Patent ID: 6242107
Filing Date: 2001-06-05
Classification: C23F,H01L,Y10T

Abstract:
A method for etching selected portions of an aluminum-containing layer of a layer stack, said layer stack being disposed on a substrate, said aluminum-containing layer being disposed below a photoresist mask having a pattern thereon, comprising:providing a plasma processing chamber;positioning said substrate having thereon said layer stack, including said aluminum containing layer and said photoresist mask, within said plasma processing chamber;flowing an etchant source gas that comprises HCl, a chlorine-containing source gas, and an oxygen-containing source gas into said plasma processing chamber, a flow rate of said oxygen-containing source gas being less than about 20 percent of a total flow rate of said etchant source gas;striking a plasma out of said etchant source gas, wherein said plasma is employed to etch at least partially through said aluminum-containing layer.