Patent ID: 7183154
Filing Date: 2007-02-27
Classification: H01L

Abstract:
1. A method of fabricating a memory device having nonvolatile memory cells comprising: forming an active region at a predetermined region of a semiconductor substrate; selectively etching a portion of the active region to form a cell trench region, the cell trench region including a first sidewall, a second sidewall and a bottom surface; forming a first insulated floating gate and a second insulated floating gate on the first and second sidewalls, the first and second insulated floating gates being spaced apart from each other; forming a source region at the bottom surface of the cell trench region; forming a sidewall insulation layer on sidewalls of the first and second insulated floating gates; forming a source line in the cell trench region between and in contact with the first and second insulated floating gates; forming a first insulated word line and a second insulated word line overlapping the active region in areas of the active region adjacent to the first and second insulated floating gates, respectively; and forming a first drain region and a second drain region in the active region and adjacent to the first and second insulated word lines, respectively.