Patent ID: 9111944
Filing Date: 2015-08-18
Classification: H01L

Abstract:
1. A method comprising: depositing a ferro stack over a surface of a substrate, the ferro stack including a bottom electrode layer electrically coupled to a bottom electrode contact extending through the substrate, a top electrode layer and ferroelectric layer there between; forming a hard-mask over the ferro stack; forming a ferroelectric capacitor, wherein forming the ferroelectric capacitor comprises: etching through the top electrode layer and at least partially through the ferroelectric layer to form a top electrode; forming a non-conductive barrier deposited directly on a top surface and sidewalls of the ferroelectric capacitor formed by etching through the top electrode layer and at least partially through the ferroelectric layer; forming a first patterned photoresist over a portion of the non-conductive barrier located on the top surface of the ferroelectric capacitor and not the sidewalls; etching the non-conductive barrier using the first patterned photoresist to expose a surface of a bottom electrode layer; and forming a bottom electrode, wherein forming the bottom electrode comprises etching the bottom electrode layer using the non-conductive barrier as a mask, and wherein conductive residues generated by the etching of the bottom electrode layer are electrically isolated from the top electrode by the non-conductive barrier that covers the sidewalls and the top surface of the ferroelectric capacitor, wherein the ferro stack further comprises a conductive oxygen (O