Patent ID: 8803285

Claim:
A semiconductor device having a capacitive structure formed by layering a lower electrode, a capacitive insulation film, and an upper electrode in order on a wiring or conductive plug, the semiconductor device comprising, as the capacitive structure, a thin-film capacitor having a lower electrode structure comprising: a polycrystalline film; and an amorphous or microcrystalline film formed on the polycrystalline film or a laminate of amorphous and microcrystalline films formed on the polycrystalline film, wherein the upper electrode is smaller in dimension than the lower electrode structure in the thin-film capacitor, wherein the semiconductor device further comprises a first hard mask film which covers only the upper electrode, a second hard mask film which covers the first hard mask film and side surfaces of the upper electrode and the first hard mask film, and the capacitive insulation film has a capacitance per unit area between 3 fF/μm 2 and 25 fF/μm 2 .