Patent ID: 6509261
Filing Date: 2003-01-21
Classification: G03F,H01L,Y10S,Y10T

Abstract:
A wiring forming method comprising the steps of:forming a wiring material layer from a polycide on an insulation film covering one of major surfaces of a substrate; forming a first antireflection coating film made of Ti(O)N on said wiring material layer; stacking a second antireflection coating film made of an organic material directly on said first antireflection coating film; coating a resist layer on a lamination film which includes said first and second antireflection coating films, and exposing said resist layer to light in accordance with predetermined wiring patterns; forming resist patterns by developing said resist layer which has been exposed to light; selectively removing said second antireflection coating film by anisotropic dry etching which uses said resist patterns as masks, in order to leave patterns of said second antireflection coating film which correspond to said resist patterns; selectively removing said first antireflection coating film by anisotropic dry etching which uses said resist patterns and the patterns of said second antireflection coating films as masks, in order to leave patterns of said first antireflection coating film which correspond to said resist patterns; selectively removing said wiring material layer by anisotropic dry etching with an etchant containing 02, which uses said resist patterns, the patterns of said second antireflection coating film and the patterns of said first antireflection coating film as masks, in order to leave patterns of said wiring material layer which correspond to said resist patterns; and removing at least said resist patterns and the patterns of said second antireflection coating film, and leaving the patterns of said wiring layer as wiring layers.