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

Claim 4:
5. A shower head structure, comprising:
a plate body having a first surface and a second surface opposite to the first surface, the plate body comprising a first zone and a second zone, wherein gas flows through the plate body from the first surface toward the second surface during operation, the first zone is surrounded by the second zone, and an amount of gas flow through the plate body in the first zone per unit area is substantially equal to an amount of gas flow through the plate body in the second zone per unit area;
a plurality of first holes open at the first surface and in the first zone;
a plurality of second holes open at the first surface and in the second zone;
a plurality of third holes open at the second surface, in the first zone, and each of the third holes being in connection with each of the first holes;
a plurality of fourth holes open at the second surface, in the second zone, and each of the fourth holes being in connection with each of the second holes;
wherein a diameter of each of the second holes is less than 2 times of a thickness of a Debye sheath layer; and
wherein an area of the first holes per unit area at the first surface is equal to an area of the second holes per unit area at the first surface, and an amount of the first holes per unit area is less than an amount of the second holes per unit area.