Patent ID: 7598138

Claim:
A semiconductor device manufacturing method comprising: forming an impurity diffusion region in a semiconductor substrate by ion-implanting an impurity into a capacitor formation region of the semiconductor substrate under a condition that a beam current is equal to or more than 1 μA but less than 3 mA; forming a capacitor dielectric film on and in contact with the impurity diffusion region of the semiconductor substrate by thermally oxidizing a surface of the semiconductor substrate in the impurity diffusion region to form a thermal oxidation film which serves as the capacitor dielectric film; and forming a capacitor upper electrode on the capacitor dielectric film, wherein, when forming the capacitor dielectric film, a gate insulating film formed of the same insulating film as that forming the capacitor dielectric film is formed on a transistor formation region of the semiconductor substrate, and wherein, when forming the capacitor upper electrode, a gate electrode formed of the same conductive film as that forming the capacitor upper electrode is formed on the gate insulating film.