Patent ID: 9257496
Filing Date: 2016-02-09
CPC Classification: H01L

Claim Text:
1. A method of fabricating a capacitor structure, the method comprising steps of: providing a substrate; sequentially forming a first conductive layer, a first insulation layer, a second conductive layer and a second insulation layer over the substrate; forming a hard mask material layer on the second insulation layer, wherein the second insulation layer and the hard mask material layer have etching selectivity; patterning the hard mask material layer and the second insulation layer with a photo resist pattern, thereby forming a patterned hard mask layer and a patterned second insulation layer both having aligned edge sidewalls; removing the photo resist pattern; and defining the second conductive layer with the patterned hard mask layer and the patterned second insulation layer, thereby forming a first electrode of the capacitor structure, wherein in the step of defining the second conductive layer with the patterned hard mask layer and the patterned second insulation layer, the first insulation layer is used as a stop layer, and further comprising a step of removing a portion of the first insulation layer and a portion of the first conductive layer, thereby forming a dielectric structure and a second electrode.