Patent ID: 8629490
Filing Date: 2014-01-14
Classification: G11C,H01L

Abstract:
1. A nonvolatile semiconductor storage device comprising: a semiconductor layer including a channel formation region, a first region, and a second region; a first insulating film over the semiconductor layer; a floating gate electrode over the first insulating film; a second insulating film over and in direct contact with the floating gate electrode; a control gate electrode over and in direct contact with the second insulating film; a first conductive layer over the first region and a second conductive layer over the second region; a third insulating film over the second insulating film, the control gate electrode, the first conductive layer, and the second conductive layer; and at least one electrode over the third insulating film and contacting one of the first conductive layer and the second conductive layer through a contact hole of the third insulating film, wherein the first conductive layer comprises a same conductive layer as the control gate electrode, wherein the second conductive layer comprises the same conductive layer as the control gate electrode, wherein at least one of the first conductive layer and the second conductive layer is in contact with the first insulating film and the second insulating film, and wherein the floating gate electrode comprises a semiconductor material of which resistivity is lower than that of the semiconductor layer.