Patent ID: 7192831
Filing Date: 2007-03-20
Classification: H01L

Abstract:
1. A method for manufacturing a nonvolatile semiconductor memory device comprising: forming a first stacked structure including at least a gate insulator and a first conductive material layer on a semiconductor substrate; forming trenches corresponding to a pattern of element isolation regions from the first stacked structure into the semiconductor substrate; forming an insulating material in the trenches; forming a second stacked structure including at least an inter-gate insulator and a second conductive material layer on the exposed surfaces of the insulating material and the first stacked structure; forming a plurality of stacked gate structures including at least the first conductive material layer, a second gate insulator, and the second conductive material layer by patterning the first stacked structure and the second stacked structure; forming an interlayer insulator between the stacked gate structures; forming trenches corresponding to the pattern of the stacked gate structures at the interlayer insulator by partially removing the stacked gate structure; and forming a third conductive material layer in the trenches.