Patent ID: 11948969
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A semiconductor structure, comprising:
a substrate;
at least one dielectric layer over the substrate, the at least one dielectric layer including a step edge profile;
a capacitor structure disposed over the substrate, the capacitor structure comprising:
a bottom electrode covering the step edge profile of the at least one dielectric layer and having a first step profile substantially conformal to the step edge profile of the at least one dielectric layer;
a capacitor dielectric layer covering the bottom electrode and having a second step profile substantially conformal to the first step profile;
a top electrode covering the capacitor dielectric layer; and
an air gap in the capacitor structure; and

a cap barrier layer over a first portion of the capacitor structure,, wherein a second portion of the capacitor structure is disposed over the cap barrier layer, and the air gap is separated from the cap barrier layer.