Patent ID: 6716699
Filing Date: 2004-04-06
Classification: H01L

Abstract:
A method for manufacturing a flash memory device, comprising:(a) sequentially forming a first gate insulating film, a first gate conductive film, and a second insulating film on a semiconductor substrate; (b) defining a region for a first gate by partially etching the second insulating film to expose an upper portion of the first gate conductive film; (c) forming second conductive film spacers along sidewalls of the etched second insulating film; (d) forming an oxide film on the exposed surface of the second conductive film spacers and the first gate conductive film; (e) forming silicon insulating film spacers on sidewalls of the etched second insulating film; (f) forming a source junction contact hole by etching the first gate conductive film and the first gate insulating film, using the second insulating film and the silicon insulating film spacers as a mask; (g) forming a source junction contact fill by filling the source junction contact hole with a conductive film; (h) forming the first gate by sequentially removing the second insulating film and the first gate conductive film beneath the second insulating film; (i) forming a second gate insulating film on an exposed sidewall of the first gate; (j) sequentially forming a second gate conductive film and a silicon nitride film on the semiconductor substrate and exposing upper portions of the source junction contact fill and the second gate conductive film by removing the silicon nitride film so that it is level with an upper portion of the silicon insulating film spacers; (k) forming a mask silicon oxide film over the exposed source junction contact fill and the second gate conductive film; and (l) forming a second gate by sequentially removing the exposed silicon nitride film and the second gate conductive film under the silicon nitride film.