Patent ID: 8546213

Claim:
A method of manufacturing a semiconductor device configured by forming a diode having a first electrode and a second electrode different from the first electrode as terminals over a semiconductor substrate, the method comprising: (a) providing the semiconductor substrate of a first conduction type; (b) forming a low concentration diffusion region of a second conduction type which is a conduction type opposite to the first conduction type over the semiconductor substrate; (c) forming a gate oxide film over a surface of the low concentration diffusion region overriding a PN junction formed by contact between the first conduction type and the second conduction type; (d) forming a gate electrode above the gate oxide film; (e) forming a first high concentration diffusion region of the first conduction type having an impurity concentration higher than that of the semiconductor substrate; (f) forming a second high concentration diffusion region of the second conduction type having an impurity concentration higher than that of the low concentration diffusion region; (g) forming a first electrode so as to be connected electrically with the first high concentration diffusion region; and (h) forming a second electrode so as to be connected electrically with the gate electrode and the second high concentration diffusion region.