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

Claim 0:
1. A method for forming a semiconductor device structure, comprising:
forming a device over a substrate;
forming a conductive feature over the device;
forming a first dielectric material over the device;
forming an opening in the first dielectric material to expose the conductive feature, wherein the opening is defined by a first sidewall of the first dielectric material;
forming a first spacer layer on the conductive feature and the first sidewall of the first dielectric material, wherein the first spacer layer comprises a first portion and a second portion, and the first portion is in contact with the first sidewall of the first dielectric material;
forming a sacrificial spacer layer on the first spacer layer;
removing a portion of the sacrificial spacer layer to expose the second portion of the first spacer layer, wherein a remaining portion of the sacrificial spacer layer is in contact with the first portion of the first spacer layer;
forming a second spacer layer on the exposed second portion of the first spacer layer and the remaining portion of the sacrificial spacer layer;
forming a conductive structure in the opening, wherein the conductive structure includes a second sidewall; and
removing the remaining portion of the sacrificial spacer layer to form an air gap, wherein the air gap surrounds the second sidewall of the conductive structure.