Patent ID: 7560764

Claim:
A SONOS memory device comprising: a semiconductor substrate having an active region and a field region; a gate formed over the active region; a multi-dielectric layer formed between the active region and the gate, wherein the multi-dielectric layer is comprised of a first oxide layer, a nitride layer and a second oxide layer from the active region; and a source region and a drain region formed in the active region under both sides of the gate respectively, wherein the upper surface of the active region is a curved surface, wherein the multi-dielectric layers also have a curved shape according to the upper surface of the active region, wherein the gate wraps the second oxide layer having the curved shape, and wherein the radius of curvature of the second oxide layer is larger than that of the upper surface of the active region to make a difference between F-N currents at the first oxide layer and at the second oxide layer.