Patent ID: 8642458
Filing Date: 2014-02-04
Classification: H01L

Abstract:
1. A method of fabricating a nonvolatile memory device, comprising: providing a structure including a floating gate on a semiconductor substrate, an isolation film adjacent to the floating gate on the semiconductor substrate and having an upper surface at least a portion of which is located at a level beneath the level of the upper surface of the floating gate, and a gate insulating film extending over a side wall of the floating gate and across the upper surface of the isolation film, the structure having a recess defined therein above a portion of the gate insulating film that extends across the upper surface of the isolation film; forming a conductive layer on the gate insulating film, wherein the forming of the conductive layer comprises conformally forming a lower conductive film on the gate insulating film such that the lower conductive film conforms to the topography of the underlying structure, and forming an upper conductive film on the at least one lower conductive film; and annealing the conductive layer, wherein the annealing comprises annealing the lower conductive film to such an extent that part of the conductive film flows from the level of an upper portion of the floating gate down to the level of a lower portion of the floating gate over the portion of the gate insulating film that extends across the upper surface of the isolation film.