Patent ID: 9449843
Filing Date: 2016-09-20
CPC Classification: C23F,H01L

Claim Text:
1. A method of etching a metal layer, the method comprising: placing a patterned substrate into a substrate processing region of a substrate processing chamber, wherein the patterned substrate comprises an exposed portion of the metal layer, wherein the metal layer comprises a first metal element; and flowing an oxygen-containing precursor into the substrate processing region; oxidizing the exposed portion of the metal layer, wherein oxidizing the exposed portion forms an oxidized portion of the metal layer and leaves behind an unoxidized portion of the metal layer; and flowing a metal-and-halogen-containing precursor into the substrate processing region; selectively etching the oxidized portion of the metal layer, wherein the metal-and-halogen-containing precursor comprises a second metal element and a halogen.