Patent ID: 7315060

Claim:
A semiconductor storage device comprising: a semiconductor layer; a gate insulation film formed on the semiconductor layer a single gate electrode, wherein said single gate electrode is formed on the gate insulation film as a word line; a memory function body that is formed on both sides of the gate electrode and has a function to retain electric charge; a first conductivity-type channel region formed in a surface portion of the semiconductor layer on a side of the gate electrode; a second conductivity-type diffusion region formed on both sides of the channel region; a first conductivity-type first region formed in the channel region in a vicinity of an interface between the channel region and the memory function body; and a first conductivity-type second region formed in the channel region in a vicinity of an interface between the channel region and the gate insulation film, wherein a concentration of a dopant which imparts the first conductivity type to the first region is effectively lower than a concentration of a dopant which imparts the first conductivity type to the second region.