Method of etching a TE/PCMO stack using an etch stop layer

1. A method of etching a top electrode/ferroelectric stack using an etch stop layer, comprising:

preparing a substrate;

forming a first layer of a first dielectric material on the substrate;

forming a bottom electrode in the first layer of the first dielectric material;

depositing an etch stop layer on the first layer of the first dielectric material and the bottom electrode, including forming a hole in the first layer of the etch stop layer exposing a portion of the bottom electrode;

depositing a layer of PCMO material on the etch stop layer and extending through the hole to the bottom electrode;

depositing top electrode material on the PCMO material to form a top electrode/PCMO stack;

stack etching the top electrode and PCMO material, stopping at the level of the etch stop layer;

depositing a layer of a second dielectric material on the etch stop layer and encapsulating the top electrode and PCMO material;

etching the layer of the second dielectric material to form a sidewall about the top electrode and PCMO material;

depositing a second layer of the first dielectric material;

smoothing the a second layer of the first dielectric material by CMP;

depositing a third layer of the first dielectric material;

etching contact holes through the layers of the first and second dielectric material to the bottom and top electrodes; and

metallizing the ferroelectric stack.

2. The method of claim 1 wherein the first dielectric material is taken from the group of dielectric materials consisting of SiO 2 , Si 3 N 4 , SiO X , TiO, ZrO 2 and TaO 2 .

3. The method of claim 1 wherein the second dielectric material is taken from the group of dielectric materials consisting of SiO 2 , TiO 2 , HfO 2 , ZrO 2 and TaO 2 .

4. The method of claim 1 wherein the etch stop layer is formed of a material taken from the group of materials consisting of SiO 2 , TiO 2 , HfO 2 , ZrO 2 , TaO 2 , titanium and TiN.