Patent ID: 11859284
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Surface technology, coating (Chemistry)
Classification: CPC C  B  H | IPC B  C

Claim 11:
12. A plasma processing apparatus, comprising: a chamber; a radio frequency (RF) power source coupled to the chamber; a shower head in the chamber and coupled to the RF power source, wherein the shower head is configured to provide a uniform amount of gas flow per unit area across the entire shower head; and a susceptor below the shower head, and a first surface of the shower head facing the susceptor; wherein the first surface of the shower head having a plurality of first through holes in a first zone, and a plurality of second through holes in a second zone, the first zone is surrounded by the second zone; wherein first diameters of the first through holes are substantially equal, second diameters of the second through holes are substantially equal, the first diameter is greater than the second diameter and the second diameter of each of the second through holes is less than 2 times of a thickness of a Debye sheath layer; wherein a percentage of a total area of the second through holes to a total area of the second zone at the first surface is substantially equal to a percentage of a total area of the first through holes to a total area of the first zone at the first surface; and wherein an area of the first through holes per unit area is equal to an area of the second through holes per unit area, and an amount of the first through holes per unit area is less than an amount of the second through holes per unit area.