Patent ID: 8691705
Filing Date: 2014-04-08
Classification: C23F,H01L

Abstract:
1. A method of patterning a metal alloy material layer having hafnium and molybdenum, comprising: providing a substrate, a metal alloy material layer having hafnium and molybdenum already formed on the substrate; forming a patterned mask layer on the metal alloy material layer having hafnium and molybdenum, wherein the patterned mask layer comprises a photoresist layer and a hard mask layer is disposed below and contacts with the photoresist layer and is disposed on the metal alloy material layer having hafnium and molybdenum; etching the metal alloy material layer having hafnium and molybdenum using the patterned mask layer as a mask with an etchant to form a metal alloy layer having hafnium and molybdenum, wherein the etchant is consisted of 20-80 percent by weight of nitric acid, 1-49 percent by weight of hydrofluoric acid, 1-96 percent by weight of sulfuric acid and water, based on a total weight of nitric acid, hydrofluoric acid, sulfuric acid and water; and removing the patterned mask layer.