Patent ID: 7902592

Claim:
A semiconductor device comprising: a bit line formed to extend into a semiconductor substrate; a charge storage layer formed on the semiconductor substrate; a word line formed above the charge storage layer and to extend across the bit line; a gate electrode formed on the charge storage layer under the word line and between bit lines; a first insulating film formed over the bit line to extend in the direction of the bit line; a second insulating film comprising a different material than that of the first insulating film and formed to adjoin a side surface of the first insulating film; an interlayer insulating film comprising a different material from that of the second insulating film and formed on the first insulating film and the second insulating film; and a contact plug coupled to the bit line and formed to penetrate through the first insulating film and the interlayer insulating film and to be sandwiched by the second insulating film.