Patent ID: 7053448

Claim:
A silicon oxide nitride oxide semiconductor (SONOS) type memory device comprising: a semiconductor substrate; a first impurity region and a second impurity region in the semiconductor substrate, the first impurity region and the second impurity region doped with impurity ions of a predetermined conductivity and separated a predetermined distance from each other, wherein a channel region exists between the first impurity region and the second impurity region; and a data storage type stack formed on the semiconductor substrate between the first impurity region and the second impurity region, wherein the data storage type stack includes a tunneling oxide layer, a memory node layer for storing data, a blocking oxide layer, and an electrode layer, which are sequentially formed, a dielectric constant of the memory node layer is higher than a dielectric constant of the tunneling oxide layer and a dielectric constant of the blocking oxide layer, and a band offset of the memory node layer is lower than a band offset of the tunneling oxide layer and a band offset of the blocking oxide layer, the tunneling oxide layer and the blocking oxide layer are high dielectric insulating layers, the memory node layer is a MON layer or a MSiON layer, where M is a metal, and the tunneling oxide layer is a material having a higher dielectric constant than silicon oxide (SiO 2 ).