Patent ID: 6204530
Filing Date: 2001-03-20
Classification: H01L

Abstract:
A nonvolatile semiconductor memory device comprising:a semiconductor substrate of a first conductivity type having a surface region;a first diffusion region of a second conductivity type opposite to the first conductivity type, formed in said surface region to extend in a first direction;a plurality of channel regions in said surface region, separated from one another and extending from an edge of said first diffusion region in a second direction generally perpendicular to the first direction;a plurality of floating gate layers of conductive material, each floating gate layer formed over a first portion of a respective channel region on a first insulating layer and extending over a portion of said first diffusion region;a plurality of control gate layers of conductive material formed to extend over said floating gate layers and over second portions of said channel regions not covered by said floating gate layers, and separated from said floating gate layers by a second insulating layer and from said second portions by a third insulating layer; anda plurality of second diffusion layers of the second conductivity type, formed in said surface region between neighboring ones of said second portions of said channel regions.