Patent ID: 6756269
Filing Date: 2004-06-29
Classification: H01L

Abstract:
A method of manufacturing a nonvolatile semiconductor memory comprising:providing a silicon substrate; depositing a gate oxide film on the silicon substrate; depositing a first poly-silicon layer on the gate oxide film; patterning the first poly-silicon layer and the gate oxide film to divide the first poly-silicon layer and the gate oxide film into memory elements and to expose silicon substrate portions which are boundaries of the memory elements; forming a second poly-silicon layer on the silicon substrate portions and on the first poly-silicon layer, the second poly-silicon layer having an impurity therein; forming a first impurity diffusing region by diffusing the impurity from the second poly-silicon layer into the silicon substrate portions, by a heat-treatment; depositing an intermediate insulating film on the second poly-silicon layer; depositing a silicide layer over the intermediate insulating film; etching the first and second poly-silicon layers, the intermediate insulating film and the silicide layer to form a control gate and a floating gate; forming a second impurity diffusing region, which includes source and drain regions of a memory element, in the silicon substrate; and connecting the second impurity diffusing region with the first impurity diffusing region.