Patent ID: 6054391
Filing Date: 2000-04-25
Classification: H01L

Abstract:
A method for etching a platinum layer of a semiconductor device, comprising the steps of:(a) forming a platinum layer;(b) forming a Ti containing mask layer on the platinum layer;(c) forming a photoresist pattern on the mask layer;(d) etching the mask layer using the photoresist pattern as a mask to form a mask pattern, wherein the mask layer is plasma-etched using Ar/Cl.sub.2, Cl.sub.2 /BCl.sub.3 or Cl.sub.2 /HBr gas;(e) etching the platinum layer using the photoresist pattern and the mask pattern as a mask to form a platinum pattern, wherein the platinum layer is plasma-etched using Ar, Ar/Cl.sub.2 or Ar/HBr gas;(f) removing the photoresist pattern;(g) removing a platinum etching by-product formed on the sidewalls of the photoresist pattern and the mask pattern during formation of the platinum pattern by plasma-etching using Cl.sub.2 /O.sub.2 or HBr/O.sub.2 gas, wherein both Cl.sub.2 /O.sub.2 and HBr/O.sub.2 gas consist of 40-95% O.sub.2 gas in volume; and(h) removing the mask pattern.