Patent ID: 8148215
Filing Date: 2012-04-03
Classification: H01L

Abstract:
1. A manufacturing method for a semiconductor device including a non-volatile memory, comprising the steps of: forming a semiconductor film on an insulating surface; forming a resist pattern over the semiconductor film; etching the semiconductor film to form a semiconductor island having tapered side edges by decreasing a selective ratio of the semiconductor film and the resist pattern; forming a first insulating film on the semiconductor island; forming a floating gate film over a channel forming region of the semiconductor island with the first insulating film interposed therebetween, the floating gate film covering the tapered side edges of the semiconductor island; forming a second insulating film over the floating gate film; and forming a control gate film over the floating gate film with the second insulating film interposed therebetween, the control gate film covering the tapered side edges of the semiconductor island.