Patent ID: 11942324
Assignee: APPLIED MATERIALS, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 17:
18. A method of forming a contact trench in a dielectric layer of a semiconductor device, the method comprising:
disposing a photoresist layer on the dielectric layer;
performing a photolithography process including forming an aperture in the photoresist layer and directing an ion beam formed of reactive plasma ions into the aperture to form a trench in the dielectric layer;
performing an ion implantation process wherein an ion beam formed of ionized silicon is directed into the trench at an acute angle relative to a top surface of the dielectric layer to form an implantation layer in a sidewall of the trench, wherein the ion implantation process is performed at a temperature between 150 degrees Celsius and 500 degrees Celsius;
etching the implantation layer back to a depth where a concentration of silicon is higher than in other portions of the implantation layer;
depositing tungsten in the trench atop an underlying bottom metal layer, wherein the tungsten adheres to the sidewall; and
performing a chemical metal planarization process to remove excess tungsten overflowing from a top of the trench.