Patent ID: 11901220
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A method for forming a semiconductor device, comprising:
forming a first sidewall structure by forming an L-shaped spacer on a sidewall of a first terminal of the semiconductor device;
forming a second sidewall structure by forming another spacer on a sidewall of a second terminal of the semiconductor device, wherein the first and second sidewall structures define boundaries of an opening;
depositing a first dielectric material, wherein:
a first portion of the first dielectric material is on a top portion of the first sidewall structure of the first terminal; and
a second portion of the first dielectric material is on a top portion of the second sidewall structure of the second terminal, wherein the first and second sidewall structures have different shapes;
depositing a second dielectric material, wherein:
a first portion of the second dielectric material is on the first portion of the first dielectric material; and
a second portion of the second dielectric material is on the second portion of the first dielectric material, wherein a pocket of air is entrapped in the opening surrounded by the second dielectric material, the first and second terminals, and the substrate; and

performing an oxygen treatment process on the deposited second dielectric material.