Patent ID: 11973021
Assignee: VANGUARD INTERNATIONAL SEMICONDUCTOR CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. A method forming a semiconductor device, comprising:
forming a first metal layer on an inter-layer dielectric layer;
forming an inter-metal dielectric layer on the first metal layer, wherein steps of forming the inter-metal dielectric layer comprise:
conformally depositing a first dielectric layer on the first metal layer using a first deposition method, wherein the first dielectric layer has a stress value less than 0;
conformally depositing a second dielectric layer on the first dielectric layer using a second deposition method different from the first deposition method, wherein the second dielectric layer has a stress value greater than 0; and
depositing a third dielectric layer on the second dielectric layer using the first deposition method; and
forming a second metal layer on the inter-metal dielectric layer, wherein from a top view, the first metal layer and the second metal layer are formed with round corners.