Patent ID: 8551857

Claim:
A method for manufacturing a semiconductor device having an electrostatic capacitor with a MIM structure including a lower electrode, a capacitance insulating film and an upper electrode formed on a semiconductor substrate, wherein a step of forming the electrostatic capacitor includes: (a) a step of patterning a first metal film formed on a first interlayer insulating film on the semiconductor substrate, thereby forming the lower electrode; (b) a step of forming a second interlayer insulating film on the first interlayer insulating film and the lower electrode; (c) a step of forming an opening part in a part of the second interlayer insulating film, thereby causing a surface of the lower electrode to be exposed from a bottom surface of the opening part; (d) a step of forming the capacitance insulating film so as to cover an upper part of the second interlayer insulating film and a side wall and the bottom surface of the opening part; (e) a step of sequentially forming a second metal film and a protective metal film on the capacitance insulating film, thereby filling the opening part with the protective metal film; (f) a step of polishing and removing the protective metal film and the second metal film on the second interlayer insulating film by a chemical mechanical polishing method, thereby causing the capacitance insulating film, the upper electrode made of the second metal film and the protective metal film to remain in the opening part and causing the capacitance insulating film to remain on the second interlayer insulating film; and (g) a step of forming a third interlayer insulating film on the second interlayer insulating film.