Patent ID: 8709889
Filing Date: 2014-04-29
Classification: G11C,H01L

Abstract:
1. A method for manufacturing a semiconductor device, the method comprising the steps of: forming a first conductive layer and a second conductive layer over a substrate; forming a first insulating film covering the first conductive layer and the second conductive layer; forming a third conductive layer between the first conductive layer and the second conductive layer with the first insulating film interposed between the third conductive layer and each of the first conductive layer and the second conductive layer; forming a second insulating film over covering the first insulating film and the third conductive layer; removing part of the first insulating film and part of the second insulating film so as to expose a top surface of the first conductive layer and a top surface of the second conductive layer, thereby forming a first insulating layer in contact with a side surface of the first conductive layer and a side surface of the second conductive layer and a second insulating layer between the first conductive layer and the second conductive layer with the first insulating layer interposed between the second insulating layer and each of the first conductive layer and the second conductive layer; forming a first semiconductor layer over the first conductive layer, the second conductive layer, and the second insulating layer, wherein the first semiconductor layer is an oxide semiconductor layer and electrically connected to the first conductive layer and the second conductive layer; forming a third insulating layer covering the first semiconductor layer; forming a fourth conductive layer over the third conductive layer with the second insulating layer, the first semiconductor layer, and the third insulating layer interposed therebetween; forming a fourth insulating layer covering the fourth conductive layer; and forming a fifth conductive layer over the second conductive layer and adjacent to a side surface of the fourth conductive layer with the fourth insulating layer interposed therebetween.