L

Abstract:
A method of profile control for etching a metal layer positioned on a dielectric layer, wherein the metal layer comprises at least:an aluminum-alloy layer on the dielectric layer; an anti-reflection layer on the aluminum-alloy layer; and wherein the method of profile control for etching a metal layer comprises the steps of: performing a breakthrough step of a first etch recipe to remove the anti-reflection layer and a certain thickness of the aluminum-alloy layer until a predetermined depth is reached, wherein the first etch recipe provides a first source power, a first bias power, and a nitrogen gas as a reactive gas, and wherein the ratio between the first source power and the first bias power is about 1/3; and performing a main etch step of a second etch recipe having a higher etch rate than the first etch recipe to remove the remaining residue of the aluminum-alloy layer, wherein the second etch recipe provides a second source power, a second bias power, and a nitrogen gas as a reactive gas, and wherein the ratio between the second source power and the second bias power is about 10/3.