Patent ID: 6060739
Filing Date: 2000-05-09
Classification: H01L

Abstract:
A non-volatile semiconductor memory device comprising:a semiconductor well region of a first conductivity type having a groove, said semiconductor well region having a bottom surface which defines a bottom of said groove, a first side surface which defines one side of said groove, and a second side surface which defines the other side of said groove, said groove having first, second and third areas, each extending between said first side surface and said second side surface, said third area of said groove being interposed between said first and second areas of said groove;a floating gate electrode formed in said third area of said groove, said floating gate electrode having a top surface, a bottom surface, a first side surface, and a second side surface;a first dielectric film intervening between said bottom surface of said semiconductor well region at said third area of said groove and said bottom surface of said floating gate electrode;a second dielectric film intervening between said first side surface of said semiconductor well region at said third area of said groove and said first side surface of said floating gate electrode;a third dielectric film intervening between said second side surface of said semiconductor well region at said third area of said groove and said second side surface of said floating gate electrode;a fourth dielectric film formed on said top surface of said floating gate electrode;a first diffusion region of a second conductivity type formed in said bottom, first and second side surfaces of said semiconductor well region at said first area of said groove;a second diffusion region of said second conductivity type formed in said bottom, first and second side surfaces of said semiconductor well region at said second area of said groove; anda control gate electrode formed on said fourth dielectric film,each of said bottom, first and second side surfaces of said semiconductor well region at said third area of said groove being served as a channel region.