Patent ID: 6894341

Claim:
A semiconductor device, comprising: a semiconductor substrate; a plurality of first diffusion regions arranged apart from one another substantially in line on the semiconductor substrate; a plurality of memory cell gate electrodes insulatively formed on the semiconductor substrate between the first diffusion regions disposed adjacent to each other; a second diffusion region formed adjacent to and apart from an end of the plurality of first diffusion regions formed substantially in line on the semiconductor substrate; a selection gate electrode insulatively formed on the semiconductor substrate between the end of the first diffusion regions and the second diffusion region; a peripheral gate electrode insulatively formed on the semiconductor substrate apart from the plurality of memory cell gate electrodes and the selection gate electrode; a first insulation film filled between adjacent ones of the plurality of memory cell gate electrodes and between the end of the plurality of memory cell gate electrodes and the selection gate electrode, formed at a substantially uniform thickness on a side surface of the peripheral gate electrode, and including a main component other than nitrogen; and a second insulation film formed on at least the side surface of the peripheral gate electrode via the first insulation film and formed of a material different from that of the first insulation film, wherein hydrogen concentration in the first insulation film is smaller than that in the second insulation film.