Patent ID: 6277730
Filing Date: 2001-08-21
Classification: H01L

Abstract:
A method for fabricating a semiconductor device, comprising the steps of:forming lower-level metal interconnects over a semiconductor substrate;depositing a first silicon-rich insulating film containing a larger quantity of silicon than a quantity defined by stoichiometry so as to cover the lower-level metal interconnects with a recess being formed between each of the lower-level metal interconnects covered with the first silicon-rich insulating film;depositing a fluorine-containing insulating film being made of a fluorine-doped insulator on the first silicon-rich insulating film so as to fill the recess between each of the lower-level metal interconnects covered with the first silicon-rich insulating film;depositing a second silicon-rich insulating film containing a larger quantity of silicon than a quantity defined by stoichiometry;depositing a silicon-containing insulating film containing silicon in a quantity defined by stoichiometry over the second silicon-rich insulating film; andforming upper-level metal interconnects over the silicon-containing insulating film.