Patent ID: 6902972
Filing Date: 2005-06-07
Classification: H01L

Abstract:
1. A method of forming a metal-insulator-metal capacitor on a substrate comprising: defining a first portion of one or more layers formed on the substrate; forming a first well in the first portion; applying a first diffusion barrier metal layer on the first well; forming a first conductive plug in the first well; forming an etch-stop layer on at least a portion of the first conductive plug, the etch-stop layer having a preselected dielectric constant and a predetermined geometry; defining a second portion of the one or more layers adjacent the etch-stop layer; forming a second well in the second portion to expose at least a portion of the etch-stop layer, applying a second diffusion barrier metal layer on the second well and on an exposed portion of the etch-stop layer; and forming a second conductive plug in the second well to provide the metal-insulator-metal capacitor with the first conductive plug through the etch-stop layer.