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

Claim 0:
1. A shower head structure, comprising:
a plate body having a first surface with a first zone and a second zone;
a plurality of first through holes in the first zone, each of the first through holes having a diameter uniform with others of the first through holes; and
a plurality of second through holes in the second zone;
wherein the first zone is in connection with the second zone, the first zone is at the central region of the plate body, the second zone is at the peripheral region of the plate body, the diameter of each of the first through holes is greater than a diameter of each of the second through holes, and the diameter of each of the second through holes is less than 2 times of a thickness of a Debye sheath layer;
wherein the plurality of second through holes are arranged in at least a first band and a second band concentrically, and the second through holes in the second band is staggerly disposed with respect to the second through holes in the first band;
wherein an amount of gas flow through the plurality of first through holes in the first zone per unit area is substantially equal to an amount of gas flow through the plurality of second through holes in the second zone per unit area; 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.