Patent ID: 7575972
Filing Date: 2009-08-18
Classification: H01L

Abstract:
1. A method of manufacturing a nonvolatile memory device, comprising the steps of: (a) forming a tunnel oxide layer, a first conductive layer for a floating gate, and a hard mask layer over a semiconductor substrate; (b) etching a portion of the hard mask layer, the first conductive layer, the tunnel oxide layer and the semiconductor substrate, thereby forming trenches; (c) gap-filling the trenches with an insulating material to form isolation layers; (d) removing the hard mask layer, thereby forming a projected portion of the isolation layers; (e) forming a second conductive layer for a floating gate on the surface resulting from step (d); (f) forming spacers on vertical faces of the second conductive layer; (g) removing a portion of the second conductive layer on the isolation layers and between the spacers by means of an etch process using the spacers as etch masks; (h) removing the spacers; and, (i) forming a dielectric layer and a third conductive layer on the surface resulting from step (h), including the second conductive layer.