Patent ID: 11942419
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method comprising:
forming a conductive feature;
forming an etch stop layer over the conductive feature, wherein the forming the etch stop layer comprises:
depositing a first aluminum compound dielectric layer;
depositing a middle layer over the first aluminum compound dielectric layer; and
forming a second aluminum compound dielectric layer over the middle layer, wherein the forming the second aluminum compound dielectric layer comprises, after the middle layer is deposited, performing a treatment process on a top sub layer of the middle layer to form the second aluminum compound dielectric layer, wherein a bottom sub layer of the middle layer remains as the middle layer; and

forming a dielectric layer over the etch stop layer.