Patent ID: 11901220
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, comprising:
forming a first sidewall structure by forming an L-shaped spacer on a sidewall of a gate structure;
forming a second sidewall structure by forming another spacer on a sidewall of a source/drain structure, wherein:
the second sidewall structure is opposite to the first sidewall structure, and
the first and second sidewall structures are formed of different layers and define boundaries of an opening;

depositing a first dielectric material at a first deposition rate on top portions of the opening;
depositing a second dielectric material at a second deposition rate on the first dielectric material and on the first and second sidewall structures, wherein the second dielectric material and the first and second sidewall structures entrap a pocket of air; and
performing a treatment process on the second dielectric material.