Patent ID: 6686620
Filing Date: 2004-02-03
Classification: H01L

Abstract:
A ferroelectric random access memory (FRAM) having a cell capacitor comprising:a bottom electrode having sidewalls defining a cylinder, and a lower wall meeting the sidewalls and closing an end of the cylinder; a ferroelectric film covering a surface of the bottom electrode, the ferroelectric film having: a liner part covering an inside surface of the sidewalls and lower wall of the bottom electrode that define the cylinder, and a flange part extending radially outward from the cylinder shape and over at least an edge of sidewalls of the bottom electrode; a first top electrode layer covering a surface of the ferroelectric film opposite the bottom electrode, a surface of the first top electrode layer that is opposite the ferroelectric film defining a hollow; a fill material filling the hollow; and a second top electrode layer covering a top surface of the fill material and covering a portion of the first top electrode layer over the flange part of the ferroelectric film.