Patent ID: 7935597

Claim:
A method of manufacturing a semiconductor device including: a semiconductor substrate; a first gate electrode and a second gate electrode which are formed over an upper portion of the semiconductor substrate and are adjacent to each other; a first gate dielectric film formed between the first gate electrode and the semiconductor substrate; a second layer formed between the second gate electrode and the semiconductor substrate and including a charge storage portion; a first channel region formed over the semiconductor substrate and positioned under the first gate electrode and the first gate dielectric film; and a second channel region formed over the semiconductor substrate and positioned under the second gate electrode and the second layer, the method comprising the steps of: (a) preparing the semiconductor substrate; (b) introducing impurities of a first conducting type into regions of the semiconductor substrate supposed to be the first channel region and the second channel region; (c) forming a first dielectric film for forming the first gate dielectric film over the semiconductor substrate from a silicon oxide film or a silicon oxynitride film; (d) depositing a metal-element-containing layer composed of metal oxide or metal silicate over the first dielectric film; (e) forming a silicon film for forming the first gate electrode over the first dielectric film deposited with the metal-element-containing layer; (f) forming the first gate electrode by patterning the silicon film; and (g) after the step (f), introducing impurities of a second conducting type reverse to the first conducting type into a region of the semiconductor substrate supposed to be the second channel region.