Patent ID: 6998325
Filing Date: 2006-02-14
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device comprising: applying an insulating-film composition containing an insulating-film precursor and a pore-generating material onto a surface of a semiconductor substrate; performing a first heat treatment of said insulating-film composition to polymerize said insulating-film precursor, without vaporizing said pore-generating material, to form a non-porous insulating film; forming a resist pattern on said non-porous insulating film; etching said non-porous insulating film using said resist pattern as a mask to form a trench in said non-porous insulating film; removing said resist pattern by ashing; cleaning the surface of said semiconductor substrate after the ashing; performing a second heat treatment of said non-porous insulating film after the cleaning, thereby removing said pore-generating material from said non-porous insulating film and forming a porous insulating film; forming a barrier-metal film on an inner surface of said trench; and filling said trench with a copper layer contacting said barrier-metal film.