Patent ID: 11929283
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A semiconductor device, comprising:
a functional structure formed on a substrate;
a source/drain region adjacent to the functional structure;
a dielectric film stack over the functional structure and the substrate, the dielectric film stack comprising:
a first inter layer dielectric (ILD) over the substrate and the functional structure;
a barrier layer over the first ILD;
a second ILD over the barrier layer; and

a contact extending through the dielectric film stack and directly contacting the source/drain region, wherein
an upper portion of a contact sidewall extending through the second ILD has a first slope of from at least 45° to not more than 85°,
a lower portion of the contact sidewall extending through the first ILD has a second slope greater than the first slope, and
a transition from the first slope to the second slope occurs at a portion of the contact extending through the barrier layer.