Patent ID: 7371588

Claim:
A method of manufacturing a semiconductor device comprising: forming a circuit element on a semiconductor substrate; forming a first insulation film on said semiconductor substrate, said first insulation film covering said circuit element; forming a first electrode on said first insulation film; forming a ferroelectric film on said first electrode; forming a second electrode on said ferroelectric film; forming a mask film on said second electrode, said mask film having a predetermined pattern; etching said second electrode with said semiconductor substrate or a mounting electrode being set to a first temperature within a range of 350° C. to 450° C. using a first mixed gas including Cl 2 and at least O 2 at gas flow rates of 5/15 sccm and using said mask film as a mask, said semiconductor substrate being mounted on said mounting electrode; etching said ferroelectric film with said semiconductor substrate or said mounting electrode being set to a second temperature within a range of 25° C. to 350° C. using a second mixed gas including Cl 2 and at least Ar at gas flow rates of 10/10 sccm and using said mask film as the mask, said second temperature being lower than said first temperature and the second mixed gas does not include a fluorine gas; and etching said first electrode with said semiconductor substrate or said mounting electrode being set to a third temperature within a range of 350° C. to 450° C. using a third mixed gas including Cl 2 and at least O 2 at gas flow rates of 5/15 sccm and using said mask film as the mask, said third temperature being approximately the same as said first temperature.