Patent ID: 7592223
Filing Date: 2009-09-22
Classification: H01L

Abstract:
1. A method of making a non-volatile memory using a semiconductor substrate, the method comprising: forming a first layer of dielectric material over a surface of the substrate; forming a set of strips of charge storage material elongated in a first direction over the surface of the substrate with the first layer of dielectric material therebetween; forming a set of strips of one or more additional layers over the first set of strips of charge storage material; forming isolation trenches in the substrate elongated in the first direction between active areas of the substrate below the set of strips of charge storage material; forming a pattern over the set of strips of charge storage material for etching a set of charge storage structures from each set; covering a portion of the pattern with a cover; etching at least one of said one or more additional layers while covering the portion of the pattern; removing the cover from the portion of the pattern; etching the set of strips of charge storage material using the pattern to form the sets of charge storage structures, wherein the charge storage structures of a set include sidewalls elongated in the first direction with spaces between sidewalls of structures adjacent in the second direction; forming a second layer of dielectric material along the sidewalls of the set of charge storage structures; and forming a set of strips of conductive material elongated in the second direction and at least partially occupying the spaces between adjacent charge storage structures.