Patent ID: 6365959
Filing Date: 2002-04-02
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor substrate; lower-level metal interconnects placed over the semiconductor substrate; a first silicon-rich insulating film which contains a larger quantity of silicon than a quantity defined by stoichiometry and covers the lower-level metal interconnects such that a recess covered with the first silicon-rich insulating film is formed between the lower-level metal interconnects; a fluorine-containing insulating film on the first silicon-rich insulating film, the fluorine-containing insulating film being made of a fluorine-doped insulator and filling the recess between the lower-level metal interconnects covered with the first-silicon rich insulating film; a second silicon-rich insulating film on the fluorine-containing insulating film, which contains a larger quantity of silicon than a quantity defined by stoichiometry; a silicon-containing insulating film over the second silicon-rich insulating film, the silicon-containing insulating film containing silicon in a quantity defined by stoichiometry; and upper-level metal interconnects over the silicon-containing insulating film.