Patent ID: 6296780
Filing Date: 2001-10-02
Classification: H01L

Abstract:
A process for etching a multi-layer coating from a base of a substrate, the process comprising:(a) placing a substrate into a process zone;(b) introducing into the process zone a first etchant gas comprising at least one of a carbon-fluoride-hydrogen gas, a carbon-fluoride gas, and a carbon-chlorine-fluorine-containing gas, said first etchant gas in combination with a chlorine-containing gas;(c) forming a plasma from the etchant gas for etching at least one of the combinations of, (1) an organic anti-reflective coating layer and a titanium nitride anti-reflective coating layer, and (2) multiple titanium comprising layers and an anti-reflective coating comprising titanium, located on the substrate;(d) introducing into the process zone a second etchant gas comprising boron-chlorine gas and chlorine gas; and(e) forming a plasma from the second etchant gas to thereby eliminate notching of the titanium nitride anti-reflective coating and organic anti-reflective coating layers on the substrate.