Patent ID: 11948879
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A method for forming a semiconductor device structure, comprising:
forming a first dielectric material on a second dielectric material over a substrate;
forming an opening in the first dielectric material, wherein the opening is defined by a first sidewall of the first dielectric material, wherein a portion of the second dielectric material is exposed in the opening;
forming a first spacer layer on the first sidewall of the first dielectric material and a portion of the exposed portion of the second dielectric material, wherein the first spacer layer comprises a first portion and a second portion, the first portion is in contact with the first sidewall of the first dielectric material, and the second portion is in contact with the portion of the exposed portion of the second dielectric material;
forming a sacrificial spacer layer in contact with the first portion and the second portion of the first spacer layer;
forming a second spacer layer in contact with the sacrificial spacer layer and the second portion of the first spacer layer;
forming a conductive structure in the opening, wherein the conductive structure includes a second sidewall; and
removing the sacrificial spacer layer to form an air gap, wherein the air gap surrounds the second sidewall of the conductive structure.