Method of fabricating interconnects utilizing fluorine doped insulators and barrier layers

摘要

A plurality of lower-level metal interconnects are formed over a semiconductor substrate. A first fluorine-containing insulating film, made of a fluorine-doped insulator, is formed to fill in gaps between adjacent ones of the lower-level metal interconnects over the semiconductor substrate. An interlevel insulating film is formed over the lower-level metal interconnects and the first fluorine-containing insulating film. And a plurality of upper-level metal interconnects are formed on the interlevel insulating film. The interlevel insulating film includes: a second fluorine-containing insulating film made of a fluorine-doped insulator; and a silicon-rich insulating film containing a larger quantity of silicon than a quantity defined by stoichiometry.