Patent ID: 8466507

Claim:
A semiconductor device including a plurality of non-volatile memory cells electrically connected to a word line extending in a first direction in plane view, comprising: a plurality of floating gates formed over a semiconductor substrate; a plurality of first insulating films formed between each of the said floating gates in the first direction, respectively; a second insulating film formed over a top surface of each of the first insulating films, side surfaces of each of the floating gates and a top surface of each of the floating gates; and a control gate configured to serve as a word line formed over the second insulating film, wherein a height of the top surface of each of the floating gates is higher than a height of the top surface of each of the first insulating films, wherein each of the first insulating films is formed in self-alignment with a corresponding one of the floating gates, wherein a length of each the of the floating gates in a second direction, perpendicular to the first direction, is larger than a length of each of the floating gates in the first direction, and wherein a length from a top surface of the second insulating film which is formed over the first insulating films to the top surface of the floating gates is larger than a length of the space between each of the floating gates in the first direction, and larger than the length of each of the floating gates in the first direction.