Patent ID: 7652321

Claim:
A semiconductor device comprising: a memory portion comprising a first transistor and a second transistor, the first transistor comprising: a first active layer; a first gate insulating film over the first active layer; a floating gate electrode over the first gate insulating film; a second gate insulating film over the floating gate electrode; and a control gate electrode over the second gate insulating film; the second transistor comprising: a second active layer; a third gate insulating film over the second active layer; a fourth gate insulating film on and in contact with the third gate insulating film; and a gate electrode over the fourth gate insulating film; a pixel portion comprising a third transistor over a substrate having an insulating surface; a driver circuit portion comprising a fourth transistor over the substrate; and a connecting portion including an electrode pad capable of electrically connecting the memory portion to one of the pixel portion and the driver circuit portion, wherein the resistivity of the material of the control gate electrode is lower than the resistivity of the material of the floating gate electrode, wherein the memory portion is stuck to the substrate, wherein the third gate insulating film and the first gate insulating film are made from a same insulating material, and wherein the fourth gate insulating film and the second gate insulating film are made from a same insulating material.