Patent ID: 8288226
Filing Date: 2012-10-16
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device comprising: forming, in semiconductor substrate, a device isolation insulating film defining a device region; forming a first insulating film above the device region; forming, above the first insulating film, a first conductive film having a first width in a first direction; forming a second insulating film above the first conductive film; forming, above the second insulating film, a control gate extended in the first direction; etching the second insulating film and the first conductive film with the control gate as the mask to form a floating gate of the first conductive film below the control gate; forming a third insulating film above the semiconductor substrate with the control gate and the floating gate formed; forming, in the third insulating film, a first contact hole reaching the device region and having a second width in the first direction; and forming a fourth insulating film on a inside wall of the first contact hole.