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Chemical mechanical polishing stop layer for fully amorphous phase change memory pore cell










Image Number 4 for United States Patent #8012790.

A method for fabricating a phase change memory pore cell that includes forming a bottom electrode, forming a first dielectric layer on the bottom electrode, forming a sacrificial layer on the first dielectric layer, forming an isolation layer on the sacrificial layer, and forming a second dielectric layer on the isolation layer. The method further includes forming a via overlying the bottom electrode, the via extending to the sacrificial layer, etching through the sacrificial layer to the first dielectric layer to form a pore defined extending through the sacrificial layer and the first dielectric layer, depositing phase change material on the sacrificial layer and into the pore and removing the phase change material formed outside the pore, removing the sacrificial layer to expose the pore, the pore being vertically aligned, and forming a top electrode over the pore.








 
 
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