Patent ID: 7592220
Filing Date: 2009-09-22
Classification: H01L

Abstract:
1. A method of forming a MIM capacitor and a contact pad, comprising; providing a substrate having a metal contact pad and a metal capacitor lower plate, the pad and plate each connected to an underlying metal; depositing a layer of etch stop material on the pad and plate; depositing a compound passivation layer over the layer of etch stop material, the compound passivation layer comprising a first layer of PEOX, a second layer of PESiN, and a third layer of PEOX; performing a first patterning of the compound passivation layer; performing a second patterning of the compound passivation layer and the layer of etch stop material, such that neither the first patterning nor the second patterning penetrates the etch stop material directly over the plate; depositing a layer of metal over the compound passivation layer; and patterning the metal layer, so that the etch stop material becomes a capacitor dielectric of an MIM capacitor.