Patent ID: 6649965
Filing Date: 2003-11-18
Classification: H01L

Abstract:
A semiconductor device comprising:a first semiconductor film constituting a lower portion of a floating gate formed on a device forming region of a semiconductor substrate via a tunnel insulating film; device isolation recesses formed in the first semiconductor film, substrate, adjacent to the device forming region; a device isolation insulating film buried in the device isolation recesses, and having a planarized upper surface a second semiconductor film formed on the first semiconductor film as an upper portion of the floating gate and having an extended portion on the planarized upper surface of the device isolation insulating film, where the extended portion extending in a lateral direction such that a film thickness is thinned continuously from the device forming region to the device isolation insulating film; a dielectric film formed on the second semiconductor film; and a control gate formed on the floating gate via the dielectric film.